ZnMnO 用于可见光照射下吸附和光降解甲基橙染料：动力学和等温线研究。
ZnMnO for adsorption and photo-degradation of methyl orange dye under visible irradiation: Kinetics and isotherms study.
机构信息
Department of Chemistry, Faculty of Science, Semnan University, Semnan, Iran.
Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran.
出版信息
Environ Res. 2022 Jan;203:111833. doi: 10.1016/j.envres.2021.111833. Epub 2021 Aug 14.
Three photocatalyst-adsorbents consist of ZnMnO, ZnMnO, and ZnMnO were synthesized by hydrothermal method and calcined at 800 °C. The structural and optical properties of the sample ZnMnO were characterized by using XRD; TEM; SEM; EDS; DLS; and DRS. The surface of the sample ZnMnO consists of nano-particles (<100 nm) and nano-holes (18.4 nm), also the band-gap of it was obtained 2.89 eV. Adsorption and photo-degradation of methyl orange (MO) dye was investigated in darkness and under visible light irradiation (200 W tungsten). The sample ZnMnO showed the most decolorization efficiency in the shortest time, so that 0.15 g of it adsorbed and destroyed the MO dye molecules (99 ± 1 %) in 40 s under irradiation. The most adsorption capacity of ZnMnO was obtained 30.06 mg/g and the mechanism of the dye adsorption was investigated by using BET analysis and zeta potential. Also the adsorption isotherm and kinetics were calculated for describing the adsorption of MO onto the ZnMnO.
三种光催化剂-吸附剂由水热法合成，在 800°C 下煅烧，得到 ZnMnO、ZnMnO 和 ZnMnO。采用 XRD、TEM、SEM、EDS、DLS 和 DRS 对样品 ZnMnO 的结构和光学性能进行了表征。样品 ZnMnO 的表面由纳米颗粒（<100nm）和纳米孔（18.4nm）组成，其能带隙为 2.89eV。在黑暗中和在可见光照（200W 钨丝灯）下研究了甲基橙（MO）染料的吸附和光降解。样品 ZnMnO 在最短的时间内表现出最高的脱色效率，因此在光照下，0.15g 的 ZnMnO 在 40s 内吸附并破坏了 MO 染料分子（99±1%）。ZnMnO 的最大吸附容量为 30.06mg/g，通过 BET 分析和动电位研究了染料吸附的机理。还计算了吸附等温线和动力学，以描述 MO 吸附到 ZnMnO 上的过程。
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