Abstract: In order to develop visible light catalytic material with high utilization rate ofnatural light and photogenerated quantum，the Ag-black nano TiO₂-tourmaline（ABTT）was prepared by a three-step method of“sol-gel + vacuum induction + hydrogen reduction”using natural tourmaline powder，titanate，silver nitrate etc. as core raw materials. The photocatalytic properties，absorbance，microstructure，natural electric field properties and antibacterialperformance were characterized by photocatalytic degradation of methyl orange，absorbance spectra，scanning electron microscopy（SEM）， SEM electron beam bombardment and bacteriostatic zone method，respectively. The results showed that the disordered structure onmicroscopic and crystal nucleus surfaces gave ABTT the dark gray black appearance，while the black nano TiO₂ presented as multilayered particles with nanoconvex and abundant nanopores， which could provide more reaction sites for photocatalytic process. The electron beambombardment behavior of ABTT particles showed a bright and agglomerated phenomenon， which indicated that the natural electric field characteristics of tourmaline were well maintained in ABTT particles，and obvious redshift was obsrved in the UV-Vis spectrum. Thephotocatalytic degradation rate of methyl orange by ABTT reached 99. 2% in 120 min. Whenthe mass ratio of ABTT to ordinary interior wall coating was 0. 8∶100，the photocatalytic degradation rate of formaldehyde reached 88. 6% in 24 h，and the diameter of antibacterial circle of Staphylococcus aureus and Escherichia coli could reach 20. 3 mm and 22. 5 mm， respectively. Hence the ABTT had excellent photocatalytic performance and antibacterialperformance under natural lighting conditions，showing a very good application prospect in the field of environmental protection.

Key words: visible light photocatalysis, Ag-black nano TiO₂-tourmaline, interior wall coating, degradation rate of formaldehyde, antibacterial performance

摘要： 为研制具有高自然光利用率和高光生量子利用率的 Ag-黑纳米 TiO₂-电气石可见光催化材料（ ABTT）。采用“溶胶 -凝胶 +真空诱导 +氢还原”的三步法进行制备，核心原料包括天然电气石微粉、钛酸盐、硝酸银等。通过光催化降解甲基橙、吸光度测试、扫描电子显微镜（ SEM）、 SEM电子束轰击法、抑菌圈法等分别对其光催化性能、吸光度、微观结构、天然电场特性、抑菌性能等进行了表征。结果表明： ABTT微观表面和晶核表面的无序结构使其显现为深灰黑色，黑纳米 TiO₂呈现为多层状颗粒，表面具有纳米凸起，且存在丰富的纳米孔，该结构能够在光催化反应过程中提供更为丰富的光催化点位。 ABTT微粒的电子束轰击行为呈现出发亮且团聚的现象，这表明电气石的天然电场特性在ABTT微粒中得到了良好的保持，同时其紫外 -可见吸收光谱存在明显的红移。且 ABTT对甲基橙的120 min光催化降解率达到了 99. 2%，ABTT与普通内墙涂料质量比为 0. 8∶100时，对甲醛的 24 h光催化降解率为 88. 6%，对金黄色葡萄球菌及大肠杆菌的抑菌圈直径可达 20. 3 mm和 22. 5 mm。可见，Ag-黑纳米 TiO₂-电气石可见光催化材料在自然光照条件下具有优良的光催化性能和抑菌性能，在环保领域具备良好的应用前景。

关键词: 可见光催化, Ag-黑纳米 TiO₂-电气石, 内墙涂料, 甲醛降解率, 抗菌性

CLC Number: 

• TQ637