固定化黑曲霉活性炭吸附铀的机理
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摘要
采用海藻酸钠包埋黑曲霉及活性炭粉末的方法制备固定化黑曲霉活性炭微球,利用静态吸附试验研究铀溶液的p H值、初始铀浓度、吸附时间、黑曲霉粉末与活性炭粉末质量的配比及固定化黑曲霉活性炭微球的投加量等因素对其吸附铀的影响。通过对动力学模型、等温吸附模型进行拟合,研究固定化黑曲霉活性炭吸附铀的行为。采用扫描电镜、能谱仪和红外光谱仪分析吸附前后固定化黑曲霉活性炭微球表面的形貌、化学组成和官能团结构的变化,进而探讨吸附过程可能涉及的反应机理。结果表明:固定化黑曲霉活性炭吸附铀的最佳条件为p H值为5.0,铀初始浓度为1 mg/L,固定化黑曲霉活性炭微球投加量为0.3 g/L,9 h即达到吸附平衡,最大吸附量为691.7 mg/g。固定化黑曲霉活性炭吸附铀的过程符合准二级动力学模型,相关系数为0.9994;吸附等温线符合Freundlich和Langmuir等温线模型,相关系数分别为0.9875和0.9993,体现固定化黑曲霉活性炭对铀的吸附模式是以单层吸附为主与多层吸附的共同作用的吸附模式。
Immobilizing Aspergillus niger activated carbon was made from Aspergillus niger and activated carbon by embedding with the Na-alginate. The effects of p H, initial concentration of uranium, contact time, the mass ratio of Aspergillus niger powder and activated carbon powder and the dosage on the biosorption of uranium from aqueous solutions by immobilizing Aspergillus niger activated carbon were investigated. The biosorption performances of the immobilizing Aspergillus niger activated carbon for uranium(Ⅵ) were investigated by correlating the experimental datas with the kinetic models and isothermal models. The surface morphology, chemical composition, functional groups and the possible mechanism were analyzed for the immobilizing Aspergillus niger activated carbon before and after biosorption treatment by using SEM, EDS and FTIR. The results show that the best conditions of adsorption of uranium for immobilized Aspergillus niger activated carbon are that p H of 5.0, initial uranium concentration of 1 mg/L, the adsorbent dosage 0.3 g/L. The adsorption equilibrium reaches at 9 h, and the maximum adsorption quantity is 691.7 mg/g. The adsorption process of uranium(Ⅵ) of immobilized Aspergillus niger activated carbon is in accordance with the pseudo-second-order kinetics model,the correlation coefficient is 0.9994. The isothermal model is in accordance with Langmuir and Freundlich models. The correlation coefficients are 0.9993 and 0.9875, which indicating that the adsorption of uranium(Ⅵ) of the immobilized Aspergillus niger activated carbon mainly depends on the combined effect of both monolayer and multilayer adsorption model.
Immobilizing Aspergillus niger activated carbon was made from Aspergillus niger and activated carbon by embedding with the Na-alginate. The effects of p H, initial concentration of uranium, contact time, the mass ratio of Aspergillus niger powder and activated carbon powder and the dosage on the biosorption of uranium from aqueous solutions by immobilizing Aspergillus niger activated carbon were investigated. The biosorption performances of the immobilizing Aspergillus niger activated carbon for uranium(Ⅵ) were investigated by correlating the experimental datas with the kinetic models and isothermal models. The surface morphology, chemical composition, functional groups and the possible mechanism were analyzed for the immobilizing Aspergillus niger activated carbon before and after biosorption treatment by using SEM, EDS and FTIR. The results show that the best conditions of adsorption of uranium for immobilized Aspergillus niger activated carbon are that p H of 5.0, initial uranium concentration of 1 mg/L, the adsorbent dosage 0.3 g/L. The adsorption equilibrium reaches at 9 h, and the maximum adsorption quantity is 691.7 mg/g. The adsorption process of uranium(Ⅵ) of immobilized Aspergillus niger activated carbon is in accordance with the pseudo-second-order kinetics model,the correlation coefficient is 0.9994. The isothermal model is in accordance with Langmuir and Freundlich models. The correlation coefficients are 0.9993 and 0.9875, which indicating that the adsorption of uranium(Ⅵ) of the immobilized Aspergillus niger activated carbon mainly depends on the combined effect of both monolayer and multilayer adsorption model.
引文
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[7]陈华柏,谢水波,刘金香,肖拾红,曾涛涛,凌辉,王劲松.厌氧颗粒污泥吸附铀(Ⅵ)的特性与机理[J].中国有色金属学报,2014,24(9):2418-2425.CHEN Hua-bai,XIE Shui-bo,LIU Jin-xiang,XIAO Shi-hong,ZENG Tao-tao,LING Hui,WANG Jin-song.Characteristics and mechanism of uranium(Ⅵ)absorbed by anaerobic granular sludge[J].The Chinese Journal of Nonferrous Metals,2014,24(9):2418-2425.
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[17]WANG J S,HU X J,LIU Y G,XIE S B,BAO Z L.Biosorption of uranium(Ⅵ)by immobilized Aspergillus fumigatus beads[J].Journal of Environmental Radioactivity,2010,101(6):504-508.
[18]林海,周闪闪,董颖博,许晓芳.固定化生物活性炭对矿山酸性废水中Zn2+的吸附性能[J].东北大学学报(自然科学版),2013,34(9):1352-1356.LIN Hai,ZHOU Shan-shan,DONG Ying-bo,XU Xiao-fang.Immobilized biological activated carbon on adsorption properties of Zn2+in the acidic mining waste water[J].Journal of North Eastern University(Natural Science Edition),2013,34(9):1352-1356.
[19]AKTAS O,CECEN F.Adsorption,desorption and bioregeneration in the treatment of chlorophenol with activated carbon[J].Journal of Hazardous Materials,2007,141(3):769-777.
[20]PANG C,LIU Y H,CAO X H,LI M,HUANG G L,HUA R,WANG C X,LIU Y T,AN X F.Biosorption of uranium(Ⅵ)from aqueous solution by dead fungal biomass of Penicillium citrinum[J].Chemical Engineering Journal,2011,170(1):1-6.
[21]王永东,李广悦,史文革,胡南,潘文俊,周支香,邓钦文,丁德馨.浸铀真菌的分离和纯化研究[J].南华大学报(自然科学版),2010,24(4):33-35.WANG Yong-dong,LI Guang-yue,SHI Wen-ge,HU Nan,PAN Wen-jun,ZHOU Zhi-xiang,DENG Qin-wen,DING De-xin.The separation and purification of leaching uranium fungi study[J].Journal of South China University(Natural Science Edition),2010,24(4):33-35.
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