MIL-125/4N-TiO_2复合光催化材料的制备及其光催化性能研究
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摘要
通过凝胶-溶胶法、水热法分别制备了4N-TiO_2纳米粒子和MIL-125 MOFs两种材料。通过配位自组装法制备了复合材料MIL-125/4N-TiO_2。分别通过扫描电镜、红外光谱、XRD、N2吸附-脱附等手段对所制备的复合材料进行了表征。分析表明,得到了MIL-125/4N-TiO_2复合材料。通过光催化降解罗丹明6G模型化合物,发现复合材料具有光催化降解能力,并发现在pH为7的条件下,MIL-125与4N-TiO_2的比例为1∶1时,降解罗丹明6G效率最高,可达98.12%;MIL-125与4N-TiO_2的比例为3∶1时,吸附罗丹明6G效率最高,可达63.7%。通过分析光催化前后产物,得出该复合光催化剂能够吸附并光降解罗丹明6G。
4N-TiO_2 particles and MIL-125 were prepared by the sol-gel method and hydrothermal method respectively.The MIL-125/4N-TiO_2 were prepared by coordination reaction induced self-assembly route.The MIL-125/4N-TiO_2 was characterized by scanning electron microscope(SEM),infrared spectroscopy(IR),X-ray diffraction(XRD)and nitrogen adsorption-desorption isotherm.Based on the results,it was found that MIL-125/4N-TiO_2 was synthesized successfully.Through the photocatalytic degradation of rhodamine 6 Gmodel compounds,the composite had the property of photocatalytic degradation.When pH value was 7,the ratio of MIL-125 and 4N-TiO_2 was 1∶1,the degradation ratio was the best of 98.12%.When the ratio of MIL-125 to 4N-TiO_2 was 3∶1,the adsorption ratio was 63.7%.By comparing the infrared spectra of composites before and after photocatalytic oxidation,it was concluded that the composite was able to adsorb rhodamine 6 G,and then photocatalytic degraded it.
4N-TiO_2 particles and MIL-125 were prepared by the sol-gel method and hydrothermal method respectively.The MIL-125/4N-TiO_2 were prepared by coordination reaction induced self-assembly route.The MIL-125/4N-TiO_2 was characterized by scanning electron microscope(SEM),infrared spectroscopy(IR),X-ray diffraction(XRD)and nitrogen adsorption-desorption isotherm.Based on the results,it was found that MIL-125/4N-TiO_2 was synthesized successfully.Through the photocatalytic degradation of rhodamine 6 Gmodel compounds,the composite had the property of photocatalytic degradation.When pH value was 7,the ratio of MIL-125 and 4N-TiO_2 was 1∶1,the degradation ratio was the best of 98.12%.When the ratio of MIL-125 to 4N-TiO_2 was 3∶1,the adsorption ratio was 63.7%.By comparing the infrared spectra of composites before and after photocatalytic oxidation,it was concluded that the composite was able to adsorb rhodamine 6 G,and then photocatalytic degraded it.
引文
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[4]董泽民.纳米复合界面的构筑及其在光催化中应用的研究[D].南昌:华东交通大学,2014.
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[6]Hoffmann M R,Choi W,Bahnemann D W.Environmental applications of semiconductor photocatalysis[J].Chemical Reviews,1995,95(1):69-96.
[7]Zhu J,Deng Z,Chen F,et al.Hydrothermal doping method for preparation of Cr3+-TiO2,photocatalysts with concentration gradientdistribution of Cr3+[J].Applied Catalysis B Environmental,2006,62(3/4):329-335.
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[12]Hang N T P,Truong N D,Nguyen L T,et al.Enhancement of the visible light photocatalytic activity of vanadium and nitrogen co-doped TiO2thin film[J].Journal of Nonlinear Optical Physics&Materials,2016,25(4).
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