科研之友
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摘要
Alkaline residue, a common solid waste from the Lianyungang Soda Plant, China, was, respectively, modified by FeCl3.6H(2)O (FeCAR) and MnSO4.H2O (MnCAR) for arsenate adsorption. The specific surface areas and morphologies of FeCAR and MnCAR were determined by BET and SEM methods. The adsorption properties including adsorption kinetics, isotherms, and thermodynamics were investigated in depth. The experimental data were analyzed by different kinetic and isotherm models, and the results showed that for both FeCAR and MnCAR, the pseudo-second-order kinetic model was the best-fit model for describing the adsorption process while the Langmuir isotherm model provided the best fit to the equilibrium data. The maximum adsorption capacity calculated from the Langmuir equation was 44.4 mg/g for FeCAR and 22.6 mg/g for MnCAR, which were greater than other low-cost materials. The positive value of Delta H degrees indicated that the arsenate adsorption on adsorbents was endothermic, which was supported by the increasing adsorbed amount of arsenate with temperature. The positive value of Delta S degrees reflected good affinity of arsenate toward the modified alkaline residue. Overall, alkaline residue modified by iron or manganese was a very promising alternative adsorbent for removing arsenate from groundwater.
- 出版日期2016-9
- 单位广东省环境科学研究院; 南京理工大学
