过渡金属催化剂Co_(x)Ni_(1-x)TiO_(3)活化过硫酸盐去除水中污染物的综合实验设计

Comprehensive Experimental Design of Transition Metal Catalyst Co_(x)Ni_(1-x)TiO_(3)Activated Persulfate for Removal of Pollutants From Water

基于过一硫酸盐(PMS)的高级氧化技术具有高效、环境友好等特点,因此该技术在水处理领域具有非常好的应用前景。通过利用过渡金属之间协同活化PMS的优势,采用乙二醇沉淀-煅烧法,制备了一系列不同Co/Ni比例的非均相催化剂Co_(x)Ni_(1-x)TiO_(3)。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了催化剂的物相和微观结构。同时考察了催化剂用量、PMS浓度、pH值以及催化剂的循环使用情况对降解污染物环丙沙星(CIP)的影响,最优条件为0.20 g/L Co_(0.7)Ni_(0.3)TiO_(3)、0.5 mmol/L的PMS和pH=6时,60 min内降解CIP的效率达90.01%。通过自由基猝灭实验,证实了SO_(4)^(·-)是高级氧化降解过程中的主要活性物种。

The advanced oxidation technology based on persulfate(PMS)has the characteristics of high efficiency and environmental friendliness,which has a very good application prospect in the field of water treatment.A series of heterogeneous catalysts Co_(x)Ni_(1-x)TiO_(3)with different Co/Ni ratios were prepared by using the method of glycol precipitation-calcination by taking advantage of the synergistic activation of PMS among transition metals.The phase and microstructure of the catalyst were analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).At the same time,the effects of catalyst dosage,PMS concentration,pH value and catalyst recycling on the degradation of Ciprofloxacin(CIP)were investigated.The optimal conditions were 0.20 g/L Co_(0.7)Ni_(0.3)TiO_(3),0.5 mmol/L PMS and pH=6.The efficiency of CIP degradation was 90.01%within 60 min.The experiment of free radical quenching confirmed that SO_(4)^(·-)is the main active species in the process of advanced oxidative degradation.