超细铂纳米催化剂的光化学合成及其催化还原硝基苯酚的应用

Photochemical synthesis of ultrafine platinum nanocatalysts and their application in the catalytic reduction of nitrophenols

以乙二醇(EG)为还原剂,通过波长为395 nm近紫外光和450、650 nm的可见光照射C_(60)及K_(2)[PtCl_(4)]混合液,制备了超细铂纳米颗粒(Pt/C_(60)-E)。利用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)以及高分辨率透射电子显微镜(HR-TEM)等表征手段对Pt/C_(60)催化剂的组成及形貌进行了研究,结果表明,铂纳米颗粒在C_(60)表面分散良好,平均粒径约为2.6 nm。在催化p-NP还原实验中,在近紫外光(395 nm)照射下所制备催化剂(Pt/C_(60)-E3)表现出最高的催化活性,其速率常数k=0.12 min^(-1)。在催化剂循环实验中,多次循环催化剂仍具有较高的活性,实验证明光化学法对前驱体铂催化剂制备起到良好的作用。

This study focuses on synthesizing ultrafine platinum nanoparticles(Pt/C_(60)-E)by irradiating a mixture of C_(60) and K_(2)[PtCl_(4)]with ethylene glycol(EG)as the reducing agent.The process utilizes near-ultraviolet(UV)light at a wavelength of 395 nm,along with visible light at 450 and 650 nm.The composition and morphology of the Pt/C_(60) catalyst were investigated using characterization techniques including X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and high-resolution transmission electron microscopy(HR-TEM).The results revealed a well-dispersed distribution of Pt nanoparticles on the C_(60) surface,with an average particle size of about 2.6 nm.In the catalytic reduction experiments of p-NP,the Pt/C_(60)-E3 catalyst,prepared under near-ultraviolet irradiation(395 nm),exhibited superior catalytic activity,with a rate constant(k)of 0.12 min−1.Furthermore,in the catalyst cycling experiments,the catalysts remained highly active even after multiple cycles,demonstrating the effectiveness of the photochemical method in synthesizing precursor Pt catalysts.