镧掺杂纳米二氧化钛透明光触媒乳液的制备及光催化性能

Preparation and Photocatalytic Properties of Transparent La-Doped Titanium Dioxide Photocatalyst Emulsion

以四氯化钛、草酸、氨水、硝酸镧、D-山梨醇等为主要的实验药品,采用了常温络合—控制水解法,制备出平均粒径6.9 nm的镧掺杂纳米二氧化钛透明光触媒乳液。在太阳光照射下利用该透明乳液对酸性红3R染料降解,并研究了染料初始浓度、样品加入量、体系pH值、加热回流时间对降解效果的影响。采用XRD、纳米激光粒度分析仪、紫外—可见分光光度计等对样品的物相、粒径、组成、光吸收、光催化等性质进行了表征。结果表明,当镧掺杂量为0.1%、体系pH值为6、回流时间为10 min时,镧掺杂纳米二氧化钛光催化性能最好.太阳光照射60 min后,对浓度为25 mg/L的酸性红3R染料溶液的降解率达到98%以上。

La-doped nano TiO2 colorless and transparent hydrosol with an average particle size of 6.9 nm was synthesized by a novel complexation-controlled hydrolysis method at room temperature by using TICl4, organic carboxylic acid, stabilizer, surfactant, NH3.H20, La（NO3）3-6H2O, and D-sorbitol etc as raw materials And the acid red 3R was studied by the photocatalytic degradation. To study the effects of reflux time, pH and concentration and reaction conditions of the synthesis process and properties of the materials, the optimumpreparation conditions were found out. The samples were characterized by X-ray diffraction （XRD）, UV-visible spectroscopy （UV-Vis）, and nano particle size analyzer. The La-doped nano-TiO2 transparent photocatalyst exhibits optimal photocatalytic performance when the 10 min, respectively. The degradation efficiency of acid reached 98% after being exposed to sunlight for 60 min doping content was 0.1% and the refluxing time was red 3R dye solution with concentration 25 mg/L has