3D花状Bi_2WO_6催化降解水中头孢曲松钠

Photocatalytic degradation of ceftriaxone sodium in aquatic environment with 3D-flowerlike Bi_2WO_6

近年来头孢曲松钠滥用导致严重的环境问题,寻找一种绿色环保降解抗生素的方法迫在眉睫。通过水热法,采用盐酸调控反应pH=5,成功制得3D花朵状Bi_2WO_6光催化剂。通过可见光(λ>420 nm)催化降解水中头孢曲松钠,结果表明,3D花朵状Bi_2WO_6光催化剂在240 min可降解70.18%的头孢曲松钠;对催化机理研究发现,空穴(h+)和超氧自由基(·O-2)起主要催化作用,羟基自由基(·OH)次之。制备的Bi_2WO_6光催化剂在降解水中残余抗生素类有机污染物方面具有潜在应用价值。

The overuse and misuse of ceflriaxone sodium have leaded a series of ecological,environmental and health issues, and it is urgent to find a green and security method to remove antibiotic from water effectively. In this study, 3D-flower like microspheres of Bi2WO6 nanocrystals have been successfully prepared via hydrothermal method by simply adjusting pH values as 5 with hydrochloric acid. Photocata-lyric degradation of ceflriaxone sodium under visible light irradiation （ λ 〉 420 nm ） was carried out to evaluate catalytic properties. Results indicated that 3D-flower like Bi2WO6 showed the best photocatalytic activity and degradation rate of ceflriaxone sodium monitored was 70. 18% under visible light during 240 rain. h ^＋ and · O2^- played major roles compared with · OH in photocatalytic degradation process by getting insight into reaction mechanism. Moreover cation in inhibiting environmental pollution. , the as-prepared samples have potential further appli-cation in inhibiting envionmental pollution.