作者机构：
[Xia, Yiqun; Zheng, Weina; Li, Reirei; Xia, Liangshu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Xia, Yiqun] China Inst Atom Energy, Dept Radiochem, POB 275-26, Beijing 102413, Peoples R China.;[Tans, Kaixuan] Univ South China, Sch Nucl Resource & Nucl Fuel Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xia, Liangshu] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
摘要：
Basic aspects of uranium adsorption by rice husk have been investigated. The influences of various experimental parameters such as pH, time, adsorbent dosage, rice husk size, temperature and various concentrations of uranium on uptake were evaluated. The thermodynamics and kinetics of adsorption were analyzed by FT-IR and SEM. The adsorption capacity for uranium on rice husk increased upon increasing initial concentration of uranium and temperature, while decreased with the increase of the amount of rice husk. Maximum uranium adsorption was observed at pH = 3 and particle size between 120 μm and 150 μm. Adsorption equilibrium was achieved within 60 min. At 25 °C, the saturated adsorption capacity qmax was up to 15.14 mg/g when the initial concentration of uranium ranged from 10 to 400 mg/dm<sup>3</sup>. The adsorption of uranium followed Langmuir adsorption isotherm and according to quasi-second order kinetic equation. The calculated values of δH<sup>o</sup>, δS<sup>0</sup>, and δG<sup>o</sup>indicated that the biosorption process was endothermic and spontaneous. Based on FT-IR spectra it may be concluded that hydroxyl, carbonyl, P-O and Si=O groups are the main active sites.<br/>
作者机构：
[陈亮] School of Resource Environment and Safety Engineering, University of South China, Hengyang;421001, China;[刘江; 刘珊; 黄伟; 王正庆; 谢焱石; 唐振平] Hengyang Key Laboratory of Geological Theory and Technology for Nuclear Fuel Cycle, Hengyang;[夏良树] Post-doctoral Research Station, School of Nuclear Science and Technology, University of South China, Hengyang;[陈亮] 421001, China <&wdkj&> Hengyang Key Laboratory of Geological Theory and Technology for Nuclear Fuel Cycle, Hengyang
通讯机构：
Post-doctoral Research Station, School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[张晓腾; 郝帅; 唐菲菲; 夏良树] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[何博] School of Chemistry and Chemical Engineering, University of South China, Hengyang;[蒋冬梅] School of Innovation and Entrepreneurship, University of South China, Hengyang;[张晓腾; 郝帅; 何博; 蒋冬梅; 唐菲菲; 夏良树] 421001, China
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[李春光; 谭凯旋] School of Nuclear Resources Engineering, University of South China, Hengyang, 421001, China;[夏良树] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[刘振中] School of Environmental Protection and Safety Engineering, University of South China, Hengyang, 421001, China
作者机构：
[张晓腾; 郝帅; 夏良树] .School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[李斌; 周贤明; 刘利生] Department of Radiochemistry, China Institute of Atomic Energy, Beijing;102413, China;[蒋冬梅] School of Innovation and Entrepreneurship, University of South China, Hengyang
通讯机构：
.School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[陈俊畅; 张晓腾; 郝帅; 夏良树] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[李广] School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China;[蒋冬梅] School of Innovation and Entrepreneurship, University of South China, Hengyang, 421001, China
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[郝帅; 张晓腾; 夏良树] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[李斌; 周贤明; 刘利生] .China Institute of Atomic Energy, P. O. Box 275-88, Beijing;102413, China;[蒋冬梅] School of Innovation and Entrepreneurship, University of South China, Hengyang
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
作者机构：
[谭凯旋; 李春光; 谭婉玉] School of Nuclear Resources Engineering, University of South China, Hengyang, 421001, China;[夏良树] School of Nuclear Science and Technology, University of South China, Hengyang, 421001, China;[刘振中] School of Environmental Protection and Safety Engineering, University of South China, Hengyang, 421001, China
通讯机构：
School of Nuclear Resources Engineering, University of South China, Hengyang, China
摘要：
In this work, a facile method was adopted to synthesize molybdenum disulfide/reduced graphene oxide (MoS_2/rGO) composites through an L-cysteine-assisted hydrothermal technique. The as-prepared MoS_2/ rGO composites were firstly applied as adsorbents for efficient elimination of Pb(II) ions. Batch adsorption experiments showed that the adsorption of Pb(II) on MoS_2/rGO followed pseudo-second-order kinetic model well. The adsorption of Pb(II) was intensely pH-dependent, ionic strength-dependent at pH < 9.0 and ionic strength-independent at pH > 9.0. The presence of humic acid (HA) enhanced Pb(II) adsorption obviously. The MoS_2/rGO composites exhibited excellent adsorption capacity of 384.16 mg g~(-1) at pH 5.0 and T=298.15 K, which was superior to MoS_2 (279.93 mg g~(-1)) and many other adsorbents. The thermodynamic parameters suggested that the adsorption process of Pb(II) on MoS_2/rGO composites was spontaneous (?G~θ < 0) and endothermic (?H~θ > 0). The interaction of Pb(II) and MoS_2/ rGO was mainly dominated by electrostatic attraction and surface complexation between Pb(II) and oxygen-containing functional groups of MoS_2/rGO. This work highlighted the application of MoS_2/rGO as novel and promising materials in the efficient elimination of Pb(II) from contaminated water and industrial effluents in environmental pollution management.
