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Zeolite A synthesized from alkaline assisted pre-activated halloysite for efficient heavy metal removal in polluted river water and industrial wastewater |
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| Authors: | Qingpeng Meng Hong Chen Junzhong Lin Zhang Lin Junliang Sun |
| Institution: | 1 Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2 Berzelii Center EXSELENT on Porous Materials, Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden;3 School of Environment and Energy, South China University of Technology, The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters (Ministry of Education), Guangzhou Higher Education Mega Center, Guangzhou 510006, China;4 College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China |
| Abstract: | High quality zeolite A was synthesized through a hydrothermal process using alkaline-assisted pre-activated halloysite mineral as the alumina and silica source. The synthesis conditions employed in this study were finely tuned by varying the activating temperature, sodium hydroxide content, water content and Si/Al ratio. The obtained zeolite A showed excellent adsorption properties for both single metal cation solutions and mixed cation solutions when the concentrations of the mixed cations were comparable with those in polluted natural river water and industrial wastewater. High adsorptive capacities for Ag+ (123.05 mg/g) and Pb2 + (227.70 mg/g) were achieved using the synthesized zeolite A. This observation indicates that the zeolite A synthesized from alkaline-assisted pre-activated halloysite can be used as a low-cost and relatively effective adsorbent to purify heavy metal cation polluted natural river water and industrial wastewater. |
| Keywords: | Zeolite Heavy metal River water Industrial wastewater |
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