摘要
采用NaBH4还原法合成了系列Pt沉积的Ag2CO3复合光催化剂。通过在可见光照射下降解甲基橙研究沉积不同含量的Pt对Ag2CO3光催化性能的影响。应用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电镜(TEM)、光电子能谱(XPS)、傅立叶变换红外光谱(FT-IR)、光致发光光谱(PL)、紫外可见漫反射吸收光谱(DRS)、光电流(PC)和N2物理吸附等研究了沉积Pt纳米颗粒对Ag2CO3纳米晶的物理化学性质的影响。结果表明,沉积质量分数为0.1%~0.5%的Pt,可使Ag2CO3的活性提升3倍以上,同时光催化剂的稳定性得到极大改善。Pt/Ag2CO3光催化性能大幅提升的主要原因是,沉积少量的Pt可以增强Ag2CO3对可见光的吸收,同时增大Ag2CO3的比表面积和表面羟基的数量;另外,沉积在Ag2CO3表面的Pt粒子可以承担电子俘获中心的作用,使Ag2CO3中光激发产生的电子(e^-)有效地转移到Pt上,加速光生电子-空穴对的分离速率,产生更多的光催化活性自由基,在提升光催化活性的同时,减少Ag2CO3中的Ag+被光生电子(e^-)还原的几率,增强Ag2CO3的抗光腐蚀能力。
A series of Pt-Ag2CO3 composite photocatalysts were synthesized via NaBH4 reduction method.Pt deposition effects on photocatalytic performance of Ag2CO3 were evaluated by photocatalytic degradation of methyl orange under visible light irradiation.The influence of Pt deposition on the physicochemical properties of Ag2CO3 crystal were investigated by X-ray diffraction (XRD),scanning electron microscope (SEM),transmission electron microscope (TEM),X-ray photoelectron spectroscopy (XPS),Fourier translation infrared spectroscopy (FT-IR),photoluminescence (PL) emission spectroscopy,and UV-Vis diffuse reflectance spectra (UV-Vis DRS),photocurrent (PC),and N2 physical adsorption.The results show that deposition of 0.1%~0.5%(w/w) concentration of Pt brought about 3 times photocatalytic activity of the Ag2CO3 and the stability was largely promoted.The presence of Pt brings about the strong visible light absorption and the increase of surface area and amount of -OH groups.Besides,the presence of Pt deposited on Ag2CO3 can retard fast charge-pair recombination by serving as an electron sink to facilitate the separation of photogenerated electrons (e^-) and holes (h^+).Therefore,more e^- and h^+ are available for production more radicals to decompose the organic dyes.The fast transfer rate of electrons can also reduce the photoreduction (Ag^++e → Ag) and increase the ability of Ag2CO3 to resist the photocorrosion.
作者
陈范云
张萌迪
马小帅
李家德
余长林
CHEN Fan-Yun;ZHANG Meng-Di;MA Xiao-Shai;LI Jia-De;YU Chang-Lin(School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Faculty of Environmental Science and Engineering,Guangdong University ofPetrochemical Technology,Maoming,Guangdong 525000,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2019年第6期1034-1040,共7页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(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)
广东省扬帆支持计划资助项目
