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Rapid biosorption and reduction removal of Cr(Ⅵ) from aqueous solution by dried seaweeds 被引量:1
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作者 贾成光 张亚平 +3 位作者 王鹤 欧光南 刘启明 林锦美 《Journal of Central South University》 SCIE EI CAS 2014年第7期2801-2809,共9页
Four types of common seaweeds(Laminaria japonica,Undaria pinnatifida,Porphyra haitanensis,and Gracilaria lemaneiformis) were examined to remove Cr(Ⅵ) ions from aqueous solution.The experimental parameters that affect... Four types of common seaweeds(Laminaria japonica,Undaria pinnatifida,Porphyra haitanensis,and Gracilaria lemaneiformis) were examined to remove Cr(Ⅵ) ions from aqueous solution.The experimental parameters that affected the biosorption process including pH,biomass dosage,contact time and temperature were investigated via batch experiments.The surface characteristics of seaweeds before and after Cr(Ⅵ) adsorption were studied with scanning electron microscopy and Fourier transform infrared spectroscopy.The results show that an initial solution with the pH of 1.0 is most favorable for Cr(Ⅵ) adsorption.Rapid adsorption is observed in the initial stage and adsorption equilibrium state is reached within 1 h.The adsorption efficiency by Porphyra haitanensis is the maximum among four types of seaweed powders,followed by Laminaria japonica and Undaria pinnatifida with biosorption efficiency up to 90%.The removal rate of Gracilaria lemaneiformis is less than 60%.The kinetic data obtained using the seaweeds are found to follow pseudo-second order kinetic model.Experimental sorption data adequately correlate with the Langmuir model.FTIR indicates that amino and carboxyl groups play an important role in the process of Cr(Ⅵ) adsorption and a large percentage of Cr(Ⅵ) ions are reduced by reductive groups on the surface of seaweeds. 展开更多
关键词 BIOSORPTION hexavalent chromium SEAWEED REDUCTION
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基于光的波粒二象性猜想的数学仿真
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作者 周晨腾 杨升高 +2 位作者 李宝强 黄思训 项杰 《数学的实践与认识》 CSCD 北大核心 2012年第14期43-51,共9页
针对2011年全国研究生数学建模竞赛A题,研究光子的内在性质,在两种波粒二象性猜想的基础上,解释并建立了光微子衍射发生概率模型、光电磁场双缝干涉模型以及光电磁场的偏振过程,并设计蒙特卡洛验证算法和编写仿真软件进行实验,较为完整... 针对2011年全国研究生数学建模竞赛A题,研究光子的内在性质,在两种波粒二象性猜想的基础上,解释并建立了光微子衍射发生概率模型、光电磁场双缝干涉模型以及光电磁场的偏振过程,并设计蒙特卡洛验证算法和编写仿真软件进行实验,较为完整地回答了提出的问题. 展开更多
关键词 光微子模型 电磁场模型 蒙特卡洛算法 衍射 偏振原理
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