Engineering Research Center for Molecular Medicine, School of Basic Medical Sciences, Guizhou Medical University, Guiyang 550025, China.
Int J Mol Sci. 2022 Sep 2;23(17):10003. doi: 10.3390/ijms231710003.
In this study, we first manufactured ultrathin g-CN (CN) nanosheets by thermal etching and ultrasonic techniques. Then, EuVO (EV) nanoparticles were loaded onto CN nanosheets to form EuVO/g-CN heterojunctions (EVCs). The ultrathin and porous structure of the EVCs increased the specific surface area and reaction active sites. The formation of the heterostructure extended visible light absorption and accelerated the separation of charge carriers. These two factors were advantageous to promote the synergistic effect of adsorption and photocatalysis, and ultimately enhanced the adsorption capability and photocatalytic removal efficiency of methylene blue (MB). EVC-2 (2 wt% of EV) exhibited the highest adsorption and photocatalytic performance. Almost 100% of MB was eliminated via the adsorption-photocatalysis synergistic process over EVC-2. The MB adsorption capability of EVC-2 was 6.2 times that of CN, and the zero-orderreaction rate constant was 5 times that of CN. The MB adsorption on EVC-2 followed the pseudo second-order kinetics model and the adsorption isotherm data complied with the Langmuir isotherm model. The photocatalytic degradation data of MB on EVC-2 obeyed the zero-order kinetics equation in 0-10 min and abided by the first-order kinetics equation for10-30 min. This study provided a promising EVC heterojunctions with superior synergetic effect of adsorption and photocatalysis for the potential application in wastewater treatment.
在这项研究中，我们首先通过热刻蚀和超声技术制造了超薄 g-CN（CN）纳米片。然后，将 EuVO（EV）纳米颗粒负载到 CN 纳米片上，形成 EuVO/g-CN 异质结（EVCs）。EVCs 的超薄和多孔结构增加了比表面积和反应活性位点。异质结构的形成扩展了可见光吸收并加速了载流子的分离。这两个因素有利于促进吸附和光催化的协同作用，最终提高了亚甲基蓝（MB）的吸附能力和光催化去除效率。EVC-2（EV 的 2wt%）表现出最高的吸附和光催化性能。通过 EVC-2 的吸附-光催化协同过程，几乎 100%的 MB 被消除。EVC-2 的 MB 吸附能力是 CN 的 6.2 倍，零级反应速率常数是 CN 的 5 倍。MB 在 EVC-2 上的吸附遵循准二级动力学模型，吸附等温线数据符合 Langmuir 等温线模型。EVC-2 上 MB 的光催化降解数据在 0-10min 内遵循零级动力学方程，在 10-30min 内遵循一级动力学方程。本研究提供了一种具有优异吸附和光催化协同效应的 EVC 异质结，有望在废水处理中得到应用。
