/BAC的制备及其性能研究

采用竹活性炭(BAC)作为载体,以尿素为氮源,采用溶胶-凝胶法掺杂了N元素的TiO2/BAC,然后通过等体积浸渍法负载Pt,制备了铂、氮共掺杂型光催化剂(Pt/N/TiO2/BAC)。样品的N2吸附、XRD、FT-IR、XPS等分析结果表明:掺杂后BAC的比表面积、比孔容积等均有所下降,对中孔及大孔影响更明显;Pt、N共掺杂不改变TiO2的晶型类型,有利于TiO2在活性炭表面分散,N掺杂使晶粒粒径减小,Pt掺杂对晶粒粒径影响不明显;N、Pt通过化学键与TiO2相结合,实现了晶格掺氮,在催化剂表面形成了表面活性位Pt0。样品TiO2/BAC、Pt/TiO2/BAC、N/TiO2/BAC、Pt/N/TiO2/BAC在紫外光、氙灯照射下对水溶液中甲醛的降解研究结果表明:N掺杂拓宽了催化剂的光吸收范围,Pt掺杂增强了TiO2的光催化活性;Pt/N/TiO2/BAC的甲醛去除率达到TiO2/BAC的2.6倍,并且具有良好的分离性能。

Preparation and Photocatalysis Performance of Pt,N Co-doped Bamboo Activated Carbon Supported by TiO2

After loading of TiO2 on bamboo activated carbon(BAC) through sol-gel method,elements of Pt and N were doped on the composite to produce Pt/N/TiO2/BAC.N2 adsorption,XRD,FT-IR and XPS analysis have been used to characterize these samples.Analysis results showed that doping method can reduce the BET surface area and the pore volume;Pt,N co-doping can not change the crystal type,but it is helpful for the scattering of TiO2 particles on BAC surface;N doping inhibited anatase changing to tutile,but lessened agglomeration;N entered into the TiO2 lattice,Pt made more active sites and there were oxygen vacancies on the catalyst surface.The photocatalytic degradation of formaldehyde aqueous solution,using TiO2/BAC,Pt/TiO2/BAC,N/TiO2/BAC and Pt/N/TiO2/BAC respectively,under UV lamp and xenon lamp was also investigated.The results showed that co-doping of Pt and N not only widened the light absorption width but also enhanced photocatalytic activity.The fomaldehyde degradation rae by Pt/N/TiO2/BAC and 2.6 times of that by TiO2/BAC under similar conditions Pt/N/TiO2/BAC had good property of separation.