文章摘要
肖婉露,程金凤,郭瑞军,赵庆春,常朝阳,姜在民.四尾栅藻(Scenedesmus quadricauda)对Cd(Ⅱ)的吸附效率及吸附动力学研究[J].农业环境科学学报,2016,35(8):1595-1601.
四尾栅藻(Scenedesmus quadricauda)对Cd(Ⅱ)的吸附效率及吸附动力学研究
Efficiency and kinetics of Cd(Ⅱ) adsorption by Scenedesmus quadricauda
投稿时间:2016-02-08  
DOI:10.11654/jaes.2016-0179
中文关键词: 四尾栅藻    吸附  动力学
英文关键词: Scenedesmus quadricauda  cadmium  absorption  kinetics
基金项目:西北农林科技大学基本科研业务费专项资金(2014YB038);西北农林科技大学2015年国家级“大学生创新创业训练计划项目”(201510712028);西北农林科技大学2015年“大学生创新创业训练计划”校重点项目(1201510712157)
作者单位E-mail
肖婉露 西北农林科技大学生命科学学院, 陕西 杨凌 712100  
程金凤 西北农林科技大学生命科学学院, 陕西 杨凌 712100 chengjinfeng@nwsuaf.edu.cn 
郭瑞军 西北农林科技大学生命科学学院, 陕西 杨凌 712100  
赵庆春 西北农林科技大学林学院, 陕西 杨凌 712100  
常朝阳 西北农林科技大学生命科学学院, 陕西 杨凌 712100  
姜在民 西北农林科技大学生命科学学院, 陕西 杨凌 712100  
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中文摘要:
      研究了不同初始pH值(3、4、5、6、7)和不同初始金属镉浓度(0.5、5、10、20 mg·L-1)条件下,四尾栅藻(Scenedesmus quadricauda)干藻粉对重金属镉吸附效率的变化,并采用伪一阶动力学方程、伪二阶动力学方程和Elovich动力学方程对实验数据进行了拟合。结果表明:在不同的初始镉离子浓度和不同的初始pH值条件下,随着时间推移,吸附效率均呈现先上升后稳定的趋势,在约60 min时吸附达到平衡;随着初始pH值的升高,平衡时刻四尾栅藻对镉的吸附效率呈现先上升后下降的趋势,初始pH值为6时最大;随着初始镉浓度从0.5 mg·L-1上升到20 mg·L-1,平衡时刻吸附效率也呈现先上升后下降的趋势,在10 mg·L-1吸附效率达到最大值72.93%。四尾栅藻干藻粉对镉的吸附动力学符合伪二阶动力学方程,表明四尾栅藻的吸附过程是表面的、持续的过程。
英文摘要:
      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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