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17 results on '"Zheng, Shuilin"'

11. Enhanced visible-light-assisted peroxymonosulfate activation over MnFe2O4 modified g-C3N4/diatomite composite for bisphenol A degradation

Author

Fang Yuan, Zheng Shuilin, Ye Tan, Ting Chen, Zhiming Sun, Xiaorui Liu, Xiangwei Zhang, and Chunquan Li

Subjects
Bisphenol A, Diatomite, Materials science, Mining engineering. Metallurgy, Composite number, TN1-997, Energy Engineering and Power Technology, Geotechnical Engineering and Engineering Geology, Photochemistry, chemistry.chemical_compound, chemistry, Geochemistry and Petrology, g-C3N4, Degradation (geology), Photocatalysis, Peroxymonosulfate, MnFe2O4, Visible spectrum
Abstract

The MnFe2O4/g-C3N4/diatomite composites (Mn/G/D) were prepared via a facile precipitation-calcination method in this study. The Mn/G/D possessed higher specific surface area, lower electron-hole pairs’ recombination rate, as well as wider and stronger visible light absorption capacity. Since the synergistic effect between g-C3N4 and MnFe2O4, the photogenerated electron could transfer from g-C3N4 to MnFe2O4, which could promote the migration of electrons as well as enhance the photocatalytic activity and peroxymonosulfate (PMS) activation efficiency. Mn/G/D-5% composite displayed the excellent degradation performance of bisphenol A (BPA) with the removal efficiency of 99.9% under PMS/Vis system, which was approximately 2.47 and 63.8 times as high as that of the Mn/G/D-5%/PMS and Mn/G/D-5%/Vis system, respectively. Moreover, negative electricity derived from diatomite surface also promoted the photogenerated carriers’ migration, and the degradation rate constant was around 2.4 times higher than that of MnFe2O4/g-C3N4 (Mn/G). In addition, quenching experiments showed that both radical pathway (h+, ·OH, ·O2− and SO4·−) and non-radical pathway (1O2) were responsible for the degradation of BPA.

Published
2021

16. Enhanced visible-light-assisted peroxymonosulfate activation over MnFe2O4modified g-C3N4/diatomite composite for bisphenol A degradation

Author

Zhang, Xiangwei, Li, Chunquan, Chen, Ting, Tan, Ye, Liu, Xiaorui, Yuan, Fang, Zheng, Shuilin, and Sun, Zhiming

Abstract

The MnFe2O4/g-C3N4/diatomite composites (Mn/G/D) were prepared via a facile precipitation-calcination method in this study. The Mn/G/D possessed higher specific surface area, lower electron-hole pairs’ recombination rate, as well as wider and stronger visible light absorption capacity. Since the synergistic effect between g-C3N4and MnFe2O4, the photogenerated electron could transfer from g-C3N4to MnFe2O4, which could promote the migration of electrons as well as enhance the photocatalytic activity and peroxymonosulfate (PMS) activation efficiency. Mn/G/D-5% composite displayed the excellent degradation performance of bisphenol A (BPA) with the removal efficiency of 99.9% under PMS/Vis system, which was approximately 2.47 and 63.8 times as high as that of the Mn/G/D-5%/PMS and Mn/G/D-5%/Vis system, respectively. Moreover, negative electricity derived from diatomite surface also promoted the photogenerated carriers’ migration, and the degradation rate constant was around 2.4 times higher than that of MnFe2O4/g-C3N4(Mn/G). In addition, quenching experiments showed that both radical pathway (h+, ·OH, ·O2−and SO4·−) and non-radical pathway (1O2) were responsible for the degradation of BPA.

Published
2021
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17. High Removal Efficiency of Diatomite-Based X Zeolite for Cu 2+ and Zn 2+.

Author

Yao, Guangyuan, Liu, Yuqiang, Zheng, Shuilin, and Xu, Ya

Subjects
ADSORPTION kinetics, ADSORPTION isotherms, LANGMUIR isotherms, ADSORPTION capacity, ION exchange (Chemistry), ZEOLITES
Abstract

Diatomite-based X zeolite was obtained and its crystallinity, morphology, and interface properties were investigated by XRD, BET, SEM, EDS, and XRF. The obtained X zeolite possessed a unique meso-microporous structure and showed good ion exchange properties for Cu2+ and Zn2+. The pseudo-second-order model and Langmuir isotherm model can best describe the adsorption kinetics and isotherms of Cu2+ and Zn2+, respectively. The maximal adsorption capacities of X zeolite for Cu2+ and Zn2+ were 146 and 195 mg/g at 323 K, respectively. Meanwhile, the adsorption process for Cu2+ and Zn2+ were chemical adsorption and ion exchange, respectively. Furthermore, the adsorption data turned out to be an endothermic and spontaneous process. Compared with other reported materials, the adsorption capacity of X zeolite synthesized from diatomite was among the highest. Therefore, it could be a promising adsorbent for the disposal of wastewater that contains metal ions. [ABSTRACT FROM AUTHOR]

Published
2021
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