Adsorption and biodegradation pathway of benzo[a]pyrene mediated by microplastics

YE Jin-ming; LUO Ya-yan; TANG Hui-qi; OUYANG Hao-ming; XIE Qi-lai; CHEN Shuo-na

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6712-6722.

Emerging Contaminants

Adsorption and biodegradation pathway of benzo[a]pyrene mediated by microplastics

YE Jin-ming^1,2, LUO Ya-yan^1,2, TANG Hui-qi^1,2, OUYANG Hao-ming^1,2, XIE Qi-lai¹, CHEN Shuo-na^1,2

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Abstract

To investigate the adsorption and biodegradation of polycyclic aromatic hydrocarobons in the presence of microplastics, polypropylene-microplastics (MP-PP) and benzo[a]pyrene (BaP) were chosen as research materials. The aim was to explore the adsorption behavior and mechanism of BaP onto MP-PP, as well as its biodegradation pathway mediated by Novosphingobium tardaugens using MP-PP. The interaction and microscopic characteristics among MP-PP, BaP and strains were examined using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The results indicated that the adsorption of BaP onto MP-PP followed the pseudo-second-order kinetic model with monolayer coverage, and this process was enhanced by higher temperatures. The presence of MP-PP improved the efficiency of BaP degradation. However, the degradation pathway of BaP by Novosphingobium tardaugens remained unaffected by MP-PP and continued to follow the phthalic acid pathway. The interaction among MP-PP, BaP, and strains primarily occurred at the surface, with microplastics PP serving as adsorption carriers. Although Novosphingobium tardaugens could not decompose MP-PP, it could adhere to the PP surface, facilitating growth, and thereby enhancing the degradation process.

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adsorption / benzo[a]pyrene / biodegradation / metabolic pathway / microplastics / microscopic characteristics

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YE Jin-ming, LUO Ya-yan, TANG Hui-qi, OUYANG Hao-ming, XIE Qi-lai, CHEN Shuo-na. Adsorption and biodegradation pathway of benzo[a]pyrene mediated by microplastics[J]. China Environmental Science. 2023, 43(12): 6712-6722

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