One-step hydrothermal synthesis of Sn-dopedα-Fe2O3 nanoparticles for enhanced photocatalytic degradation of Congo red

Van Nang Lam; Thi Bich Vu; Quang Dat Do; Thi Thanh Xuan Le; Tien Dai Nguyen; T.-Thanh-Bao Nguyen; Hoang Tung Do; Thi Tu Oanh Nguyen

doi:10.1088/1674-4926/43/12/122001

Journals >Journal of Semiconductors >Volume 43 >Issue 12 >Page 122001 > Article

Journal of Semiconductors
Vol. 43, Issue 12, 122001 (2022)

One-step hydrothermal synthesis of Sn-dopedα-Fe₂O₃ nanoparticles for enhanced photocatalytic degradation of Congo red

Van Nang Lam^1、*, Thi Bich Vu^2、3, Quang Dat Do¹, Thi Thanh Xuan Le¹, Tien Dai Nguyen^2、3、**, T.-Thanh-Bao Nguyen⁴, Hoang Tung Do⁴, and Thi Tu Oanh Nguyen⁵

Author Affiliations

¹Department of Natural Sciences, Hoa Lu University, Ninh Nhat, Ninh Binh City, Viet Nam

²Institute of Theoretical and Applied Research, Duy Tan University, Hanoi 100000, Viet Nam

³Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam

⁴Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam

⁵Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, Hanoi, Vietnam

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DOI: 10.1088/1674-4926/43/12/122001 Cite this Article

Van Nang Lam, Thi Bich Vu, Quang Dat Do, Thi Thanh Xuan Le, Tien Dai Nguyen, T.-Thanh-Bao Nguyen, Hoang Tung Do, Thi Tu Oanh Nguyen. One-step hydrothermal synthesis of Sn-dopedα-Fe₂O₃ nanoparticles for enhanced photocatalytic degradation of Congo red[J]. Journal of Semiconductors, 2022, 43(12): 122001 Copy Citation Text

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(Color online) (a) XRD pattern ofα-Fe2O3 NPs samples. (b) Magnification of (104) planevs. Sn concentration. (c) 2θ position of (104) planevs. Sn concentration plot for changing Sn concentration.

Fig. 1. (Color online) (a) XRD pattern ofα-Fe₂O₃ NPs samples. (b) Magnification of (104) planevs. Sn concentration. (c) 2θ position of (104) planevs. Sn concentration plot for changing Sn concentration.

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SEM top–view images ofα-Fe2O3 NPs with varied Sn concentrations as 0% Sn (S1), 1.0% Sn (S2), 2.5% Sn (S3) and 4.0% Sn (S4) samples.

Fig. 2. SEM top–view images ofα-Fe₂O₃ NPs with varied Sn concentrations as 0% Sn (S1), 1.0% Sn (S2), 2.5% Sn (S3) and 4.0% Sn (S4) samples.

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Fig. 3. (Color online) (a) TEM image and average diameter size, (b) EDS spectrum and (c) FTIR spectrum of the pureα-Fe₂O₃ NPs (S1) and 2.5% Sn-α-Fe₂O₃ NPs (S3) samples and (d) Raman spectrum of S1–S4 samples.

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Fig. 4. (Color online) (a) The absorption spectra ofα-Fe₂O₃ NPs for varying Sn concentration (0%, 1.0%, 2.5% and 4.0%), and (αhν)²vs. energy plot for calculation of bandgap of different Sn–doping concentrationsα-Fe₂O₃ NPs for (b) 0% Sn (S1), (c) 1.0% Sn (S2), (d) 2.5% Sn (S3), (e) 4.0% Sn (S4) samples, respectively.

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Fig. 5. (Color online) UV–Vis absorption spectra of Congo red during different stage (at 15, and 30 min interval) of photocatalytic reaction ofα-Fe₂O₃ NPs with varied Sn doping concentration as (a) 0% Sn (S1), (b) 1.0% Sn (S2), (c) 2.5% Sn (S3) and (d) 4.0% Sn (S4) samples.

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Fig. 6. (Color online) (a) Effect of Sn-α-Fe₂O₃ NPs catalyst dosage on photodegradation efficiency of CR dye solution. (b) Plot of ln (C_o/C) as a function of irradiation time for photocatalysis of Congo red solution containing:α-Fe₂O₃ and Sn-dopedα-Fe₂O₃ NPs.

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Sample	Sn concentration(%)	Averagecrystallitesize (nm)	BETsurface area (m²/g)	E_g(eV)	Unit cell parameter (Å)		Congo red (mg/L)	Degradation efficiency (%)
Sample	Sn concentration(%)	Averagecrystallitesize (nm)	BETsurface area (m²/g)	E_g(eV)	a	c	Congo red (mg/L)	Degradation efficiency (%)
Sn-α-Fe₂O₃−S1	0.0	20.35	26.4656	2.57	5.0237	13.6904	10	84.6
Sn-α-Fe₂O₃−S2	1.0	19.82	27.0181	2.48	5.0271	13.7046	10	69.2
Sn-α-Fe₂O₃−S3	2.5	15.89	31.1234	2.46	5.0237	13.7346	10	97.8
Sn-α-Fe₂O₃−S4	4.0	21.74	25.9516	2.40	5.0351	13.7411	10	81.8

Table 0. The parameters of Sn doped toα-Fe₂O₃ nanoparticles and their degradation characteristics.

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Photocatalyst	Particle size(nm)	Dyes	Dopant concentration (%)	Weightcatalyst(mg)	Irradiationtime (min)	Degradationefficiency(%)	Ref.
Sn/α-Fe₂O₃ nanoparticles	41.4	Congo red	2.5	30	120	97.8	This work
Sn/α-Fe₂O₃ nanoparticles	12	Methylene blue	5.0	50	90	94.7	[10]
α-Fe₂O₃/ASCM nanoparticles	50	95	400	100	100	[6]
3,5 diacrylamidobenzoic acid based resin	−	Congo red	−	280	1440	92.03	[8]
Ni_1–xM_xFe₂O₃ nanosheets	20–24	Congo red	10	10	300	97	[49]
2, 2’-bpy/α-Fe₂O₃-S nanorods	80, 300	Bisphenol A	−	50	360	95.2	[12]
Ni/α-Fe₂O₃ nanoparticles	35	Rose bengal	4.0	50	90	80.0	[13]
γ-Fe₂O₃ nanoparticles	35	Methylene blue	−	25	40	98.9	[10]
α–Fe₂O₃ nanoparticles	27	Rose bengal	−	15	135	98.0	[30]

Table 0. Compression of photocatalyst characteristics ofα-Fe₂O₃ and other materials to varying organic dyes.

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