Preparation and formation mechanism of BiOCl_0.75I_0.25 nanospheres by precipitation method in alcohol-water mixed solvents

详细信息    查看全文

• 作者：Xiaoning Wang^a ; ^b ; ^c ; Hongche Chen^a ; Hongjing Li^a ; ^{lihongjing@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Gilles Mailhot^b ; ^c ; Wenbo Dong^a ; ^{wbdong@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：BiOCl0.75I0.25 ; Precipitation method ; Polyol ; Hierarchical nanospheres ; Photocatalytic degradation
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 September 2016
• 年：2016
• 卷：478
• 期：Complete
• 页码：1-10
• 全文大小：2747 K

文摘

BiOCl_0.75I_0.25 crystals with irregular three-dimensional (3D) flower-like and hierarchical nanosphere-like structures were successfully synthesized in different alcohol–water mixed solvents by precipitation method. The primary formation mechanism of BiOCl_0.75I_0.25 nanospheres was investigated by taking water, monohydric alcohols (ethanol and isopropanol), and polyhydric alcohols (ethylene glycol, diethylene glycol, and glycerol) as solvents in the synthesis process. The obtained BiOCl_0.75I_0.25 samples were characterized by powder X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy, and nitrogen adsorption. Results showed that the alcohol solvents with different physical and chemical properties used in the synthesis process performed significant functions in directing the morphology and surface pore structure of BiOCl_0.75I_0.25 crystals. Meanwhile, BiOCl_0.75I_0.25 synthesized in various solvents exhibited morphology-dependent adsorption and photocatalytic degradation abilities in removing p-hydroxyphenylacetic acid (p-HPA), which was used as a model pollutant, in aqueous solutions under simulated solar light (λ ⩾ 290 nm). In addition, the fabrication process of the crystal products was proposed through a series of time-dependent experiments.