含钛高炉渣制光催化剂降解水中2,4-二氯酚的研究

以攀钢含钛高炉渣为原料制备了光催化剂,并将其用于降解水中2,4-二氯酚,研究了光催化剂投加量、光照强度、反应物浓度、反应时间对2,4-二氯酚降解率的影响。结果表明:高炉渣制光催化剂对2,4-二氯酚具有良好的光催化效果,在催化剂投加量为0.3g/L,光照时间为2h的条件下,浓度为50mg/L的2,4-二氯酚的降解率达到了77.1%。通过反应的动力学分析,确立出高炉渣制光催化剂对水中2,4-二氯酚的降解反应为一级反应。对2,4-二氯酚的光催化降解产物进行分析发现,苯环上的C—Cl键被光催化剂产生的羟自由基·OH氧化断裂,氯取代基成为游离Cl-存在于溶液中,2,4-二氯酚被·OH降解生成中间小分子有机产物,这些小分子有机物再进一步被光催化降解。

Degradation of 2,4-dichlorophenol with Photocatalyst Prepared by Ti-bearing Blast Furnace Slags

Photocatalyst was prepared by Ti-bearing blast furnace slags from Panzhihua Iron and Steel Company,Sichuan Province as raw materials and was used in degradation of 2,4-dichlorophenol,the effects of catalyst dosage,light intensity,reaction time on degradation of 2,4-dichlorophenol were studied.Results showed that photocatalyst prepared by Ti-bearing blast furnace slags has a better photocatalytic effect,with degradation rate up to 77.1% in concentration of 2,4-dichlorophenol 50mg/L under conditions of catalyst dosage 0.3g/L and illumination time of 2h.Through kinetic analysis of reaction Ti-bearing blast furnace slags on degradation rate of 2,4-dichlorophenol followed first-order reaction.Photocatalytic degradation of 2,4dichlorophenol products were found through analysis that C-Cl bond on benzene ring was oxidized and then fractured by hydroxyl radical from photocatalyst,Cl substitute became free Cl-existing in the solution,2,4-dichlorophenol was degraded by ·OH and generated intermediate product of small molecule organic,and small molecule organics were further degraded under photocatalysis.