Print Email Facebook Twitter Contribution of extracellular polymeric substances fractions to the adsorption of silver nanoparticles by activated sludge Title Contribution of extracellular polymeric substances fractions to the adsorption of silver nanoparticles by activated sludge Author Xu, Yanghui (TU Delft Sanitary Engineering; Chongqing University) Ou, Qin (Chongqing University) He, Qiang (Chongqing University) Wu, Zhengsong (Chongqing University) Ma, Jun (Harbin Institute of Technology) Huangfu, Xiaoliu (Chongqing University) Date 2022 Abstract The extracellular polymeric substances (EPS) from activated sludge played significant roles in the removal of nanoparticles from wastewater. A series of batch experiments were carried out to determine the adsorption mechanism of three nano-Ag by activated sludge, as well as the contributions of EPS fractions including dissolved EPS (DEPS), loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). The results demonstrated that the adsorption of nano-Ag by sludge biomass agreed with pseudo-second-order kinetic reaction model and Freundlich isotherm model. About 26.0-41.2% of nano-Ag was trapped by the bound EPS (BEPS) matrix of activated sludge (especially LB-EPS) and 42.5-52.6% of them was adsorbed onto the inner cells after the adsorption. Moreover, the interaction energy contributions of EPS fractions followed the order of EDE > 0 > ETB > ELB, suggesting DEPS in wastewater went against the removal of nano-Ag due to steric repulsion while LB-EPS and TB-EPS were positive to nano-Ag adsorption by modifying biomass surface and providing extensive binding sites. Besides, EPS fractions played significant roles in the adsorption of nano-Ag with low initial concentrations but had limited effect at high concentrations. Overall, this study investigated the effect of EPS fractions on the adsorption behaviors of nano-Ag by activated sludge biomass, which is meaningful to understand the removal mechanism of nanoparticles in sewage and the potential role of EPS fractions. Subject Activated sludgeAdsorptionExtracellular polymeric substancesSilver nanoparticles To reference this document use: http://resolver.tudelft.nl/uuid:a3f72426-fa28-4114-bb59-ebbf34f3e058 DOI https://doi.org/10.1016/j.jece.2022.108316 Embargo date 2023-07-01 Source Journal of Environmental Chemical Engineering, 10 (5) Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Yanghui Xu, Qin Ou, Qiang He, Zhengsong Wu, Jun Ma, Xiaoliu Huangfu Files PDF 1_s2.0_S2213343722011897_main.pdf 2.27 MB Close viewer /islandora/object/uuid:a3f72426-fa28-4114-bb59-ebbf34f3e058/datastream/OBJ/view