期刊：
Journal of Environmental Radioactivity,2010年101(6):504-508 ISSN：0265-931X
通讯作者：
Wang, Jing-song
作者机构：
[Wang, Jing-song; Bao, Zheng-lei; Xie, Shui-bo; Hu, Xin-jiang] Univ S China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.;[Wang, Jing-song; Xie, Shui-bo] Univ S China, Hunan Key Lab Pollut Control & Resource Reuse, Henyang 421001, Hunan, Peoples R China.;[Liu, Yun-guo; Hu, Xin-jiang] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Wang, Jing-song] Univ S China, Sch Urban Construct, 28 W Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Jing-song] U;Univ S China, Sch Urban Construct, 28 W Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
会议名称：
9th International Conference on Biogeochemistry of Trace Elements
会议时间：
JUL, 2007
会议地点：
Beijing, PEOPLES R CHINA
会议主办单位：
[Wang, Jing-song;Hu, Xin-jiang;Xie, Shui-bo;Bao, Zheng-lei] Univ S China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.^[Wang, Jing-song;Xie, Shui-bo] Univ S China, Hunan Key Lab Pollut Control & Resource Reuse, Henyang 421001, Hunan, Peoples R China.^[Hu, Xin-jiang;Liu, Yun-guo] Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Immobilized beads;Aspergillus fumigatus;Biosorption;Uranium (VI);Pseudo-second order
摘要：
Biosorption of uranium (VI) ions by immobilized Aspergillus fumigatus beads was investigated in a batch system. The influences of solution pH, biosorbent dose, U (VI) concentration, and contact time on U (VI) biosorption were studied. The results indicated that the adsorption capacity was strongly affected by the solution pH, the biosorbent dose and initial U (VI) concentration. Optimum biosorption was observed at pH 5.0, biosrobent dose (w/v) 2.5%, initial U (VI) concentration 60 mg L-1. Biosorption equilibrium was established in 120 min. The adsorption process conformed to the Freunlich and Temkin isothermal adsorption models. The dynamic adsorption model conformed to pseudo-second order model. (C) 2010 Elsevier Ltd. All rights reserved.
摘要：
The adsorption capability of diatomite to reactive dyes (reactive black K-RB and reactive golden yellow X-G) in aqueous solution was studied, and adsorption mechanism was explored from the view point of kinetics. The results show that the equilibrium adsorption capacity (q(e)) of each dye increases with the temperature. On the same condition, the q(e) of reactive black is more than reactive golden yellow. The adsorption processes follow the pseudo second-order model, and the structure, size and functional groups of dyes are important factors to adsorption reaction. The dye adsorption isotherms fit well to Freundlich and Langmuir equation. The Freundlich equation 1/n between 0.3585 and 0.4411 indicates favorable adsorption. The adsorption activation energy of reactive black K-RB and reactive golden yellow X-G are 12.373 kJ/mol and 25.913 kJ/mol, respectively, which indicates that it belongs to physics adsorption. The main driving forces of adsorption are electrostatic attraction and van der waals force.
摘要：
Biosorption has been developed as an effective and economic method to treat wastewater containing low concentrations of metal pollutants. In this study, a bacterium, Citrobacter freudii, was used as a biosorbent to adsorb uranium ions. The thermodynamics and kinetics of this adsorption, as well as its mechanism, were investigated. The results indicated that the biosorption rate could be better described by a pseudo 2nd-order model than a pseudo 1st-order model. The adsorption of U (VI) proceeded very rapidly in the first 30 min and subsequently slowed down continuously for a long period. The biosorption isotherm of uranium by C. freudii could be described well by the Langmuir or Freundlich isotherm, and the latter was better. The thermodynamics parameters, Delta H degrees, Delta G degrees, and Delta S degrees were calculated according to the results of the experiment, which showed this biosorption as being endothermic and spontaneous. The authors investigated the active sites of bacteria for biosorption and the results proved that carboxyl in the cell wall played an important role in biosorption. (c) 2007 Elsevier Ltd. All rights reserved.
作者机构：
[张晓健; 谢水波] Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China;[陈泽昂; 吕俊文; 何少华; 谢水波] School of Urban Construction, Nanhua University, Hengyang 421001, China
通讯机构：
Department of Environmental Science and Engineering, Tsinghua University, China
作者机构：
[陈泽昂; 吕俊文; 谢水波; 王开华; 王清良] School of Architectural Engineering and Resources Environment, Nanhua University, Hengyang 421001, China;[张晓健; 谢水波] Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
通讯机构：
School of Architectural Engineering and Resources Environment, Nanhua University, China
摘要：
In order to search for the better biosorbent of uranium (VI) biosorption and its mechanism, Bacillus subtilis was employed in this research. The results showed that the adsorption capacity was achieved to 358.18 mg g-1 and with an optimum pH of 6.0. Cu2+, Fe2+, CO32- etc. would interfere with adsorption greatly. Better conformity of biosorption data with the Freundlich model suggested non-monolayered uranium biding. The adsorption results of the thermodynamic parameters indicated that biosorption of uranium were endothermic and spontaneous. TEM and SEM analysis of uranium loaded biomass revealed intracellular U sequestration and U absorbed on the cell surface respectively. It was confirmed that carboxyl, amino, and acylamino groups are responsible for biosorption using IR. More than 99％ of biomass-bound uranium was recovered using sodium carbonate and sodium bicarbonate.
