BiFeO3柱撑膨润土机械活化改性及其类Fenton催化处理黄药选矿废水的研究

BiFeO3 pillared bentonite (BFO-PILB) will be activated by mechanical activation (MA), and the modified composite will be used as catalyst for Fenton-like reaction to treat the mineral processing wastewater containing xanthate. Based on the modification process of composite, the effects of controlling factor of MA on the physicochemical change and the catalytic property of composite will be summarized. The strengthening mechanism of catalytic activity of composite in Fenton-like reaction by MA will be scientifically clarified. The effects of coexisting ions in wastewater on the degradation of xanthate will be systematically studied, and the adsorption and the degradation for organic pollutants in the wastewater by modified composite will be explored in depth. The effects of competitive adsorption and degradation of organic pollutants on the mineralization of xanthate in wastewater will be found. The degradation pathway and mechanism for different organic pollutants in the mineral processing wastewater by Fenton-like reaction under the catalytic function of BFO-PILB composite will be analyzed scientifically. The Coupling mechanism between adsorption and catalytic degradation of organic pollutants by the modified composite will be analyzed. Moreover, dynamic and thermodynamic models of xanthate degradation will be established. Through the work mentioned above, the general theory in the modification of BFO-PILB composite by MA and its Fenton-like catalytic treatment of mineral processing wastewater containing xanthate will be gained. A composite with strong applicability and high catalytic property will be obtained, and Fenton-like technology of treatment of mineral processing wastewater containing xanthate will be acquired. The research has significance in science and application.

采用机械活化改性BiFeO3柱撑膨润土复合材料，并以改性复合材料类Fenton催化处理黄药选矿废水。在机械活化改性柱撑复合材料的工艺研究基础上，重点研究机械活化过程各控制因素对复合材料物化、催化性能的影响规律，科学阐明机械活化提高复合材料的类Fenton催化性能机理；系统研究黄药选矿废水中共存难免离子对黄药类Fenton催化降解影响，深入考察改性复合材料对废水中各主要有机污染物的吸附及催化降解，揭示实际废水有机污染物的竞争吸附与降解对黄药降解矿化的影响规律，明确各有机污染物降解路径与机理，解析复合材料对有机污染物吸附与催化降解的耦合机制，建立黄药的降解反应动力学、热力学模型。项目研究将获得机械活化改性BiFeO3柱撑膨润土及其类Fenton催化处理黄药选矿废水的一般性重要理论，实现复合材料的强应用性与高催化活性，解决黄药选矿废水速效类Fenton处理需求，研究具有重要的科学意义与应用价值。

广西壮族自治区膨润土资源丰富，储量巨大。立足广西区优势矿产资源膨润土，开发膨润土基类Fenton 非均相固体催化剂，并研究催化降解处理黄药选矿废水，具有重要的科学意义与实际价值。.利用溶胶凝胶法成功制备了铁酸铋柱撑膨润土复合材料，以光Fenton催化性能评价确定了复合材料最优制备工艺；根据不同制备条件下复合材料的物化性能表征分析，掌握了制备过程各因素对材料性能影响的规律；依据表征分析及实验考察结果，得到了反映复合材料形貌、可见光响应性能及光生电子分离性能、热稳定性等特征的相关知识；通过复合材料的吸附实验、pH适应性实验、沉降性实验、活性对比实验、应用重复性实验等，掌握了复合材料的应用性能特点，并揭示了铁酸铋柱撑膨润土复合材料的光Fenton催化活性作用的机理。开展了铁酸铋柱撑膨润土复合材料的机械活化改性研究，通过改性复合材料的光Fenton催化性能评价，得到了材料机械活化改性的最佳工艺，并根据不同机械活化条件下复合材料的表征分析，获得了机械活化各控制因素对改性复合材料物化、催化性能的影响规律，阐明了机械活化改性对复合材料催化性能提高的主要内因，掌握了铁酸铋柱撑膨润土的机械活化改性技术。以机械活化改性的铁酸铋柱撑膨润土复合材料为非均相催化剂，研究了光Fenton降解处理黄药废水，掌握了水处理各控制因素可见光Fenton降解黄药的影响规律，并通过UV-Vis、1H NMR、LC-MS、FT-IR、XPS等谱图的分析，揭示了黄药在该光Fenton反应体系的催化降解路径及机理，建立了体系中黄药的降解反应动力学模型。此外，通过对共存难免离子存在下的黄药降解研究，最终获得了共存难免离子对黄药降解影响的规律。.总之，项目研究掌握了BiFeO3柱撑膨润土制备及机械活化改性新方法，揭示了机械活化对复合材料的类Fenton催化活性提高的本质，获得了BiFeO3柱撑膨润土类Fenton处理黄药废水的有关理论与基础性数据，对上述有关技术的工业应用提供了基础性数据参考。