A novel MnOx-impregnated on peanut shells derived biochar for high adsorption performance of Pb(II) and Cd(II): Behavior and mechanism

生物炭 材料科学 吸附 弗伦德利希方程 原材料 水溶液中的金属离子 降水 化学工程 离子交换 金属 选择性 工业废水处理 废水 核化学 环境污染 离子 有机化学 冶金 废物管理 化学 催化作用 热解 物理 气象学 工程类 环境保护 环境科学
作者
Xueqiang Liu,Diandi Li,Jiguang Li,Jianle Wang,Shujie Liang,Hong Deng
出处
期刊:Surfaces and Interfaces [Elsevier BV]
卷期号:34: 102323-102323 被引量:24
标识
DOI:10.1016/j.surfin.2022.102323
摘要

Heavy metal ion pollution (e.g., Hg, Pb, Cr, Cd) that has a great threat to human health is a global concern, because of their great toxicity (e.g., carcinogenicity and mutagenicity). Therefore, it is necessary to find an economical and efficient technology to remove metal. In recent years, modified biochar plays an important role in the removal of heavy metal. However, most of the biochar modification methods rely on high temperature and long time, which limits their application in practical engineering. In this study, we firstly synthesized HMBC (MnOX-OBC, peanut shells as raw materials) using H2O2-NaOH method, where the materials only need to be modified for 10 min at ambient temperature to obtain high adsorption performance. The maximum Pb(Ⅱ) and Cd(Ⅱ) adsorption capacities of HMBC were 164.59 mg g−1 and 36.77 mg g−1, respectively, which were 7.2 times and 5.6 times that of the unmodified PBC (peanut shells derived biochar), and the main adsorption mechanisms were complexation, ion exchange, cation-π interaction and precipitation. The adsorption process of lead and cadmium by HMBC was more consistent with the Freundlich model and Pseudo-second-order adsorption kinetics. HMBC had high selectivity for lead and cadmium, and the adsorption performance of HMBC was basically not reduced after five cycles. The above experimental results show that the newly prepared HMBC has the potential to treat lead and cadmium industrial wastewater.
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