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Adsorptive and Reductive Removal of Chlorophenol from Wastewater by Biomass-Derived Mesoporous Carbon-Supported Sulfide Nanoscale Zerovalent Iron

1
School of Environmental Science and Engineering, Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, China
2
State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
3
Yancheng Environmental Engineering Technology Research and Development Center, School of Environment, Tsinghua University, Yancheng 224051, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1786; https://doi.org/10.3390/nano9121786
Received: 1 December 2019 / Revised: 7 December 2019 / Accepted: 9 December 2019 / Published: 16 December 2019
Chlorinated compounds in a water environment pose serious threats to humanity. A nanoscale zerovalent iron (nZVI) has desirable properties for water dichlorination, but its reactivity is still limited by agglomeration and oxidation. In this study, the mesoporous carbon (MC) derived from biomass waste was prepared for immobilizing nZVI, and the [email protected] was further modified by sulfur ([email protected]) to relieve surface oxidation. The synergistic effect between nZVI and surface modification, the reaction conditions and the removal mechanism were investigated systematically. The characterization results showed nZVI was successfully loaded on the surface of MC, and the aggregation of nZVI was prevented. Moreover, sulfidation modification resulted in the formation of FeS on the surface of nZVI, which effectively alleviated surface oxidation of nZVI and promoted the electron transfer. Batch experiments demonstrated [email protected] had greatly enhanced reactivity towards 2,4,6-trichlorphenol (TCP) as compared to MC and nZVI, and the removal rate could reach 100%, which was mainly attributed to the significant synergistic effect of MC immobilization and sulfidation modification. Furthermore, the TCP removal process was well described by a Langmuir adsorption model and pseudo-second-order model. The possible mechanism for enhanced removal of TCP is the fast adsorption onto [email protected] and effective reduction by S-nZVI. Therefore, with excellent reducing activity and antioxidation, [email protected] has the potential as a pollutant treatment. View Full-Text
Keywords: porous carbon; zerovalent iron; biomass; dichlorination; adsorption porous carbon; zerovalent iron; biomass; dichlorination; adsorption
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Wang, H.; Cai, S.; Shan, L.; Zhuang, M.; Li, N.; Quan, G.; Yan, J. Adsorptive and Reductive Removal of Chlorophenol from Wastewater by Biomass-Derived Mesoporous Carbon-Supported Sulfide Nanoscale Zerovalent Iron. Nanomaterials 2019, 9, 1786.

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