BiOI/H_(3)PW_(12)O_(40)光催化剂制备及除甲醛研究

Study on Preparation of BiOI/H3PW12O40 Photocatalyst and Formaldehyde Removal

将有着优异的可见光吸收性的BiOI和具有优异电子接受和转移性能的磷钨酸(H_(3)PW_(12)O_(40))通过简单的原位法复合制备,得到BiOI/H_(3)PW_(12)O_(40)复合光催化剂。采用SEM,XRD,紫外可见(UV-Vis)漫反射光谱等技术对其进行表征,利用可见光降解甲醛实验评估催化剂的光催化性能。光催化实验结果表明,当H_(3)PW_(12)O_(40)掺杂量为0.05 g时,BiOI/PW_(12)(0.05)复合光催化剂在60 min内对甲醛的降解率达到68%,明显高于降解率仅为21%的单体Bi OI。自由基捕获实验表明,·O2^(-)和h^(+)是甲醛光降解过程中的主要活性物种。

BiOI/H_(3)PW_(12)O_(40)composite photocatalyst was prepared by simple in situ method using BiOI with excellent visible light absorption and phosphotungstic acid(H_(3)PW_(12)O_(40))with excellent electron acceptance and transfer properties.The composite photocatalyst was characterized by SEM,XRD,UV-Vis diffuse reflection spectroscopy and other techniques,and the photocatalytic performance of the catalyst was evaluated by visible light degradation of formaldehyde.The experimental results of photocatalytic degradation of formaldehyde showed that when the doping amount of H_(3)PW_(12)O_(40)was 0.05 g,the degradation rate of formaldehyde by BiOI/PW_(12)(0.05)photocatalyst reached 68%within 60 min under visible light,which was significantly higher than that of monomer BiOI whose degradation rate was only 21%.Free radical capture experiment showed that·O_(2)^(-)and h^(+)were the main active species in the process of photodegradation of formaldehyde.