title: Application of Novel Amino-Functionalized NZVI@SiO2 Nanoparticles to Enhance Anaerobic Granular Sludge Removal of 2,4,6-Trichlorophenol.
abstract: A novel amino-functionalized silica-coated nanoscale zerovalent iron (NZVI@SiO2-NH2) was successfully synthesized by using one-step liquid-phase method with the surface functionalization of nanoscale zerovalent iron (NZVI) to enhance degradation of chlorinated organic contaminants from anaerobic microbial system. NZVI@SiO2-NH2 nanoparticles were synthesized under optimal conditions with the uniform core-shell structure (80-100 nm), high loading of amino functionality (~0.9 wt%), and relatively large specific surface area (126.3 m(2)/g). The result demonstrated that well-dispersed NZVI@SiO2-NH2 nanoparticle with nFe(0)-core and amino-functional silicon shell can effectively remove 2,4,6-trichlorophenol (2,4,6-TCP) in the neutral condition, much higher than that of NZVI. Besides, the surface-modified nanoparticles (NZVI@SiO2-NH2) in anaerobic granule sludge system also showed a positive effect to promote anaerobic biodechlorination system. More than 94.6% of 2,4,6-TCP was removed from the combined NZVI@SiO2-NH2-anaerobic granular sludge system during the anaerobic dechlorination processes. Moreover, adding the appropriate concentration of NZVI@SiO2-NH2 in anaerobic granular sludge treatment system can decrease the toxicity of 2,4,6-TCP to anaerobic microorganisms and improved the cumulative amount of methane production and electron transport system activity. The results from this study clearly demonstrated that the NZVI@SiO2-NH2/anaerobic granular sludge system could become an effective and promising technology for the removal of chlorophenols in industrial wastewater.
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Zeyu
authors.initials: Z
authors.lastname: Guan
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China ; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wan
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China ; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Yongwen
authors.initials: Y
authors.lastname: Ma
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China ; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China.
authors.forename: Yajie
authors.initials: Y
authors.lastname: Shu