Enhanced hexavalent chromium removal performance and stabilization by magnetic iron nanoparticles assisted biochar in aqueous solution: Mechanisms and application potential

Chemosphere
Shishu ZhuFang Ma

Abstract

The superiority of the nanoscale zero valent iron (nZVI) assisted biochar (BC) composites compared to traditional nZVI and its application feasibility are still unclear. This study aimed to provide valuable information for practical application. Firstly, the Fe/BC mass ratio of 2:1 during the preparation of nZVI-BC was proved obtaining the complete Cr6+ removal. Then, results revealed that the initial pH value tuned Cr6+ removal performance via varying existing Cr6+ species, surface charge, and chemical states of iron nanoparticles (NPs). Improvement of colloidal stabilization and positive surface charge attributed to enhancement of Cr6+ removal of nZVI-BC. The Cr6+ removal process was well described using pseudo-second-order kinetic. By Langmuir isotherm model, the maximum removal capacity (58.82 mg g-1) was determined. Moreover, the multiple evidences (XRD, XPS, FTIR, and TEM results) explained the mechanisms of Cr6+ removal (i.e. electrostatic force, complexes, metal reduction, and precipitates on the edges). Little inhibitory effect of coexisting anions (SO42-, PO43-, and NO3-) and well regeneration ability (82.2% removal efficiency after five cycles using acid washing), along with well Cr6+ removal efficiencies of real con...Continue Reading

Citations

Dec 19, 2019·Environmental Science and Pollution Research International·Ting YangYongming Luo
Jan 10, 2020·Environmental Science and Pollution Research International·Luyao QinAijun Lin
Dec 5, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Hualin ChenYufeng Wang
Nov 2, 2019·Environmental Geochemistry and Health·Shaopan XiaHailong Wang
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Jan 9, 2021·Environmental Science and Pollution Research International·Shubhangi MadanManuel Jorge Soares
Nov 26, 2018·The Science of the Total Environment·Hanna FrickKristian K Brandt
Mar 28, 2021·International Journal of Biological Macromolecules·Jéssica S MarcianoDerval S Rosa

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