Synthesis of zeolite Y from diatomite and its modification by dimethylglyoxime for the removal of Ni(II) from aqueous solution
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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, CNi(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.
KeywordsNi(II) removal Diatomite Zeolite Dimethylglyoxime Sorption
This work was partially supported by the National Natural Science Foundation of China (Grant No. 21271037) and Science research project of Liaoning Province Education Department (L2015123).
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