摘要
采用一步水热法制备核壳结构Fe_3O_4@C微米粒子,通过比表面积及孔径分析仪、X射线衍射仪、透射电子显微镜、傅里叶变换红外光谱仪等对粒子结构和形貌进行表征,并研究了粒子作为非均相催化剂在UV-Fenton氧化去除挥发性有机物(VOCs)中的作用机制.结果表明,核壳结构Fe_3O_4@C粒子由于包覆了孔隙状碳层而具有较强的吸附能力,可显著增加VOCs气体分子与Fenton试剂的接触几率,有助于提高VOCs的去除效率.通过计算反应速率常数及协同因子,证实在核壳结构Fe_3O_4@C粒子去除VOCs的过程中存在吸附-催化氧化协同作用.
The solvothermal method was used to prepare Fe_3O_4@C core-shell microspheres. The structure and morphology of the nanocomposite powders were characterized by X-ray diffraction,transmission electron microscopy,and Fourier transform infrared spectroscopy,and then the particles were used as heterogeneous catalysts in the UV-Fenton removal of VOCs in gas. The results show that the Fe_3O_4@C core-shell microspheres have a strong adsorption capacity for VOCs due to the outer layer of Fe_3O_4 being coated with a carbon layer of uniform thickness and pore structure. For sparingly soluble organic gases such as octane,the adsorption of these particles could increase the total concentration of VOCs in the liquid phase. Therefore,the opportunity for the Fenton reagent to be incontact with the VOCs gas increases,causing a significant improvement in the gas removal efficiency. Moreover,the cooperation factorβ was introduced to evaluate the synergistic effects in the integrated process of the adsorption-catalytic oxidation by the core-shell structure particles.
出处
《工程科学学报》
EI
CSCD
北大核心
2017年第8期1166-1173,共8页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(21576023
21407008)
国家重点研发计划资助项目(2016YFE0115500
2016YFC0700603)
中央高校基本科研业务费资助项目(FRF-TP-15-080A1)
国家水体污染控制与治理科技重大专项资助项目(2015ZX07205003)
