Dissolved organic matter derived from biodegradable microplastic promotes photo-aging of coexisting microplastics and alters microbial metabolism

Ouyang，Zhuozhi1,2; Li，Shuxing1; Xue，Jincheng1; Liao，Jinmo1; Xiao，Chuanqi1; Zhang，Hong1; Li，Xiaohan1; Liu，Peng1,2; Hu，Shiwen3; Guo，Xuetao1,2; Zhu，Lingyan1,2,4

2023-03-05

10.1016/j.jhazmat.2022.130564

JOURNAL OF HAZARDOUS MATERIALS   Impact Factor & Quartile

0304-3894

1873-3336

Dissolved organic matter (DOM) leaching from biodegradable microplastics (BMPs) and its characteristics and corresponding environmental implication are rarely investigated. In this study, the main component of DOM leachate from the two BMPs (polyadipate/butylene terephthalate (PBAT)/polycaprolactone (PCL)) was verified by using excitation-emission matrix-parallel factor analysis (EEM-PARAFAC). The PBAT-DOM (PBOM) was aromatized and terrestrial. Comparatively, PCL-DOM (PLOM) had low molecular weight. PBOM contained protein-like components while PLOM contained tryptophan and tyrosine components. Interestingly, both PBOM and PLOM could accelerate the decomposition and oxidation of coexisting polystyrene (PS) under light irradiation. Further, the difference in composition and the properties of BMPs-DOM significantly affected its photochemical activity. The high territoriality and protein-like component of PBOM significantly promoted the generation of O and O, which caused faster disruptions to the backbone of PS. Simultaneously, the microbial community's richness, diversity, and metabolism were obviously improved under the combined pressure of aged PS and BMPs-DOM. This study threw light on the overlooked contribution of DOM derived from BMPs in the aging process of NMPs and their impact on the microbial community and provided a promising strategy for better understanding of combined MPs' fate and environmental risk.

Biodegradable and non-biodegradable MPs Dissolved organic matter Environmental risks Microbial metabolism Photo-aging process

SCI

English

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Scopus

1.College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi,712100,China
2.Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China,Ministry of Agriculture and Rural Affairs,Yangling,Shaanxi,712100,China
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of the Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Key Laboratory of Pollution Processes and Environmental Criteria,Ministry of Education,Tianjin Key Laboratory of Environmental Remediation and Pollution Control,College of Environmental Science and Engineering,Nankai University,Tianjin,300071,China

Ouyang，Zhuozhi,Li，Shuxing,Xue，Jincheng,et al. Dissolved organic matter derived from biodegradable microplastic promotes photo-aging of coexisting microplastics and alters microbial metabolism[J]. JOURNAL OF HAZARDOUS MATERIALS,2023,445.

Ouyang，Zhuozhi.,Li，Shuxing.,Xue，Jincheng.,Liao，Jinmo.,Xiao，Chuanqi.,...&Zhu，Lingyan.(2023).Dissolved organic matter derived from biodegradable microplastic promotes photo-aging of coexisting microplastics and alters microbial metabolism.JOURNAL OF HAZARDOUS MATERIALS,445.

Ouyang，Zhuozhi,et al."Dissolved organic matter derived from biodegradable microplastic promotes photo-aging of coexisting microplastics and alters microbial metabolism".JOURNAL OF HAZARDOUS MATERIALS 445(2023).