中空TiO_2微球的制备及其对聚丙烯酸酯薄膜保温性能的影响

以阳离子PS微球为模板,钛酸四丁酯为钛源,氨水为催化剂制备中空TiO_2微球,通过物理共混法将中空TiO_2微球引入到聚丙烯酸酯薄膜中,考察了中空TiO_2微球的空心粒径及用量对复合薄膜光反射性、导热系数及力学性能的影响。结果表明:中空TiO_2微球的引入可显著提升聚丙烯酸酯薄膜的各项性能,中空TiO_2微球的空心粒径和用量对复合薄膜的性能有不同程度的影响,随着中空TiO_2微球空心粒径和用量的增加,复合薄膜的性能基本呈现先提升后降低的趋势,其中当中空TiO_2微球空心粒径为300 nm、用量为1%时,所制备的复合薄膜保温性能和力学性能最优。

TiO_2中空微球的制备及其对罗丹明B的光催化降解

采用一步水热法,以TiCl_4,H_2O_2,KBF4为原料,制备了TiO_2中空微球。采用SEM和XRD技术对TiO_2中空微球的形貌和结构进行了表征。以罗丹明B为模拟降解物,研究了TiO_2中空微球的光催化降解活性;并对TiO_2中空微球的生长机制进行了探讨。表征结果显示,制得的TiO_2中空微球呈锐钛矿型,颗粒分散均匀,外径约为3μm。实验结果表明,在紫外光照射下,加入1 g/L的TiO_2中空微球,处理初始质量浓度为20 mg/L、溶液p H为7的罗丹明B溶液,降解时间为120 min时,罗丹明B降解率可达93.38%。

Simultaneous formation of a C/N-TiO_2 hollow photocatalyst with efficient photocatalytic performance and recyclability

Herein,we report a unique approach towards the preparation of C-modified and N-doped TiO2 hollow spheres(C/N-TiO2).TEM,SEM,and XPS analyses were used to confirm that the carbon and nitrogen co-decorated TiO2 photocatalyst was formed.Carbon-decoration improves the visible-light absorption and speeds up the separation of the photo-generated electron-hole pairs.C/N-TiO2 not only narrows the band gap of TiO2,but also exhibits excellent photocatalytic activity for the degradation of tetracycline and tetracycline hydrochloride.In addition,the C/N-TiO2 photocatalyst shows excellent recyclability for water decontamination,making it a promising candidate to purify aquatic contaminants.