以Bi （NO₃）₃·5H₂O和Na₂WO₄·2H₂O为前驱体，采用溶剂热法合成了Bi₂WO₆/Bi₂O₂CO₃异质结，利用XRD、XPS、SEM、TEM、BET、FT-IR、UV-Vis、PL等对催化剂进行表征和分析。以环丙沙星和罗丹明B为目标污染物，在可见光下对污染物进行降解，并探究了材料的光催化活性。结果表明，Bi₂WO₆/Bi₂O₂CO₃复合材料的光催化活性远高于纯Bi₂WO₆和纯Bi₂O₂CO₃，原因是Bi₂WO₆和Bi₂O₂CO₃之间形成了异质结，提高了电子空穴的传输速率，降低了载流子复合率。自由基淬灭试验发现，超氧自由基（·O^2-）和空穴（h⁺）是主要的活性物种。同时对Bi₂WO₆/Bi₂O₂CO₃复合材料降解污染物的机理进行了探究。

Bi₂WO₆/Bi₂O₂CO₃ heterojunction catalyst is synthesized via solvothermal method using Bi(NO₃)₃·5H₂O and Na₂WO₄·2H₂O as precursors.The catalysts are characterized and analyzed by means of XRD, XPS, SEM, TEM, BET, FT-IR, UV-Vis, PL, etc.Taking ciprofloxacin and Rhodamine B as the target pollutants, the photocatalytic activity of Bi₂WO₆/Bi₂O₂CO₃ composite catalyst is investigated through the degradation of target pollutants under visible light.The results show that the photocatalytic activity of Bi₂WO₆/Bi₂O₂CO₃ composite materials is much higher than those of pure Bi₂WO₆ and pure Bi₂O₂CO₃, which is contributed by a heterojunction formed between Bi₂WO₆ and Bi₂O₂CO₃.The heterojunction improves the transmission rate of electron holes and reduces the recombination rate of carriers.It is found through free radical quenching test that superoxide radical (·O^2-) and hole (h⁺) are the main active species.The degradation mechanism of pollutants by Bi₂WO₆/Bi₂O₂CO₃ composites is also explored.

田浩然(1997-),男,硕士研究生,研究方向为水污染控制,2558399277@qq.com