环境工程学报2025，Vol.19Issue(8)：1836-1846,11.DOI:10.12030/j.cjee.202411076
葵花籽壳生物炭活化过硫酸盐降解4-氯苯酚的效能与机制
Efficiency and mechanism of sunflower shells biochar-activated persulfate in the degradation of 4-chlorophenol
摘要
Abstract
As the issue of recalcitrant organic pollutants in water bodies intensifies,developing efficient catalysts from agricultural and forestry waste has become a key research focus in environmental management.In this study,a novel biochar(BC)derived from waste sunflower shells was prepared through adjustment of pyrolysis temperature and modification with KOH.The efficiency and mechanism of this biochar in activating persulfate(PDS)for the removal of 4-chlorophenol(4-CP)in water were investigated.The results showed that BC-800 prepared by pyrolysis at 800 ℃ exhibited a large specific surface area,abundant pores,defect structures,with a surface covered with functional groups such as C=O,pyridinium nitrogen,and pyrrole nitrogen.These characteristics collectively constructed dense active sites,providing strong support for 4-CP removal.The BC-800 demonstrated exceptional catalytic activity,achieving 99.02％removal of 4-CP in 120 min,with kads and kobs of 0.121 and 0.0028 min-1,respectively.Moreover,BC-800 maintained high stability and reusability through multiple cycles and still exhibited a high removal rate across a wide pH range(3 to 9).EPR analyses revealed that the removal of 4-CP in the PDS/BC system primarily followed a free radical pathway,with SO4·-and·OH playing significant roles.This study demonstrated the potential of waste sunflower shells in water pollution control,providing new insights to achieve the dual objectives of environmental protection and sustainable development.关键词
葵花籽壳生物炭/农林废弃物/资源化利用/高级氧化技术/过硫酸盐活化/4-氯苯酚Key words
sunflower shells biochar/agricultural and forestry wastes/resource utilization/advanced oxidation process/persulfate activation/4-Chlorophenol分类
资源环境引用本文复制引用
陈泽琳,金月正,刘晓亚,吴义诚,高攀峰,傅海燕..葵花籽壳生物炭活化过硫酸盐降解4-氯苯酚的效能与机制[J].环境工程学报,2025,19(8):1836-1846,11.基金项目
福厦泉国家自主创新示范区城乡生态环境治理提升关键技术协同创新平台项目(2022-P-024) （2022-P-024）
厦门市自然科学基金(3502Z20227214) （3502Z20227214）
