Facile synthesis of bioglass nanospheres for the adsorption of cationic and anionic dyes from aqueous solution |
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| Authors: | Liying Li Huan Wang Zhaohui Zhang Xi Chen Qiuyue Li |
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| Affiliation: | 1. Supported by State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, P.R. China;2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, P.R. Chinaliliying_tjpu@163.com;4. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, P.R. China;5. School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, P.R. China |
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| Abstract: | A novel adsorbent, bioglass nanospheres (BGN), has been prepared by a facile process. The BGN were spheres with an amorphous structure and a relatively high specific surface area, as indicated by SEM, transmission electron microscopy, BET, FTIR, and XRD. This paper was aimed at evaluating the adsorption behavior of this new material for the adsorptive removal of cationic (methylene blue, neutral red) and anionic (congo red) dyes from aqueous solution. The effects of the initial dye concentration, contact time, solution pH, and temperature were investigated. The adsorption kinetics showed that the adsorption behavior followed the pseudo-second-order kinetic model. The adsorption isotherm fit well to the Langmuir model. Thermodynamic analyses showed that the adsorption was physisorption, and it was also a spontaneous and endothermic process. The BGN exhibited a good reusability after five consecutive cycles for cationic dyes. In addition, the possible adsorption mechanism was also proposed based on the above experimental results. |
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| Keywords: | Adsorption bioglass nanospheres dyes kinetics thermodynamics |
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