Effective degradation of Di-n-butyl phthalate by reusable, magnetic Fe3O4 nanoparticle-immobilized Pseudomonas sp. W1 and its application in simulation. (July 2020)

• Record Type: Journal Article
• Authors: Wang, Qun; Wu, Xiaogang; Jiang, Lanhui; Fang, Chengran; Wang, Hua; Chen, Liang
• Is Part Of: Chemosphere. Volume 250(2020)
• Publication Date: 2020-07
• Subjects: Di-n-butyl phthalate -- Magnetic nanoparticles -- Bioremediation -- Recycling utilization; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.126339
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Di- n -butyl phthalate (DBP), one of the most widely used plasticizers, has been listed as a priority pollutant because of its toxicity to both humans and animals. In this study, Pseudomonas sp. W1, isolated from activated sludge, was capable of degrading 99.88% of DBP (1000 mg L −1 ) within 8 days. We immobilized the W1 strain using Fe3 O4 iron nanoparticles (IONPs) coated with poly-dopamine (PDA), and further evaluated its DBP degradation efficiency. The DBP degradation performance of W1 was improved by immobilization, exhibiting 99.69% of DBP degradation efficiency on the 6th day, which was 25.68% higher than un-immobilized W1. After three cycles of magnetic recycling and utilization, W1-PDA-IONPs retained 99.6% of their original efficiency. W1-PDA-IONPs were then used to degrade DBP in landfill leachate. When the proportion of raw leachate was ≤50%, DBP could be all degraded by W1-PDA-IONPs within 6 days. In 100% landfill leachate, DBP degradation efficiency after 10 days of incubation reached 66.40%. Furthermore, W1-PDA-IONPs cells in a simulated aeration system could be effectively magnetically separated at aeration rates from 60 to 600 mL min −1 . These results highlight the potential of W1-PDA-IONPs in the bioremediation of DBP-contaminated waste water. Graphical abstract: Image 1 Highlights: DBP degradation efficiency of W1 was improved after immobilization by PDA-IONPs. W1-PDA-IONPs retained 99.6% of DBP degradation efficiency after three cycles usage. DBP in 100% landfill leachate was efficiently degraded by W1-PDA-IONPs. Landfill leachate at proportion ≤50% promoted DBP degradation by W1-PDA-IONPs. W1-PDA-IONPs were magnetically separated at aeration rates from 60 to 600 mL min −1 .