Adsorption Properties of Nano-MnO2-Biochar Composites for Copper in Aqueous Solution

文献类型： 外文期刊

第一作者： Zhou, Li

作者： Zhou, Li;Zhou, Li;Huang, Yifan;Liu, Zhongqi;Song, Zhengguo;Qiu, Weiwen;Sun, Zhanxiang

作者机构：

关键词： biochar;nano-MnO2-biochar composites;adsorption;copper

期刊名称：MOLECULES （ 影响因子：4.411； 五年影响因子：4.587 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： There is a continuing need to develop effective materials for the environmental remediation of copper-contaminated sites. Nano-MnO2-biochar composites (NMBCs) were successfully synthesized through the reduction of potassium permanganate by ethanol in a biochar suspension. The physicochemical properties and morphology of NMBCs were examined, and the Cu(II) adsorption properties of this material were determined using various adsorption isotherms and kinetic models. The adsorption capacity of NMBCs for Cu(II), which was enhanced by increasing the pH from 3 to 6, was much larger than that of biochar or nano-MnO2. The maximum adsorption capacity of NMBCs for Cu(II) was 142.02 mg/g, which was considerably greater than the maximum adsorption capacities of biochar (26.88 mg/g) and nano-MnO2 (93.91 mg/g). The sorption process for Cu(II) on NMBCs fitted very well to a pseudo-second-order model (R-2 > 0.99). Moreover, this process was endothermic, spontaneous, and hardly influenced by ionic strength. The mechanism of Cu(II) adsorption on NMBCs mainly involves the formation of complexes between Cu(II) and O-containing groups (e.g., COO-Cu and Mn-O-Cu). Thus, NMBCs may serve as effective adsorbents for various environmental applications, such as wastewater treatment or the remediation of copper-contaminated soils.

分类号： O62

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