牛憲軍 白楊 杜意恩



本文以層狀鈦酸H1.07Ti1.73O4為前驅體,以不同含量的HF溶液為形貌控制劑,在溫和的水熱條件下(120~180 ℃)采用一鍋法合成了共暴露[111]-/{101}晶面的方塊狀為主的銳鈦礦型TiO2納米晶;對制備的xHF-T180 (x = 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 mL)銳鈦礦型TiO2納米晶的晶體結構、形貌、微觀結構、比表面積、元素電子態、光學性能和電荷遷移行為進行了表征;并對其光催化降解MB性能進行了評價. 研究結果表明,與CM-TiO2和其他xHF-T180銳鈦礦型TiO2納米晶相比,2.5HF-T180顯示了最高的k值(0.0165 min-1),分別是Blank (0.0009 min-1)、CM-TiO2 (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)和3.0HF-T180 (0.0123 min-1)樣品的18.33、1.99、1.31、1.46、1.16、1.27和1.34倍. 2.5HF-T180顯示了最高的光催化活性可以歸因于其最小的顆粒尺寸、最大的比表面積、最弱的熒光光譜強度和最小的電阻的協同效應. 本研究為合成具有較高光催化性能的銳鈦礦型TiO2納米晶以處理有機染料廢水提供了新思路.
銳鈦礦型TiO2; 晶面暴露; 水熱法; 光催化性能; 形貌控制劑
O643A2023.035002
收稿日期: 2022-11-30
基金項目: 山西省自然科學基金(201901D111303); 山西省高等學校科技創新計劃(2019L0881, 2020L0612); 晉中學院“1331工程”創新團隊項目(jzxycxd2019005)
作者簡介: 牛憲軍(1984-), 男, 山東鄒城人, 博士, 副教授, 主要研究方向為多相催化. E-mail: xjniu1984@163.com
通訊作者: 杜意恩. E-mail: duyien124@163.com
Synthesis of [111]-/{101} facets co-exposed anatase TiO2 nanocrystals with improved photocatalytic performance
NIU Xian-Jun, BAI Yang, DU Yi-En
(Department of Chemistry & Chemical Engineering, Jinzhong University, Jinzhong 030619, China)
Cuboid anatase TiO2 nanocrystals with co-exposed [111]-/{101} facets were synthesized by one-pot method under mild hydrothermal conditions (120~180 ℃) 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 TiO2 nanocrystals were characterized, and their photocatalytic degradation for MB was evaluated. The results show that, compared with CM-TiO2 and other xHF-T180 anatase TiO2 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-TiO2 (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 TiO2 nanocrystals with high photocatalytic performance for the treatment of organic dye wastewater.
Anatase-type TiO2; Exposed facets; Hydrothermal synthesis method; Photocatalytic performance; Morphology-controlling agent
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