Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Aug;94:18-22. doi: 10.1016/j.saa.2012.03.047. Epub 2012 Mar 29.
MCM-41 molecular sieve coupled with lead sulfide quantum dots (PbS-MCM-41) was prepared by ion-exchange method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis spectroscopy, infrared spectroscopy (IR) and BET (Brunauer-Emmett-Teller) experiments. Exciton absorption peak at higher energy than the fundamental absorption edge of bulk lead sulfide indicates quantum confinement effects in quantum dots as a consequence of their small size. The hydrogen production rate from water photocatalytic decomposition under visible light irradiation (λ>400nm) over PbS nanoparticles formed in mesoporous material was much higher compared to the bulk PbS.
MCM-41 分子筛与硫化铅量子点（PbS-MCM-41）通过离子交换法制备。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、紫外可见光谱（UV-vis）、红外光谱（IR）和 BET（Brunauer-Emmett-Teller）实验对催化剂进行了表征。与体相硫化铅的基本吸收边缘相比，更高能量的激子吸收峰表明量子点中的量子限域效应是由于其尺寸较小所致。与体相 PbS 相比，在可见光（λ>400nm）照射下，在介孔材料中形成的 PbS 纳米粒子光催化分解水产生的氢气速率要高得多。
