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零价铁生物炭复合材料的热解行为及其对Cu(ii)的去除机制

Pyrolytic behavior of a zero-valent iron biochar composite and its Cu(ii) removal mechanism.

作者信息

Yu Changjiang, Zhang Dashuai, Dong Xinyu, Lin Qiang

机构信息

Key Laboratory of Water Pollution Treatment & Resource Reuse of Hainan Province, Key Laboratory of Tropical Medicinal Plant Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University No. 99 Longkunnan Road Haikou 571158 China

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology No. 68 Wenchang Road Kunming 650500 China.

出版信息

RSC Adv. 2018 Oct 4;8(59):34151-34160. doi: 10.1039/c8ra05676e. eCollection 2018 Sep 28.

DOI:10.1039/c8ra05676e
PMID:35548805
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9087118/
Abstract

The reduction behavior of Fe during the preparation of a zero-valent iron cocoanut biochar (ZBC8-3) by the carbothermic reduction method was analyzed. Fe was first converted into FeO, which was subsequently decomposed into FeO, and finally reduced to Fe. A minor amount of γ-FeO was produced in the process. The isothermal thermodynamic data for the removal of Cu(ii) over ZBC8-3 followed a Langmuir model. The Langmuir equation revealed a maximum removal capacity of 169.49 mg g at pH = 5 for ZBC8-3. The removal of Cu(ii) over ZBC8-3 fitted well to a pseudo-first-order equation, which suggested that the rate limiting step of the process was diffusion. The Cu(ii) removal mechanism on ZBC8-3 involved the reduction of Cu(ii) by Fe to produce Cu and CuO, while C[double bond, length as m-dash]C, C-O-, and -O-H formed a complex with Cu(ii).

摘要

分析了在通过碳热还原法制备零价铁椰子生物炭（ZBC8 - 3）过程中Fe的还原行为。Fe首先转化为FeO，随后FeO分解，最终还原为Fe。在此过程中产生了少量的γ - FeO。ZBC8 - 3对Cu(ii)去除的等温热力学数据遵循朗缪尔模型。朗缪尔方程表明，在pH = 5时，ZBC8 - 3对Cu(ii)的最大去除容量为169.49 mg/g。ZBC8 - 3对Cu(ii)的去除很好地符合准一级方程，这表明该过程的速率限制步骤是扩散。ZBC8 - 3上Cu(ii)的去除机制包括Fe将Cu(ii)还原生成Cu和CuO，同时C = C、C - O - 和 - O - H与Cu(ii)形成络合物。

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