零价铁
木质素
化学
半纤维素
纤维素
核化学
生物炭
生物高聚物
吸附
吸附
塔菲尔方程
热解
有机化学
物理化学
聚合物
电化学
电极
作者
Min Zhou,Xianni Yang,Renhua Sun,Xiaozhi Wang,Wang Yin,Shengsen Wang,Jun Wang
出处
期刊:Chemosphere
[Elsevier]
日期:2021-01-01
卷期号:263: 127871-127871
被引量:34
标识
DOI:10.1016/j.chemosphere.2020.127871
摘要
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 (BCC) and hemicellulose (BCH)-derived BCs has greater C content, H/C ratio, surface area and mass loss than BCs derived from lignin or lignin-containing biopolymer blends (BCLX). 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 BCC and BCH was 19.72–16.54 g kg−1, compared to 5.97–4.26 g kg−1 for BCLX. ZVI/BC prepared by three-biopolymer blends with (12.63 g kg−1) or without (12.32 g kg−1) mineral approximated pinewood-BC (BCP) (13.02 g kg−1) for Cr(VI) reduction, suggesting minerals are not important constituent. Tafel analysis showed BCC and BCH, with lower ID/IG ratio owing to greater graphitization, were more conducible to transfer electron of ZVI in Cr(VI) reduction than BCLX. Thus, cellulose, hemicellulose and lignin can offer a good prediction of property of natural biomass, in which BCC and BCH favor electron transfer of ZVI but BCL is not electroactive.
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