Abstract
Lignin biochar was acid washed and then treated with ultrasound at different time durations to improve its sorption of CO2. Raman, XRD, FTIR spectrum and thermostability test confirmed that this post-treatment method cleaned the surface of the pristine biochar and enlarged its porosity by opening pores blocked by ash and organic components. As a result, specific surface areas and micropore volumes of post-treated biochars increased 7.3–8.6 and 8.2–8.8 times, respectively, while their ash contents decreased from 76.31% to 6.12%-13.63%. More importantly, CO2 uptake of the post-treated biochar reached 178.75 mg/g, which could be ascribed to developed micropore structure. Adsorption kinetic and isotherm analyses showed that CO2 was adsorbed onto the post-treated biochar mainly through multilayer physical adsorption. The high adsorption capacity, terrific reusability (99.46% after 10 cycles) and excellent selectivity of the post-treated biochar suggest that acid washing assisted with ultrasonic treatment is a promising modification technique for biochar, promoting its engineering application in CO2 capture.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
