介孔Ag/AgCl/CeO2的制备及其photo-CWPO体系的催化性能  

Preparation of Ag/AgCl/CeO2 with mesoporous and its catalytic performance in photo-CWPO system

作　　者：赵国峥[1,2] 李长波[2] 张洪林 ZHAO Guozheng;LI Changbo;ZHANG Honglin(Liaoning Technical University,College of Mining,Fuxin 123000,Liaoning,China;Liaoning Shihua University,College of environment and safety engineering,Fushun 113001,Liaoning,China;Liao Ning Oxiranchem,Inc.,Liaoyang 111003,Liaoning,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001 [3]辽宁奥克化学股份有限公司,辽宁辽阳111003

出　　处：《精细化工》2020年第7期1400-1407,共8页Fine Chemicals

基　　金：国家水体污染控制与治理科技重大专项课题(2012ZX07202-002)。

摘　　要：以六水合硝酸铈、硝酸银和嵌段共聚物F127为原料,采用微波辅助软模板法、沉积-沉淀法和光还原法制备了有序介孔Ag/AgCl/CeO2催化剂。通过XRD、SEM、EDS、TEM、N2吸附-脱附和UV-vis DRS对该催化剂的形貌、结构及化学组成进行了表征与测试。建立了光-催化湿式过氧化反应体系(photo-CWPO),考察了Ag/AgCl/CeO2在可见光照射下对丙烯腈废水的催化湿式过氧化(CWPO)降解性能。结果表明:制备的Ag/AgCl/CeO2具有有序的介孔结构,Ag和Ag Cl在CeO2表面形成,最佳Ag负载量为2 mmol时获得样品的比表面积为317.5 m2/g,在可见光区有较强的吸收,禁带宽度2.9 eV。微波辅助快速制备的Ag/AgCl/CeO2催化剂在photo-CWPO体系比单独CWPO体系具有更高的催化性能。Ag负载量、催化剂及H2O2投加量、pH可影响化学需氧量(COD)的去除率。当丙烯腈废水COD质量浓度为500 mg/L,催化剂用量为200 mg,H2O2(质量分数30%)投加量为8 mL,反应60 min时,COD去除率可达90%。Ag/AgCl/CeO2 was prepared by soft template method assisted by microwave,sedimentation and photoreduction,Ce(NO3)3·6 H2 O,AgNO3 and block copolymer F127 as raw materials.The structure,morphology and composition of the prepared catalysts were investigated by XRD、SEM、EDS、TEM、N2-Adsorption desorption and UV-vis DRS.Meanwhile,a photo-CWPO(Catalytic wet peroxide oxidation)system was established.The catalytic degradation of acrylonitrile wastewater by Ag/Ag Cl/Ce O2 under UV-Vis irradiation was studied.The results showed that the Ag/AgCl/CeO2 prepared with best Ag dosage(2 mmol)has ordered mesoporous structure,specific surface area was 317.5 m2/g and the band gap was 2.9 eV with strong absorption in visible light region.The Ag/AgCl/CeO2 Prepared by microwave-assisted method had higher catalytic performance in photo-CWPO system than in CWPO system alone.The removal rate of COD was affected by Ag loading,catalyst and H2 O2 dosage,pH value.When the COD concentration of acrylonitrile wastewater was 500 mg/L,the dosage of catalyst was 200 mg with 30 mg Ag loaded,the amount of H2 O2(mass fraction 30%)was 8 mL,and the reaction time was 60 min,COD removal rate can reach more than 90%.

关 键 词：有序介孔 Ag/AgCl/CeO2 丙烯腈 photo-CWPO 微波辅助 功能材料 

分 类 号：X506[环境科学与工程—环境工程] O643.36[理学—物理化学]