Adsorption of heavy metal and organic pollutant by organo-montmorillonites in binary-component system
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Adsorption of heavy metal and organic pollutant by organo‑montmorillonites in binary‑component system Guifang Wang1,2,3 · Xiaolong Wang1 · Shuai Zhang4 · Shaojian Ma1 · Yiwen Wang1 · Jun Qiu5
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this study, the adsorption capacity of organo-montmorillonites (OMt) modified with cationic surfactants and chelating reagent toward binary-component, heavy metal and organic pollutant, in aqueous solution was investigated through batch experiments. The characteristics of the OMt were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), Specific surface area (BET), respectively, confirming that hexadecyl trimethyl ammonium chloride (CTAC), ethylene diamine tetraacetic acid (EDTA) and 1,6-diaminohexane (DA) were successfully introduced into Na+-Mt. Comparing with stronger Zn2+ removal efficiency onto EDTA-Mt and DA-Mt dominated by forming complexes in the binary-component systems, CTAC–EDTA-Mt and CTAC–DA-Mt gained a huge edge in uptaking phenol controlled by layer partition. Factors containing the initial Zn2+/phenol concentration and the competitive adsorption where the Zn2+, Pb2+, Cd2+ and phenol/ Zn2+, p-nitrophenol, phenylamine and phenol coexisted in the aqueous solution were shown in the paper. Furthermore, the desorption of Zn2+ and phenol on the CTAC–DA-Mt was investigated by series experiments under various conditions (with the type of chemical reagents, variable concentration of desorbent and contact time). The results showed HCl solution had higher efficiency on desorbing Zn2+ over phenol onto the CTAC–DA-Mt. CTAC–EDTA-Mt and CTAC–DA-Mt had potential applications in dealing with the wastewater where heavy metals and organic pollutants coexist. Keywords Montmorillonite · Adsorption · Heavy metal · Organic pollutant · Coexistence
1 Introduction
* Guifang Wang [email protected] * Jun Qiu [email protected] 1
School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
2
State Key Laboratory of Mineral Processing, BGRIMM Technology Group, Beijing 100160, China
3
Guangxi Key Laboratory of Processing for Non‑Ferrous Metals and Featured Materials, Guangxi University, Nanning 530004, China
4
Sinosteel Mining Company Limited, Sinosteel Corporation, Beijing 100080, China
5
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Heavy metals and organic pollutants are major contaminants in wastewater, what’s more, their low biodegradability and present carcinogenic properties arise public concern [1, 2]. There is recurring presence of these heavy metals and organic pollutants in water bodies through frequent use, causing serious pollution problems. However, some heavy metals ions, such as Pb2+, Zn2+, Cd2+, and organic pollutants can be found highly toxic to human beings and animals even at low concentrations [3]. In some cases, the heavy metals always coexist with organic contaminants in
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