湖北农业科学2025，Vol.64Issue(2)：13-20,8.DOI:10.14088/j.cnki.issn0439-8114.2025.02.003
生物炭粒径对其内源多环芳烃光催化降解的影响
Effect of biochar particle size on photocatalytic degradation of endogenous polycyclic aromatic hydrocarbons
摘要
Abstract
To explore and optimize the technology and process of photolytic removal of endogenous polycyclic aromatic hydrocarbons(PAHs)in biochar,this study focused on corn stover biochar.Biochar with different particle sizes(>1.0 mm,0.5～1.0 mm,0.001～0.5 mm)was prepared,and TiO2-photocatalytic degradation experiments were conducted to systematically analyze the characteristics of the biochar and the efficacy of degrading and removing endogenous PAHs with different particle sizes.The results showed that the en-dogenous PAHs content in corn stover biochar was 76.1 mg/kg,predominantly comprising 4-ring and 5-ring PAHs,significantly ex-ceeding the limit value for basic biochar PAHs(20 mg/kg)set by the International Biochar Initiative(IBI).TiO2-photocatalysis could significantly reduce the content of endogenous PAHs in biochar.After photocatalytic degradation,the endogenous PAHs content in the three particle sizes of biochar ranged from 3.3 to 14.9 mg/kg,with degradation rates for total PAHs ranging from 55.2%to 95.6%.The maximum degradation rate for high-ring PAHs reached 97.1%,while low-ring PAHs reached 62.0%.The 0.001～0.5 mm particle size biochar exhibited the highest degradation rate of 95.6%after 40 minutes of light exposure,and the toxicity equivalent value decreased from 9.096 mg/kg to 0.088 mg/kg,significantly below the thresholds set by the European Biochar Certification(4 mg/kg)and the Inter-national Biochar Initiative(6 mg/kg).The study demonstrated that TiO2-photocatalysis effectively degraded endogenous PAHs in bio-char of different particle sizes,ensuring the safety of biochar and its products for application in agricultural fields.关键词
生物炭/粒径/多环芳烃/光催化降解/当量毒性Key words
biochar/particle size/polycyclic aromatic hydrocarbons/photocatalytic degradation/equivalent toxicity分类
化学化工引用本文复制引用
葛芸妤,沈秀丽,孟海波,冯晶,丛宏斌,温冯睿,张文静..生物炭粒径对其内源多环芳烃光催化降解的影响[J].湖北农业科学,2025,64(2):13-20,8.基金项目
农业农村部规划设计研究院农规英才计划项目(QNYC-2021-05) （QNYC-2021-05）
