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Graphene and MOFs co-modified composites for high adsorption capacity and photocatalytic performance to remove pollutant under both UV- and visible-light irradiation
Journal of Solid State Chemistry ( IF 3.3 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.jssc.2020.121215
Bo Tang , Yuanzhe Dai , Yunfei Sun , Haiqun Chen , Zhengwei Wang

Various metal organic frameworks (MOFs) including ZIF-8, Uio-66 and Cu-BTC are prepared and adopted with reduced graphene oxide (RGO) to co-modify TiO2. The resulting composite photocatalysts display high photocatalytic performances under both UV- and visible-light irradiation, and the corresponding photocatalytic mechanisms are revealed by considering the electronic structures and morphologies of these ingredients, which are proven by IR curves, STM patterns, lifetime of photoinduced electrons. The influences of BET areas and pore diameters of the adopted MOFs on the resulting photocatalytic properties are studied, and the specific influence of interaction between TiO2 and RGO on the observed photocatalytic activities are also discussed. The large BET areas of the MOFs endow high adsorption capacities to the resulting photocatalysts, while the closely chemical contact between TiO2 and RGO achieves the visible-light activity. After optimization, the degradation rate constants of rhodamine-B reach 1.65 × 10-1 min-1 and 1.12 × 10-1 min-1 under UV- and visible-light irradiation, respectively.



中文翻译:

石墨烯和MOFs共改性复合材料,具有高吸附能力和光催化性能,可在紫外线和可见光照射下去除污染物

制备了包括ZIF-8,Uio-66和Cu-BTC在内的各种金属有机骨架(MOF),并与还原型氧化石墨烯(RGO)一起用于共改性TiO 2。所得的复合光催化剂在紫外光和可见光照射下均显示出高光催化性能,并通过考虑这些成分的电子结构和形态揭示了相应的光催化机理,这通过红外曲线,STM图案,光生电子的寿命得到了证明。 。研究了BET面积和所采用MOF的孔径对所得光催化性能的影响,以及TiO 2之间相互作用的具体影响还讨论了RGO和RGO对所观察到的光催化活性的影响。MOF的大BET区域赋予了所得光催化剂高吸附能力,而TiO 2和RGO之间的紧密化学接触实现了可见光活性。优化后,若丹明B的降解速率常数在紫外线和可见光照射下分别达到1.65×10 -1 min -1和1.12×10 -1 min -1

更新日期:2020-01-24
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