Abstract

CoO/HTi₂NbO₇-NS nanocomposite was constructed via the composite procedure of HTi₂NbO₇ nanosheet (HTi₂NbO₇-NS) and cobalt oxide nanoparticles (CoO-NPs) by a hydrothermal method. The as-prepared samples were characterized by XRD, HRTEM, EDS, LRS, XPS, and UV-Vis DRS. The adsorption and photocatalytic performances of the as-prepared samples were evaluated using ethyl mercaptan (EM) in methane gas as the model pollutant. Results indicated that CoO-NPs were uniformly distributed on the surface of HTi₂NbO₇-NS. The interfacial p-n heterojunction was formed. The spectral absorption edge of CoO/HTi₂NbO₇-NS was significantly red-shifted and the band gap was narrowed compared with HTi₂NbO₇-NS due to the interaction. The results also shown that CoO/HTi₂NbO₇-NS has the largest adsorption capacity for EM at 340.5 μmol g⁻¹ and the strongest photocatalytic oxidation performance, the EM could be photocatalytic oxidized to sulfoxide. The present work indicated that the p-n heterojunction material of the CoO/HTi₂NbO₇-NS was promising for mercaptans adsorption and degradation.

摘要

CoO/HTi ₂ NbO ₇ -NS纳米复合材料是通过HTi ₂ NbO ₇纳米片（HTi ₂ NbO ₇ -NS）和氧化钴纳米颗粒（CoO-NPs）的水热法复合工艺构建的。所制备的样品通过 XRD、HRTEM、EDS、LRS、XPS 和 UV-Vis DRS 进行了表征。使用甲烷气体中的乙硫醇（EM）作为模型污染物，评估了所制备样品的吸附和光催化性能。结果表明CoO-NPs均匀分布在HTi ₂ NbO ₇ -NS表面。形成了界面pn异质结。_{CoO/HTi 2} NbO的光谱吸收边_{与HTi 2} NbO ₇ -NS相比，由于相互作用，₇ -NS显着红移，带隙变窄。结果还表明，CoO/HTi ₂ NbO ₇ -NS对EM的吸附量最大，为340.5 μmol g ^-1和最强的光催化氧化性能，可以将EM光催化氧化为亚砜。目前的工作表明，CoO/HTi ₂ NbO ₇ -NS的pn异质结材料在硫醇的吸附和降解方面很有前景。