摘要
以商业红磷(C-RP)为原料,去离子水为溶剂,采用水热法一步制备介孔红磷,重点考察了水热温度对其形貌和性能的影响.通过XRD、SEM、TEM、BET、FT-IR和UV-Vis等方法对样品的晶相结构、微观形貌、比表面积、孔径大小和吸光性能等进行了表征和分析.以罗丹明B(RhB)为模拟污染物,探究了其可见光催化性能,同时也进行了自由基捕获实验.结果表明:与商业红磷相比,200℃水热处理的红磷(N-RP-2)具有明显的介孔结构和更大的比表面积,为其光催化降解污染物提供更多的活性位点;在可见光下,商业红磷对RhB几乎无催化降解作用,而N-RP-2在60 min对RhB降解率达到97.19%,经4次重复实验后对RhB降解率仍然达到90.50%;该催化剂对甲基橙(MO)、亚甲基蓝(MB)等模拟污染物也具有良好的催化降解效果;自由基捕获实验结果表明超氧自由基(·O-2)对催化活性起决定作用.
In this study,commercial red phosphorus(C-RP)and deionized water were respectively used as the raw material and solvent to prepare mesoporous red phosphorus in one step by hydrothermal method,and the influence of hydrothermal temperature on its morphology and catalytic performance was mainly discussed.A variety of characterzation and analysis methods such as XRD,SEM,TEM,BET,FT-IR and UV-vis were used to investigate in detail the crystal phase structure,micro morphology,specific surface area,pore size and property of light absorption of the prepared samples.Rhodamine B(RhB)was used as a simulated pollutant to explore the visible light catalytic performance of the catalysand and free radicat trapping experiments were also carried out.The results shown that,compared with commercial red phosphorus,the red phosphorus after hydrothermal treatment at 200℃(N-RP-2)has an obvious mesoporous structure and larger specific surface area,which provide more active sites for photocatalytic degradation of pollutants.The experimental results indicated that commercial red phosphorus has almost no catalytic degradation effect on RhB under visible light,while the degradation rate of RhB by N-RP-2 could reached 97.19%in 60 minutes.The degradation rate of RhB still reaches 90.50%after 4 repeated experiments.In addition,the catalyst also has a good catalytic degradation effect on simulated pollutants such as methyl orange(MO)and methylene blue(MB).The results of free radical trapping experiments show that superoxide radicals(·O-2)play a main role in catalytic activity.
作者
杨林海
任学昌
张玉杰
陈作雁
YANG Lin-hai;REN Xue-chang;ZHANG Yu-jie;CHEN Zuo-yan(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730000,China)
出处
《兰州交通大学学报》
CAS
2020年第6期112-118,132,共8页
Journal of Lanzhou Jiaotong University
关键词
介孔红磷
可见光
光催化
污染物
mesoporous red phosphorus
visible light
photocatalytic
pollutant
