Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
J Hazard Mater. 2013 Apr 15;250-251:370-8. doi: 10.1016/j.jhazmat.2013.02.007. Epub 2013 Feb 16.
The heterogeneous photocatalysis using UV-radiation and quantum dots (QDs) is an interesting method for the treatment of water polluted with the organic substances. In this study, ZnS QDs, as a pure and doped with Fe(3+), were prepared for photodecolorization of malachite green (MG) as a model dye. The synthesis of QDs was carried out using a chemical precipitation method in aqueous solution, in the presence of 2-mercaptoethanol as a capping agent. The XRD patterns indicated that the doped nanoparticles are crystalline, with cubic zinc blend structure. The effects of dopant content, pH, nanophotocatalyst amount, irradiation time, and initial dye concentration on the removal efficiency of MG were studied. Results showed that the QDs presented high MG decolorization efficiency, and doping with Fe(3+) promoted the dye removal. The maximum removal of dyes was obtained at 80 mg/L of photocatalyst as an optimum value for the dosage of photocatalyst in pH of 8.0.
利用紫外线辐射和量子点（QDs）进行多相光催化是处理有机物质污染水的一种有趣方法。在这项研究中，制备了 ZnS QDs，作为纯的和掺杂 Fe(3+)的 QDs，用于孔雀石绿（MG）作为模型染料的光褪色。QDs 的合成是在水溶液中使用化学沉淀法，以 2-巯基乙醇作为封端剂进行的。XRD 图谱表明，掺杂的纳米粒子是结晶的，具有立方锌混合结构。研究了掺杂含量、pH 值、纳米光催化剂用量、照射时间和初始染料浓度对 MG 去除效率的影响。结果表明，QDs 对 MG 具有很高的脱色效率，并且掺杂 Fe(3+)促进了染料的去除。在 pH 值为 8.0 时，最佳的催化剂用量为 80mg/L，催化剂的最大去除率为 80mg/L。
