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.
关键词
溶解性黑碳/光化学/微塑料/光老化
Key words
dissolved black carbon/photochemistry/microplastics/photoaging
维普
万方数据