Zwitterionic glycine modified Fe/Mg-layered double hydroxides for highly selective and efficient removal of oxyanions from polluted water
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第16期
论文作者：Xiaofeng Shi Chao Wang Jiaoxia Zhang Li Guo Jing Lin Duo Pan Juying Zhou Jincheng Fan Tao Ding Zhanhu Guo
文章页码：8 - 15
摘 要：Zwitterionic glycine was employed to modify Fe/Mg-layered double hydroxides（LDH） to realize an GFe/Mg-LDH adsorbent with high adsorption capacities of oxygen-containing anions including As（Ⅴ）, P（Ⅴ）and Cr（Ⅵ）. When the Fe/Mg mole ratio was 0.02 mol/0.02 mol, the G-Fe/Mg-LDH has a good adsorption performance. The optimum adsorption pH value of G-Fe/Mg-LDH for oxygen-containing anions was 6.The selectivity of three oxygen-containing anions was Cr（Ⅵ）<P（Ⅴ）<As（Ⅴ）, and the maximum adsorption capacity of As（Ⅴ） reached as high as 830 mg g-1, outperforming most previously reported efficient adsorbents for As（Ⅴ）. The adsorption process followed Freundlich isotherm and pseudo-second-order kinetic model, suggesting the heterogeneous adsorption and chemical adsorption of the G-Fe/Mg-LDH. When the initial concentration of As（Ⅴ） was 200 mg L-1, the adsorption efficiency of G-Fe/Mg-LDH was 82.5% within 30 min. This study provides a way to modify the LDHs for environmental remediation.
Xiaofeng Shi1，Chao Wang1,2，Jiaoxia Zhang3,4，Li Guo1，Jing Lin5，Duo Pan6，Juying Zhou7,8，Jincheng Fan9，Tao Ding8，Zhanhu Guo4
1. Advanced Energy Materials and Systems Institute, North University of China2. School of Materials Science and Engineering, North University of China3. School of Materials Science and Engineering, Jiangsu University of Science and Technology4. College of Chemistry and Chemical Engineering, Henan University5. School of Chemistry and Chemical Engineering, Guangzhou University6. Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University7. College of Materials Science and Engineering, Changsha University of Science and Technology8. School of Chemistry and Chemical Engineering, Guangxi University for Nationalities9. Integrated Composites Lab (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee
摘 要：Zwitterionic glycine was employed to modify Fe/Mg-layered double hydroxides（LDH） to realize an GFe/Mg-LDH adsorbent with high adsorption capacities of oxygen-containing anions including As（Ⅴ）, P（Ⅴ）and Cr（Ⅵ）. When the Fe/Mg mole ratio was 0.02 mol/0.02 mol, the G-Fe/Mg-LDH has a good adsorption performance. The optimum adsorption pH value of G-Fe/Mg-LDH for oxygen-containing anions was 6.The selectivity of three oxygen-containing anions was Cr（Ⅵ）<P（Ⅴ）<As（Ⅴ）, and the maximum adsorption capacity of As（Ⅴ） reached as high as 830 mg g-1, outperforming most previously reported efficient adsorbents for As（Ⅴ）. The adsorption process followed Freundlich isotherm and pseudo-second-order kinetic model, suggesting the heterogeneous adsorption and chemical adsorption of the G-Fe/Mg-LDH. When the initial concentration of As（Ⅴ） was 200 mg L-1, the adsorption efficiency of G-Fe/Mg-LDH was 82.5% within 30 min. This study provides a way to modify the LDHs for environmental remediation.
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