钯掺杂纳米塑料对产甲烷颗粒污泥的影响  

Effect of palladium-doped nanoplastics on methanogenic granular sludge

作　　者：刘美艳 王倩[1] 袁宪正 祝凡平 LIU Meiyan;WANG Qian;YUAN Xianzheng;ZHU Fanping(School of Environmental Science and Engineering,Shandong University,Qingdao Shandong 266237)

机构地区：[1]山东大学环境科学与工程学院,山东青岛266237

出　　处：《环境污染与防治》2023年第6期783-790,共8页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.51478453,No.21776163);山东省自然科学基金资助项目(No.ZR2019JQ18,No.ZR2020QD134)。

摘　　要：金属掺杂纳米塑料已被广泛应用在纳米塑料的环境行为与生物效应研究中,但其中掺杂的金属是否会对其生物效应产生影响尚不清楚。以厌氧颗粒污泥为研究对象,基于乳液聚合的方法合成钯(Pd)掺杂的纳米塑料(Pd-NPs),研究它对污泥厌氧消化系统产甲烷性能、微生物群落分布和污泥胞外聚合物的影响。结果表明,Pd-NPs中的Pd会随时间的推移溶出,并通过提高厌氧消化系统中地杆菌(Geobacter)的相对丰度促进电子传递进而促进污泥厌氧消化系统产甲烷量;傅立叶变换红外光谱和三维荧光光谱结果显示,Pd-NPs能够与厌氧颗粒污泥表面胞外聚合物中蛋白质和腐殖酸类物质发生相互作用,使污泥颗粒更易絮凝。这些结果为评估金属掺杂的纳米塑料对厌氧消化系统的影响提供了一定的数据支撑。Metal-doped nanoplastics have been widely used in the study of environmental behavior and biological effects of nanoplastics,but it is unclear whether the doped metals have impact on their biological effects.Palladium(Pd)-doped nanoplastics(Pd-NPs)were synthesized based on emulsion polymerization.And the effects of Pd-NPs on methanogenic performance,community distribution and extracellular polymeric substance(EPS)of sludge anaerobic digestion system were investigated.The results showed that Pd in Pd-NPs leaked out over time and promoted methane production by increasing the relative abundance of Geobacter in the anaerobic digestion system.In addition,Fourier transform infrared spectroscopy and three-dimensional fluorescence spectroscopy showed that Pd-NPs could interact with proteins and humic acids in EPS,leading aggregation of the sludge particles.These results could provide some data support to evaluate the effect of metal-doped nanoplastics on anaerobic digestion systems.

关 键 词：厌氧颗粒污泥 钯掺杂纳米塑料 产甲烷性能 直接电子传递 胞外聚合物 

分 类 号：X703[环境科学与工程—环境工程] X17[化学工程—合成树脂塑料工业] TQ320.7