CAJ | 학술논문

为了提高空心TiO2的光催化活性和拓展其对可见光的响应,以聚苯乙烯为模板合成 TiO2空心微球,再通过KBH4还原AgNO3,制备了 TiO2空心壳层表面载有 Ag 单质粒子的复合微球.利用 SEM、TEM、XRD和EDS对 Ag-TiO2空心微球的形貌结构和组成进行表征,并以有机染料罗丹明 B(RhB)为目标降解物,研究该复合微球的光催化性能.在紫外光下,载银量为2％的 Ag-TiO2复合微球2 h 内对 RhB的降解率比同条件下空心TiO2提高23．8％；在可见光下,载银量为2％的Ag-TiO2复合微球在6h 内对 RhB的降解率比同条件下空心 TiO2提高28．2％.结果表明,壳层表面载有适量 Ag 单质粒子的空心 TiO2复合微球,其光催化活性和对可见光的响应显著高于纯空心TiO2微球.
위료제고공심TiO2적광최화활성화탁전기대가견광적향응,이취분을희위모판합성 TiO2공심미구,재통과KBH4환원AgNO3,제비료 TiO2공심각층표면재유 Ag 단질입자적복합미구.이용 SEM、TEM、XRD화EDS대 Ag-TiO2공심미구적형모결구화조성진행표정,병이유궤염료라단명 B(RhB)위목표강해물,연구해복합미구적광최화성능.재자외광하,재은량위2％적 Ag-TiO2복합미구2 h 내대 RhB적강해솔비동조건하공심TiO2제고23．8％；재가견광하,재은량위2％적Ag-TiO2복합미구재6h 내대 RhB적강해솔비동조건하공심 TiO2제고28．2％.결과표명,각층표면재유괄량 Ag 단질입자적공심 TiO2복합미구,기광최화활성화대가견광적향응현저고우순공심TiO2미구.
In order to improve the photo catalytic activity of TiO2 and expend its response to visible light,a com-posite sphere (Ag-TiO2 )that contained Ag particles on the surface of TiO2 hollow shell was prepared through the redox reaction of AgNO3 with KBH4 using the surface treated polystyrene particles as templates.The com-posite,morphology and crystal structure of obtained Ag-TiO2 hollow spheres were characterized by SEM, TEM,XRD and EDS.The photo catalytic performance of Ag-TiO2 for Rhodamine B (RhB)degradation was in-vestigated under UV-Vis light irradiation.Under UV light irradiation,RhB degradation rate was increased by a-bout 23.8% within 2 h when Ag-TiO2 composite with molar ratio n(Ag)/n(Ti)of 2% were used compared with TiO2 hollow particles.Under visible light irradiation,RhB degradation rate was increased by about 28.2%within 6 h for Ag-TiO2 composite with molar ratio n(Ag)/n(Ti)of 2% compared with TiO2 hollow particles. Results show that TiO2 hollow shell containing an appropriate Ag particle can significantly improve the photo catalytic activity and expend TiO2 response to visible light.