复合材料BiVO_4/ZnO光催化降解废水中的丁基黄药

针对选矿废水中残留的有毒有害丁基黄药,通过水热法制备出一种高效复合型光催化材料BiVO_4/ZnO。采用XRD、SEM和UV-Vis等对样品的结构、形貌和光学性质等进行了表征。在模拟太阳光照射下,考察了降解时间、BiVO_4与ZnO不同质量百分比的BiVO_4/ZnO和不同丁基黄药初始浓度等因素对光催化降解效果的影响。结果表明:(1)BiVO_4与ZnO按质量比25%复合的光催化材料BiVO_4/ZnO对丁基黄药模拟废水具有强降解效果;丁基黄药初始浓度越低、降解时间越长,丁基黄药的降解率越高;pH=7、初始浓度为50 mg/L的丁基黄药模拟废水50 mL,在复合光催化材料BiVO_4/ZnO用量为50 mg时的降解率为96.00%。(2)复合光催化材料BiVO_4/ZnO可循环用于丁基黄药的降解,丁基黄药的降解率几乎不受循环利用次数的影响。(3)复合光催化材料BiVO_4/ZnO对丁基黄药的降解行为符合一级反应动力学模型。

Degradation of Butyl Xanthate with Composite Photocatalytic Materials BiVO4/ZnO

A kind of efficient composite photocatalytic materials BiVO₄/ZnO had been prepared via hydrothermal method in order to address the toxic or harmful residual butyl xanthate in wastewater of mineral processing.X-ray diffraction (XRD)，scanning electron microscopy (SEM) and uv-vis diffuse reflection spectroscopy (UV-Vis) have been used to characterize the structure，morphology and optical properties of the sample.Under simulated solar light irradiation，the impact of various variables，including the degradation time，BiVO₄/ZnO with different quality ratio of BiVO₄ and ZnO and initial butyl xanthate concentration，on the butyl xanthate degradation were investigated.Results showed：① Composite photocatalytic materials BiVO₄/ZnO with the doping ratio of BiVO₄ as much as 25% the quality of ZnO have high degradation effect of butyl xanthate simulated wastewater；the lower initial concentration 、the longer degradation time，the higher degradation effect of butyl xanthate；the degradation efficiency of butyl xanthate of 50 mL reached 96.00% using photocatalytic materials BiVO₄/ZnO of 50 mg under the condition of the butyl xanthate initial concentration of 50 mg/L at pH=7.②Composite photocatalytic materials BiVO₄/ZnO can be reused in the degradation of butyl xanthate and the degradation efficiency is almost not influenced by recycling times.③The photocatalytic degradation of butyl xanthate by photocatalytic materials BiVO₄/ZnO followed the first-order kinetic model.