【摘要】 本文以耐辐射奇球菌作为生物吸附剂去除溶液中的Cu²⁺和Cr⁶⁺,通过考察吸附时间、初始离子浓度、菌液浓度等影响吸附效果的关键因素,研究了耐辐射奇球菌对Cu²⁺、Cr⁶⁺的吸附作用,找出最佳吸附条件,并研究了Cu²⁺、Cr⁶⁺共存条件下的竞争吸附行为。采用紫外分光光度计分析耐辐射奇球菌在不同条件下对Cu²⁺和Cr⁶⁺的吸附作用;傅立叶红外光谱（FTIR）和扫描电镜（SEM）分析细菌吸附前后的结构和形貌变化。结果表明:耐辐射奇球菌对Cu²⁺和Cr⁶⁺的最佳吸附时间均为80min。对Cu²⁺、Cr⁶⁺吸附的最佳初始浓度分别为0.08mol·L^-1、0.138mol·L^-1,且随着菌液浓度的增大,耐辐射奇球菌对Cu²⁺、Cr⁶⁺的吸附量随之增加。当Cu²⁺、Cr⁶⁺共存条件下耐辐射奇球菌对Cu²⁺吸附量较Cr⁶⁺更大。红外光谱仪和扫描电镜结果阐释了耐辐射奇球菌对Cu²⁺和Cr⁶⁺的吸附行为。耐辐射奇球菌以其超强生存能力,非致病性,环境友好等优势,在重金属废水处理方面将会有很好的应用前景。更多还原

【Abstract】 In this article,Deinococcus radiodurans was used as biosorbent to remove Cu²⁺and Cr⁶⁺from aqueous solution.The key influencing factors including adsorption time,initial ion concentration and concentration of fluid were observed to investigate the adsorption ability of Deinococcus radiodurans.We also investigate the optimum adsorption conditions and identify the competitive adsorption behavior.UV spectrophotometer was used to analyze the adsorption efficiency in different conditions.Fourier Transform infrared spectroscopy（ FTIR） and scanning electron microscopy（ SEM） were used to analyze the structure and morphology changes of bacteria before and after adsorption.The results showed that the optimum adsorption time of Cu²⁺and Cr⁶⁺was 80 min.The optimum initial concentrations of Cu²⁺and Cr⁶⁺were 0. 08 mol·L^-1 and 0. 138 mol·L^-1,respectively.With the increased concentration of Deinococcus radiodurans,the adsorptive capacity of Cu²⁺and Cr⁶⁺were increased simultaneously. Competition research showed that Cu²⁺was adsorbed more strongly on the biomass than Cr⁶⁺. The adsorption behavior of Cu²⁺and Cr⁶⁺was demonstrated by Fourier Transform infrared spectroscopy and scanning electron microscopy. Deinococcus radiodurans showed potential application in wastewater treatment because of its strong survival ability,non-pathogenic and environment friendly.更多还原