Simultaneous adsorption of Hg 2+ , Cd 2+ and Cu 2+ ions from aqueous solution with mesoporous silica/DZ and conditions optimise with experimental design: kinetic and isothermal studies

Micro & nano letters

article

Samaneh Nazerdeylami¹  Rouholah Zare-Dorabei¹ 

[1] Research Laboratory of Spectrometry & Micro and Nano Extraction, Department of Chemistry, Iran University of Science and Technology

关键词: pH;    atomic absorption spectroscopy;    adsorption;    X-ray diffraction;    cadmium;    scanning electron microscopy;    copper;    water treatment;    mercury (metal);    reaction kinetics theory;    mesoporous materials;    silicon compounds;    design of experiments;    Fourier transform infrared spectra;    Tempkin isotherm model;    water treatment;    time 20.0 min;    mass 20.0 mg;    Cd;    Cu;    Hg;    mercury;    Freundlich isotherm model;    pH value;    dithizon material;    mesoporous silica material;    santa barbara amorphous synthesis;    adsorption process;    Elovich model;    pseudofirst order kinetic model;    Langmuir isotherm model;    Brunauer-Emmett-Teller method;    ethylenediamminetetraacetate solution;    pseudosecond-order kinetic model;    central composite design;    sorbent dosage;    inductively coupled plasma optical emission spectrometry;    atomic absorption spectrometry;    heavy metal ions;    Fourier-transform infrared spectroscopy;    X-ray diffraction;    copper;    cadmium;    experimental design;    aqueous solution;   

DOI  :  10.1049/mnl.2018.5775

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

This study used dithizon (DZ) and mesoporous as a sorbent for simultaneous removal of heavy metal (mercury, cadmium and copper) ions from aqueous solution and real samples. Santa Barbara Amorphous synthesised and characterised by X-ray diffraction, Fourier-transform infrared spectroscopy and Brunauer–Emmett–Teller. Heavy metal ions measured by atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry. Optimised conditions such as pH, removal time, sorbent dosage and concentration analyte with central composite design and obtained 5, 20 min, 20 mg and 25 ppm, respectively. The equilibrium data were fitted to isotherm models such as Langmuir, Freundlich and Tempkin and the results revealed the suitability of the Langmuir model. The maximum adsorption capacities for Hg 2+ , Cd 2+ and Cu 2+ ions achieved 25.04, 30.3 and 31.79 mg/g, respectively. Kinetics data fitting to pseudo-first order, pseudo-second-order and Elovich models confirmed the applicability of pseudo-second-order kinetic model for the description of the mechanism and adsorption rate. This sorbent could regenerate easily with ethylenediamminetetraacetate solution.

【 授权许可】

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