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| Efficiency and kinetics of Cd(Ⅱ) adsorption by Scenedesmus quadricauda |
| Received:February 08, 2016 |
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| KeyWord:Scenedesmus quadricauda;cadmium;absorption;kinetics |
| Author Name | Affiliation | E-mail | | XIAO Wan-lu | College of Life Sciences, Northwest A & F University, Yangling 712100, China | | | CHENG Jin-feng | College of Life Sciences, Northwest A & F University, Yangling 712100, China | chengjinfeng@nwsuaf.edu.cn | | GUO Rui-jun | College of Life Sciences, Northwest A & F University, Yangling 712100, China | | | ZHAO Qing-chun | College of Forestry, Northwest A & F University, Yangling 712100, China | | | CHANG Zhao-yang | College of Life Sciences, Northwest A & F University, Yangling 712100, China | | | JIANG Zai-min | College of Life Sciences, Northwest A & F University, Yangling 712100, China | |
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| Abstract: |
| Cadmium(Cd) is an important environmental pollutant. Removal of Cd by bi-adsorption is receiving extensive attention. In this study, dry powder of green microalgae Scenedesmus quadricauda was used as a biosorbent to remove Cd(Ⅱ) from aqueous solution. Efficiency and kinetics of Cd(Ⅱ) biosorption on S. quadricauda were investigated by using pseudo-first-order, pseudo-second-order and Elovich kinetic models to fit the experimental data. Results showed that the adsorption efficiency increased at the beginning with a rapid metal removal, and then reached an equilibrium after about 60 min under different initial pH values and different initial Cd(Ⅱ) concentrations. With increases in pH, the adsorption efficiency of Cd(Ⅱ) by S. quadricauda increased at first, and then decreased, with the maximum efficiency occurred at initial pH of 6. Similarly, with increasing the initial Cd(Ⅱ) concentration from 0.5 mg·L-1 to 20 mg·L-1, the efficiency of Cd(Ⅱ) adsorption first increased and then decreased, with the maximum biosorption efficiency of 72.93%. The kinetics of Cd(Ⅱ) adsorption on S. quadricauda could be described by the pesudo-second-order equation, indicating that the Cd(Ⅱ) adsorption by S. quadricauda powder was surfacial and continuous process. |
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