Ball-milled bismuth oxychloride/biochar nanocomposites with rich oxygen vacancies for reactive red-120 adsorption in aqueous solution

作者：Luo, Yidan; Wang, Yonghu; Zhu, Yaowei; Xue, Mingshan^*; Zheng, Aofeng; Han, Yu; Yin, Zuozhu; Hong, Zhen; Xie, Chan; Li, Xibao; Lei, Sheng; Gao, Bin

来源：BIOCHAR, 2022, 4(1): 21.

DOI：10.1007/s42773-022-00147-0

• Bismuth oxychloride
• Biochar
• Reactive red-120
• Aqueous media
• Oxygen vacancies
• Adsorption mechanisms

Fabricating surface oxygen vacancies is considered to be an efficient method to improve the adsorption performance of sorbents. In this work, a bismuth oxychloride/biochar (BiOCl/BC) nanocomposite with abundant oxygen vacancies was successfully prepared by a facile ball milling method. BiOCl/BC nanocomposite was found to have excellent adsorption performance for removing reactive red-120 (RR120) from aqueous solution. The effects of key adsorption parameters, such as RR120 dye concentration, solution pH (2-10), and contact time were studied by batch adsorption test. The adsorption data were well described by the Langmuir and Freundlich isotherms and pseudo-second-order kinetic models. The 50%-BiOCl/BC (50 wt% of BiOCl in composite) exhibited the best adsorptive performance (60%), much better than the pristine BM-BC (20%). The high adsorption capacity of 50%-BiOCl/BC (Langmuir maximum capacity of 116.382 mg g(-1)) can be attributed to the electrostatic effect, pi-pi interactions, and hydrogen bond. This work provided a facile method to prepare semiconductor assisted biochar-based adsorbents, which would also contribute to the advance of environmental remediation. @@@ [GRAPHICS] @@@ .

• 单位
  江苏大学; 南昌航空大学