摘要
对比了吉非罗齐(GEM)在UV/H_(2)O_(2)和UV/NaClO系统中的降解,两个高级氧化系统均可以有效降解GEM,与UV/H_(2)O_(2)相比,UV/NaClO对GEM的去除速率更快。在UV/H_(2)O_(2)和UV/NaClO系统内,目标物的降解速率随着氧化剂浓度的增加而加快,由于pH会影响OH的氧化能力和UV/NaClO系统内自由基的组成比例,因此溶液的p H对两个系统均有显著的影响,当溶液pH从5增加到11时,GEM在UV/H_(2)O_(2)系统和UV/NaClO系统内的k_(obs)分别从0.2115min^(-1)和1.3115min^(-1)降低到0.1064min^(-1)和0.2283min^(-1)。Cl^(-)和HCO_(3)^(-)可以稍微加快GEM在UV/NaClO系统内的降解速率,却减慢了GEM在UV/H_(2)O_(2)系统内的降解速率;HA可以通过竞争效应和滤光效应抑制GEM在两个系统内的降解,但由于HClO/ClO^(-)的摩尔吸光系数高于H_(2)O_(2),HA对GEM在UV/NaClO系统内降解的抑制效应较小。OH和Cl是UV/NaClO系统内降解GEM的主要氧化物种,GEM在两个高级氧化系统内降解过程主要包括羟基化、去甲基化、H提取和C—O键断裂步骤。经济效益评估可知,UV/NaClO系统比UV/H_(2)O_(2)系统更具有成本效益。
The degradation of gemfibrozil(GEM)by UV/H_(2)O_(2)and UV/NaClO processes was comparatively evaluated.Both advanced oxidation systems can effectively degrade GEM.Compared with UV/H_(2)O_(2)system,the degradation rate of GEM in UV/NaClO system was faster.In UV/H_(2)O_(2)and UV/NaClO systems,the degradation rate of the target increased with the increase of oxidant concentrations.Because pH could affect the oxidation capacity of‧OH and the composition ratio of free radicals in UV/NaClO system,the pH of the solutions had a significant impact on both systems.When pH was increased from 5 to 11,the kobs in UV/H_(2)O_(2)and UV/NaClO decreased from 0.2115min^(-1)and 1.3115min^(-1)to 0.1064min^(-1)and 0.2283min^(-1),respectively.Cl^(-)and HCO_(3)^(-)can slightly accelerate the degradation of GEM in UV/NaClO system,but slightly slow down the degradation of GEM in UV/H_(2)O_(2)system.HA can inhibit GEM degradation in both systems through competition and filter effect.Because the molar absorption coefficient of HClO/ClO^(-)was higher than H_(2)O_(2),HA had less inhibitory effect on GEM degradation in UV/NaClO system compared with UV/H_(2)O_(2)system.The main oxidation species degrading GEM in UV/NaClO system were‧OH and Cl^(-).The degradation path of GEM in both systems mainly included hydroxylation,demethylation,H-extraction and C-O bond breakage steps.In terms of economic benefits,UV/NaClO system was more cost-effective than UV/H_(2)O_(2)system.
作者
闫博引
韩春宇
夏晶晶
王松雪
武桂芝
夏文香
李金成
YAN Boyin;HAN Chunyu;XIA Jingjing;WANG Songxue;WU Guizhi;XIA Wenxiang;LI Jincheng(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第11期6102-6112,共11页
Chemical Industry and Engineering Progress
基金
山东省自然科学基金(ZR2021QE234)
国家自然科学基金(52100010)
河海大学浅水湖泊综合治理与资源开发教育部重点实验室开放项目。
