Lanthanum-modified polydopamine loaded Acinetobacter lwoffii DNS32 for phosphate and atrazine removal: Insights into co-adsorption and biodegradation mechanisms. (January 2023)

• Record Type: Journal Article
• Authors: Han, Siyue; Tao, Yue; Cui, Yunhe; Xu, Jiaming; Ju, Hanxun; Fan, Linlin; Zhang, Lin; Zhang, Ying
• Is Part Of: Bioresource technology. Volume 368(2023)
• Publication Date: 2023-01
• Subjects: Multiple pollutants -- Immobilized -- Biocomposites -- DFT calculations -- Transmembrane transport; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.128266
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: La/PDA/DNS32 had superior performance in the removal of P and atrazine. The La/PDA nanoparticles provided a distinct protective effect for strain DNS32. La/PDA-induced sorption facilitated atrazine transmembrane transport. Doping with La increased electrophilic sites and reduced adsorption energy. Abstract: A novel biobased composite was developed for the removal of phosphate (P) and atrazine from agricultural wastewater. A composite with strong P affinity and good biocompatibility, synthesized from La 3+ and polydopamine (PDA), was immobilized onto an atrazine-degrading bacterium Acinetobacter lwoffii DNS32 (La/PDA/DNS32). Following Box-Behnken design optimization, the maximum removal rate of P (500 mg L -1 ) and atrazine (100 mg L -1 ) by La/PDA/DNS32 reached 28 % and 100 %, respectively. Density functional theory calculations revealed that La/PDA had more negative adsorption energy (−5.90 eV) than PDA alone and exhibited prominent electrophilic sites. Additionally, La/PDA-induced sorption of atrazine improved transmembrane transport and enhanced expression of degradation-associated genes in strain DNS32. La/PDA nanoparticles surrounding strain DNS32 provided a shielding effect and exhibited desirable biostability, thermal stability, and acid-alkaline resistance under contamination stress. This study demonstrates the promising potential of La/PDA/DNS32 in reducing the P and atrazine pollution caused by agricultural production.