Institute on Membrane Technology, ITM-CNR, Via P. Bucci Cubo 17/C, 87030 Rende (CS), Italy.
J Hazard Mater. 2012 Apr 15;211-212:281-7. doi: 10.1016/j.jhazmat.2011.11.023. Epub 2011 Nov 11.
PEEK-WC nanostructured capsules were prepared by the phase inversion technique and used as support for the coating of a manganese dioxide layer. The coating was done by a chemical treatment of the capsules followed by a thermal one. The presence of the MnO(2) layer was confirmed by scanning electron microscopy (SEM), back scattering electron (BSE), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. The produced capsules were, then, tested for As(III) oxidation in batch. The experiments consisted in treating 165 ml of As(III) solution with 1g of coated capsules at fixed temperature (15°C) and pH (5.7-5.8). In particular, the efficiency of the system was investigated for different As(III) concentrations (0.1, 0.3, 0.7 and 1 ppm). For feeds at lower As(III) content (0.1-0.3 ppm), tests lasted for 8h, while prolonged runs (up to 48 h) were carried out on more concentrated solutions (0.7 and 1 ppm). The produced capsules were able to oxidize As(III) into As(V) leading to complete conversion after 3 and 4h for feed concentrations of 0.1 and 0.3 ppm, respectively.
PEEK-WC 纳米胶囊通过相转化技术制备，并用作二氧化锰层涂层的支撑物。通过对胶囊进行化学处理和随后的热处理来完成涂层。通过扫描电子显微镜 (SEM)、背散射电子 (BSE)、能谱 X 射线 (EDX) 和 X 射线衍射 (XRD) 分析证实了 MnO(2)层的存在。然后，对所制备的胶囊进行批量 As(III)氧化测试。实验包括在固定温度 (15°C) 和 pH (5.7-5.8) 下，用 1g 涂覆胶囊处理 165ml 的 As(III)溶液。特别地，研究了不同 As(III)浓度 (0.1、0.3、0.7 和 1 ppm) 对系统效率的影响。对于较低 As(III)含量 (0.1-0.3 ppm) 的进料，测试持续 8 小时，而对于浓度较高的溶液 (0.7 和 1 ppm) 则进行了延长运行 (长达 48 小时)。所制备的胶囊能够将 As(III)氧化为 As(V)，对于进料浓度分别为 0.1 和 0.3 ppm 的溶液，分别在 3 和 4 小时后实现完全转化。
