Stellerite-seeded facile synthesis of zeolite X with excellent aqueous Cd2+ and Ni2+ adsorption performance |
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Authors: | Yinchang Pei Shengpeng Mo Qinglin Xie Nanchun Chen Zhongxin Yang Lili Huang Lili Ma |
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Affiliation: | 1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, China;3. College of Material Science and Engineering, Guilin University of Technology, Guilin 541006, China |
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Abstract: | Zeolite X was synthesized by a two-step hydrothermal method using natural stellerite zeolite as the silicon seed, and its adsorption performance for Cd2+ and Ni2+ ions was experimentally and comprehensively investigated. The effects of pH, zeolite X dosage, contact time, and temperature on adsorption performance for Cd2+ and Ni2+ ions over were studied. The adsorption process was endothermic and spontaneous, and followed the pseudo-second-order kinetic and the Langmuir isotherm models. The maximum adsorption capacitiesfor Cd2+ and Ni2+ ions at 298 K were 173.553 and 75.897 mg·g-1, respectively. Ion exchange and precipitation were the principal mechanisms for the removal of Cd2+ ions from aqueous solutions by zeolite X, followed by electrostatic adsorption. Ion exchange was the principal mechanisms for the removal of Ni2+ ions from aqueous solutions by zeolite X, followed by electrostatic adsorption and precipitation. The zeolite X converted from stellerite zeolite has a low n(Si/Al), abundant hydroxyl groups, and high crystallinity and purity, imparting a good adsorption performance for Cd2+ and Ni2+ ions. This study suggests that zeolite X converted from stellerite zeolite could be a useful environmentally-friendly and effective tool for the removal of Cd2+ and Ni2+ ions from aqueous solutions. |
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Keywords: | Zeolite X Stellerite zeolite Adsorption mechanism Cd2+ adsorption Ni2+ adsorption Ion exchange |
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