MgO催化臭氧氧化降解苯酚机理研究  

Study on mechanism of MgO catalytic ozonation process for phenol degradation

作　　者：王兵[1,2] 周鋆[1] 任宏洋[1,2] 张悦[1] 刘璞真 

机构地区：[1]西南石油大学化学化工学院,成都610500 [2]中国石油HSE重点实验室西南石油大学研究室,成都610500

出　　处：《环境科学学报》2016年第11期4009-4016,共8页Acta Scientiae Circumstantiae

基　　金：长宁-威远页岩气开发示范工程项目(No.2016ZX05062)~~

摘　　要：对氧化镁(MgO)催化臭氧氧化降解苯酚的机理进行了探讨,并验证其与现有的3种催化臭氧氧化机理的吻合性.同时,研究了羟基自由基(·OH)抑制剂对苯酚去除效果的影响,·OH的产生量,以及臭氧在该体系中的存在位置及苯酚在该体系中的作用.结果表明,O_3和MgO/O_3两种反应体系中都存在·OH,MgO/O_3体系中的·OH是O_3体系中的2.14倍.O_3和MgO/O_3体系中的·OH与臭氧浓度的比值分别为1.47×10^(-9)和3.15×10^(-9).苯酚在MgO催化臭氧氧化体系中起到了促进臭氧吸附在MgO表面的作用,臭氧吸附到MgO表面后,分解产生·OH,一部分释放在溶液中降解苯酚,一部分则留在其表面增加表面羟基密度.The reaction mechanism of MgO catalytic ozonation for phenol degradation was investigated by verifying their consistency with the existing three mechanisms. The effect of hydroxyl radical（ ·OH） inhibitor on phenol removal was discussed. At the same time,the yield of ·OH,the position of O_3 and the role of phenol in the system were also studied. The results indicated that the ·OH was present in both reaction systems of O_3 and MgO/O_3. The amount of ·OH in MgO/O_3 system was 2. 14 times of O_3 system. The concentration ratios of ·OH and ozone in O_3 and MgO/O_3 systems were 1. 47 ×10^（-9）and 3. 15 × 10^（-9）,respectively. Phenol played an important role in promoting the adsorption of ozone on the surface of MgO in MgO/O_3 system.Ozone was decomposed into ·OH when it was adsorbed on the surface of MgO. Then,some of ·OH was released into the solution to degrade phenol. And other was kept on the surface of MgO to increase the density of surface hydroxyl.

关 键 词：氧化镁 催化臭氧化 苯酚 机理 羟基自由基 

分 类 号：X703[环境科学与工程—环境工程]