复合催化剂α-(Fe，Cu)OOH/RGO的制备、表征及其协同H2O2在可见光下去除环丙沙星性能

采用一步回流法制备了α-(Fe,Cu)OOH/RGO复合催化剂,通过粉末X射线衍射、扫描电子显微镜和X射线光电子能谱等对催化剂进行了表征,并以30 mg·L^-1的环丙沙星(CIP)为目标污染物,研究了不同制备条件下所得催化剂在可见光照射下协同H2O2对CIP的去除效果。结果表明,成功实现了α-(Fe,Cu)OOH纳米棒在石墨烯二维薄片上原位生长,α-(Fe,Cu)OOH/RGO复合材料的可见光吸收边发生红移,禁带宽度从2.02 eV变为1.76 eV。石墨烯复合不但增强了对污染物的吸附能力,而且加快了光生电子的分离、迁移速率,还提高了反应体系中电子的传导效率。当石墨烯复合比例(质量分数)为1%时,复合催化剂的催化性能最佳。当催化剂投加量为0.40 g·L^-1,H2O2浓度为0.10 mol·L^-1时,反应120 min,CIP被全部去除。α-(Fe,Cu)OOH/RGO循环使用5次,对CIP的去除率均在90%以上,表明催化剂具有较强的催化活性和较好的稳定性。

Composite Catalyst α?(Fe,Cu)OOH/RGO:Synthesis,Characterization and Removal of Ciprofloxacin Synergized with H2O2 under Visible Light

The compositeα-(Fe,Cu)OOH/RGO was synthesized via one-step reflux method.The as-obtained catalyst was analyzed by means of X-ray powder diffraction,scanning electron microscopy,X-ray photoelectron spectroscopy and other characterization methods.With 30 mg·L^-1 ciprofloxacin(CIP)as the target pollutant,the effect of the catalyst obtained under different synthesis conditions on the removal of CIP by H2O2 under visible light was investigated.The results show thatα-(Fe,Cu)OOH nanorods were grown in situ on two-dimensional graphene sheets.The visible light absorption edge ofα-(Fe,Cu)OOH/RGO composite material was red-shifted and the band gap was changed from 2.02 to 1.76 eV.Graphene composite could not only enhance the adsorption capacity of pollutants,but also accelerate the separation and transfer rate of photogenerated electrons,as well as improve the efficiency of electron conduction in the reaction system.The best catalytic performance was gained when the composite content(mass fraction)of graphene was 1%.The CIP was completely removed after 120 min when the addition of catalyst was 0.40 g·L^-1 and the concentration of H2O2 was 0.10 mol·L^-1.The removal efficiency of CIP reached to 90%even after fivetime reuse,which indicates that the catalyst has strong catalytic activity and good stability.