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Synthesis of manganese oxides for adsorptive removal of ammonia nitrogen from aqueous solutions

文献类型： 外文期刊

作者： Zhang, Lei 1 ; Wang, Junli 1 ; Qiao, Hongxia 1 ; Liu, Fuxing 1 ; Fu, Zishi 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

2.Shanghai Engn Res Ctr Low Carbon Agr SERCLA, Shanghai 201415, Peoples R China

关键词： Synthetic manganese oxide; Ammonia nitrogen; Adsorption; Wastewater treatment

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：9.297； 五年影响因子：9.444 ）

ISSN： 0959-6526

年卷期： 2020 年 272 卷

页码：

收录情况： SCI

摘要： In recent years, manganese oxides have been widely applied in pollution control, but not found to be used as NH3-N adsorbent. In this study, synthetic manganese oxides (MnOs) prepared from the redox reaction between KMnO4 and MnSO4 were used to remove NH3-N from aqueous solution. The influence of relative ratio of MnSO4/KMnO4 on the yield, composition and NH3-N removal was discussed for obtain the optimal adsorbent. Several characterization methods including XPS, Zeta potential, and FTIR, were introduced in this study. Removal of NH3-N by MnOs under various environmental factors, such as initial pH, reaction time, coexisting cations and ambient temperature with different levels, was investigated subsequently. A few of kinetics and isotherm models were introduced to fit the experimental data, which were applied to figure out the NH3-N removal mechanism for MnOs. The results indicated that manganese oxide derived from the redox reaction with the ratio of MnSO4/KMnO4 set as 1:1 exhibited the highest removal despite the lower yield. The presence of superabundant Mn (II) covering the surface of nascent MnO2 would reduce NH3-N removal. The initial pH range of 6-8 is beneficial to the adsorption of NH3-N and the highest adsorption capacity would occur at pH - 6. The influence of coexisting cations on NH3-N removal follows an order of Ca2+ > K+ > Mg-2 + > Na+ , and raising temperature can promote the elimination of NH3-N. Pseudo-second-order kinetics and Langmuir fitting models were used for describing NH3-N adsorption process. The electrostatic interaction and ion exchange between hydroxyl and NH4+ were the dominant removal mechanism. Manganese oxides were expected to be promising for the control of NH3-N pollution in water bodies due to simple preparation procedure, rapid adsorption process and higher adsorption capacity. (C) 2020 Elsevier Ltd. All rights reserved.

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