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论文类型：期刊论文

发表时间：2016-10-01

发表刊物：JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：80

期号：1

页面范围：215-225

ISSN号：0928-0707

关键字：Ni(II) removal; Diatomite; Zeolite; Dimethylglyoxime; Sorption

摘要：Zeolite Y was obtained from diatomite in a template-free system, and the product was modified by dimethylglyoxime. Characterization studies indicate that the DMG molecules were loaded onto both the exterior surfaces and channels of the zeolite Y during the modification process. Removal of Ni(II) by modified samples was investigated in batch procedure, and it was found that the modified zeolite Y has a very high capacity. The effects of various parameters such as sorbent content, contact time, concentration of nickel solution, pH and selectivity were discussed. The best removal efficiency was observed by Y-DMG at the following experimental conditions: Y-DMG dosage: 2 g L-1, C-Ni(II): 100 mg L-1 and contact time: 9 h. The Y-DMG sorbent shows good efficiency for the removal of nickel in the presence of different multivalent cations. Adsorption kinetics based on the pseudo-second-order rate equation indicates that the rate-limiting step involves chemical reaction. Adsorption isotherms of Ni(II) ions obey Langmuir equation which indicates the monolayer sorption of Ni(II). The results of thermodynamic parameters of Ni(II) on Y-DMG indicate the process was endothermic and spontaneous.