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首页> 外文期刊>RSC Advances >Temperature effects on arsenate adsorption onto goethite and its preliminary application to arsenate removal from simulative geothermal water
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Temperature effects on arsenate adsorption onto goethite and its preliminary application to arsenate removal from simulative geothermal water

机译：温度对砷在针铁矿上吸附的影响及其在模拟地热水中脱砷的初步应用

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Laboratory batch experiments were conducted in order to assess the impacts of temperature on the performance of goethite in removing arsenate from water. All batch experiments were conducted at four temperatures (30, 50, 70 and 90 degrees C) and pH 4.6. The results showed that both the arsenic uptake rate and capacity were significantly enhanced with increasing temperature from 30 to 90 degrees C. The adsorption kinetics followed a pseudo-second-order model with coefficients of determination (R-2) all above 0.999. The process followed the Langmuir model, and several thermodynamic parameters were calculated. Arsenate adsorption was facilitated more under simulative geothermal water conditions than in RO (reverse osmosis) water. The crystalline structure of goethite was not changed after adsorption at various temperatures. XPS results showed a decrease in the content of iron hydroxyl groups, which demonstrated that arsenate adsorption onto goethite may be realised through the replacement of the iron hydroxyl group to form inner-sphere bidentate/monodentate complexes at pH 4.6.
机译：为了评估温度对针铁矿从水中去除砷酸盐的性能的影响，进行了实验室分批实验。所有批处理实验均在四个温度（30、50、70和90摄氏度）和pH 4.6下进行。结果表明，随着温度从30升高到90摄氏度，砷的吸收速率和容量均得到显着提高。吸附动力学遵循拟二阶模型，其测定系数（R-2）均高于0.999。该过程遵循Langmuir模型，并计算了几个热力学参数。在模拟地热水条件下，比在RO（反渗透）水中，砷的吸附更加容易。在各种温度下吸附后，针铁矿的晶体结构均未改变。 XPS结果表明，铁羟基含量降低，这表明砷酸根可通过置换铁羟基以形成pH 4.6的内球二齿/单齿复合物而吸附在针铁矿上。

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