Natural lead-enriched biochar modifies TiO2 photocatalytic activation of sodium persulfate to degrade 2,4-dichlorophenolXiangxin Lu, Wenbing Tan, Beidou Xi and Xiuyun ZhaoE3S Web Conf., 233 (2021) 01111DOI: https://doi.org/10.1051/e3sconf/202123301111