Removal and recovery of uranium from aqueous solutions by Trichoderma harzianum
Removal and recovery of uranium from aqueous solutions by Trichoderma harzianum
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DOI：
10.1016/j.watres.2006.12.009
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发表时间：
2007-03-01
期刊：
影响因子：
12.8
通讯作者：
Khalid, Ahmad M.
中科院分区：
文献类型：
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作者：
Akhtar, Kalsoom;Akhtar, M. Waheed;Khalid, Ahmad M.
通过进行生物吸附-解吸试验，研究了本地分离的活菌和非活菌真菌（哈兹木霉）和藻类（RD256、RD257）对稀水溶液中铀的去除和回收。真菌对铀的生物吸附效果优于藻类。该过程高度依赖于pH值。在优化的实验参数下，T - harzianum对铀的最大吸附量为612 mg U g(-1)，而藻类菌株（RD256和RD257）对铀的最大吸附量分别为354和408 mg U g(-1)，远远高于市售树脂（dowx - sbr - p和IRA-400）。藻类对铀的生物吸附遵循Langmuir模型，而真菌对铀的生物吸附则表现出更为复杂的多层吸附现象，并遵循拟二级吸附动力学。质量平衡研究表明，在0.1 M盐酸条件下，T. harzianum的铀回收率为99.9%，RD2S6和RD257的铀回收率分别为97.1和95.3%，使无铀细胞生物量再生，有利于吸附-解吸循环，具有较好的经济可行性。(c) 2007 Elsevier Ltd.版权所有。
Removal and recovery of uranium from dilute aqueous solutions by indigenously isolated viable and non-viable fungus (Trichoderma harzianum) and algae (RD256, RD257) was studied by performing biosorption-desorption tests. Fungal strain was found comparatively better candidate for uranium biosorption than algae. The process was highly pH dependent. At optimized experimental parameters, the maximum uranium biosorption capacity of T harzianum was 612 mg U g(-1) whereas maximum values of uranium biosorption capacity exhibited by algal strains (RD256 and RD257) were 354 and 408 mg U g(-1) and much higher in comparison with commercially available resins (Dowex-SBR-P and IRA-400). Uranium biosorption by algae followed Langmuir model while fungus exhibited a more complex multilayer phenomenon of biosorption and followed pseudo-second-order kinetics. Mass balance studies revealed that uranium recovery was 99.9%, for T. harzianum, and 97.1 and 95.3% for RD2S6 and RD257, respectively, by 0.1 M Hydrochloric acid which regenerated the uranium-free cell biomass facilitating the sorption-desorption cycles for better economic feasibility. (c) 2007 Elsevier Ltd. All rights reserved.