Structure Sensitivity Study of Waterborne Contaminant Hydrogenation Using Shape- and Size-Controlled Pd Nanoparticles
作者:Danmeng Shuai、Dorrell C. McCalman、Jong Kwon Choe、John R. Shapley、William F. Schneider、Charles J. Werth
DOI:10.1021/cs300616d
日期:2013.3.1
nanoparticles. Density functional theory (DFT) simulations for the free energy change of hydrogen (H2), nitrite, and nitric oxide (NO) adsorption and a two-site model based on the Langmuir–Hinshelwood mechanism suggest that competition of adsorbates for different Pd sites can explain the TOF0 results. Our study shows for the first time that catalytic reduction activity for waterborne contaminant removal
钯催化还原已成为一种从饮用水中去除一系列污染物(如氧阴离子,消毒副产物和卤化污染物)的有前途的技术,但低活性是应用的主要挑战。为了应对这一挑战,我们合成了一组形状-和尺寸控制的钯纳米粒子并进行评价三个探针污染物活性(即,亚硝酸盐,Ñ -nitrosodimethylamine(NDMA),泛影葡胺和)作为小面类型的函数(例如, (100),(110),(111)),低配位点与高配位点的比例以及表面位点与总Pd的比例(即分散度)。初始污染物浓度为100μM的还原结果表明初始周转频率(TOF 0)对于亚硝酸盐而言,随着(100)个表面Pd位点百分比的增加(从0%到95.3%)增加4.7倍,而NDMA和泛影酸盐的TOF 0分别增加4.5-和3.6倍,随着百分比的增加平台表面的Pd部位(从79.8%到95.3%)。亚硝酸盐初始浓度为2 mM的结果表明,对于所有形状和大小受控的Pd纳米粒子,TOF 0均相同。结果表明,TOF