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

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