AgI/BiPO4异质结的原位制备及光催化性能

采用水热合成法制备了磷酸铋(BiPO4)，通过沉淀法成功将AgI负载于BiPO4表面制备了AgI/BiPO4异质结。采用X射线衍射仪(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)等对AgI/BiPO4异质结结构和组成进行了表征；用表面光电压谱(SPS)对异质结光催化剂的光生电荷分离特性进行了研究；考察了AgI/BiPO4异质结光催化剂对模拟污染物罗丹明B的催化降解性能。结果表明，当AgI/BiPO4摩尔比为1.2%时，异质结光催化剂的光生电子-空穴分离速率最高，对罗丹明B的光催化降解性能最好。光催化过程中主要活性自由基为超氧自由基.O2^-，h⁺空穴和.OH自由基是起次要作用的活性自由基。

Study on in-situ fabrication and photocatalytic performance of AgI/BiPO4 heterojunctions

BiPO4 was synthesized via a hydrothermal method, and then AgI was in-situ deposited on the surface of BiPO4 to construct AgI/BiPO4 heterojunctions by a precipitation method. The crystal structures and light response capacity were studied by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). Surface photovoltage spectrometer (SPS) was used to study the separation of photoinduced carriers. Using rhodamine B (RhB) as model pollutant, the photocatalytic activities of AgI/BiPO4 heterojunctions were investigated under Xe lamp (simulated sunlight) irradiation. The results show that when the molar ratio of AgI/BiPO4 is 1.2%, the heterojunctions present the highest separation rate of photoinduced carriers, thus the photocatalyst exhibits the highest destruction capacity toward degradation of RhB. Meanwhile, .O2^- was proven to be the leading reactive radicals during the photocatalytic degradation of RhB, and h⁺ and .OH are secondary active free radicals.