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水溶液中煅烧天然凹凸棒石和煅烧氢氧化铝改性凹凸棒石对Cd(ii)吸附的对比研究。

A comparative study of Cd(ii) adsorption on calcined raw attapulgite and calcined aluminium hydroxide-modified attapulgites in aqueous solution.

作者信息

Zhang Qinhu, Chu Run, Wei Yuzhen, Cai Liqun

机构信息

College of Resources and Environment, Gansu Agricultural University Lanzhou 730070 China

出版信息

RSC Adv. 2022 May 6;12(22):13695-13705. doi: 10.1039/d2ra00720g. eCollection 2022 May 5.

DOI:10.1039/d2ra00720g
PMID:35530389
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9074160/
Abstract

In this study, raw attapulgite and two aluminium hydroxide-modified attapulgites prepared using different aluminium salts were calcined at 600 °C to successfully prepare three novel adsorbents (C-ATP, C-ATP-SO and C-ATP-Cl). The three adsorbents were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS). Batch experiments revealed that the Cd(ii) adsorption capacity of the three adsorbents increased with increasing pH, increasing the initial concentration of Cd(ii) in solution, and with longer adsorption times. The order of adsorption capacity was always C-ATP > C-ATP-Cl > C-ATP-SO . C-ATP and C-ATP-Cl were better described by the Langmuir model, while C-ATP-SO was better described by the Freundlich model. The three adsorbents reached adsorption equilibrium within 2 h, and all followed pseudo-second order kinetics. The adsorption of Cd(ii) onto the three adsorbents was physisorption, as suggested by the calculated thermodynamic parameters. Although the adsorption of Cd(ii) on C-ATP and C-ATP-Cl was exothermic, the adsorption on C-ATP-SO was endothermic. Ion exchange and cadmium precipitation were the primary mechanisms of cadmium adsorption on the three adsorbents analysed by XPS. The presence of SO in C-ATP-SO may result in weaker binding of Cd(ii) by the adsorbent than C-ATP-Cl.

摘要

在本研究中，将天然凹凸棒石以及使用不同铝盐制备的两种氢氧化铝改性凹凸棒石在600℃下煅烧，成功制备了三种新型吸附剂（C-ATP、C-ATP-SO 和C-ATP-Cl）。通过透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、布鲁诺尔-埃米特-泰勒（BET）分析和X射线光电子能谱（XPS）对这三种吸附剂进行了表征。批量实验表明，三种吸附剂对Cd（ii）的吸附容量随pH值升高、溶液中Cd（ii）初始浓度增加以及吸附时间延长而增加。吸附容量顺序始终为C-ATP > C-ATP-Cl > C-ATP-SO 。Langmuir模型能更好地描述C-ATP和C-ATP-Cl，而Freundlich模型能更好地描述C-ATP-SO 。三种吸附剂在2小时内达到吸附平衡，且均遵循准二级动力学。根据计算得到的热力学参数表明，Cd（ii）在三种吸附剂上的吸附为物理吸附。虽然Cd（ii）在C-ATP和C-ATP-Cl上的吸附是放热的，但在C-ATP-SO 上的吸附是吸热的。通过XPS分析，离子交换和镉沉淀是三种吸附剂吸附镉的主要机制。C-ATP-SO 中SO 的存在可能导致吸附剂对Cd（ii）的结合力比C-ATP-Cl弱。

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