The contribution of lignocellulosic constituents to Cr(VI) reduction capacity of biochar-supported zerovalent iron

Min Zhou; Xianni Yang; Renhua Sun; Xiaozhi Wang; Weiqin Yin; Shengsen Wang; Jun Wang

doi:10.1016/j.chemosphere.2020.127871

The contribution of lignocellulosic constituents to Cr(VI) reduction capacity of biochar-supported zerovalent iron

Chemosphere. 2021 Jan:263:127871. doi: 10.1016/j.chemosphere.2020.127871. Epub 2020 Aug 18.

Authors

Min Zhou¹, Xianni Yang¹, Renhua Sun², Xiaozhi Wang³, Weiqin Yin¹, Shengsen Wang⁴, Jun Wang⁵

Affiliations

¹ College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, PR China.
² Agricultural Ecology and Resource Protection Station, Ministry of Agriculture and Rural Affairs, Beijing, 010023, PR China.
³ College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, PR China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, 225127, Jiangsu, PR China.
⁴ College of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, PR China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, PR China; Joint International Research Laboratory of Agriculture and Agri-Product Safety of Ministry of Education of China, Yangzhou University, Yangzhou, 225127, Jiangsu, PR China. Electronic address: wangss@yzu.edu.cn.
⁵ College of Resources and Environment, Shandong Agricultural University, Taian, 271018, PR China. Electronic address: jwang@sdau.edu.cn.

PMID: 33297005
DOI: 10.1016/j.chemosphere.2020.127871

Abstract

Biochars (BCs) derived from individual and blending lignocellulosic constituents were prepared to harbor zerovalent iron (ZVI/BC) in an effort to discriminate significance of each constituent or combination in ZVI/BC for Cr(VI) removal. BCs and ZVI/BC were characterized by TGA/GSC, XRD, Raman and BET analyses. Cellulose (BC_C) and hemicellulose (BC_H)-derived BCs has greater C content, H/C ratio, surface area and mass loss than BCs derived from lignin or lignin-containing biopolymer blends (BC_LX). As per sorption and XPS analysis, ZVI/BC demonstrated greater Cr(VI) removal capacity than respective BCs, in which reduction accounted for over 77% Cr(VI) detoxification. Cr(VI) reduction by ZVI harbored by BC_C and BC_H was 19.72-16.54 g kg^-1, compared to 5.97-4.26 g kg^-1 for BC_LX. ZVI/BC prepared by three-biopolymer blends with (12.63 g kg^-1) or without (12.32 g kg^-1) mineral approximated pinewood-BC (BC_P) (13.02 g kg^-1) for Cr(VI) reduction, suggesting minerals are not important constituent. Tafel analysis showed BC_C and BC_H, with lower I_D/I_G ratio owing to greater graphitization, were more conducible to transfer electron of ZVI in Cr(VI) reduction than BC_LX. Thus, cellulose, hemicellulose and lignin can offer a good prediction of property of natural biomass, in which BC_C and BC_H favor electron transfer of ZVI but BC_L is not electroactive.

Keywords: Biochar; Biomass; Electron transfer; Heavy metals; Soil and water remediation; Zerovalent iron.

MeSH terms

Charcoal
Chromium / analysis
Iron*
Lignin
Water Pollutants, Chemical* / analysis

Substances

Water Pollutants, Chemical
biochar
Chromium
lignocellulose
Charcoal
chromium hexavalent ion
Lignin
Iron