Hierarchical Z-scheme 1D/2D architecture with TiO2 nanowires decorated by MnO2 nanosheets for efficient adsorption and full spectrum photocatalytic degradation of organic pollutants

摘要

Constructing composite photocatalysts with efficient photocatalytic activity, a wide optical response range and excellent stability has great significance for the removal of organic pollutants in water. Herein, we report a novel hierarchical Z-scheme 1D/2D architecture with TiO2 nanowires decorated by MnO2 nanosheets prepared using a simple vacuum freeze-drying method. X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and UV-visible diffuse reflectance spectroscopy (UV-vis DRS) analyses confirmed its composition, morphology, surface structure, chemical state and light absorption properties. In comparison to pristine TiO2 nanowires and sole MnO2 nanosheets, the as-prepared composite exhibited significantly enhanced adsorption and full spectrum photocatalytic activity for the removal of typical organic contaminants in water. Illumination could not only accelerate the degradation of rhodamine B (RhB) in the solution but also promote the decomposition of RhB adsorbed on the composite surface. Thereby, the composite still retained excellent adsorption and photocatalytic stability after three recycling runs. On the basis of the hierarchical structure of the composite, the generation of hydroxyl radicals (center dot OH) and superoxide radicals (center dot O-2(-)) in the dark and the direct Z-scheme photocatalytic mechanism, the adsorption and photocatalytic performance enhancement of the composite was well elucidated. This work provides an effective approach to construct hierarchical 1D/2D photocatalysts for efficient adsorption and full spectrum photocatalytic degradation of organic contaminants in water.

机译：构建复合催化剂高效的光催化活性,广泛的光响应范围和优秀的稳定有很大意义的有机食品污染物在水里。分层Z-scheme 1 d和2 d体系结构通过汇总nanosheets二氧化钛纳米线装饰准备使用一个简单的真空冷冻干燥方法。场发射电子显微镜(SEM)扫描电子显微镜(FESEM),透射电子显微镜(TEM)、高分辨率透射电子显微镜(HRTEM)、氮adsorption-desorption x射线光电子能谱(XPS)和紫外可见漫反射光谱(紫外可见DRS)分析证实了它的组成、形态、表面结构、光和化学状态吸收特性。二氧化钛纳米线和唯一的汇总nanosheets,和综合表现出显著增强吸附和全谱的光催化活性典型有机污染物在水里。照明不仅可以加快降解罗丹明B (RhB)解决方案但也促进RhB的分解在复合表面吸附。复合仍然保留优秀的吸附和光催化稳定后三个回收运行。复合,羟基的生成激进分子(中心点哦)和超氧化物自由基(中间点0 2(-))在黑暗和直接Z-scheme光催化机理、吸附及光催化性能的增强复合了。一种有效的方法来构造层次1 d和2 d为高效的吸附和催化剂全光谱的光催化降解有机污染物在水里。

Hierarchical Z-scheme 1D/2D architecture with TiO2 nanowires decorated by MnO2 nanosheets for efficient adsorption and full spectrum photocatalytic degradation of organic pollutants

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