3D打印多孔TiO2光催化降解筛及光催化性能

摘要/Abstract

摘要： 开发了一种使用直写成型(DIW) 3D打印方法制备多孔TiO₂光催化降解筛的成型技术,厘清了打印浆料中P25粉末、TiO₂前驱体溶胶和聚乙烯醇(PVA)含量对其成型性能的影响规律;进一步研究了降解筛的物相组成、微观形貌、能带结构和载流子寿命,并在模拟自然光下测定了其对盐酸四环素(TC)的光催化降解性能和循环稳定性.结果表明:TiO₂前驱体溶胶起到了分散P25颗粒和稳定浆料的作用,而PVA的加入则进一步改善了浆料的流变性能.当使用9 g P25粉末与10 mL TiO₂前驱体溶胶和1 mL质量分数为7%的PVA溶液混合时,得到了具有最佳成型性能的打印浆料,制备的降解筛结构完整,无塌陷和开裂.热处理后TiO₂前驱体溶胶转化而来的小粒径TiO₂填充在P25颗粒之间,起到了增强机械强度的作用,而PVA作为造孔剂极大地丰富了降解筛的孔隙结构.TiO₂光催化降解筛对TC表现出优异的光催化性能和循环稳定性,140 min内的降解率为98.4%,并在5次循环之后保持96.0%的降解率.

关键词: 3D打印, 光催化, TiO₂, 盐酸四环素

Abstract: A technique for fabricating a porous TiO₂ photocatalytic degradation screen using direct ink writing (DIW) 3D printing method had been developed. The influence of P25 powder, TiO₂ precursor sol and polyvinyl alcohol (PVA) content on the molding performance of the printing slurry had been clarified. Further studies were conducted on the phase composition, microscopic morphology, band structure, and carrier lifetime of the degradation screen, and its photocatalytic degradation performance and cyclic stability under simulated natural light for tetracycline hydrochloride (TC) were determined. The results showed that the TiO₂ precursor sol can disperse P25 particles and stabilize the slurry, while the addition of PVA further improves the rheological properties of the slurry. When 9 g of P25 powder is mixed with 10 mL of TiO₂ precursor slurry and 1 mL of 7% PVA solution, the printing slurry with the best molding performance is obtained. The degradable screen structure made by the prepared material is intact, without collapse and crack. After thermal treatment, the TiO₂ precursor dispersion is converted into small-sized TiO₂ particles, which fill the voids between P25 particles and enhance the mechanical strength. Meanwhile, PVA serves as a pore former to greatly enrich the pore structure of the degradable screen. TiO₂ photocatalytic degradation screen exhibits excellent photocatalytic performance and cyclic stability towards TC, with a degradation rate of 98.4% within 140 minutes and a degradation rate of 96.0% after five cycles.

Key words: 3D printing, photocatalysis, TiO₂, tetracycline hydrochloride

中图分类号:

TB34

李翠霞, 袁博, 王安航, 张鑫. 3D打印多孔TiO₂光催化降解筛及光催化性能[J]. 兰州理工大学学报, 2025, 51(3): 15-23.

LI Cui-xia, YUAN Bo, WANG An-hang, ZHANG Xin. 3D printed porous TiO₂ photocatalytic degradation sieve and photocatalytic performance[J]. Journal of Lanzhou University of Technology, 2025, 51(3): 15-23.

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3D打印多孔TiO₂光催化降解筛及光催化性能

3D printed porous TiO₂ photocatalytic degradation sieve and photocatalytic performance

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