title: Ultraviolet-assisted synthesis of polyacrylamide-grafted chitosan nanoparticles and flocculation performance.
abstract: In the present work, a new flocculant, polyacrylamide-grafted chitosan nanoparticles (NCS-g-PAM), was synthesized by the copolymerization of acrylamide (AM) and chitosan nanoparticle (NCS) under ultraviolet irradiation using 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone as photo-initiator. The NCS was prepared by the ionic gelation between chitosan and sodium tripolyphosphate. The structure and morphology of NCS-g-PAM were characterized by Fourier Transform Infraredspectroscopy (FT-IR), X-ray diffraction, (1)H-nuclear magnetic resonance spectrometry, scanning electron microscopy, and thermogravimetric analysis. The factors affecting the intrinsic viscosity and the yield of copolymer were studied, which showed that the optimum conditions for the synthesis of NCS-g-PAM were mAM:mNCS=8:1, 0.15g of initiator dosage, mCS:mTPP=4.5:1, 1min of ultrasonication time, 4h of illumination time, and 30min of stirring time. The NCS-g-PAM was found to be more effective than NC-g-PAM in the flocculation of both kaolin suspension and Cu(2+) simulated wastewater. With 5mg/L of polyaluminium chloride (PAC) coordinated and 1mg/L of NCS-g-PAM it was confirmed to be appropriate for flocculating kaolin suspension.
authors.affiliation: School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China. Electronic address: majiang_ya@126.com.
authors.forename: Jiangya
authors.initials: J
authors.lastname: Ma
authors.affiliation: School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Fu
authors.affiliation: School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Shi
authors.affiliation: Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, College of Urban Construction, Nanjing Tech University, Nanjing 211800, China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
authors.forename: Xinxi
authors.initials: X
authors.lastname: Zhang
authors.affiliation: School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui 243002, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Ding
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D005427:Flocculation; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D066244:Proton Magnetic Resonance Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D048271:Chitosan; D000099166:Polyacrylamides
keywords: Characterization; Chitosan nanoparticles; Flocculation; Graft copolymer; Ultraviolet initiation