生物炭粒径对其内源多环芳烃光催化降解的影响

doi:10.14088/j.cnki.issn0439-8114.2025.02.003

摘要/Abstract

摘要： 为了探索和优化生物炭内源多环芳烃（PAHs）光催化降解去除的技术与工艺,以玉米秸秆生物炭为研究对象,制备不同粒径的生物炭（>1.0 mm、0.5~1.0 mm、0.001~0.5 mm）,开展TiO₂-光催化降解试验,系统分析生物炭基础特性以及不同粒径生物炭内源PAHs的降解去除效果。结果表明,玉米秸秆生物炭内源PAHs达76.1 mg/kg,以4环和5环为主,远超国际生物炭协会规定的基础生物炭PAHs限值（20 mg/kg）。TiO₂-光催化可明显降低生物炭内源PAHs含量,光催化降解后3种粒径生物炭内源PAHs含量为3.3~14.9 mg/kg,PAHs总降解率为55.2%~95.6%,高环PAHs降解率最高达97.1%,低环PAHs降解率最高达62.0%。0.001~0.5 mm粒径的生物炭在光照40 min时降解率最大,为95.6%,毒性当量值由9.096 mg/kg降低到0.088 mg/kg,明显低于欧洲生物炭认证机构（4 mg/kg）和国际生物炭协会（6 mg/kg）规定的阈值。研究表明,TiO₂-光催化能够有效降解不同粒径生物炭内源PAHs,可为生物炭及其产品在农田应用方面提供安全保障。

关键词: 生物炭, 粒径, 多环芳烃, 光催化降解, 当量毒性

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 endogenous PAHs content in corn stover biochar was 76.1 mg/kg, predominantly comprising 4-ring and 5-ring PAHs, significantly exceeding 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 International Biochar Initiative（6 mg/kg）. The study demonstrated that TiO₂-photocatalysis effectively degraded endogenous PAHs in biochar of different particle sizes, ensuring the safety of biochar and its products for application in agricultural fields.

Key words: biochar, particle size, polycyclic aromatic hydrocarbons, photocatalytic degradation, equivalent toxicity

中图分类号:

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.

GE Yun-yu, SHEN Xiu-li, MENG Hai-bo, FENG Jing, CONG Hong-bin, WEN Feng-rui, ZHANG Wen-jing. Effect of biochar particle size on photocatalytic degradation of endogenous polycyclic aromatic hydrocarbons[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(2): 13-20.

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