School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
J Hazard Mater. 2012 Aug 30;229-230:72-82. doi: 10.1016/j.jhazmat.2012.05.061. Epub 2012 May 28.
BiOI-MWCNT composites, with high absorption and visible-light photocatalytic performance, were synthesized by a solvothermal process, in which ethylene glycol (EG) participated in the reaction. Synthesized BiOI-MWCNT composites were characterized by X-ray diffraction (XRD), diffuse reflectance spectra (DRS), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), and electrochemical impedance spectroscopy (EIS). The results showed that the prepared BiOI-MWCNT composites exhibit strong adsorption ability with the increase of doped MWCNT amount. The efficiency of AOII degradation increased with the increase of MWCNT amount from 0.5 to 1.0% significantly. The photocatalytic degradation of AOII using BiOI-MWCNT composites under visible light (λ>400 nm) was almost completed within 180 min. BiOI-MWCNT composites maintained its degradation efficiency and durability after being reused for 5 batch runs. The high adsorption ability and degradation efficiency of BiOI-MWCNT for AOII was attributed to the sorption of doped MWCNT and the effective charge transfer from excited BiOI to MWCNTs, respectively. Moreover, organic compounds as intermediates of the degradation process were identified by LC/MS.
BiOI-MWCNT 复合材料通过溶剂热法合成，其中乙二醇（EG）参与反应，具有高吸收和可见光光催化性能。合成的 BiOI-MWCNT 复合材料通过 X 射线衍射（XRD）、漫反射光谱（DRS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和电化学阻抗谱（EIS）进行了表征。结果表明，所制备的 BiOI-MWCNT 复合材料具有随着掺杂 MWCNT 量的增加而增强的吸附能力。AOII 降解效率随着 MWCNT 量从 0.5%增加到 1.0%而显著提高。BiOI-MWCNT 复合材料在可见光（λ>400nm）下几乎在 180 分钟内完成了对 AOII 的光催化降解。BiOI-MWCNT 复合材料在 5 批重复使用后仍保持其降解效率和耐久性。BiOI-MWCNT 对 AOII 的高吸附能力和降解效率归因于掺杂 MWCNT 的吸附和从激发的 BiOI 到 MWCNTs 的有效电荷转移。此外，通过 LC/MS 鉴定了降解过程中的有机化合物作为中间产物。
