摘要
溶解性黑碳(DBC)是表层水体中的重要光活性组分,受水中共存物质的影响.微塑料是一类新污染物,在水环境中不断被检出.研究证实了微塑料可与DBC发生吸附等作用影响DBC的分散、团聚等环境行为,但微塑料对DBC光化学活性的影响尚未见报道.本文研究了微塑料对DBC光谱参数及光化学活性的影响,结果表明,在微塑料存在条件下光照后的DBC溶液的紫外吸光度、光化学活性均强于单独光照的DBC,且前者芳香蛋白的荧光丰度损失程度也小于后者.此外,黑色微塑料存在时对DBC溶液紫外吸光度、光化学活性及荧光丰度变化的影响大于另外两种白色微塑料.相同光照时间下,DBC存在的光照体系下微塑料表面产生的碎屑、裂纹多于微塑料单独光照产生的;傅里叶红外光谱(FTIR)结果也显示DBC作用条件下微塑料光照后引入了O-H等含氧官能团,说明DBC促进了微塑料的光老化.
Dissolved black carbon(DBC)was an important photoactive component in surface waters and was influenced by co-occurring substances in the water.Microplastics were a new class of pollutants that are constantly detected in the aqueous environment.Studies had confirmed that microplastics can affect the environmental behavior of DBC such as dispersion and agglomeration by adsorption and other interactions with DBC,but the effect of microplastics on the photochemical activity of DBC was not reported.In this paper,we investigated the effects of microplastics on the spectral parameters and photochemical activity of DBC.The results showed that the UV absorbance and photochemical activity of DBC solutions after illumination in the presence of microplastics were stronger than those of DBC illuminated alone,and the loss of fluorescence abundance of aromatic proteins in the former was also smaller than that in the latter.In addition,the effect of the presence of black microplastics on the changes of UV absorbance,photochemical activity and fluorescence abundance of DBC solution was greater than that of the other two white microplastics.Under the same light time,more debris and cracks were produced on the surface of microplastics in the light system in the presence of DBC than those produced by microplastics alone;Fourier transform infrared spectroscopy(FTIR)results also showed that oxygen-containing functional groups such as O-H were introduced into microplastics after light exposure under the conditions of DBC action,indicating that DBC promoted the photoaging of microplastics.
作者
吴玮琳
李英杰
唐威
屠依娜
WU Weilin;LI Yingjie;TANG Wei;TU Yina(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming,650500,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第12期4265-4274,共10页
Environmental Chemistry
基金
国家自然科学基金(22266020)
云南省基础研究计划项目(202201AT070097)资助.
关键词
溶解性黑碳
光化学
微塑料
光老化.
dissolved black carbon
photochemistry
microplastics
photoaging
