铂、氮共掺杂光催化剂TiO_2/BAC的制备及其性能研究  

Preparation and Photocatalysis Performance of Pt,N Co-doped Bamboo Activated Carbon Supported by TiO_2

作　　者：崔丹丹[1] 蒋剑春[1] 孙康[1] 卢辛成[1] 

机构地区：[1]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业局林产化学工程重点开放性实验室,江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《林产化学与工业》2012年第1期55-60,共6页Chemistry and Industry of Forest Products

基　　金：林业公益性行业专项(201004051);"十一五"国家科技支撑计划资助(2009BADB1B03)

摘　　要：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。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 va- cancies on the catalyst surface. The photocatalytic degradation of formaldehyde aqueous solution, using TiOJBAC, Pt/TiO2/ BAC, N/TiOJBAC 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 fom- aldehyde degradation rae by Pt/N/TiOJBAC and 2.6 times of that by TiO2/BAC under similar conditions Pt/N/TiO2/BAC had good property of separation.

关 键 词：竹活性炭 共掺杂 Pt/N/TiO2/BAC 甲醛 

分 类 号：TQ351[化学工程] TQ424.1