多壁碳纳米管负载掺杂Cu/Mn二氧化钛的表征及脱硫性能

Characterization and Photocatalytic Removal of Sulfur Dioxide by Cu or Mn Doped TiO_2 Coating on Multi-walled Carbon Nanotubes

本文利用溶胶凝胶法制备多壁碳纳米管负载TiO_2及掺杂Cu/Mn的TiO_2(MWCNTs/TiO_2,MWCNTs/CuTiO_2及MWCNTs/Mn-TiO_2)。利用透射电镜(TEM),X射线衍射仪(XRD),X射线能谱仪(EDX)和紫外-可见分光光度计(UV-Vis)对制备的光催化剂进行表征。结果表明Cu/Mn掺杂的光催化剂TiO_2晶相以锐钛矿为主,晶粒尺寸较纯TiO_2降低。DRS图谱表明MWCNTs/TiO_2光吸收边拓展至可见光区域,而10%MWCNTs/Cu-TiO_2及0.5%MWCNTs/Mn-TiO_2在紫外可见光区域都有较强的光吸收强度。用固定床反应器,对光催化剂的脱硫性能进行研究,MWCNTs/TiO_2具有较强的光催化脱硫能力,10%MWCNTs/Cu-TiO_2及0.5%MWCNTs/Mn-TiO_2的光催化脱硫效率分别提高至71%和69%。

MWCNTs/TiO_2,MWCNTs/Cu-TiO_2 and MWCNTs/Mn-TiO_2 were synthesized by a sol-gel method.Transmission Electron Microscope(TEM),X-ray diffraction,Energy Dispersive X-ray Spectrom(EDX) and UV-Vis diffuse reflectance spectroscopy(DRS) were performed to characterize the photocatalysts.The results showed MWCNTs/Cu-TiO_2 and MWCNTs/Mn-TiO_2consisted mainly of anatase,followed by a reduction of crystalline sizes.Moreover,the absorption edge of MWCNTs/TiO_2 extended toward long-wavelength region.The strong absorption in the UV and visible region were observed on 10%MWCNTs/Cu-TiO_2 and 0.5%MWCNTs/Mn-TiO_2.The removal efficiency of SO_2 was evaluated in a fixed-bed photocatalytic reactor.MWCNTs/TiO_2 performed well on SO_2 removal compared to bare TiO_2.Moreover,71%and 69%of SO_2 removal were achieved on10%MWCNTs/Cu-TiO_2 and 0.5%MWCNTs/Mn-TiO_2.