吸附树脂负载锰氧化物去除水中镉和铜

以大孔吸附树脂SD300为载体, 采用原位高锰酸钾氧化还原法将锰氧化物负载其上, 制备了新型锰氧化物?吸附树脂复合材料Mn-SD300, 并对其吸附水中Cd²⁺和Cu²⁺的性能进行了研究。TEM, XRD以及XPS的分析结果表明, 负载的锰氧化物以MnO₂的形态存在。静态吸附实验结果表明Mn-SD300对Cd²⁺和Cu²⁺具有良好的吸附性能。吸附行为均符合准一级动力学模型(R²>0.99)和Langmuir吸附等温线模型(R²>0.99), 温度为303 K时, Mn-SD300对Cd²⁺和Cu²⁺的饱和吸附容量可分别达到76.92 mg/g和142.86 mg/g。在高浓度竞争离子Ca²⁺, Mg²⁺和Na⁺共存的情况下, Mn-SD300对Cd²⁺和Cu²⁺的吸附选择性要强于传统阳离子交换树脂D001。

Removal of Cadmium and Copper from Aqueous Solution by the Adsorption Resin Coated Manganese Oxide

A new hybrid material (Mn-SD300) was prepared by coating manganese oxide onto the adsorption resin SD300, which adopted the method of in-suit potassium permanganate oxidation and reduction. The adsorption ability of Mn-SD300 for Cd²⁺ and Cu²⁺ was studied. The results of TEM, XRD and XPS demonstrated that the form of manganese oxide loaded on the resin was MnO₂. A good adsorption property of Cd²⁺ and Cu²⁺ onto Mn-SD300 was indicated by the batch experiments. The adsorption behavior of Cd²⁺ and Cu²⁺ on Mn-SD300 was well described by pseudo-first-order kinetic model and Langmuir isotherm model (R²>0.99), and the maximum adsorption capacity of Mn-SD300 towards Cd²⁺ and Cu²⁺, were up to 76.92 mg/g and 142.86 mg/g respectively at 303 K. Compared to the conventional cation exchange resin D001, Mn-SD300 had a better adsorption selectivity to Cd²⁺ and Cu²⁺, when Ca²⁺, Mg²⁺ and Na⁺ coexisted at high concentration.