Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第4期    总第205期    2016年4月

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文章编号:1004-0609(2016)-04-0936-10
固定化黑曲霉活性炭吸附铀的机理
喻 清1, 2,丁德馨1, 2,李登科2,余园平2,罗 艺2,王启方2,胡 南2

(1. 中南大学 资源与安全工程学院,长沙 410083;
2. 南华大学 铀矿冶生物技术国防重点学科实验室,衡阳 421001
)

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pH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pH 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。

 

关键字: 固定化;黑曲霉;活性炭;吸附铀

Adsorption mechanism of uranium of immobilizing Aspergillus niger activated carbon
YU Qing1, 2, DING De-xin1, 2, LI Deng-ke2, YU Yuan-ping2, LUO Yi2, WANG Qi-fang2, HU Nan2

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Key Discipline Laboratory of Defense Biotechnology in Uranium Mining and Hydrometallurgy,
University of South china, Hengyang 421001, China

Abstract:Immobilizing Aspergillus niger activated carbon was made from Aspergillus niger and activated carbon by embedding with the Na-alginate. The effects of pH, 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 pH 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.

 

Key words: immobilizing; Aspergillus niger; activated carbon; uranium adsorption

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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