Adsorption efficiency of Ni(II) in water by ultrasonically oxidized multi-walled carbon nanotubes
HOU Pin1,,, YANG Xiaoyu1, HUO Yanlong2, ZHANG Nannan1, LIU Hao1, GUO Jianhui1, DONG Huiyu3, QIANG Zhimin3 1.School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China 2.State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
Abstract:In order to solve the problem of excessive Ni(II), a kind of trace carcinogen in ground water, we herein developed an efficient adsorbent for Ni(II) in this study, which was called ultrasonically oxidized multi-walled carbon nanotubes(MWCNTs-Mn). Firstly, the preparation conditions of MWCNTs-Mn was optimized by single factor variable method, and the adsorption efficiency of MWCNTs-Mn toward Ni(II) in water was investigated through kinetics and isothermal adsorption, and then the adsorption mechanism was explored based on the surface physicochemical characterization. The results showed that the highest adsorption efficiency of MWCNTs-Mn toward Ni(II) occurred at the KMnO4 dosage of 2.1 g, ultrasonic oxidation time of 2.5 h and temperature of 35 ℃, and the maximum adsorption capacity of MWCNTs-Mn toward Ni(II) in water was 22.37 mg·g?1, which was 16.61 times higher than that before oxidation; the adsorption of Ni(II) in water by MWCNTs-Mn could be fitted with Langmuir(R2=0.996 2) and quasi-second-order kinetic adsorption model(R2=0.997 1), indicating that the adsorption was a monolayer and chemical adsorption; compared with that before ultrasonic oxidation, the mesopore volume of MWCNTs-Mn decreased by 72.25%, the oxygen amount increased by 12.68 %, which suggested that the ultrasonic oxidation improved the amount of hydrophilic oxygen-containing functional group(hydroxyl and carboxyl) on the surface of MWCNTs-Mn. The improved adsorption performance was accomplished by the surface complexation with Ni(II) in water. The optimized synthesis of the adsorbent material can provide a good theoretical basis and technical support for the effective removal of Ni(II) from groundwater. Key words:ultrasonic oxidation/ multi-walled carbon nanotubes/ adsorption/ Ni(II).
图1不同制备条件对超声氧化MWCNTs吸附水中Ni(Ⅱ)的效能影响 Figure1.Effect of different preparation conditions on the adsorption performance of ultrasonically oxidized MWCNTs toward Ni(Ⅱ) in water
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1.School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China 2.State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China Received Date: 2021-02-25 Accepted Date: 2021-05-12 Available Online: 2021-07-23 Keywords:ultrasonic oxidation/ multi-walled carbon nanotubes/ adsorption/ Ni(II) Abstract:In order to solve the problem of excessive Ni(II), a kind of trace carcinogen in ground water, we herein developed an efficient adsorbent for Ni(II) in this study, which was called ultrasonically oxidized multi-walled carbon nanotubes(MWCNTs-Mn). Firstly, the preparation conditions of MWCNTs-Mn was optimized by single factor variable method, and the adsorption efficiency of MWCNTs-Mn toward Ni(II) in water was investigated through kinetics and isothermal adsorption, and then the adsorption mechanism was explored based on the surface physicochemical characterization. The results showed that the highest adsorption efficiency of MWCNTs-Mn toward Ni(II) occurred at the KMnO4 dosage of 2.1 g, ultrasonic oxidation time of 2.5 h and temperature of 35 ℃, and the maximum adsorption capacity of MWCNTs-Mn toward Ni(II) in water was 22.37 mg·g?1, which was 16.61 times higher than that before oxidation; the adsorption of Ni(II) in water by MWCNTs-Mn could be fitted with Langmuir(R2=0.996 2) and quasi-second-order kinetic adsorption model(R2=0.997 1), indicating that the adsorption was a monolayer and chemical adsorption; compared with that before ultrasonic oxidation, the mesopore volume of MWCNTs-Mn decreased by 72.25%, the oxygen amount increased by 12.68 %, which suggested that the ultrasonic oxidation improved the amount of hydrophilic oxygen-containing functional group(hydroxyl and carboxyl) on the surface of MWCNTs-Mn. The improved adsorption performance was accomplished by the surface complexation with Ni(II) in water. The optimized synthesis of the adsorbent material can provide a good theoretical basis and technical support for the effective removal of Ni(II) from groundwater.
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