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中文摘要：
研究了以微波为热源,采用均匀沉淀法制备活性MgO,并用所制备的MgO去除溶液中的Th（Ⅳ）,考察了溶液pH、反应温度、接触时间、固液质量体积比、溶液中的Th钍初始质量浓度对Th（Ⅳ）去除效果的影响。结果表明：在pH=2.5、温度25℃、接触时间60 min、固液质量体积比0.15g/L、Th（Ⅳ）初始质量浓度50mg/L条件下,活性MgO对溶液中Th（Ⅳ）去除率达98.91%,去除效果较好;用少量活性MgO处理酸性含钍放射性废水即可取得很好的效果,经济环保、操作简单,具有较好的应用前景;推测活性MgO去除溶液中Th（Ⅳ）的机制为以化学沉淀为主,表面物理吸附为辅。
英文摘要：
Preparation of active magnesium oxide by microwave heating and homogeneous precipitation method was investigated,then remove Th（Ⅳ） from aqueous solution using the active MgO was also investigated. The effects of solution pH, temperature, contact time, solid-to-liquid ratio and initial concentrations of Th（Ⅳ） on removal of Th（Ⅳ） were examined,and the properties of active MgO were characterized. The result show that active MgO has very good removal efficiency for Th（Ⅳ） under the conditions of pH= 2. 5,60 min of contact time, 0. 15 g/L of solid-to-liquid ratio, 50 mg/L of initial concentration of Th（Ⅳ）,the highest removal rate reaches 98.91%. Using a small amount of the active MgO to treat acidic radioactive wastewater containing thorium can achieve very good effects with economic and environmental protection, simple operation. The mechanism of removal of Th（Ⅳ） by the active MgO is presumed to be mainly chemical precipitation,and secondly surface physical adsorption.
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