La-doped TiO2 nanopowders were synthesized via sol-gel process,and X-ray diffraction(XRD),UV-visble absorption spectra techniques were applied to investigated thes phase structure and spectrum properties as-synthesize...La-doped TiO2 nanopowders were synthesized via sol-gel process,and X-ray diffraction(XRD),UV-visble absorption spectra techniques were applied to investigated thes phase structure and spectrum properties as-synthesized samples.The influence of La3+ doping on the structure and phase transformation behaviors of anatase to rutile TiO2 powders was investigated by means of XRD.UV-vis adsorption spectroscopy revealed that La-doped TiO2 has a strong a adsorption band and the absorption edge were red-shifted compartion with pure TiO2.The experiment results of photocatalytic decomposition of methyl-organge indicated that La-doping restrained the transformation of anatase to rutile and growth of grain.Therefore,La-doping improved the TiO2 photocatalytic activity in photodegradation of methyl-organge.In addition,experiments also illustrate that the catalyst has good activity of decolor rate of Yan’an cigarette factory wastewater.展开更多
The present study involves the preparation of TiO2/SiO2 nanocrystals and their application in self-clcaning wool-polyester fabrics. The TiO2/SiO2 nanocrystals were successfully synthesized and deposited onto wool-poly...The present study involves the preparation of TiO2/SiO2 nanocrystals and their application in self-clcaning wool-polyester fabrics. The TiO2/SiO2 nanocrystals were successfully synthesized and deposited onto wool-polyester fabrics using the low-temperature sol-gel technique. The as-prepared nanoeomposites and the nanocomposites coated samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The XRD and SEM results showed that the single-phase anatase nanocrystallites were formed and loaded on the fabric surface successfully. The photocatalytic activities of TiO2 -coated and TiO2/SiO2-coated wool-polyester fabrics were measured by studying photodegradation of methylene blue dye. Comparison of the photocatalytic activity of the coated samples reveals superiority of TiO2/SiO2 modified sample with respect to that of pure TiO2 modified sample. Our observations indicate that by applying this technique to the fabrics, self-cleaning materials can be designed for practical application.展开更多
在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组...在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组成、形貌及结构进行分析,以亚甲基蓝(MB)为降解有机污染物目标,降解MB溶液前后的浓度比值(ct/c0)为评价指标,对催化剂种类及催化剂的用量进行了优化研究。结果表明,TiO2/MoS2@硅藻土复合催化剂稳定性高,催化活性强,1 mg/mL该复合催化剂降解50 mL 3~10 mg/L的MB溶液,ct/c0值范围为0.015~0.048。降解过程符合一级反应动力学Langmuir-Hinshelwood方程。展开更多
文摘La-doped TiO2 nanopowders were synthesized via sol-gel process,and X-ray diffraction(XRD),UV-visble absorption spectra techniques were applied to investigated thes phase structure and spectrum properties as-synthesized samples.The influence of La3+ doping on the structure and phase transformation behaviors of anatase to rutile TiO2 powders was investigated by means of XRD.UV-vis adsorption spectroscopy revealed that La-doped TiO2 has a strong a adsorption band and the absorption edge were red-shifted compartion with pure TiO2.The experiment results of photocatalytic decomposition of methyl-organge indicated that La-doping restrained the transformation of anatase to rutile and growth of grain.Therefore,La-doping improved the TiO2 photocatalytic activity in photodegradation of methyl-organge.In addition,experiments also illustrate that the catalyst has good activity of decolor rate of Yan’an cigarette factory wastewater.
基金the Fundamental Research Funds for the Central Universities,China，China Postdoctoral Science
文摘The present study involves the preparation of TiO2/SiO2 nanocrystals and their application in self-clcaning wool-polyester fabrics. The TiO2/SiO2 nanocrystals were successfully synthesized and deposited onto wool-polyester fabrics using the low-temperature sol-gel technique. The as-prepared nanoeomposites and the nanocomposites coated samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The XRD and SEM results showed that the single-phase anatase nanocrystallites were formed and loaded on the fabric surface successfully. The photocatalytic activities of TiO2 -coated and TiO2/SiO2-coated wool-polyester fabrics were measured by studying photodegradation of methylene blue dye. Comparison of the photocatalytic activity of the coated samples reveals superiority of TiO2/SiO2 modified sample with respect to that of pure TiO2 modified sample. Our observations indicate that by applying this technique to the fabrics, self-cleaning materials can be designed for practical application.
文摘在异丙醇水溶液中以钛酸丁酯为钛源,MoS2为敏化剂,硅藻土为负载剂,通过溶胶-凝胶法和水热法制备TiO2/MoS2@硅藻土的复合光催化剂。通过傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、漫反射光谱(DRS)、扫描电镜(SEM)和N2吸附-脱附对催化剂组成、形貌及结构进行分析,以亚甲基蓝(MB)为降解有机污染物目标,降解MB溶液前后的浓度比值(ct/c0)为评价指标,对催化剂种类及催化剂的用量进行了优化研究。结果表明,TiO2/MoS2@硅藻土复合催化剂稳定性高,催化活性强,1 mg/mL该复合催化剂降解50 mL 3~10 mg/L的MB溶液,ct/c0值范围为0.015~0.048。降解过程符合一级反应动力学Langmuir-Hinshelwood方程。
