Sustainable management of campus fallen leaves through low-temperature pyrolysis and application in Pb immobilization  

作　　者：Rongli Tan Ke Li Yue Sun Xiaoliang Fan Zhengtao Shen Lingyi Tang 

机构地区：[1]School of Environment,Nanjing University,Nanjing 210023,China [2]School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,China [3]School of Earth and Engineering Sciences,Nanjing University,Nanjing 210023,China [4]Department of Earth and Atmospheric Sciences,University of Alberta,Edmonton T6G 2E3,Canada

出　　处：《Journal of Environmental Sciences》2024年第5期281-292,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.42277123);Natural Science Foundation of Jiangsu Province(No.BK20220787)。

摘　　要：Realizing campus sustainability requires the environmental-friendly and economical treatment of tremendous fallen leaves.Producing fallen leaf biochar at a low temperature is a candidate approach.In this study,six common types of fallen leaves on the campus were pyrolyzed at 300℃.The obtained biochars were characterized and the adsorption mechanisms of lead(Pb)by the fallen leaf biochars were investigated.The adsorption capacity of leaf biochar for Pb was relatively high,up to 209 mg/g(Yulania denudata leaf biochar).Adsorption of Pb onto active sites was the rate-limiting step for most leaf biochars.But for Platanus leaf biochar,intraparticle diffusion of Pb^(2+)dominated owing to the lowest adsorption capacity.However,the highest exchangeable Pb fraction(27%)indicated its potential for removing aqueous Pb^(2+).Ginkgo and Prunus cerasifera leaf biochar immobilized Pb by surface complexation and precipitation as lead oxalate.Hence,they were suitable for soil heavy metal remediation.This study shed the light on the sustainable utilization of campus fallen leaves and the application of fallen leaf biochars in heavy metal remediation.

关 键 词：Fallen leaves Waste management BIOCHAR Lead removal SORPTION Circular campus 

分 类 号：X70[环境科学与工程—环境工程]