Abdelraouf Hussein, Zhou Fanyang, Li Yulong, Ren Jiayi, Zhao Guanshu, Zhao Qingliang, Wei Jian, Zhai Xuedong, Ding Jing
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Civil Engineering Department, Benha Faculty of Engineering, Benha University, Benha, Egypt.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Environ Res. 2023 Dec 15;239(Pt 1):117339. doi: 10.1016/j.envres.2023.117339. Epub 2023 Oct 11.
The easily synthesized, cost-effective, and stable photocatalysts for sulfite activation are always required for the enhancement of organic contaminants degradation. Herein, the facile coprecipitation synthesis of Bismuth oxybromide (BiOBr)/Montmorillonite (MMT) was reported, which could activate sulfite (SO/HSO) under sunlight and accelerate the catalytic performance more effectively than pristine BiOBr. After adding sulfite to the photocatalysis system, the photodegradation efficiency of atrazine (ATZ) achieved 73.7% ± 1.5% after 5 min and 94.4% ± 1.6% after 30 min of sunlight irradiation with BiOBr/MMT. The BiOBr/MMT-sulfite system also presented remarkable photocatalytic performance to eliminate various contaminants, including ciprofloxacin, sulfadiazine, tetracycline, and carbamazepine. The various features of the photocatalyst materials were studied, including their surface morphology, structure, optical properties, and composition. The results illustrated that by adding MMT, the bandgap of the pristine BiOBr was reduced and the surface area was increased, which led to an increased ability to adsorb materials. Results of various influence factors showed this enhanced system had satisfactory and stable removal performance of ATZ in the pH range of 3.0-6.5, but HPO had a strong negative effect on the system performance. Oxysulfur radicals (SO and SO), h, and O were discovered as the prevailing active species in the BiOBr/MMT-sulfite system. The proposed degradation mechanism of this photocatalyst-enhanced system revealed that sulfite adsorption on the surface of the photocatalyst played a vital role during the initial phase, and the degradation pathway of ATZ was discussed. This study provides a new synthesis strategy of a photocatalyst for sulfite activation and expands the potential uses of Bi-based photocatalysts in degrading difficult-to-remove organic pollutants.
为了增强有机污染物的降解效果，一直需要易于合成、成本效益高且稳定的用于亚硫酸盐活化的光催化剂。在此，报道了通过简便的共沉淀法合成溴氧化铋（BiOBr）/蒙脱石（MMT），其能够在阳光下活化亚硫酸盐（SO/HSO），并且比原始的BiOBr更有效地加速催化性能。在光催化体系中加入亚硫酸盐后，使用BiOBr/MMT在阳光照射5分钟后，阿特拉津（ATZ）的光降解效率达到73.7%±1.5%，照射30分钟后达到94.4%±1.6%。BiOBr/MMT-亚硫酸盐体系在消除各种污染物（包括环丙沙星、磺胺嘧啶、四环素和卡马西平）方面也表现出显著的光催化性能。研究了光催化剂材料的各种特性，包括其表面形态、结构、光学性质和组成。结果表明，通过加入MMT，原始BiOBr的带隙减小，表面积增加，从而导致吸附材料的能力增强。各种影响因素的结果表明，该增强体系在pH值为3.0 - 6.5的范围内对ATZ具有令人满意且稳定的去除性能，但HPO对体系性能有强烈的负面影响。发现氧硫自由基（SO和SO）、h和O是BiOBr/MMT-亚硫酸盐体系中的主要活性物种。所提出的这种光催化剂增强体系的降解机制表明，亚硫酸盐在光催化剂表面的吸附在初始阶段起着至关重要的作用，并讨论了ATZ的降解途径。本研究提供了一种用于亚硫酸盐活化的光催化剂的新合成策略，并扩展了铋基光催化剂在降解难去除有机污染物方面的潜在用途。
