School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China.
J Hazard Mater. 2017 Jan 5;321:162-172. doi: 10.1016/j.jhazmat.2016.09.013. Epub 2016 Sep 5.
Three-dimensional (3D) MnO porous hollow microspheres (δ- and α- MnO PHMSs), with high adsorption and catalytic ozonation performance, were synthesized by a self-template (MnCO microspheres) process at room temperature. The synthesized MnO PHMSs were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area. The results showed that PHMSs exhibit the excellent adsorption ability and catalytic activity owning to their hollow spherical structure, mesoporous shell and well-defined interior voids, leading to the strong adsorption for bisphenol A (BPA) and the retention of O molecules on catalyst. Moreover, the catalytic performance of α-MnO PHMSs was better than that of δ-MnO PHMSs which was attributed to the richer lattice oxygen of α-MnO PHMSs to accelerate O decomposition by producing more reactive oxidative species. The degradation efficiency of BPA using 3D α-MnO PHMSs was more than 90% in the presence of ozone within 30min reaction time. The probe tests for reactive oxidative species (ROSs) displayed that BPA degradation by catalytic ozonation is dominated by O and OH in our present study. Furthermore, the organic compounds as intermediates of the degradation process were identified by LC/MS.
三维（3D）MnO 多孔空心微球（δ-MnO 和 α-MnO PHMSs），具有高吸附和催化臭氧化性能，通过室温下的自模板（MnCO 微球）工艺合成。合成的 MnO PHMSs 通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和 Brunauer-Emmett-Teller（BET）表面积进行了表征。结果表明，PHMSs 由于其空心球形结构、介孔壳和明确的内部空隙，表现出优异的吸附能力和催化活性，对双酚 A（BPA）具有很强的吸附能力，并保持催化剂上的 O 分子。此外，α-MnO PHMSs 的催化性能优于 δ-MnO PHMSs，这归因于 α-MnO PHMSs 中更丰富的晶格氧通过产生更多的活性氧化物种来加速 O 的分解。在 30min 的反应时间内，在臭氧存在下，使用 3Dα-MnO PHMSs 对 BPA 的降解效率超过 90%。活性氧化物种（ROSs）的探针测试表明，在本研究中，催化臭氧化降解 BPA 主要由 O 和 OH 主导。此外，通过 LC/MS 鉴定了降解过程中有机化合物作为中间产物。
