Journal of Inorganic Materials, Volume. 34, Issue 6, 653(2019)
Figures & Tables(8)
1. BCRM and bubble generation at (a) different holding time and (b) melting temperatures, and (c) thermogravimetric analysis of batch
2. (a) Accumulative release concentration and (b) accumulative release rate of boron from the BCRM in deionized water under different temperatures
3. (a) XRD patterns, (b) FT-IR spectra, and (c, d) XPS survey spectra of the BCRM before and after controlled-release
Table 1. Chemical components and their corresponding composition per 80 g BCRM
View tableView in ArticleTable 1. Chemical components and their corresponding composition per 80 g BCRM
Components Na2B4O7·10H2O H3BO3 SiO2 Weight/g 33.02 32.16 14.82
Table 2. Values of diffusional exponent,
n , for polymer matrices with cylinder in Korsmeyer-Peppas model[18]View tableView in ArticleTable 2. Values of diffusional exponent,
n , for polymer matrices with cylinder in Korsmeyer-Peppas model[18]Release exponent, n Release mechanism Cylinder 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 3. The test and calculation data of samples under various process parameters
View tableView in ArticleTable 3. The test and calculation data of samples under various process parameters
Conditions Parameters Boron concentration /(mg·L-1) Recovery/% Theoretical values of B2O3 /wt% Test values of B2O3 /wt% B2O3 volatilization/% 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 4. Characteristic vibrations reflected by infrared absorption spectrum of each group in the BCRM before and after controlled-release
View tableView in ArticleTable 4. Characteristic vibrations reflected by infrared absorption spectrum of each group in the BCRM before and after controlled-release
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 5. Release kinetics model fitting of the BCRM at different temperatures
View tableView in ArticleTable 5. Release kinetics model fitting of the BCRM at different temperatures
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 - -
Tools
Get Citation
Copy Citation Text
Chang-Xing HUANG, Jun CUI, Yuan-Sheng PEI.
Paper Information
Category: RESEARCH PAPER
Received: Aug. 2, 2018
Accepted: --
Published Online: Sep. 24, 2021
The Author Email: PEI Yuan-Sheng (yspei@bnu.edu.cn)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20