Pt2+/Pt0掺杂g-C3N4光催化降解环丙沙星和偶氮染料
Photocatalytic Degradation of Ciprofloxacin and Azo Dyes by Pt2+/Pt0 Doped g-C3N4
作者单位E-mail
马小帅 广东石油化工学院, 化学工程学院, 茂名 525000
江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000 
 
陈范云 江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000  
余长林 广东石油化工学院, 化学工程学院, 茂名 525000
江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000 
yuchanglinjx@163.com 
杨凯 江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000 yangkai19871006@126.com 
黄微雅 江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000  
李韶雨 江西理工大学材料冶金化学学部, 化学化工学院, 赣州 341000  
摘要: 以三聚氰胺和氯铂酸(H2PtCl6·6H2O)为原材料,采用简单一步煅烧法制备了不同含量的Pt2+/Pt0掺杂石墨相氮化碳(Pt2+/Pt0-CN)。运用扫描电镜、透射电子显微镜、X射线光电子能谱、X射线粉末衍射、N2物理吸附-脱附、紫外-可见漫反射光谱和光电流测试等技术对制备的样品的形貌、化学组成、晶体结构、比表面积和光电性能等物理化学性质进行了表征。由XPS可知Pt粒子以二价Pt和零价Pt掺杂在催化剂的表面和内部,其中Pt0与Pt2+的比约为1∶7.26。与g-C3N4相比,Pt2+/Pt0-CN表现出高效的光催化降解活性。当Pt2+/Pt0理论负载质量分数为0.02%时,对环丙沙星、罗丹明B、酸性橙Ⅱ、甲基橙和亚甲基蓝的降解效率分别提升了43%、64%、39%、42%和52%。Pt2+/Pt0掺杂使催化剂的比表面积大幅度增加,同时增强光催化剂对光的吸收能力,并抑制光生电子(e-)和空穴(h+)的复合。
关键词: 一步煅烧  掺杂  Pt2+/Pt0  氮化碳  光催化性能
基金项目: 国家自然科学基金资助项目(No.21567008),江西省5511科技创新人才计划(No.20165BCB18014),江西省主要学科学术带头人(No.20172BCB22018),广东省珠江学者特聘教授支持计划(No.2019),广东省自然科学基金计划(No.2019A1515011249),广东省扬帆拔尖人才支持计划和赣州市科技创新人才计划资助。
Abstract: Using melamine and chloroplatinic acid (H2PtCl6·6H2O) as raw materials, graphite phase carbon nitride doped with different contents of Pt2+/Pt0 (Pt2+/Pt0-CN) was prepared by a simple one-step calcination method. Their morphologies, crystal structure, chemical compositions, surface area, optical and electrical physicochemical properties were characterized by scan microscopy, transmission electron microscopy, X ray powder diffraction, X ray photoelectron spectroscopy, N2 physical adsorption-desorption, UV-Visible diffuse reflectance spectra and photocurrent measurement. From the XPS analysis, the ratio of Pt0 and Pt2+ was around 1:7.26. Platinum particles were doped into the surface and body of the g-C3N4. Compared with g-C3N4, Pt2+/Pt0-CN composites showed much higher photocatalytic degradation activity than that of g-C3N4. With theory loading mass fraction of Pt2+/Pt0 (0.02%), the degradation rates of ciprofloxacin, rhodamine B, acid orangeⅡ, methyl orange and methylene blue were increased 43%, 64%, 39%, 42% and 52%, respectively. The doping of Pt2+/Pt0 into g-C3N4 can largely boost the surface area. At the same time, the light absorption of Pt2+/Pt0-CN composites was enhanced and the recombination of photogernerated holes (h+) and electrons (e-) was restrained.
Keywords: one-step calcination  doping  Pt2+/Pt0  carbon nitride  photocatalytic performance
投稿时间:2019-05-28 修订日期:2019-11-07
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马小帅,陈范云,余长林,杨凯,黄微雅,李韶雨.Pt2+/Pt0掺杂g-C3N4光催化降解环丙沙星和偶氮染料[J].无机化学学报,2020,35(2):217-225.
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