B2O3-SiO2-Na2O Controlled-release Material: Synthetic Parameters Optimization and Release Mechanisms Exploration

Chang-Xing HUANG; Jun CUI; Yuan-Sheng PEI

doi:10.15541/jim20180359

Journals >Journal of Inorganic Materials >Volume 34 >Issue 6 >Page 653 > Article

Journal of Inorganic Materials
Vol. 34, Issue 6, 653 (2019)

B₂O₃-SiO₂-Na₂O Controlled-release Material: Synthetic Parameters Optimization and Release Mechanisms Exploration

Chang-Xing HUANG, Jun CUI, and Yuan-Sheng PEI^*

Author Affiliations

Key Laboratory of Water and Sediment Sciences, School of Environment, Beijing Normal University, Beijing 100875, China

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DOI: 10.15541/jim20180359 Cite this Article

Chang-Xing HUANG, Jun CUI, Yuan-Sheng PEI. B₂O₃-SiO₂-Na₂O Controlled-release Material: Synthetic Parameters Optimization and Release Mechanisms Exploration[J]. Journal of Inorganic Materials, 2019, 34(6): 653 Copy Citation Text

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1. BCRM and bubble generation at (a) different holding time and (b) melting temperatures, and (c) thermogravimetric analysis of batch

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(a) Accumulative release concentration and (b) accumulative release rate of boron from the BCRM in deionized water under different temperatures

2. (a) Accumulative release concentration and (b) accumulative release rate of boron from the BCRM in deionized water under different temperatures

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3. (a) XRD patterns, (b) FT-IR spectra, and (c, d) XPS survey spectra of the BCRM before and after controlled-release

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Components	Na₂B₄O₇·10H₂O	H₃BO₃	SiO₂
Weight/g	33.02	32.16	14.82

Table 1. Chemical components and their corresponding composition per 80 g BCRM

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Release exponent, n	Release mechanism
Cylinder	Release mechanism
n ≤ 0.45	Fickian diffusion
0.45 < n < 0.89	Non-Fickian diffusion
n = 0.89	Case II transport
n > 0.89	Super Case II transport

Table 2. Values of diffusional exponent, n, for polymer matrices with cylinder in Korsmeyer-Peppas model^[18]

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Conditions	Parameters	Boron concentration/(mg·L^-1)	Recovery/%	Theoretical values of B₂O₃/wt%	Test values of B₂O₃/wt%	B₂O₃volatilization/%
Heating rate/(℃•min^-1)	4	91.728	95.02-102.32	60	59.08	1.53
	6	90.657			58.39	2.68
	8	89.278			57.50	4.17
	10	87.638			56.44	5.93
Holding time/h	0.5	92.372	95.41-104.29	60	59.49	0.85
	1	91.808			59.13	1.45
	1.5	90.491			58.28	2.87
	2	90.442			58.25	2.92
Melting temperature/℃	1025	90.612	100.27-105.42	60	58.36	2.73
	1050	90.144			58.06	3.23
	1075	88.986			57.31	4.48
Initial temperature/℃	300	90.404	100.63-106.42	60	58.22	2.97
	800	91.300			58.80	2.00
	1050	92.148			59.35	1.08

Table 3. The test and calculation data of samples under various process parameters

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Before controlled-release		After controlled-release
Wavenumber/cm^-1	Corresponding characteristic vibrations ascription	Wavenumber/cm^-1	Corresponding characteristic vibrations ascription
463.46	Si-O-Si bending vibrations	466.53	Si-O-Si bending vibrations
694.02	[BO₃] bending vibrations	798.51	O-Si-O stretching vibrations
1061.16	Si-O-Si asymmetric stretching vibrations	1083.89	Si-O-Si asymmetric stretching vibrations
1268.39	[BO₃] stretching vibrations	1637.42	H₂O
1392.97	[BO₃] antisymmetry stretching vibrations	3448.34	H-O stretching vibrations
3448.20	H-O stretching vibrations

Table 4. Characteristic vibrations reflected by infrared absorption spectrum of each group in the BCRM before and after controlled-release

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Temperature/℃	Models	R²
30	${{M}_{t}}/{{M}_{\infty }}=10.06{{t}^{0.97}}$	0.9959
35	${{M}_{t}}/{{M}_{\infty }}=14.33{{t}^{0.95}}$	0.9935
40	${{M}_{t}}/{{M}_{\infty }}=23.75{{t}^{0.77}}$	0.9574
45	-	-

Table 5. Release kinetics model fitting of the BCRM at different temperatures

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