Shaikh Benazir, Bhatti Muhammad Ali, Shah Aqeel Ahmed, Tahira Aneela, Shah Abdul Karim, Usto Azam, Aftab Umair, Bukhari Sarah I, Alshehri Sultan, Shah Bukhari Syed Nizam Uddin, Tonezzer Matteo, Vigolo Brigitte, Ibhupoto Zaffar Hussain
Institute of Environmental Sciences, University of Sindh, Jamshoro 76080, Pakistan.
Wet Chemistry Laboratory, Department of Metallurgical Engineering, NED University of Engineering and Technology, Karachi 75270, Pakistan.
Nanomaterials (Basel). 2022 Oct 26;12(21):3754. doi: 10.3390/nano12213754.
In this study, we synthesized hybrid systems based on manganese oxide@zinc oxide (MnO@ZnO), using sol gel and hydrothermal methods. The hybrid materials exhibited hierarchical morphologies and structures characterized by the hexagonal phase of ZnO and the tetragonal phase of MnO. The hybrid materials were tested for degradation of methylene blue (MB), methyl orange (MO), and malachite green (MG) under ultraviolet (UV) light illumination. The aim of this work was to observe the effect of various amounts of MnO in enhancing the photocatalytic properties of ZnO-based hybrid structures towards the degradation of MB, MO and MG. The ZnO photocatalyst showed better performance with an increasing amount of MnO, and the degradation efficiency for the hybrid material containing the maximum amount of MnO was found to be 94.59%, 89.99%, and 97.40% for MB, MO and MG, respectively. The improvement in the performance of hybrid materials can be attributed to the high charge separation rate of electron-hole pairs, the co-catalytic role, the large number of catalytic sites, and the synergy for the production of high quantities of oxidizing radicals. The performance obtained from the various MnO@ZnO hybrid materials suggest that MnO can be considered an effective co-catalyst for a wide range of photocatalytic materials such as titanium dioxide, tin oxide, and carbon-based materials, in developing practical hybrid photocatalysts for the degradation of dyes and for wastewater treatment.
在本研究中，我们采用溶胶 - 凝胶法和水热法合成了基于氧化锰@氧化锌（MnO@ZnO）的混合体系。这些混合材料呈现出分级形态和结构，其特征在于ZnO的六方相和MnO的四方相。在紫外（UV）光照下，对这些混合材料进行了亚甲基蓝（MB）、甲基橙（MO）和孔雀石绿（MG）降解测试。这项工作的目的是观察不同含量的MnO对增强基于ZnO的混合结构对MB、MO和MG降解的光催化性能的影响。随着MnO含量的增加，ZnO光催化剂表现出更好的性能，发现含最大量MnO的混合材料对MB、MO和MG的降解效率分别为94.59%、89.99%和97.40%。混合材料性能的提高可归因于电子 - 空穴对的高电荷分离率、共催化作用、大量的催化位点以及产生大量氧化自由基的协同作用。从各种MnO@ZnO混合材料获得的性能表明，在开发用于染料降解和废水处理的实用混合光催化剂时，MnO可被视为二氧化钛、氧化锡和碳基材料等多种光催化材料的有效共催化剂。
