Selective recovery of Cu(II) from strongly acidic wastewater by zinc dimethyldithiocarbamate: Affecting factors, efficiency and mechanism

IF 6.9 Q1 Environmental Science

Journal of environmental sciences Pub Date : 2023-07-01 DOI:10.1016/j.jes.2022.08.019

Xin Yang , Xingyun Hu , Linghao Kong , Xianjia Peng

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Abstract

The selective recovery of copper from strongly acidic wastewater containing mixed metal ions remains a significant challenge. In this study, a novel reagent zinc dimethyldithiocarbamate (Zn(DMDC)₂) was developed for the selective removal of Cu(II). The removal efficiency of Cu(II) reached 99.6% after 120 min reaction at 30°C when the mole ratio Zn(DMDC)₂/Cu(II) was 1:1. The mechanism investigation indicates that the Cu(DMDC)₂ products formed as a result of the displacement of Zn(II) from the added Zn(DMDC)₂ by Cu(II) in wastewater, due to the formation of stronger coordination bonds between Cu(II) and the dithiocarbamate groups of Zn(DMDC)₂. Subsequently, we put forward an innovative process of resource recovery for strongly acidic wastewater. Firstly, the selective removal of Cu(II) from actual wastewater using Zn(DMDC)₂, with a removal efficiency of 99.7%. Secondly, high-value CuO was recovered by calcining the Cu(DMDC)₂ at 800°C, with a copper recovery efficiency of 98.3%. Moreover, the residual As(III) and Cd(II) were removed by introducing H₂S gas, and the purified acidic wastewater was used to dissolve ZnO for preparation of valuable ZnSO₄·H₂O. The total economic benefit of resource recovery is estimated to be 11.54 $/m³. Accordingly, this study provides a new route for the resource recovery of the treatment of copper-containing acidic wastewater.

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二甲基二硫代氨基甲酸锌从强酸性废水中选择性回收Cu(II):影响因素、效率及机理

从含有混合金属离子的强酸性废水中选择性回收铜仍然是一个重大挑战。本研究开发了一种用于选择性去除Cu（II）的新型试剂二甲基二硫代氨基甲酸锌（Zn（DMDC）2）。当Zn（DMDC）2/Cu（II）的摩尔比为1:1时，在30°C下反应120分钟后，Cu（Ⅱ）的去除率达到99.6%。机理研究表明，由于Cu（II）与Zn（DMDC）2的二硫代氨基甲酸酯基团之间形成了更强的配位键，Cu（DMDC。随后，我们提出了一种创新的强酸性废水资源回收工艺。首先，使用Zn（DMDC）2从实际废水中选择性去除Cu（II），去除率为99.7%。其次，通过在800°C下煅烧Cu（DMDB）2回收高价值的CuO，铜回收率为98.3%。此外，通过引入H2S气体去除残留的As（III）和Cd（II），并将纯化的酸性废水用于溶解ZnO，制备有价值的ZnSO4·H2O。资源回收的总经济效益估计为11.54美元/立方米。因此，本研究为含铜酸性废水的资源化处理提供了一条新的途径。

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来源期刊

Journal of environmental sciences Environmental Science (General)

CiteScore

12.80

自引率

0.00%

发文量

审稿时长

17 days

期刊介绍： Journal of Environmental Sciences is an international peer-reviewed journal established in 1989. It is sponsored by the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, and it is jointly published by Elsevier and Science Press. It aims to foster interdisciplinary communication and promote understanding of significant environmental issues. The journal seeks to publish significant and novel research on the fate and behaviour of emerging contaminants, human impact on the environment, human exposure to environmental contaminants and their health effects, and environmental remediation and management. Original research articles, critical reviews, highlights, and perspectives of high quality are published both in print and online.