摘要
以RGO(还原氧化石墨烯膜)为载体,采用水热法制备RGO/Co_(3)O_(4)高效复合催化剂。通过XRD(X射线衍射仪)、SEM(扫描电子显微镜)和XPS(X射线光电子能谱仪)等手段对复合催化剂的结构、形貌和化学组成等进行表征,并以RhB(罗丹明B)为降解物评价复合催化剂活化PMS(过硫酸氢钾)的反应活性。另外,考察了PMS质量浓度、RhB初始质量浓度、pH值及温度对催化剂活化PMS降解RhB的影响。结果表明:在PMS质量浓度为100 mg/L、RhB初始质量浓度为10 mg/L、pH值为7、温度为25℃时反应18 min对RhB降解率为98%。自由基捕获实验结合ESR(电子顺磁共振)结果表明体系中同时存在SO_(4)^(-·)和HO·2种活性自由基。循环实验结果显示催化剂经过5次循环使用后对RhB的降解率仍保持90%以上,显示优异的循环稳定性。
An efficient RGO/Co_(3)O_(4) composite catalyst was prepared by hydrothermal method with RGO(reduced graphene oxide) membrane as support.The crystal structure,morphology and chemical composition of composite catalyst were characterized by XRD,SEM and XPS.RhB(Rhodamine B) degradation was employed as a model test for evaluating PMS(potassium peroxymonosulfate) activation.The effects of PMS mass concentration,RhB initial mass concentration,pH and temperature on the degradation of RhB by composite catalyst activated PMS were investigated.The results show the degradation rate of RhB is 98% after 18 min reaction at PMS mass concentration of 100 mg/L,RhB initial mass concentration of 10 mg/L,pH of 7,and 25 ℃.Free radical capture experiment combined with ESR identification confirms that SO_4^(-·) and HO· both exist in the system and contributes to RhB degradation.After five cycles,the degradation rate of RhB still maintains above 90% with RGO/Co_(3)O_(4) catalyst,showing excellent cycling stability.
作者
蔺甜
阎鑫
王嘉玮
LIN Tian;YAN Xin;WANG Jiawei(School of Materials Science and Engineering,Chang′an University,Xi′an 710064,Shaanxi Province,China;The Eighth Oil Production Service Department,CNPC Changqing Oilfield Company,Xi′an 750100,Shaanxi Province,China)
出处
《化学工程》
CSCD
北大核心
2024年第1期24-29,共6页
Chemical Engineering(China)
基金
陕西省重点研发计划(2022GY-426)。
