上海市磁共振重点实验室

牛星星同学于Environmental Science: Nano期刊发表文章

发布日期: 2020-08-30   作者:   浏览次数: 26


实验室牛星星等同学在Environmental Science: Nano 期刊发表了题为《Enhanced photocatalytic reduction of Cr(VI) to Cr(III) over g-C3N4 catalysts with Ag nanoclusters in conjunction with Cr(III) quantification based on operando low-field NMR relaxometry》的文章,通讯作者为姚叶锋老师和王雪璐老师,发表日期为2020813日。(DOI: 10.1039/D0EN00384K

 


The design of efficient semiconductor photocatalysts to promote solar-to-chemical conversion remains a tremendous challenge. The present study addresses this issue by loading Ag9(H2MSA)7 and Ag32(MPG)19 nanoclusters (NCs) onto graphitic carbon nitride (g-CN) using a simple impregnation method to form Ag9NCs/g-CN and Ag32NCs/g-CN hybrid nanocomposites. The performance of the prepared photocatalyst samples investigated for the photocatalytic reduction of aqueous Cr(VI) to Cr(III) under visible-light irradiation is systematically investigated. The proposed nanocomposites exhibit excellent optical absorption properties and efficient separation and migration of photogenerated electron-hole pairs. As a result, the Ag9NCs/g-CN and Ag32NCs/g-CN nanocomposites provide improved photocatalytic performances relative to that of pristine g-CN photocatalysts with reduction rate constants that are greater than that of pristine g-CN by factors of 2.3 and 2.0, respectively. Furthermore, we for the first time demonstrate the viability of employing operando low-field NMR relaxometry for monitoring the photocatalytic Cr(VI) reduction performance by quantifying the concentration of paramagnetic Cr(III) ions in solution using the transverse relaxation times determined from the Carr-Purcell-Meiboom-Gill pulse sequence. Our study provides new insights for the rational design of high efficiency visible-light photocatalysts, and develops a more efficient method for quantifying the photocatalytic performance of catalysts for transforming heavy metal ions.