La_(2)O_(3)/Bi_(5)O_(7)I光催化剂的制备和降解抗生素性能研究

Preparation of La_(2)O_(3)/Bi_(5)O_(7)I Photocatalyst and Study on the Performance of Degrading Antibiotics

以稀土镧元素修饰铋系半导体光催化剂,增强其光催化降解性能。通过溶剂热法合成BiOI、La(OH)_(3)和La(OH)_(3)/BiOI光催化剂,再利用煅烧法制备Bi_(5)O_(7)I、La_(2)O_(3)和La_(2)O_(3)/Bi_(5)O_(7)I光催化剂,对上述材料进行表征分析,研究在可见光下降解四环素的活性。结果表明,BiOI、Bi_(5)O_(7)I、La(OH)_(3)∶BiOI=2∶1以及La_(2)O_(3)∶Bi_(5)O_(7)I=1∶2的四环素去除率分别为84.0%、53.7%、91.7%以及90.9%;La_(2)O_(3)∶Bi_(5)O_(7)I=1∶2复合光催化剂的降解速率常数最高,为Bi_(5)O_(7)I的2倍,La(OH)_(3)∶BiOI=2∶1的1.15倍。

Bismuth semiconductor photocatalyst was modified with lanthanum to enhance its photocatalytic degradation performance.BiOI,La(OH)_(3)and La(OH)_(3)/BiOI photocatalysts were synthesized by solvothermal method,and then Bi_(5)O_(7)I,La_(2)O_(3)and La_(2)O_(3)/Bi_(5)O_(7)I photocatalysts were prepared by calcination method.The above materials were characterized and analyzed to study the activity of tetracycline degradation under visible light.The results showed that the tetracycline removal rates of BiOI,Bi_(5)O_(7)I,La(OH)_(3)∶BiOI=2∶1 and La_(2)O_(3)∶Bi_(5)O_(7)I=1∶2 were 84.0%,53.7%,91.7% and 90.9% respectively.The degradation rate constant of La_(2)O_(3)∶Bi_(5)O_(7)I=1∶2 composite photocatalyst is the highest,twice that of Bi_(5)O_(7)I,and 1.15 times that of La(OH)3∶BiOI=2∶1.