活性炭纤维负载二氧化钛光催化剂的制备、改性及性能研究
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摘要
为了提高TiO_2的光催化活性和抗菌能力,对TiO_2的载体进行了筛选,并对以ACF为载体的二氧化钛光催化剂的制备、改性及性能进行研究。
(1)采用TiO_2作催化剂,通过大量试验,选择比表面积大,吸附能力强的活性炭纤维做催化剂载体。以亚甲基蓝降解为目标污染物,通过优化负载方法和光催化氧化反应条件达到去除水中有机污染物的目的。
(2)以钛酸四丁酯为前驱物,活性炭纤维(ACF)为载体,蔗糖为胶粘剂,采用真空吸附水解的方法制得了TiO_2/ACF催化剂。采用BET、XRD、SEM等手段对其物理化学特性进行表征,以四氯乙烯光降解反应为探针反应考察了TiO_2/ACF催化剂的光催化降解性能。实验结果表明,采用真空吸附水解法可以将TiO_2很好地负载到活性炭纤维表面上。通过优化条件制备的TiO_2/ACF催化剂在光照2h条件下,可以将水中溶解量的四氯乙烯降解90%以上。催化剂可以多次循环使用,光催化反应活性不变。
(3)以钛酸四丁酯为前躯体,活性炭纤维(ACF)为载体,蔗醣为粘结剂,采用真空吸附水解法制备了TiO_2/ACF催化剂。采用浸渍法,在TiO_2/ACF表面负载上银纳米颗粒,制得Ag-TiO_2/ACF光降解-抗菌复合材料。利用BET、XRD、SEM等方法对催化剂进行了表征。研究了Ag-TiO_2/ACF在光照下对亚甲基蓝的降解作用和对大肠杆菌的杀灭效果。结果表明,Ag-TiO_2/ACF复合材料在光照2h下,可以将水中溶解量的亚甲基蓝降解97%以上。当Ag含量为0.75wt%时,Ag-TiO_2/ACF对大肠杆菌具有很强的灭杀作用。
In order to improve the photocatalytic activity and bactericidal properties, select the ACF to load titanium dioxide, and research the Preparation, modification and its properties of the Activated Carbon Fibre-Supported TiO_2 Catalyst:
(1) TiO_2 was used as catalyst in my experiment ,by many experiment ,we selected activated carbon fibre as carrier, because it had large specific surface area and good adsorption capacity. Using methylene. blue as target pollutant in aqueous solution to optimize TiO_2 material and reaction condition increased the photocatalytic oxidation efficiency.
(2) Photocatalysts of TiO_2 supported on activated carbon fibre were prepared by means of vacuum adsorption-hydrolysis method, using sucrose as a binder between TiO_2 and ACF. The TiO_2/ACF catalysts were characterized by BET, XRD, and SEM. The photodegradation activity of TiO_2/ACF was investigated with tetrachloroethylene (TCE) as a probe molecule. The results indicate that TiO_2 can be loaded on the surface of the ACF perfectly through the vacuum absorption-hydrolysis method. The photodegradation yield of TCE in aqueous solution is beyond 90% using the catalyst prepared in optimum method under the UV-visible light irradiation for two hours. The catalyst can be recycled several times without losing its photocatalytic activity.
(3) Photocatalysts of TiO_2 supported on activated carbon fibre were prepared by means of vacuum adsorption-hydrolysis method, using sucrose as a binder between TiO_2 and ACF. The composite Ag-TiO_2/ACF photodegradation-antibacterial material were prepared by dipping method with loading silver nanoparticle on TiO_2/ACF surface. Ag-TiO_2/ACF were characterized by BET, XRD, and SEM. The experiment carried out by using methylene blue as the pollutant object to evaluate the photocatalytic activity,using Escherichia coli as the target to investigate the antibacterial activity . The results indicate that the photodegradation yield of methylene blue in aqueous solution is beyond 97% under the UV-visible light irradiation for two hours. The Ag-TiO_2/ACF containing as low as 0.75wt% of silver exhibited strong antibacterial activity.
(1)采用TiO_2作催化剂,通过大量试验,选择比表面积大,吸附能力强的活性炭纤维做催化剂载体。以亚甲基蓝降解为目标污染物,通过优化负载方法和光催化氧化反应条件达到去除水中有机污染物的目的。
(2)以钛酸四丁酯为前驱物,活性炭纤维(ACF)为载体,蔗糖为胶粘剂,采用真空吸附水解的方法制得了TiO_2/ACF催化剂。采用BET、XRD、SEM等手段对其物理化学特性进行表征,以四氯乙烯光降解反应为探针反应考察了TiO_2/ACF催化剂的光催化降解性能。实验结果表明,采用真空吸附水解法可以将TiO_2很好地负载到活性炭纤维表面上。通过优化条件制备的TiO_2/ACF催化剂在光照2h条件下,可以将水中溶解量的四氯乙烯降解90%以上。催化剂可以多次循环使用,光催化反应活性不变。
(3)以钛酸四丁酯为前躯体,活性炭纤维(ACF)为载体,蔗醣为粘结剂,采用真空吸附水解法制备了TiO_2/ACF催化剂。采用浸渍法,在TiO_2/ACF表面负载上银纳米颗粒,制得Ag-TiO_2/ACF光降解-抗菌复合材料。利用BET、XRD、SEM等方法对催化剂进行了表征。研究了Ag-TiO_2/ACF在光照下对亚甲基蓝的降解作用和对大肠杆菌的杀灭效果。结果表明,Ag-TiO_2/ACF复合材料在光照2h下,可以将水中溶解量的亚甲基蓝降解97%以上。当Ag含量为0.75wt%时,Ag-TiO_2/ACF对大肠杆菌具有很强的灭杀作用。
In order to improve the photocatalytic activity and bactericidal properties, select the ACF to load titanium dioxide, and research the Preparation, modification and its properties of the Activated Carbon Fibre-Supported TiO_2 Catalyst:
(1) TiO_2 was used as catalyst in my experiment ,by many experiment ,we selected activated carbon fibre as carrier, because it had large specific surface area and good adsorption capacity. Using methylene. blue as target pollutant in aqueous solution to optimize TiO_2 material and reaction condition increased the photocatalytic oxidation efficiency.
(2) Photocatalysts of TiO_2 supported on activated carbon fibre were prepared by means of vacuum adsorption-hydrolysis method, using sucrose as a binder between TiO_2 and ACF. The TiO_2/ACF catalysts were characterized by BET, XRD, and SEM. The photodegradation activity of TiO_2/ACF was investigated with tetrachloroethylene (TCE) as a probe molecule. The results indicate that TiO_2 can be loaded on the surface of the ACF perfectly through the vacuum absorption-hydrolysis method. The photodegradation yield of TCE in aqueous solution is beyond 90% using the catalyst prepared in optimum method under the UV-visible light irradiation for two hours. The catalyst can be recycled several times without losing its photocatalytic activity.
(3) Photocatalysts of TiO_2 supported on activated carbon fibre were prepared by means of vacuum adsorption-hydrolysis method, using sucrose as a binder between TiO_2 and ACF. The composite Ag-TiO_2/ACF photodegradation-antibacterial material were prepared by dipping method with loading silver nanoparticle on TiO_2/ACF surface. Ag-TiO_2/ACF were characterized by BET, XRD, and SEM. The experiment carried out by using methylene blue as the pollutant object to evaluate the photocatalytic activity,using Escherichia coli as the target to investigate the antibacterial activity . The results indicate that the photodegradation yield of methylene blue in aqueous solution is beyond 97% under the UV-visible light irradiation for two hours. The Ag-TiO_2/ACF containing as low as 0.75wt% of silver exhibited strong antibacterial activity.
引文
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