title: Hollow latex particles functionalized with chitosan for the removal of formaldehyde from indoor air.
abstract: Chitosan and polyethyleneimine (PEI) functionalized hollow latex (HL) particles were conveniently fabricated by coating poly(methyl methacrylate-co-divinyl benzene-co-acrylic acid) (P(MMA/DVB/AA)) HL particles with 5 wt% chitosan or 14 wt% PEI. The materials were used as formaldehyde adsorbent, where their adsorbent activity was examined by Fourier Transform Infrared (FTIR) spectroscopy. The nucleophilic addition of amines to carbonyls generated a carbinolamine intermediate with a characteristic band at 1,020 cm(-1) and Schiff base product at 1650 cm(-1), whose intensity increased with prolonged formaldehyde exposure times. The major products observed in HL-chitosan were carbinolamine and Schiff base, whereas a small amount of Schiff base was obtained in HL-PEI particles, confirming a chemical bond formation without re-emission of formaldehyde. Compared to HL-PEI, HL-chitosan possesses higher formaldehyde adsorption efficiency. Besides providing opacity and whiteness, the multilayer HL-chitosan particles can effectively remove indoor air pollutants, i.e., formaldehyde gas, and, hence, would be useful in special coating applications.
authors.affiliation: Department of Chemistry, Faculty of Science, Mahidol University, Rama 6 Road, Phyathai, Bangkok 10400, Thailand. Electronic address: sukanyanuasaen@hotmail.com.
authors.forename: Sukanya
authors.initials: S
authors.lastname: Nuasaen
authors.forename: Pakorn
authors.initials: P
authors.lastname: Opaprakasit
authors.forename: Pramuan
authors.initials: P
authors.lastname: Tangboriboonrat
mesh_terms: D000179:Acrylates / Q000737:chemistry; D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry* / Q000302:isolation & purification*; D016902:Air Pollution, Indoor; D000588:Amines / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry* / Q000302:isolation & purification*; D007840:Latex / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry
chemical_list: D000179:Acrylates; D000393:Air Pollutants; D000588:Amines; D007840:Latex; D014753:Vinyl Compounds; D005557:Formaldehyde; D011094:Polyethyleneimine; D019904:Polymethyl Methacrylate; D048271:Chitosan; C004985:divinyl benzene; C036658:acrylic acid
keywords: Chitosan; Formaldehyde adsorption; Hollow latex particle; Polyethyleneimine