基于光催化载体构筑的硫化矿选矿废水中黄药的降解机制研究

Xanthate is a common collector for flotation of metal sulfide ore. And the residual xanthate in the floatation wastewater will pollute the water. Photocatalysis is one of the effective methods to degrade the organic pollutants in the flotation wastewater. This project uses xanthate as the reaction model, and uses iron oxide as the component and diatomite as the carrier to prepare the diatomite-based iron oxide composite catalyst. And then optimize the spatial structure of composite materials, in situ preparation of unit (multicomponent) iron oxide / diatomite catalyst, and use the compound catalyst to degrade the xanthate in the floatation wastewater under visible light conditions. The effect mechanism of diatomite surface regulation on the surface structure performance improvement of diatomite will be established. To clarify the coordination principle of diatomite functional parameters and iron oxide loaded. The relationship between the parameters of diatomite carried iron oxide composite catalyst and the selectivity of degradation products of xanthate was established. The synergistic mechanism of diatomite surface action and iron oxide configuration on the degradation of xanthate was discussed. The photocatalytic degradation mechanism of composite materials to xanthate will be analyzed from the micro level of electron, atom and molecule.

黄药是金属硫化矿浮选的常用捕收剂，常残留在浮选废水中，易对水体产生污染。光催化法是降解选矿废水中有机污染物的有效手段之一。本项目以黄药为反应模型，以铁氧化物为组元、硅藻土为载体制备硅藻土基铁氧化物复合催化剂。通过对复合催化材料进行空间结构优化，原位制备单元（多元）铁氧化物/硅藻土高效复合催化剂，并在可见光条件下考察复合催化剂对浮选废水中黄药降解效果的影响。建立硅藻土表面微调控对硅藻土表面结构性能提升的影响机制，明确适宜的硅藻土功能化参数与铁氧化物负载配位原则，构建铁氧化物复合催化剂构型参数与黄药降解产物选择性的关系模型，探讨硅藻土表面作用与铁氧化物构型对黄药降解的协同强化作用机制，从电子、原子及分子等微观层面剖析复合材料对黄药光催化降解机理，为硅藻土基铁氧化物复合催化剂在选矿废水治理的应用奠定理论和实践基础。

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