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Journal of Inorganic Materials
Contents
2023
Volume: 38 Issue 4
14 Article(s)
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Neuromorphic Devices for Brain-like Computing
Qing WAN
.
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 365 (2023)
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Research Progress of Flexible Neuromorphic Transistors
Yang YANG, Hangyuan CUI, Ying ZHU, Changjin WAN, and Qing WAN
In recent years, inspired by the unique operation mode of the human brain, emulation of the perception and computing functions of synapses and neurons by artificial neuromorphic devices has attracted more and more attention. So far, many researches have been reported about neuromorphic transistors (NMT), but most devic
In recent years, inspired by the unique operation mode of the human brain, emulation of the perception and computing functions of synapses and neurons by artificial neuromorphic devices has attracted more and more attention. So far, many researches have been reported about neuromorphic transistors (NMT), but most devices are fabricated on rigid substrates. The flexible neuromorphic transistors can not only realize signal transmission and training learning at the same time, but also carry out nonlinear spatio-temporal integration and cooperative regulation of multiple signals. It can also closely fit the soft human skin and withstand the high physiological strain of organs and tissues. More importantly, flexible neuromorphic transistors have unique advantages and application potential in detecting low amplitude signals at physiologically relevant time scales in biological environments due to their designable flexibility and excellent biocompatibility. Flexible neuromorphic transistors have been widely used in electronic skin, artificial vision system, intelligent wearable system, and other fields. At present, it is one of the most important tasks to develop low-power consumption, high-density integrated flexible neuromorphic transistors. In this paper, the research progress of NMT based on different flexible substrates is reviewed. In addition, the bright application prospect of flexible neuromorphic transistors is prospected. This review provides a reference for the development and application of flexible neuromorphic transistors in the future..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 367 (2023)
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Recent Progress in Optoelectronic Artificial Synapse Devices
Jianyu DU, and Chen GE
For the conventional von Neumann based vision systems, the sensing, memory, and processing units are separated. Shuttling of redundant data between separated image sensing, memory, and processing units causes a high latency and energy consumption. To break these limitations, the next-generation neuromorphic visual syst
For the conventional von Neumann based vision systems, the sensing, memory, and processing units are separated. Shuttling of redundant data between separated image sensing, memory, and processing units causes a high latency and energy consumption. To break these limitations, the next-generation neuromorphic visual systems, which integrate light information sensing, memory, and processing, can reduce the data transfer, thus improving their time and energy efficiencies. As the basis of the hardware-implementing of neuromorphic visual systems, optoelectronic artificial synapse devices have been extensively investigated in recent years. By integrating the functions of synaptic devices and light-sensing elements, the optoelectronic artificial synapse devices pave the way for constructing new neuromorphic vision systems with low latency, high energy efficiency and good reliability. Many materials are widely utilized for optoelectronic artificial synapse devices, and operation mechanisms of the present optoelectronic artificial synapse devices mainly include the ionization and dissociation of oxygen vacancy, the trapping/detrapping of photogenerated carriers, the light-induced phase change, and the interaction between light and ferroelectric materials. In this short review, the recent progresses in optoelectronic artificial synapse devices are introduced from the perspectives of their operation mechanisms. Besides, advantages and challenges of the devices are analyzed from the view of operation mechanisms. Finally, the advanced prospect and research aspect of optoelectronic artificial synapse devices are outlined for the application..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 378 (2023)
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Double Dielectric Layer Metal-oxide Memristor: Design and Applications
Junqi YOU, Ce LI, Dongliang YANG, and Linfeng SUN
Memristor, fusing the functions of storage and computing within a single device, is one of the core electronic components to solve the bottleneck of von Neumann architecture. With the unique volatile/non-volatile resistive switching characteristic, memristor can simulate the function of synapses/neurons in brain well.
Memristor, fusing the functions of storage and computing within a single device, is one of the core electronic components to solve the bottleneck of von Neumann architecture. With the unique volatile/non-volatile resistive switching characteristic, memristor can simulate the function of synapses/neurons in brain well. In addition, due to the compatibility with traditional complementary metal-oxide-semiconductor (CMOS) processes, metal-oxide-based memristors have received a lot of attention. In recent years, many kinds of metal-oxide memristors based on single dielectric layer have been proposed. However, there are still some problems such as the instability of switching voltage, fluctuation of high/low resistance state and poor endurance of memristive device. Thus, the researchers have successfully optimized the device performance by introducing the double dielectric layer into the metal-oxide memristors. In this article, we introduce the advantages of double dielectric layers-based metal-oxide memristors, and discuss their mechanism and design of double dielectric layers-based metal-oxide memristors. Eventually, we introduce their potential applications in neuromorphic computing. This review provides some enlightenment on how to design high-performance metal-oxide memristor based on double dielectric layers..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 387 (2023)
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Associative Learning with Oxide-based Electrolyte-gated Transistor Synapses
Renrui FANG, Kuan REN, Zeyu GUO, Han XU, Woyu ZHANG, Fei WANG, Peiwen ZHANG, Yue LI, and Dashan SHANG
The analog channel conductance modulation of electrolyte-gated transistors (EGTs) is a desirable property for the emulation of synaptic weight modulation and thus gives them great potential in neuromorphic computing systems. In this work, an all-solid-state electrochemical EGT was introduced with a low channel conducta
The analog channel conductance modulation of electrolyte-gated transistors (EGTs) is a desirable property for the emulation of synaptic weight modulation and thus gives them great potential in neuromorphic computing systems. In this work, an all-solid-state electrochemical EGT was introduced with a low channel conductance (~120 nS) using amorphous Nb
2
O
5
and Li-doped SiO
2
(Li
x
SiO
2
) as the channel and gate electrolyte materials, respectively. By adjusting the applied gate voltage pulse parameters, the reversable and nonvolatile modulation of channel conductance were achieved, which was ascribed to reversible intercalation/deintercalation of Li
+
ions into/from the Nb
2
O
5
lattice. Essential functionalities of synapses, such as the short-term plasticity (STP), long-term plasticity (LTP), and transformation from STP to LTP, were simulated successfully by conductive channel modulation of the EGTs. Based on these characteristics, a simple associative learning circuit was designed by parallel a resistor between the gate and the source terminals. The Pavlovian dog classical conditioning behavior was simulated based on associative learning circuit, where the resistor represented the unconditioned synapse and shared the gate voltage with EGT according to the proportion of its resistance, and the resistance between gate and source for negative feedback regulation of synaptic weights. These results demonstrate the potential of EGT for artificial synaptic devices and provide an insight into hardware implementation of neuromorphic computing systems..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 399 (2023)
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Effect of Plasma Treatment on the Long-term Plasticity of Synaptic Transistor
Haiyang QIU, Guangtan MIAO, Hui LI, Qi LUAN, Guoxia LIU, and Fukai SHAN
As the basic and essential unit of neuromorphic computing system, artificial synaptic devices exhibit great potential in accelerating the high-performance parallel computation, artificial intelligence, and adaptive learning. Among them, electrolyte-gated synaptic transistors (EGSTs) have received increasing attention a
As the basic and essential unit of neuromorphic computing system, artificial synaptic devices exhibit great potential in accelerating the high-performance parallel computation, artificial intelligence, and adaptive learning. Among them, electrolyte-gated synaptic transistors (EGSTs) have received increasing attention as the next generation neuromorphic devices owing to its controllable channel conductance. The devices exhibit the abilities of simulating the short-term plasticity (STP) and long-term plasticity (LTP) of the neural synapses. However, most of EGSTs exhibit short persistence for LTP and their channel conductance is difficult to be adjusted due to the rapid self-discharge of the electric double layer. In this work, the EGSTs based on water-induced In
2
O
3
as the channel and chitosan as gate electrolyte were constructed and the O
2
plasma treatments were performed. The formation of traps on the channel surface is caused by the O
2
plasma treatments, which leads to capturing hydrogen ions at interface of the electrolyte/channel layer, and the device performance exhibits an enlarged hysteresis window, so as to regulate LTP of EGSTs. Biological synaptic functions, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), STP, and LTP, were mimicked by electrochemical doping and electrostatic coupling effects. Meanwhile, based on the experimentally verified potentiation/depression characteristics of the EGSTs, a three-layer artificial neural network is applied for handwritten digit recognition, and simulation tests can obtain high recognition accuracy of 94.7%. These results reveal that surface plasma treatment is one of the key technologies to affect the device performance, which has great potential in regulating synaptic function of EGSTs..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 406 (2023)
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Intrinsically Stretchable Threshold Switching Memristor for Artificial Neuron Implementations
Yu TIAN, Xiaojian ZHU, Cui SUN, Xiaoyu YE, Huiyuan LIU, and Runwei LI
The exploration of flexible electronic devices with information processing functions of biological neurons is of great significance for the development of intelligent wearable technologies. Due to lack of inherent mechanical flexibility, conventional threshold-switching memristor based on rigid materials that can imple
The exploration of flexible electronic devices with information processing functions of biological neurons is of great significance for the development of intelligent wearable technologies. Due to lack of inherent mechanical flexibility, conventional threshold-switching memristor based on rigid materials that can implement the computing functions of biological neurons is difficult to fulfill the requirements for potential applications in the future. In this work, an intrinsically stretchable threshold-switching memristor was prepared by using silver nanowire-polyurethane composite as the dielectric layer and liquid metal as the electrodes, respectively. Under application of a sweeping voltage, the device exhibited reliable threshold switching characteristics, which was switched from the high resistance state (HRS) to the low resistance state (LRS) during device programming and spontaneously relaxed to the HRS upon voltage application. Further analysis shows that the underlying mechanism can be attributed to the dynamic formation and rupture of discontinuous silver conductive filaments formed between silver nanowires. In the pulse programming mode, memristor device is able to emulate the integration and firing characteristics of biological neurons, suggesting its great potential as an artificial neuron. Moreover, the pulse amplitude and pulse interval modulated neuronal spiking behaviors are successfully replicated using such devices. Under 20% tensile strain, the threshold-switching memristor shows negligible changes in the operating parameters during device switching and neuronal function implementations, suggesting its excellent mechanical flexibility and stability. This work provides important guidelines for the development of high-performance stretchable artificial neuronal devices and next-generation intelligent wearable systems..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 413 (2023)
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Gelatin/Carboxylated Chitosan Gated Oxide Neuromorphic Transistor
Xinli CHEN, Yan LI, Weisheng WANG, Zhiwen SHI, and Liqiang ZHU
Mimicking of brain perceptual processing mode is of great importance for the design of bionic intelligent perceptual system. On the meantime, adopting functional materials with biocompatibility and biodegradability to construct environment-friendly neuromorphic devices is also an important aspect for synaptic electroni
Mimicking of brain perceptual processing mode is of great importance for the design of bionic intelligent perceptual system. On the meantime, adopting functional materials with biocompatibility and biodegradability to construct environment-friendly neuromorphic devices is also an important aspect for synaptic electronics. Here, gelatin/carboxylated chitosan (GEL/C-CS) composite electrolyte film was adopted as gate dielectrics in oxide neuromorphic transistors. Synaptic plasticities, including excitory post synaptic current and paired pulse facilitation, were mimicked on the oxide neuromorphic transistor under different humidities. A quantitative processing method for tactile recognition of objects was proposed based on the spike number dependent synaptic plasticity. An artificial neural network was built in further. Recognition accuracy of MNIST handwritten digits is above 90%. Data from above evaluation show that the proposed GEL/C-CS gated neuromorphic device has a promising application potential in the design of bionic intelligent perceptual systems and brain inspired neuromorphic systems..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 421 (2023)
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Bionic Research on Multistage Pain Sensitization Based on Ionic Oxide Transistor Array
Yanran LI, Dingdong XIE, and Jie JIANG
Multistage pain perception is of great significance for surviving the outside harmful stimuli for organisms. In this work, using a sodium alginate biopolymer electrolyte as neurotransmitter layer, a 5×5 array of junctionless transistoris successfully fabricated for pain perception. The device operates well at low
Multistage pain perception is of great significance for surviving the outside harmful stimuli for organisms. In this work, using a sodium alginate biopolymer electrolyte as neurotransmitter layer, a 5×5 array of junctionless transistoris successfully fabricated for pain perception. The device operates well at low voltage (2 V) with a large current on-off ratio (>10
4
) and on-state current (>10 μA). This coplanar-gate array can not only emulate the important functions of synapses, such as excitatory postsynaptic current, paired-pulse facilitation, and dynamic filtering, but also successfully mimic pain-perception and sensitization abilities of the artificial nociceptor network. Furthermore, this work also successfully emulates the multistage spatio-temporal sensitization in the nociceptor network. Construction of this kind of network system provides a new way for the application of the next-generation neuromorphic brain-like system..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 429 (2023)
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Defect-induced Analogue Resistive Switching Behavior in FeO
x
-based Memristor and Synaptic Paired-pulse Facilitation Feature
Tongyu WANG, Haofeng RAN, and Guangdong ZHOU
A memristor with analogue resistive switching (RS) memory behaviors could provide enough conductance states for high-efficiency neuromorphic computing because this type RS memory feature can avoid conductance clamping, steeply change, and computing invalidation. Simulating the behavior of biological synapses under stim
A memristor with analogue resistive switching (RS) memory behaviors could provide enough conductance states for high-efficiency neuromorphic computing because this type RS memory feature can avoid conductance clamping, steeply change, and computing invalidation. Simulating the behavior of biological synapses under stimulus pulse can better reveal the bionic characteristic mechanism of electronic devices and provide support for high performance neuromorphic computation. Synaptic paired-pulse facilitation (PPF) is an important characteristic of biological synapses, reflecting the facilitation and adaptation process under external stimuli, which is crucial to reveal the working mechanism of neurons. A memristor with the structure of the Ag/FeO
x
/ITO was prepared by RF magnetron sputtering, which was designed by energy band engineering for the PPF demonstration. Experimental measurement of the electric properties illustrates that the developed memristor displays an excellent asymptotic nonlinear resistance switching behaviors, which is so called analogue RS memory behavior. Importantly, this developed memristor presents this analogue RS memory behavior during 3000
I-V
sweepings, provides dissociable 16 conductance states that could be well maintained for 10
4
s, illustrating that these available conductance states are nonvolatile. Based on the energy band structure and oxygen vacancy (V
O
) defects, a physical mechanism, which involved trap sites softly filled by the injection electron, electron tunneling between the potential barrier built by the contact of Ag/FeO
x
and FeO
x
/ITO, and the V
O
migration that accompanied a volatile feature to some extent, is proposed to comprehend the observed analogue RS memory behaviors. According to this mechanism, a typical PPF feature is obtained after modulating the voltage pulse width and amplitude. The observed analogue RS memory behaviors and PPF behaviors show a promising potential and advantage in neuromorphic computing..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 437 (2023)
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Dual-gate IGZO-based Neuromorphic Transistors with Stacked Al
2
O
3
/Chitosan Gate Dielectrics
Jingyu WANG, Changjin WAN, and Qing WAN
Indium-gallium-zinc-oxide (IGZO)-based electric-double-layer (EDL) transistors have great applications for neuromorphic perception and computing systems because of their low processing temperature, high homogeneity, and plentiful ionic dynamics. However, IGZO-based EDL transistors have problems of high leakage current
Indium-gallium-zinc-oxide (IGZO)-based electric-double-layer (EDL) transistors have great applications for neuromorphic perception and computing systems because of their low processing temperature, high homogeneity, and plentiful ionic dynamics. However, IGZO-based EDL transistors have problems of high leakage current (>10 nA), high energy consumption and abnormal current spikes, which are the main obstacles to the development of neuromorphic computing systems based on such devices. In this work, a novel IGZO neuromorphic transistor with Al
2
O
3
/chitosan stacked gate dielectric was proposed. Compared with the monolayer chitosan gate dielectric transistor, the device with Al
2
O
3
/chitosan layer showed low subthreshold swing of 78.3 mV/decade, a low gate leakage current of 1.3 nA (reduced by about 98%), a large hysteresis window of 3.73 V (increased by about 3.4 times), a low excitable postsynaptic current of 0.86 nA (decreased by about 97%) and an energy consumption of 1.7 pJ for a spike event (0.5 V, 20 ms). Additionally, the emulation of spiking synaptic function and the synergistically modulation of the channel current were also realized, and the abnormal current spike caused by high leakage in synaptic plasticity simulation was also effectively avoided. The results suggest that the inserting of high-k dielectric layer can effectively improve the leakage current, energy consumption and performance of neuromorphic devices, which has substantial value for future ultra-low energy consumption neuromorphic perception and computing systems..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 445 (2023)
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RESEARCH LETTER
Fabrication and Microstructure of Gd
2
O
2
S:Tb Scintillation Ceramics from Water-bath Synthesized Nano-powders: Influence of H
2
SO
4
/Gd
2
O
3
Molar Ratio
Junlin WU, Jiyang DING, Xinyou HUANG, Danyang ZHU, Dong HUANG, Zhengfa DAI, Wenqin YANG, Xingfen JIANG, Jianrong ZHOU, Zhijia SUN, and Jiang LI
The Gd2O2S:Tb scintillation ceramics is extensively used for neutron radiography and industrial non-destructive testing due to its bright green emission, high intrinsic conversion efficiency and high thermal neutron capture cross-section. However, the existence of Gd2O3 secondary phase in Gd2O2S ceramics impedes the sc
The Gd
2
O
2
S:Tb scintillation ceramics is extensively used for neutron radiography and industrial non-destructive testing due to its bright green emission, high intrinsic conversion efficiency and high thermal neutron capture cross-section. However, the existence of Gd
2
O
3
secondary phase in Gd
2
O
2
S ceramics impedes the scintillation property. In this work, The Gd
2
O
2
S:Tb precursors were synthesized in water-bath with H
2
SO
4
and Gd
2
O
3
as starting materials. Molar ratio of H
2
SO
4
to Gd
2
O
3
defined as
n
was adjusted to synthesize the precursors., which influence on the properties of the precursors and powders was studied. Chemical composition of the precursors changes with the increase of
n
, from 2Gd
2
O
3
·Gd
2
(SO
4
)
3
·
x
H
2
O (
n
<2.00) to Gd
2
O
3
·2Gd
2
(SO
4
)
3
·
x
H
2
O (2.25≤
n
≤2.75), and to Gd
2
(SO
4
)
3
·8H
2
O (
n
=3.00). After being calcined and reduced, all the powders form pure Gd
2
O
2
S phase. Morphology of the Gd
2
O
2
S:Tb powders is closely related to the phase composition of the precursor. Increasement of the XEL intensity shows two stages with
n
increase, corresponding to the phase transition of the precursor, respectively. The Gd
2
O
2
S:Tb scintillation ceramics were therefore fabricated by vacuum pre-sintering and HIP post-treatment. The ceramics were fabricated from the powders prepared with different
n
, achieving high relative density and XEL intensity, except the ceramics fabricated from the powders prepared with the
n
=2.00, 2.25, 2.50. The increase of
n
is beneficial to the removal of the Gd
2
O
3
secondary phase from the Gd
2
O
2
S:Tb ceramics. This work provides a way for eliminating the secondary phase in Gd
2
O
2
S:Tb scintillation ceramics..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 452 (2023)
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Microwave Drying of Spontaneous-Coagulation-Cast Wet Alumina Green Body
Wenlong LIU, Jin ZHAO, Juan LIU, Xiaojian MAO, Jian ZHANG, and Shiwei WANG
To solve moisture gradients in the conventional drying with controlled temperature and relative humidity, microwave heating was employed to dry wet alumina green bodies shaped by spontaneous coagulation casting. The weight loss, linear shrinkage, surface temperature, and moisture distribution of the green bodies by con
To solve moisture gradients in the conventional drying with controlled temperature and relative humidity, microwave heating was employed to dry wet alumina green bodies shaped by spontaneous coagulation casting. The weight loss, linear shrinkage, surface temperature, and moisture distribution of the green bodies by conventional drying (temperature: 40 ℃; humidity: 60%) and microwave drying were investigated. The time for no further weight loss and shrinkage of the body by microwave drying (power: 250 W) were respectively shortened to 1/6.8 and 1/6 of those by conventional drying. Surface temperature of the green body during the microwave drying increased firstly and then decreased with time, which was strongly correlated with the internal moisture, while the temperature in the conventional drying keeping at 40 ℃. Low-field nuclear-magnetic-resonance (NMR) imaging revealed that the moisture distribution in the green bodies dried by microwave drying was more uniform than that by conventional drying, indicating that drying stress in the former was lower than that in the latter. After sintering at 1550 ℃ for 6 h, alumina ceramics from microwave drying had a higher flexural strength with a smaller deviation than that from conventional drying..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 461 (2023)
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Enhanced Degradation of Methyl Orange with CoFe
2
O
4
@Zeolite Catalyst as Peroxymonosulfate Activator: Performance and Mechanism
Lei WANG, Jianjun LI, Jun NING, Tianyu HU, Hongyang WANG, Zhanqun ZHANG, and Linxin WU
CoFe2O4@zeolite (CFZ) was prepared by using a co-precipitation hydrothermal method and used for synthetic dyes degradation by activating peroxymonosulfate (PMS). Comprehensive characterizations suggest that CoFe2O4 nanoparticles composing porous shell layer is uniformly covered on Na-A zeolite. The specific surface are
CoFe
2
O
4
@zeolite (CFZ) was prepared by using a co-precipitation hydrothermal method and used for synthetic dyes degradation by activating peroxymonosulfate (PMS). Comprehensive characterizations suggest that CoFe
2
O
4
nanoparticles composing porous shell layer is uniformly covered on Na-A zeolite. The specific surface area of CFZ is 107.06 m
2
/g, three times that of the original zeolite. Since CFZ has a saturation magnetization of 29.0 A·m
2
·kg
-1
, it could be separated efficiently by magnetic separation. Catalytic degradation experiments indicate that the removal of methyl orange (MO) in the CFZ/PMS system is much higher than that using CFZ or PMS alone. Under the optimum condition ([MO]=50 mg/L, [PMS]=1.0 mmol/L, 0.2 g/L CFZ, pH 8 and
T
=25 ℃), MO removal efficiency is up to 97.1%. Effect of various factors, including pH, PMS and CFZ dosage, MO concentration and presence of coexisting anions, on the catalytic performance of CFZ is carefully studied. Reactive oxygen species quenching experiments suggest that
1
O
2
and O
2
•-
play a dominant role in the degradation process. CFZ shows excellent recycling performance that the MO removal is declined by only 2.4% after 5 cycles. Catalytic degradation mechanism of the CFZ/PMS system is explored in detail..
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Journal of Inorganic Materials
Publication Date: Apr. 20, 2023
Vol. 38, Issue 4, 469 (2023)
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