以十八胺为成孔剂制备TiO2薄膜的性能

以十八胺作为成孔剂,采用溶胶-凝胶法制备了多孔TiO2薄膜,研究了薄膜的性能和光催化降解甲基橙的活性。所制备的材料为锐钛矿TiO2薄膜,其晶粒尺寸随ODA添加量的增加而变大。随ODA添加量的增加,薄膜表面出现多孔结构,薄膜的透射率下降,且吸收边界向长波方向偏移。ODA添加量为2.0g时,薄膜具有最佳光催化活性。当光催化反应时间为240 min时,薄膜对甲基橙的降解率达到96.2%。经过多次重复使用,薄膜仍有较高的光催化活性。     

TiO_2薄膜的亲水性及光催化自清洁效果

以溶胶-凝胶法为基础,在普通玻璃表面制备了具有纳米尺寸气孔、纳米及微米尺寸复合气孔结构的TiO2薄膜或TiO2/SiO2复合薄膜,并考察了它们的亲水性能及表面经空气中灰尘污染后,其超亲水性能在紫外光照射下的恢复能力。所有纯TiO2薄膜于制备后测试的表面水接触角均达到0°。SiO2的掺杂量较小（10%）时,SiO2的掺入增大了薄膜的水接触角,但随着SiO2掺杂量的增大,接触角减小,可达到超亲水效果。表面污染的薄膜经紫外光照射后,其超亲水性的光致恢复能力基本不受前驱体溶胶的陈化时间、SiO2掺杂浓度、表面形态的影响,但与薄膜的光催化活性有关。4层以上的薄膜或带有SiO2中间隔离层的薄膜由于可以抑制玻璃基底中Na＋扩散至薄膜表面,光催化降解灰尘污染物的能力较高,紫外光照射后均能恢复其超亲水性能。     

金红石型TiO2/锐钛矿型TiO2/SiO2三元复合薄膜的合成

采用水热法,以钛酸正丁醑为初始原料,在FTO基底上沉积了金红石型TiO2纳米棒阵列,然后利用锐钛矿型TiO2纳米粒子及无定形SiO2对纳米棒进行了表面修饰,获得金红石型TiO2/锐钛矿型TiO2/SiO2三元复合薄膜.扫描电镜及X射线衍射分析结果表明,在FTO表面上沉积的TiO2为金红石型单晶纳米棒,其尺寸随反应时间的增加而增大.电化学测试结果表明,随着纳米棒尺寸的增大,相应复合薄膜的电化学反应电荷转移阻力增大.2种TiO2晶型混合引起的电子-空穴分离效应及混合的均匀程度直接影响到复合薄膜的光催化活性.水热反应7h得到的纳米棒阵列相应的复合薄膜显示了较好的电化学性能及光催化活性.     

TiO2/SiO2薄膜的制备及光催化降解氯前水的TOC

TiO2光催化降解有机污染物存在反应后催化剂难于分离、颗粒不适宜循环使用和易失活等缺点，在实际应用中受到一定限制，而以SiO2为基底的负载型薄膜能较好地解决上述问题．采用溶胶一凝胶法制备TiO2／SiO2复合薄膜，在光催化作用下，将不同温度下制备的薄膜对自来水厂氯前水的TOC进行降解实验．结果表明，热处理温度在450℃时制备的TiO2／SiO2复合薄膜降解效果最好，该薄膜能生成大量的有利于光生空穴和电子分离的表面层，减小了电子一空穴在TiO2表面的复合几率，使薄膜的光催化效率大大提高，氯前水的TOC值有较大幅度的降低．     

Mn~(2+)掺杂对纳米TiO_2薄膜光催化活性的影响

采用溶胶-凝胶法制备Mn2+掺杂的TiO2薄膜光催化剂,进行甲醛的光催化实验,考察Mn2+掺杂量、薄膜焙烧温度、溶胶体系pH值及薄膜厚度对光催化性能的影响.结果表明,Mn2+掺杂量为1.0%,焙烧温度500℃1 h,加硝酸溶胶体系pH=4,镀膜5层时,Mn2+掺杂TiO2薄膜光催化活性最高.150 min后甲醛降解率达79%,是单纯TiO2薄膜的1.4倍.     

TiO2-SiO2复合粒子的制备与表征

采用溶胶-凝胶技术通过水解法在SiO2表面包覆纳米TiO2,制备出TiO2-SiO2复合粒子.借助于傅立叶红外光谱、扫描电镜、透射电镜对其进行了表征,结果表明TiO2成功地包覆在SiO2的表面.通过采用X射线衍射定量分析方法来测量复合粒子中锐钛矿型二氧化钛的质量分数,得出当pH=2、SiO2与TiO2摩尔比10∶90、煅烧温度750 ℃为最佳制备条件;通过复合粒子和二氧化钛粒子分别对甲基橙溶液进行光催化降解的比较表明,复合粒子光催化效果比较好.     

TiO_2-SiO_2复合粒子的制备与表征

采用溶胶-凝胶技术通过水解法在SiO2表面包覆纳米TiO2,制备出TiO2-SiO2复合粒子。借助于傅立叶红外光谱、扫描电镜、透射电镜对其进行了表征,结果表明TiO2成功地包覆在SiO2的表面。通过采用X射线衍射定量分析方法来测量复合粒子中锐钛矿型二氧化钛的质量分数,得出当pH=2、SiO2与TiO2摩尔比10∶90、煅烧温度750℃为最佳制备条件;通过复合粒子和二氧化钛粒子分别对甲基橙溶液进行光催化降解的比较表明,复合粒子光催化效果比较好。     

XPS技术分析离子扩散对TiO2薄膜光催化活性的影响

采用溶胶-凝胶浸渍提拉法在不同玻璃基板上制备TiO2薄膜,通过降解浸渍在薄膜表面的甲基蓝来评价其光催化活性．利用X射线光电子能谱分析TiO2薄膜表面元素,采用平行电极法测定TiO2薄膜的光电流,研究薄膜表面离子扩散情况。结果表明,在相同条件下,光催化活性以石英玻璃为基板的TiO2薄膜较高,而以普通玻璃为基板的TiO2薄膜较低．这是由于在煅烧过程中以普通玻璃为基板的TiO2薄膜,其Na^＋扩散到表面成为电子和空穴的复合中心,降低量子效率所致．     

金红石型TiO_2/锐钛矿型TiO_2/SiO_2三元复合薄膜的合成

采用水热法,以钛酸正丁酯为初始原料,在FTO基底上沉积了金红石型TiO2纳米棒阵列,然后利用锐钛矿型TiO2纳米粒子及无定形SiO2对纳米棒进行了表面修饰,获得金红石型TiO2/锐钛矿型TiO2/SiO2三元复合薄膜。扫描电镜及X射线衍射分析结果表明,在FTO表面上沉积的TiO2为金红石型单晶纳米棒,其尺寸随反应时间的增加而增大。电化学测试结果表明,随着纳米棒尺寸的增大,相应复合薄膜的电化学反应电荷转移阻力增大。2种TiO2晶型混合引起的电子-空穴分离效应及混合的均匀程度直接影响到复合薄膜的光催化活性。水热反应7h得到的纳米棒阵列相应的复合薄膜显示了较好的电化学性能及光催化活性。     

掺Ag纳米TiO2薄膜的制备与光催化性能研究

利用钛酸四丁酯水解得到TiO2胶体溶液,加AgNO3得到掺Ag的TiO2胶体溶液;在室温下利用浸渍-提拉法制成透明的前驱体薄膜,通过煅烧处理得到掺Ag的TiO2薄膜,并在此基础上进行了光催化降解甲基橙的试验．结果表明：利用溶胶-凝胶法可制得TiO2薄膜,在钛酸四丁酯的乙醇溶液物质的量浓度为0．840mol／L、TiO2和Ag物质的量比为10：1条件下,掺Ag薄膜中TiO2颗粒的平均粒径大约为几十纳米,且分布较为均匀;煅烧温度显著影响TiO2(Ag)薄膜的光催化性能,煅烧温度为350℃时TiO2薄膜光催化能力最好;掺入Ag可以提高TiO2薄膜的光催化降解能力,本试验条件下TiO2和Ag物质的量比为10：1的TiO2(Ag)薄膜催化能力最强．     

Preparation of TiO_2 Thin Film and Its Antibacterial Activity

1　IntroductionInrecentyears ,theuseofinorganicantimicrobialagentshasattractedinterestforthecontrolofmicrobes[1-3 ] .Thekeyadvantagesofinorganicantimicro bialagentsareimprovedsafetyandstability ,ascomparedwithorganicantimicrobialagents .Atpresent,mostanti…     

Preparation and Properties of Ag-TiO_2 Thin Films on Glass Substrates

1　ＩｎｔｒｏｄｕｃｔｉｏｎＩｎ 1970ｓ ,ｔｈｅｐｈｏｔｏｃａｔａｌｙｔｉｃｐｒｏｐｅｒｔｙｏｆｔｉｔａｎｉｕｍｄｉｏｘｉｄｅ (ＴｉＯ2 )ｗａｓｆｏｕｎｄｂｙＦｕｊｉｓｈｉｍａｅｔａｌ[1] .ＴｉＯ2 ｉｓｗｈｉｔｅｉｎｃｏｌｏｒ,ｉｎｅｘｐｅｎｓｉｖｅ ,ａｎｄｎｏｎｔｏｘｉｃ .Ｂｅｃａｕｓｅｏｆｉｔｓｓｔｒｏｎｇｐｈｏｔｏｃａｔａｌｙｔｉｃｅｆｆｅｃｔ ,ＴｉＯ2 ｉｓｕｓｅｄｉｎｔｈｅｔｒｅａｔｍｅｎｔｏｆｗａｓｔｅｗａｔｅｒａｎｄｔｈｅｐｕｒｉｆｉｃａｔｉｏｎｏｆａｉｒａｓａｎａｎｔｉｂａｃｔｅｒｉａ…     

The Effect of SiO_2 Additive on Super-hydrophilic Property of TiO_2-SiO_2 Thin Film by Sol-gel Method

TiO2-SiO2 thin films have been prepared on slide glass substrates by sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle of water, the microstructure, the transmittance, the photocatalytic activity and the specific surface area . The results showed that 10mol% of SiO2 additive was the most effective for decreasing contact angle of water. The SiO2 additive of less than 30mol% has a suppressive effect on the crystal growth of anatase in calcinations, resulting in a large surface area. Consequently, the super-hydrophilicity was improved.     

STUDY ON PHOTOCATALYTIC MECHANISM OF SOL-GEL-DERIVED Pb-DOPED TiO_2 THIN FILMS

Pb-doped TiO2 photocatalytic thin films were prepared on a soda-lime glass substrate via sol-gel method using TiO2 sol solution containing lead and characterized by X-ray photoelectron spectroscopy (XPS). The results showed that besides oxides of Ti(IV) there is a certain amount of oxides of To(Ⅲ) and Ti(Ⅱ) and Pb exists in the forms of PbTiO3 and PbO. The photocatalytic activity of the Pb-doped TiO2 films was evaluated by the photocatalytic decolorization of aqueous methyl orange and photocatalytic mechanism mas also analyzed.     

Preparation and photocatalytic activity of Cu^2＋-doped TiO2/SiO2

Cu2+-doped nanostructured TiO2-coated SiO2. (TiO2./SiO2) particles were prepared by the layer-by-layer assembly technique and their photocatalytic property was studied. TiO2 colloids were synthesized by the sol-gel method using TiOSO4 as a precursor. The experimental results showed that TiO2 nanopowders on the surface of SiO2 particles were well distributed and compact. The amount of TiO2 increased with the increase in coating layers. The shell structure appeared to be composed of anatase titania nanocrystals at 550℃. The 2-layer coated TiO2 particles on the surface showed a higher degradation rate compared with all the dif-ferent-layer samples. The photocatalytic activity of Cu2+-doped TiO2/SiO2 was higher than that of undoped TiO2/SiO2. The optimum dopant content was about 0.10wt%.     

Self-cleaning glass coated with Fe~(3 )-TiO_2 thin film

1　INTRODUCTIONTheinfluenceofvariouschemicalsontheenvi ronmentisoneofthemostimportantsocialproblems .Therearemanywaystoabatethepollutionfromthechemicals .Oneofthemostpromisingtechniquesistooxidesuchchemicalsbyphotocatalysis .SinceFranketalreportedthepossibilityofusingTiO2 todecom posecyanideinwaterin 1977[1] ,therehasalsobeenincreasinginterestinenvironmentalapplicationsoftheoxide[2 4 ] .Althoughthemechanismoftitaniumdioxidephotocatalysishasbeenclarified ,therehavebeenfewsuccessfulindustr…     

The Effect of SiO2 Additive on Super-hydrophilic Property of TiO2-SiO2

TiO2-SiO2 thin films have been prepared on slide glass substratesby sol-gel method, and the effect of SiO2 additive on photo-generated hydrophilicity of TiO2 thin film was investigated by measuring the contact angle of water, the microstructure, the transmittance, the photocatalytic activity and the specific surface area. The results showed that 10mol% of SiO2 additive was the most effective for decreasing contact angle of water. The SiO2 additive of less than 30mol% has a suppressive effect on the crystal growth of anatase in calcinations, resulting in a large surface area. Consequently, the super-hydrophilicity was improved.