烟气脱硫
亚硫酸盐
六价铬
铬
化学
催化作用
吸附
硫黄
废水
氧化还原
生物炭
无机化学
废物管理
有机化学
热解
工程类
作者
Tieyue Qi,Shuo Zhang,Jingzhao Zhang,Tong Li,Lei Xing,Zhimo Fang,Shanlong An,Zhongfei Xu,Huining Xiao,Shihan Zhang
标识
DOI:10.1021/acs.est.2c09606
摘要
Hexavalent chromium (Cr(VI)) is a highly toxic substance in wastewater, triggering grievous detriment to aquatic life and human health. Magnesium sulfite is spawned along with the desulfurization process in coal-fired power plants, which is usually disposed of as solid waste. Here, a "waste control by waste" method was proposed upon the redox of Cr(VI)-sulfite, in which highly toxic Cr(VI) is detoxicated and sequent enriched on a novel biochar-induced cobalt-based silica composite (BISC) due to the forced electron transfer from chromium to surface hydroxyl. The immobilized Cr on BISC gave rise to the reconstruction of catalytic active sites "Cr-O-Co", which further enhance its performance in sulfite oxidation by elevating O2 adsorption. As a result, the sulfite oxidation rate increased by 10 times compared with the non-catalysis benchmark together with the maximum chromium adsorption capacity being 120.3 mg/g. Therefore, this study provides a promising strategy to simultaneously control highly toxic Cr(VI) and sulfite, achieving high-grade sulfur resource recovery for wet magnesia desulfurization.
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