摘要
本文以Fe3O4为磁基体,采用水热合成法制备了易于固液分离的磁性Bi4VO8Cl复合可见光催化剂.利用XRD、UV-Vis DRS、TEM、HRTEM对其进行表征.以模拟可见光作为驱动光源,以难降解染料甲基橙为目标降解物评价了不同磁性含量光催化剂的活性,发现当Fe3O4占Bi4VO8Cl质量的15%时,复合催化剂表现出良好的磁性与催化活性,对甲基橙的降解率达到85%.在此条件下考察了其在模拟可见光下对4种喹诺酮类抗生素的降解和矿化情况,并以甲磺酸培氟沙星为例考察各种因素对降解性能的影响.结果表明,磁性Bi4VO8Cl对以上抗生素均表现出良好的光催化活性,在最佳条件下对甲磺酸培氟沙星的降解率达94%,矿化率为87%.用外加磁铁直接回收催化剂,循环使用5次后仍保持88%的降解率及94%的催化剂回收率.
Magnetic visible-light-responsive photocatalysts have the advantages of direct utilization of solar energy and convenient recovery and reuse. In this paper,a magnetic visible-light-responsive Bi4VO8 Cl photocatalyst was fabricated via hydrothermal method with Fe3O4 as support,and was characterized by XRD,UV-Vis DRS,TEM and HRTEM. The photocatalytic activity was evaluated by the removal of degradation-resistant dye methyl orange in aqueous solution under simulated visible light irradiation. It was found that the photocatalyst containing 15 wt% Fe3O4 exhibited the best magnetism and photocatalytic performance,and 85% methyl orange could be removed. Then the degradation and mineralization rate of four quinolone antibiotics in water by the photocatalyst was investigated,and pefloxacin mesylate was selected as a representative antibiotic to investigate the factors affecting the degradation of antibiotic by the magnetic Bi4VO8 Cl photocatalyst. It was shown that the magnetic Bi4VO8 Cl photocatalyst（ 15% Fe3O4） also exhibited excellent photocatalytic performance for the antibiotics mentioned above. Under optimized conditions,94% degradationefficiency and 87% mineralization rate were achieved for pefloxacin mesylate. The photocatalyst could be easily recovered using an external magnet,and it was noted that 88% degradation efficiency for the antibiotic and 94% recovery rate for the photocatalyst were retained respectively,after five recycles.
出处
《环境化学》
CAS
CSCD
北大核心
2015年第11期1996-2003,共8页
Environmental Chemistry
基金
河南省重点科技攻关计划(102102210061)
河南省科技创新杰出人才计划(144200510004)资助
