title: Adsorption and transformation of PAHs from water by a laccase-loading spider-type reactor.
abstract: The remediation of polycyclic aromatic hydrocarbons (PAHs) polluted waters has become a concern as a result of the widespread use of PAHs and their adverse impacts on water ecosystems and human health. To remove PAHs rapidly and efficiently in situ, an active fibrous membrane, laccase-loading spider-type reactor (LSTR) was fabricated by electrospinning a poly(D,L-lactide-co-glycolide) (PDLGA)/laccase emulsion. The LSTR is composed of beads-in-string structural core-shell fibers, with active laccase encapsulated inside the beads and nanoscale pores on the surface of the beads. This structure can load more laccase and retains higher activity than do linear structural core-shell fibers. The LSTR achieves the efficient removal/degradation of PAHs in water, which is attributed to not only the protection of the laccase activity by the core-shell structure but also the pre-concentration (adsorption) of PAHs on the surface of the LSTR and the concentration of laccase in the beads. Moreover, the effects of pH, temperature and dissolved organic matter (DOM) concentration on the removal of PAHs by the LSTR, in comparison with that by free laccase, have been taken into account. A synergetic mechanism including adsorption, directional migration and degradation for PAH removal is proposed.
authors: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China. junfengn@bnu.edu.cn
authors: Junfeng
authors: J
authors: Niu
authors: Yunrong
authors: Y
authors: Dai
authors: Huiyuan
authors: H
authors: Guo
authors: Jiangjie
authors: J
authors: Xu
authors: Zhenyao
authors: Z
authors: Shen
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D042845:Laccase / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry*; D008567:Membranes, Artificial; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods
chemical_list: D008567:Membranes, Artificial; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D042845:Laccase