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沸石负载TiO2光催化剂的制备及其性能研究 总被引:1,自引:0,他引:1
以钛酸四丁酯和乙醇为原料,采用溶胶-凝胶(sol-gel)法制备以天然沸石为载体的负载型TiO2光催化剂,并利用X射线衍射(XRD)和扫描电镜(SEM)等对其进行结构表征.通过自行设计的光催化反应器,考查溶胶-凝胶体系的组成、焙烧温度及焙烧时间等因素对光催化剂降解造纸废水性能的影响,同时讨论该催化剂的可重复利用性,确定制备天然沸石负载型二氧化钛光催化剂的最佳实验条件:无水乙醇与钛酸四丁酯的体积比为4.0,冰醋酸与钛酸四丁酯的体积比为0.1,水与钛酸四丁酯的体积比为0.15,硝酸与钛酸四丁酯的体积比为0.1,焙烧温度为300℃,焙烧时间为4 h,造纸废水COD去除率可达81.93%. 相似文献
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Pure and different content europium(Eu) doped mesoporous titania were prepared by template method using Eu(NO3)3.6H2O andTi(OC4H9)4 as precursors and Pluronic P123 as template and characterized with X-ray diffraction(XRD),N2 adsorption-desorption measurements,and ultraviolet-visible diffuse absorption spectra.Their photocatalytic activities were studied by photodegradation phenol in water under visible light irradiation.The results showed that Eu doping restrained the growth of grain size and extended the p... 相似文献
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TiO_2 nanoparticles coated cotton fiber composite was successfully prepared by using a sol-gel method at low temperature(about 100℃) using tetrabutyl-titanate [Ti(OBu)_4] as raw material.The preparation of the TiO_2 colloid and the composite were described.The properties of resulting materials were characterized by SEM and XRD,the photocatalytic degradation performance was tested using methylene blue(MB) as the target pollutant in aqueous solution.The results showed that the amorphous TiO_2 nanoparticles were distributed evenly on the outer surfaces of cotton fibers,which shows efficient photocatalytic properties when exposed to UV light,the degradation rate of MB reached 95.35% under the conditions of catalyst dosage 2.5 g/L,MB concentration 50 mg/L,irradiation time 120 min,and pH 10,and the photocatalytic activity of TiO_2/cotton fibers remained above 90% of its activity as-prepared after being used four times,the degradation rate of MB could reach 88.78% when irradiation time was 120 min.The photocatalytic degradation of MB could be properly described by the first-order kinetic law.By comparison of the removal rates of MB with and without UV light,it could be affirmed that the disappearance of MB was due to photodegradation rather than adsorption on cotton fibers. 相似文献
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