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DOI	10.1016/j.atmosenv.2020.117427
	Formation of brown carbon on Fe-bearing clay from volatile phenol under simulated atmospheric conditions
	Ling J.; Sheng F.; Wang Y.; Peng A.; Jin X.; Gu C.
发表日期	2020
ISSN	1352-2310
卷号	228
英文摘要	Atmospheric brown carbon (BrC) has recently attracted great concerns due to its potential contribution to climate change. It was reported that dissolved Fe(III) species can act as an efficient oxidant to catalyze the polymerization of volatile phenol substances, subsequently forming atmospheric BrC in aerosols. Since Fe in the atmosphere is commonly associated with clay mineral dusts, the transformation of phenol substances on Fe-bearing clay mineral surface is potentially important for BrC formation. In this study, taking guaiacol as the model phenol substance, its brown carbon formation process was investigated on Fe(III) modified montmorillonite under different relative humidities (RHs). The spectroscopic features and compositions of the produced BrC were systematically characterized. The results demonstrated that the interface FeOH2+ is the key species to promote the polymerization of guaiacol, and RH plays a significant role to influence the surface acidity of clay and the gas-to-particle adsorption of guaiacol. The BrC was produced with the most abundance and variety under moderate RH (~33%), while higher RH (~100%) accelerated the polymerization rate. Since aerosol moisture content might not largely influence the hydroxylation states of the surface bearing Fe(III) species, it signifies the importance of clay associated Fe(III) to catalyze the BrC formation in varied conditions Our study highlights the importance of clay mineral dust on the formation of BrC, and reveals the brown carbon formation pathways under environmentally relevant conditions. © 2020 Elsevier Ltd
关键词	Brown carbon Fe-bearing clay Guaiacol Relative humidity
语种	英语
scopus关键词	Aerosols; Alcohols; Atmospheric humidity; Carbon; Clay minerals; Climate change; Dust; Iron compounds; Phase interfaces; Phenols; Polymerization; Atmospheric conditions; Fe(III) modified; Mineral surfaces; Particle adsorption; Polymerization rates; Spectroscopic features; Surface acidity; Volatile phenols; Bromine compounds; carbon; ferric ion; guaiacol; montmorillonite; phenol; volatile agent; brown carbon; clay mineral; moisture content; oxidant; phenol; polymerization; relative humidity; transformation; volatile substance; acidity; adsorption; Article; atmospheric deposition; chemical structure; density functional theory; humidity; hydroxylation; polymerization; priority journal; reaction analysis; spectroscopy; surface property
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249221
作者单位	State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China
推荐引用方式 GB/T 7714	Ling J.,Sheng F.,Wang Y.,et al. Formation of brown carbon on Fe-bearing clay from volatile phenol under simulated atmospheric conditions[J],2020,228.
APA	Ling J.,Sheng F.,Wang Y.,Peng A.,Jin X.,&Gu C..(2020).Formation of brown carbon on Fe-bearing clay from volatile phenol under simulated atmospheric conditions.ATMOSPHERIC ENVIRONMENT,228.
MLA	Ling J.,et al."Formation of brown carbon on Fe-bearing clay from volatile phenol under simulated atmospheric conditions".ATMOSPHERIC ENVIRONMENT 228(2020).