微塑料介导下苯并[a]芘的吸附和微生物降解途径  

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

作　　者：叶金明 罗雅嫣 汤蕙齐 欧阳浩民 解启来[1] 陈烁娜[1,2] YE Jin-ming;LUO Ya-yan;TANG Hui-qi;OUYANG Hao-ming;XIE Qi-lai;CHEN Shuo-na(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China;Guangdong Provincial Key Laboratory of Agricultural&Rural Pollution Abatement and Environmental Safety,Guangzhou 510642,China)

机构地区：[1]华南农业大学资源环境学院,广东广州510642 [2]广东省农业农村污染治理与环境安全重点实验室,广东广州510642

出　　处：《中国环境科学》2023年第12期6712-6722,共11页China Environmental Science

基　　金：广东省自然科学基金资助项目-青年提升项目(2023A1515030284),广东省重点领域研发计划项目(2020B0202080001);广州市重点研发计划项目(202206010162)。

摘　　要：为研究微塑料对水体中多环芳烃吸附和微生物降解等环境行为的影响,选取聚丙烯微塑料(MP-PP)和苯并[a]芘(BaP)为研究对象,探讨MP-PP对BaP的吸附特性和机制,及MP-PP介导对新鞘氨醇单胞菌(Novosphingobium tardaugens)降解BaP的能力和途径的影响.同时,利用X射线光电子能谱和傅里叶转换红外线光谱对MP-PP、BaP和菌体间相互作用的微观特性进行探究.结果表明,MP-PP对BaP的吸附遵循准二级动力学模型和单分子层覆盖,升温有利于吸附;MP-PP共存可提高Novosphingobium tardaugens对BaP的去除率,但是并不影响菌体对BaP的降解途径;MP-PP、BaP和菌体间的互相作用主要发生在表面,微塑料作为载体;菌体虽不能降解MP-PP,但能附着在其表面生长,有利于菌体的生长繁殖,进而提高降解效果.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.

关 键 词：微塑料 苯并[A]芘 吸附 微生物降解 微观特性 降解途径 

分 类 号：X52[环境科学与工程—环境工程]