Ag_(3)PO_(4)/BiOI复合材料的制备及其光催化性能研究

Preparation and photocatalytic properties of Ag_(3)PO_(4)/BiOI composites

采用简易研磨法将Ag_(3)PO_(4)颗粒负载在纳米片组装的BiOI微球表面,制备出p-n型Ag_(3)PO_(4)/BiOI异质结光催化剂。利用不同表征手段对Ag_(3)PO_(4)/BiOI复合材料的物相、形貌、化学组成和光学吸收特性进行了分析,并探索了其在可见光下光降解盐酸金霉素(CTC)的性能。结果表明:AB-2(Ag_(3)PO_(4)与BiOI质量比为1∶2)表现出最高的光降解CTC活性,可见光照射75min后AB-2对CTC(20mg/L)的去除率为79.2%,高于单一Ag_(3)PO_(4)与BiOI光催化剂。此外,AB-2光催化剂在循环使用5次后对CTC的去除率为70.3%,具有较好的重复使用性。p型BiOI和n型Ag_(3)PO_(4)构成p-n型异质结结构,促进了光生电子和空穴的有效分离,进而降低了电子-空穴对的复合效率,提升了Ag_(3)PO_(4)/BiOI复合材料的光催化活性。

Ag_(3)PO_(4)particles were loaded onto the surface of BiOI microspheres assembled from nanoflakes by a simple grinding method to prepare a p-n type Ag_(3)PO_(4)/BiOI heterojunction photocatalyst.The phase,morphology,chemical composition,and optical absorption properties of the Ag_(3)PO_(4)/BiOI composites were analyzed using various characterization techniques,and its performance in visible light-induced degradation of chlortetracycline hydrochloride(CTC)was explored.The results showed that the AB-2(mass ratio of Ag_(3)PO_(4)to BiOI of 1∶2)exhibited the highest CTC degradation activity,with a removal efficiency of 79.2%for CTC(20mg/L)under visible light irradiation for 75 minutes,which was higher than that of the Ag_(3)PO_(4)and BiOI photocatalysts alone.In addition,the AB-2 photocatalyst had a removal efficiency of 70.3%for CTC after five cycles of reuse,showing good repeatability.The p-type BiOI and n-type Ag_(3)PO_(4)formed a p-n type heterojunction structure,which promoted the effective separation of photogenerated electrons and holes,thereby reducing the recombination efficiency of electron-hole pairs and enhancing the photocatalytic activity of the Ag_(3)PO_(4)/BiOI composites.