Catalytic oxidation effect of MnSO4 on As(III) by air in alkaline solution
Catalytic oxidation effect of MnSO4 on As(III) by air in alkaline solution
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碱性溶液中空气对MnSO4催化氧化As(III)的影响
DOI：
10.1016/j.jes.2022.05.042
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发表时间：
2022
影响因子：
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通讯作者：
Chengyong Jin
中科院分区：
文献类型：
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作者：
Yuhu Li;Yudong Yang;Ruixiang Wang;Zhifeng Xu;Guizhong Jin;Chengyong Jin
·MnSO4转化为Na0.55Mn2O4·1.5H2O，具有很强的催化氧化能力。·从碱性溶液中有效地将As(III)氧化为As(V)。·溶液的pH值对砷的氧化有显著影响。·As(III)的吸附和氧化同时发生。研究了碱性条件下空气中MnSO4对As(III)的催化氧化作用。X射线衍射仪(XRD)、扫描电子显微镜-能谱仪(SEM-EDS)和X射线光电子能谱(XPS)分析结果表明，在碱性好氧溶液中，以溶液形式引入MnSO4会生成具有较强催化氧化能力的Na0.55Mn2O4·1.5H2O，而以溶液形式引入的MnOOH催化效果不佳。在反应温度90℃、As/Mn摩尔比为12.74：1、空气流量为1.0 L/min、搅拌速度为300r/min的最佳反应条件下，反应2小时即可使As(III)完全氧化。MnSO4对As(III)具有良好的催化氧化能力，这主要归功于产物Na0.55Mn2O4·1.5H2O对As(III)的间接氧化。研究表明，在碱性溶液中氧化As(III)是一种简便有效的方法，对含砷溶液的预氧化或As(III)的解毒具有潜在的应用价值。
• MnSO 4 is transformed into Na 0.55 Mn 2 O 4 ·1.5H 2 O with strong catalytic oxidation ability. • As(III) is efficiently oxidized to As(V) from alkaline solution. • The pH value of the solution significantly affected the oxidation of arsenic. • Adsorption and oxidation of As(III) occurred simultaneously. The catalytic oxidation effect of MnSO 4 on As(III) by air in an alkaline solution was investigated. According to the X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and X-ray photoelectron spectroscopy (XPS) analysis results of the product, it was shown that the introduction of MnSO 4 in the form of solution would generate Na 0.55 Mn 2 O 4 ·1.5H 2 O with strong catalytic oxidation ability in the aerobic alkaline solution, whereas the catalytic effect of the other product MnOOH is not satisfactory. Under the optimal reaction conditions of temperature 90°C, As/Mn molar ratio 12.74:1, air flow rate 1.0 L/min, and stirring speed 300 r/min, As(III) can be completely oxidized after 2 hr reaction. The excellent catalytic oxidation ability of MnSO 4 on As(III) was mainly attributed to the indirect oxidation of As(III) by the product Na 0.55 Mn 2 O 4 ·1.5H 2 O. This study shows a convenient and efficient process for the oxidation of As(III) in alkali solutions, which has potential application value for the pre-oxidation of arsenic-containing solution or the detoxification of As(III).