NiO催化臭氧氧化降解水中双酚A的研究

Degradation of bisphenol A in water by NiO catalytic ozonation

采用均匀沉淀法制备NiO催化剂催化臭氧氧化降解水中双酚A,并利用XRD、SEM、BET及孔径分析等表征手段对催化剂结构和性质进行表征.研究不同p H、臭氧流量、催化剂投加量、反应时间等因素对双酚A降解效果的影响.结果表明,制备的NiO催化剂成絮状结构,催化剂表面蓬松且粗糙,催化剂比表面积较大,且成介孔结构,在催化反应中可提供较多的反应活性位点.在初始p H值为6,臭氧流量为10 mg/min,催化剂投加量为1.0 g/L,反应时间为75 min条件下,双酚A初始浓度为100 mg/L时其降解率达95.3%.叔丁醇抑制实验表明,NiO催化臭氧氧化降解水中双酚A主要为催化剂催化O3分解产生·OH间接氧化.

Using NiO prepared by homogeneous precipitation as catalysts to catalytic ozonation for oxidizing bisphenol A in water, and the structure and properties of the catalysts were characterized by XRD, SEM, BET and pore size analysis. The affecting factors such as pH, ozone flow, dosage of catalysts and reaction time on the treatment effect were investigated. The experimental results show that NiO catalyst has a flocculent structure, and the catalyst surface is fluffy and rough. The catalyst has flocculent structure, a fluffy and coarse surface, larger specific surface area with mesoporous structure, which can provide active sites in the reaction. Catalyst has a large specific surface area and a mesoporous structure, which can provide more reactive sites in the catalytic reaction. When the pH solution was 6, ozone flow 10 mg/min, dosage of catalysts 1.0 g/ L, reaction time 75 minutes and the initial concentration of bisphenol A 100 mg/ L, the degradation efficiency was 95.3 % . Tert-butyl alcohol inhibition experiment indicates that the mechanism of NiO catalytic ozonation for oxidizing bisphenol A in water is mainly hydroxyl radicals produced by ozone＊s decomposition.