C/Cr2O3/TiO2复合材料的制备及其光催化性能研究

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/Cr₂O₃/TiO₂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/Cr₂O₃/TiO₂光催化剂具有明显的介孔结构,比表面积较大,为277.47 m²·g^-1,Cr₂O₃和TiO₂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/Cr₂O₃/TiO₂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·O₂^-,·OH和h⁺。

Preparation and photocatalytic degradation property of C/Cr2O3/TiO2 composite photocatalyst

A novel C/Cr₂O₃/TiO₂ 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/Cr₂O₃/TiO₂ photocatalyst were studied using tetracycline(TC)as target pollutant.The results showed that C/Cr₂O₃/TiO₂ photocatalyst possessed an obvious mesoporous structure and large specific surface area(277.47 m²·g^-1),and both Cr₂O₃ and TiO₂ were successfully recombined and loaded on the biochar(C)to obtain the C/Cr₂O₃/TiO₂ 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/Cr₂O₃/TiO₂ photocatalyst mainly depended on the large amount of·O₂^-,·OH and h⁺ generated in the system.