Experimental study on adsorption characteristics of heavy metal $ Cu^{2+} $ by soil-bentonite mixture

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Dec.2024, Vol.47 No.12: 1662-1667

DOI: 10.3969/j.issn.1003-5060.2024.12.012

Authors

WANG Ziqi $ ^{1} $, XU Long $ ^{1} $, QIN Hao $ ^{1} $, SUN Xianguo $ ^{2} $, ZHA Fusheng $ ^{1} $

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. Anhui Huizi Engineering Construction Co., Ltd., Wuhu 241004, China)

Abstract and Keywords

Abstract: In order to further analyze the adsorption characteristics of heavy metal ions by soil-bentonite mixture, the adsorption test of $ Cu^{2+} $ in soil-bentonite mixture in typical tailings pond was carried out to explore the adsorption characteristics of $ Cu^{2+} $ by soil-bentonite mixture. The results show that with the increase of bentonite content, the maximum adsorption capacity and removal rate of $ Cu^{2+} $ by soil-bentonite mixture are increased. Under the same bentonite content, the higher the initial mass concentration of $ Cu^{2+} $, the lower the removal rate. The adsorption isothermal model analysis shows that the three models are suitable for the adsorption characteristics of the test. The maximum adsorption capacity $ Q_{m} $ based on the Langmuir model increases by 29.99% when the bentonite content increases to 20%, indicating that the addition of bentonite can significantly improve the adsorption capacity of the mixture. The adsorption constant $ K_{F} $ based on Freundlich model increases with the increase of bentonite content, indicating that the adsorption capacity is stronger with the increase of bentonite content. According to the D-R model, when the bentonite content is 0-20%, the adsorption characteristics of the mixture are mainly controlled by ion exchange adsorption. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses show that the adsorption mechanism of soil-bentonite is

Keywords: soil-bentonite; $ Cu^{2+} $; adsorption; adsorption isotherm model

作者信息

王子奇 $ ^{1} $，许龙 $ ^{1} $，秦皓 $ ^{1} $，孙献国 $ ^{2} $，查甫生 $ ^{1} $

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 安徽省荟资工程建设有限公司，安徽芜湖 241004)

摘要和关键词

摘要: 为深入分析土-膨润土混合物对重金属离子的吸附特性,文章开展典型尾矿库中 $ Cu^{2+} $ 在土-膨润土混合物中的吸附试验,探讨土-膨润土混合物对 $ Cu^{2+} $ 的吸附特征。结果表明:增大膨润土掺量,土-膨润土混合物对 $ Cu^{2+} $ 最大吸附量和去除率均提升;同一膨润土掺量下,初始 $ Cu^{2+} $ 质量浓度越高,去除率越低。吸附等温模型分析表明:3种模型均适用于试验的吸附特征,基于Langmuir模型的最大吸附量在膨润土掺量增加至20%时, $ Cu^{2+} $ 最大吸附量 $ Q_{m} $ 增加了29.99%,表明膨润土的掺入可显著提升混合物吸附能力;基于Freundlich模型的吸附常数 $ K_{F} $ 随膨润土掺量增大而增大,表明膨润土掺量越大,吸附能力越强;基于D-R模型,当膨润土掺量为0~20%时,混合物吸附特性主要由离子交换吸附所控制,并通过X射线衍射(X-ray diffraction, XRD)、扫描电子显微镜(scanning electron microscope, SEM)等分析,表明土-膨润土的吸附机理主要表现为离子交换吸附。

关键词: 土-膨润土； $ Cu^{2+} $；吸附；等温吸附模型

Funding

国家自然科学基金资助项目（42030710）；安徽省科技重大专项资助项目（18030801103）

合肥工业大学学报(自然科学版)

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