C/Cr_(2)O_(3)/TiO_(2)复合材料的制备及其光催化性能研究  

Preparation and photocatalytic degradation property of C/Cr_(2)O_(3)/TiO_(2) composite photocatalyst

作　　者：赵黎明 张映娇 郭丽君 唐余玲[1] 周建飞[1,2] 石碧[1,2] ZHAO Li-ming;ZHANG Ying-jiao;GUO Li-jun;TANG Yu-ling;ZHOU Jian-fei;SHI Bi(National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China;The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education,Sichuan University,Chengdu 610065,China)

机构地区：[1]制革清洁技术国家工程实验室(四川大学),四川成都610065 [2]皮革化学与工程教育部重点实验室(四川大学),四川成都610065

出　　处：《化学研究与应用》2022年第1期134-140,共7页Chemical Research and Application

基　　金：国家重点研发计划项目(2018YFC1802201)资助;皮革化学与工程教育部重点实验室(四川大学)开放课题基金项目(SCU2021D005)资助。

摘　　要：本文以制革含铬革屑为原材料,基于矿物鞣剂复鞣的原理,将Ti(IV)均匀、稳定地负载到含铬革屑上,在氮气氛围下,经高温热解制备得到C/Cr_(2)O_(3)/TiO_(2)光催化剂,并研究了其对四环素(TC)的光催化降解效果及机理。结果表明,C/Cr_(2)O_(3)/TiO_(2)光催化剂具有明显的介孔结构,比表面积较大,为277.47 m^(2)·g^(-1),Cr_(2)O_(3)和TiO_(2)已实现复合并负载在生物炭(C)上。通过光催化降解发现,在模拟自然光照下,当催化剂用量为0.04 g,TC初始浓度为50 mg·L^(-1),溶液pH为2时,TC的去除率可高达99.99%。结合自由基捕获实验发现,C/Cr_(2)O_(3)/TiO_(2)光催化剂对TC的降解作用主要依靠反应体系中产生的大量·O_(2)^(-),·OH和h^(+)。A novel C/Cr_(2)O_(3)/TiO_(2) photocatalyst was fabricated using chrome shavings as raw materials by traditional pyrolysis method under a nitrogen atmosphere,and the photocatalytic ability and mechanism of C/Cr_(2)O_(3)/TiO_(2) photocatalyst were studied using tetracycline(TC)as target pollutant.The results showed that C/Cr_(2)O_(3)/TiO_(2) photocatalyst possessed an obvious mesoporous structure and large specific surface area(277.47 m^(2)·g^(-1)),and both Cr_(2)O_(3) and TiO_(2) were successfully recombined and loaded on the biochar(C)to obtain the C/Cr_(2)O_(3)/TiO_(2) photocatalyst.Under the simulated light irradiation,when the initial concentration of TC was 50 mg·L^(-1),the removal rate of TC could reach 99.99%with a catalyst dosage of 0.04 g,at pH of 2.Furthermore,the results of radical trapping experiments indicated that the high degradation rates of TC by C/Cr_(2)O_(3)/TiO_(2) photocatalyst mainly depended on the large amount of·O_(2)^(-),·OH and h^(+) generated in the system.

关 键 词：含铬革屑 TiO_(2) 光催化 四环素 

分 类 号：O643.32[理学—物理化学]