Synthesis of manganese oxides for adsorptive removal of ammonia nitrogen from aqueous solutions
Synthesis of manganese oxides for adsorptive removal of ammonia nitrogen from aqueous solutions
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用于吸附去除水溶液中氨氮的氧化锰的合成
DOI：
10.1016/j.jclepro.2020.123055
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发表时间：
2020-07
影响因子：
11.1
通讯作者：
Fu Zishi
中科院分区：
文献类型：
--
作者：
Zhang Lei;Wang Junli;Qiao Hongxia;Liu Fuxing;Fu Zishi
近年来，锰氧化物在污染治理中得到了广泛的应用，但作为氨氮吸附剂的研究还未见报道。采用KMnO_4和MnSO_4氧化还原反应制备的合成锰氧化物（MnO_3）去除水溶液中的氨氮。探讨了MnSO 4/KMnO 4的相对配比对产率、组成及NH3-N去除率的影响，以获得最佳的吸附剂。本文介绍了XPS、Zeta电位和FTIR等多种表征方法。研究了初始pH值、反应时间、共存阳离子和环境温度等因素对MnOs去除NH3-N的影响。介绍了几种动力学和等温模型对实验数据进行拟合，并应用于MnO去除NH3-N的机理研究。结果表明，当MnSO 4/KMnO 4为1：1时，氧化还原反应生成的氧化锰去除率最高，但产率较低。Mn（Ⅱ）的过量存在会降低NH3-N的去除率。初始pH值在6-8范围内有利于吸附NH3-N，pH = 6时吸附量最大。共存阳离子对NH3-N去除的影响顺序为Ca 2 +> K+> Mg 2 +> Na+，升高温度可促进NH3-N的去除。NH3-N吸附过程采用准二级动力学和Langmuir拟合模型。静电相互作用和羟基与NH 4+的离子交换是主要的去除机理。锰氧化物具有制备工艺简单、吸附速度快、吸附容量大等优点，有望成为治理水体氨氮污染的理想材料。
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 KMnO4and MnSO4were used to remove NH3–N from aqueous solution. The influence of relative ratio of MnSO4/KMnO4on 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/KMnO4set as 1:1 exhibited the highest removal despite the lower yield. The presence of superabundant Mn (Ⅱ) covering the surface of nascent MnO2would 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+> Mg2+> 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.
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影响因子：
6.6
作者：
Zhang, Xiong;Sun, Xianzhong;Zhang, Haitao;Zhang, Dacheng;Ma, Yanwei
通讯作者：
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DOI：
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发表时间：
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期刊：
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作者：
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