[111]-/{101}晶面共暴露的锐钛矿型TiO_(2)纳米晶的制备及可提高的光催化性能  

Synthesis of[111]-/{101}facets co-exposed anatase TiO_(2)nanocrystals with improved photocatalytic performance

作　　者：牛宪军 白杨 杜意恩 NIU Xian-Jun;BAI Yang;DU Yi-En(Department of Chemistry&Chemical Engineering,Jinzhong University,Jinzhong 030619,China)

机构地区：[1]晋中学院化学化工系,晋中030619

出　　处：《四川大学学报（自然科学版）》2023年第3期135-146,共12页Journal of Sichuan University(Natural Science Edition)

基　　金：山西省自然科学基金(201901D111303);山西省高等学校科技创新计划(2019L0881,2020L0612);晋中学院“1331工程”创新团队项目(jzxycxd2019005)。

摘　　要：本文以层状钛酸H_(1.07)Ti_(1.73)O_4为前驱体,以不同含量的HF溶液为形貌控制剂,在温和的水热条件下(120~180℃)采用一锅法合成了共暴露[111]-/{101}晶面的方块状为主的锐钛矿型TiO_(2)纳米晶;对制备的xHF-T180(x=0.5,1.0,1.5,2.0,2.5,3.0 mL)锐钛矿型TiO_(2)纳米晶的晶体结构、形貌、微观结构、比表面积、元素电子态、光学性能和电荷迁移行为进行了表征;并对其光催化降解MB性能进行了评价.研究结果表明,与CM-TiO_(2)和其他xHFT180锐钛矿型TiO_(2)纳米晶相比,2.5HF-T180显示了最高的k值(0.0165 min^(-1)),分别是Blank(0.0009 min^(-1))、CM-TiO_(2)(0.0083 min^(-1))、0.5HF-T180(0.0126 min^(-1))、1.0HFT180(0.0113 min^(-1))、1.5HF-T180(0.0142 min^(-1))、2.0HF-T180(0.0130 min^(-1))和3.0HFT180(0.0123 min^(-1))样品的18.33、1.99、1.31、1.46、1.16、1.27和1.34倍.2.5HF-T180显示了最高的光催化活性可以归因于其最小的颗粒尺寸、最大的比表面积、最弱的荧光光谱强度和最小的电阻的协同效应.本研究为合成具有较高光催化性能的锐钛矿型TiO_(2)纳米晶以处理有机染料废水提供了新思路.Cuboid anatase TiO_(2)nanocrystals with co-exposed[111]-/{101}facets were synthesized by one-pot method under mild hydrothermal conditions(120~180?C)using layered titanate H1.07Ti1.73O4 as precursor and different amounts of HF as morphology-controlling agent.The crystal structure,morphology,microstructure,surface area,electronic states,optical properties and charge migration behavior of xHF-T180(x=0.5,1.0,1.5,2.0,2.5,3.0 mL)anatase TiO_(2)nanocrystals were characterized,and their photocatalytic degradation of MB was evaluated.The results show that,compared with CM-TiO_(2)and other xHF-T180 anatase TiO_(2)nanocrystals,2.5HF-T180 shows the highest k value(0.0165 min^(-1)),which is 18.33,1.99,1.31,1.46,1.16,1.27 and 1.34 times that of Blank(0.0009 min^(-1)),CM-TiO_(2)(0.0083 min^(-1)),0.5HF-T180(0.0126 min^(-1)),1.0HF-T180(0.0113 min^(-1)),1.5HF-T180(0.0142 min^(-1)),2.0HF-T180(0.0130 min^(-1)),and 3.0HF-T180(0.0123 min^(-1)),respectively.The highest photocatalytic activity of 2.5HF-T180 can be attributed to the synergistic effect of its smallest particle size,largest specific surface area,weakest fluorescent intensity and smallest electrical resistance.This study provides a new idea for the synthesis of anatase-type TiO_(2)nanocrystals with high photocatalytic performance for the treatment of organic dye wastewater.

关 键 词：锐钛矿型TiO_(2) 晶面暴露 水热法 光催化性能 形貌控制剂 

分 类 号：O643[理学—物理化学]