漂浮型BiOCl0.6I0.4/GO光催化剂的制备及其除藻性能

通过以膨胀珍珠岩（EP）为载体，水浴加热原位合成漂浮型BiOCl_0.6I_0.4/GO光催化剂，并研究其在可见光下对铜绿微囊藻的去除效果.利用X射线衍射（XRD）、扫描电镜（SEM）、傅里叶红外光谱（FT-IR）、紫外可见漫反射光谱（UV-Vis DRS）、X射线能谱（XPS）等方法对合成样品的组成和形貌结构进行了表征.结果显示，BiOCl_0.6I_0.4/GO/EP复合材料比BiOCl_0.6I_0.4/EP和GO/EP具有更强的光催化除藻效果，且在4次循环使用之后仍有较好的光催化活性.此外，自由基捕获实验证明光催化反应中光生空穴（h⁺）是藻类失活的主要活性物质.最后，根据能带分析和自由基捕获试验提出BiOCl_0.6I_0.4/GO/EP复合材料的反应机理.

Preparation of floating BiOCl0.6I0.4/GO photocatalyst and its algae removal performance

Using expanded perlite(EP) as a floating carrier, the BiOCl_0.6I_0.4/GO photocatalyst was synthesized by water bath method and its removal efficiency on Microcystis aeruginosa under visible light was investigated as well. The composition and morphology of synthesized samples were characterized by XRD, SEM, FTIR spectra, UV-Vis DRS and XPS. Results indicated that the synthesized BiOCl_0.6I_0.4/GO/EP composite showed better algae removal performance than that of BiOCl_0.6I_0.4/EP and GO/EP. Even after four cycles reuse, the composite still showed better photocatalytic activity. Furthermore, free radical capture experiment proved that photo-generated holes (h⁺) were the main active species for the inactivation of algae in photocatalytic process. Finally, according to the energy band analysis and free radical capture experiment, the mechanism of BiOCl_0.6I_0.4/GO/EP composite was proposed.