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虾壳粉吸附水溶液中阴阳离子染料
Application of shrimp shell powder for removal of cationic dye and anionic dye from aqueous solutions
投稿时间:2018-09-22  修订日期:2018-12-24
DOI:
中文关键词:  水处理  吸附  虾壳粉  阴阳离子染料  
英文关键词:cationic dye and anionic dye  adsorption  shrimp shell powder  wastewater treatment
基金项目:
作者单位E-mail
吴琦 浙江大学海洋学院 790354310@qq.com 
戴凌青 浙江大学海洋学院  
杨文叶 浙江大学海洋学院  
葛柳钦 浙江大学海洋学院  
夏枚生 浙江大学海洋学院 msxia@zju.edu.cn 
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中文摘要:
      采用废弃虾壳制备吸附剂处理含刚果红或亚甲基蓝的溶液。考察了温度、吸附时间、初始浓度、吸附剂投加量和初始溶液pH对吸附效果的影响并构建了去除率预测模型,对吸附等温线、吸附动力学和吸附热力学进行了系统研究。实验结果表明,虾壳粉对刚果红和亚甲基蓝的吸附分别在24 h和4 h时达到平衡,平衡吸附量随吸附时间、初始浓度及吸附剂投加量的增加而增大;刚果红平衡吸附量随pH升高而增大,亚甲基蓝平衡吸附量几乎不随pH变化。在15 ℃下,吸附剂投加量为1 g?L-1,刚果红吸附的最优条件为接触时间24 h、pH为 4,在该条件下虾壳粉对刚果红的饱和吸附量为276.64 mg?g-1;亚甲基蓝吸附的最优条件为接触时间4 h、pH为12,在该条件下虾壳粉对刚果红的饱和吸附量为1.44 mg?g-1;虾壳粉对2种染料的吸附过程以物理吸附为主,符合准二级动力学方程。虾壳粉对阴离子型染料的吸附效果较优,对阳离子型染料有一定吸附性能,是一种经济高效的染料废水吸附材料。
英文摘要:
      Shrimp shell-based bioadsorbent was prepared and applied in adsorptive removal of Congo Red and Methylene Blue. The effects of contact time, initial dye concentration, adsorbent dosage and initial solution pH on adsorption were systematically investigated, and the removal efficiency prediction model was subsequently built, followed by the study of adsorption isotherm, adsorption kinetics and adsorption thermodynamics. The results revealed that the adsorption of Congo red and methylene blue by shrimp shell powder reached equilibrium at 24 h and 4 h, respectively. The equilibrium adsorption capacity increased with increasing adsorption time, the initial concentration of adsorbate and dosage. With an increase in pH, the equilibrium adsorption capacity of Congo red increased and that of methylene blue hardly decreased. At 15 oC (dose:1 g?L-1) , the saturated adsorption capacity of shrimp shell powder for Congo Red was 276.64 mg?g-1 under the optimum condition (time:24 h, pH:4) and that for Methylene Blue was 1.44 mg?g-1 under the optimum condition (time: 4 h, pH:12). It is indicated that the adsorption for both Congo Red and Methylene Blue to shrimp shell were mainly via physical adsorption and could be better described by a pseudo-second-order model. Overall, shrimp shell-based bioadsorbent exhibited an excellent effect for the removal of Congo Red and a slightly weaker one for the removal of Methylene Blue than the former. It is expected to be an economical and efficient material for wastewater treatment.
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