热解条件对生物炭吸附重金属镉和铅的影响OA

[Objective]To prepare biomass-based activated carbon from sludge and garden waste and evaluate its potential application in the remediation of cadmium(Cd)and lead(Pb)contaminated soils.[Method]Various biochars were prepared through treatment at different py-rolysis temperatures and durations,and their yield,heavy metal content,and adsorption performance were systematically analyzed.[Result]The biochar yield decreased with increasing pyrolysis temperature and prolonged pyrolysis time,with sludge-based biochar yielding higher than garden waste-based biochar.The pyrolysis temperature has a significant effect on the ability of biochar to adsorb heavy metals,while the pyrol-ysis time has a relatively small effect on it.Garden waste-based biochar pyrolyzed at 700℃ for 4 h exhibited the best adsorption effect for Pb2+and Cd2+,with adsorption capacities reaching 193.26 and 75.74 mg/g,respectively.Considering yield,energy consumption,and adsorption capacity comprehensively,garden waste-based biochar pyrolyzed at 400℃ for 2 h showed better adsorption performance for Pb2+contamina-tion,while that pyrolyzed at 300℃ for 2 h demonstrated superior adsorption for Cd2+.[Conclusion]This study provides scientific evidence and technical support for the effective management of soil heavy metal contamination,while also promoting the win-win development of waste resource utilization and environmental protection.