Investigation of layered double hydroxide/carbon dot nanocomposite on removal efficiency of Pb2+ from aqueous solution

被引:22
作者
Farahani, Fataneh Vasheghani [1 ]
Amini, Mohammad Hassan [1 ]
Ahmadi, Seyed Hamid [1 ]
Zakaria, Seyed Amirabbas [1 ]
机构
[1] Chem & Chem Engn Reasearch Ctr Iran, Fac Environm Analyt Chem & Clean Technol, Tehran, Iran
关键词
Layered Double Hydroxide (LDH); Adsorption; Pb2+ (Lead); Carbon dot (C-dot); Nanocomposite; HEAVY-METAL IONS; GRAPHENE OXIDE; WASTE-WATER; ADSORPTION; COMPOSITE; ADSORBENT; PB(II); COIMMOBILIZATION; SR2+;
D O I
10.1016/j.molliq.2021.116774
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, double layered hydroxide (LDH)/carbon dot (C-dot) nanocomposite was synthesized using coprecipitation and hydrothermal methods, respectively, and used to remove Pb2+ ions from water. The chemical composition and morphology of the Mg-Al LDH/C-dot nanocomposite structure were investigated by Fourier transform infrared spectroscopy (FT-IR), x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and fluorescence spectroscopy (FS). Batch adsorption was accomplished to evaluate the process of Pb2+ adsorption by Mg-Al LDH/C-dot nanocomposite. For this purpose, parameters were optimized such as pH, C-dot to Mg-Al LDH ratio, adsorbent dosage, and contact time. The value obtained are 7, 0.25, 16 mg and 40 min, respectively. The results showed that the adsorption of Pb2+ on the Mg-Al LDH/C-dot nanocomposite has a maximum adsorption capacity of 41.32 (mg.g(-1)), which can be attributed to the available presence of functional groups. The adsorbent performance was investigated by the Langmuir, Freundlich and Dubinin-Radushkevich isotherms and the pseudo-first-order and pseudo-second-order kinetic models, respectively. Adsorption isotherm followed the Langmuir equation, that demonstrate monolayer adsorption and the pseudo-second-order kinetic model shows that a chemical adsorption controls the reaction rate. According to the results, the Mg-Al LDH/C-dot nanocomposite can be considered as an efficient adsorbent for the adsorption of Pb2+ ion from aqueous solution. (C) 2021 Elsevier B.V. All rights reserved.
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页数:9
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