Cu/纤维素基TiO_(2)复合材料的制备及光催化性能

Preparation and photocatalytic performance of Cu/cellulose-based TiO_(2) composite

以制备的氮掺杂二氧化钛复合纳米微晶纤维素和还原氧化石墨烯材料(N-TiO_(2)/NCC-rGO)为载体,CuCl_(2)为前驱体,分别采用浸渍法和水热法制备了铜负载氮掺杂二氧化钛复合纳米微晶纤维素和还原氧化石墨烯(Cu/N-TiO_(2)/NCC-rGO)复合催化材料,并通过X射线衍射、红外光谱、扫描电镜、漫反射光谱等手段对其进行表征。在可见光照射下评估了复合材料对苯酚降解的光催化性能,研究了负载方法及负载量对复合材料催化活性的影响。结果表明:Cu负载未对锐钛矿型TiO_(2)的结构产生影响;两种负载方法制备的Cu/N-TiO_(2)/NCC-rGO吸收边带分别红移至482nm和459nm,提高了材料在可见光区的吸收,增强光催化活性。在蓝光照射下,Cu①/N-TiO_(2)/NCC-rGO的可见光催化苯酚降解率最终达78.91%,Cu②/N-TiO_(2)/NCC-rGO的可见光催化苯酚降解率最终达75.08%,快速反应阶段由负载前的120~180min变为0~60min,大大提高了反应速率。

The laboratory-prepared nitrogen doped titanium dioxide/manocrystalline cellulose-reduced graphene oxide(N-TiO_(2)/NCC-rGO)was used as the carrier,CuCl_(2) was used as the precursor,Cu/N-TiO_(2)/NCC-rGO composite catalysts were prepared by impregnation and hydrothermal methods respectively.The microstructures of Cu/N-TiO_(2)/NCC-rGO composite materials were characterized utilizing X ray diffraction(XRD),infrared spectroscopy(IR),scanning electron microscope(SEM),fourier transform infrared spectrum(FT-IR)and diffuse reflection spectrum(DRS).The photocatalytic performance of the materials were assessed under blue light irradiation for the phenol degradation,and the effects of loading method and loading amount on the performance of the composites were investigatived.The results shown that the loading of Cu had no influence on the structure of anatase TiO_(2).The absorption sidebands of Cu/N-TiO_(2)/NCC-rGO prepared by the two loading methods were red-shifted to 482nm and 459nm,respectively,which improved the material's visible region absorption and enhanced photocatalytic activity.Under blue light irradiation,the visible light-catalyzed phenol degradation efficiency of Cu①/N-TiO_(2)/NCC-rGO was 78.91%,and the degradation efficiency of Cu②/N-TiO_(2)/NCC-rGO was 75.08%.The rapid reaction stage changed from 120~180 minutes to 0~60 minutes with the copper impregnated composite,which greatly improved the reaction rate.