title: Adsorption characteristics of N-nitrosodimethylamine from aqueous solution on surface-modified activated carbons.
abstract: This study investigated the removal of N-nitrosodimethylamine (NDMA) by an adsorption mechanism using commercially available activated carbons and surface-modified activated carbons. The effects of the modification on the properties of the activated carbon were studied by N(2) adsorption/desorption, Diffuse Reflectance Infrared Fourier Transmission (DRIFT) analysis and X-Ray Photoelectron Spectroscopy (XPS). Adsorption experiments revealed that the activated carbons demonstrated a greater capacity for NDMA adsorption capacity than can be achieved using zeolite. The equilibrium data was fitted to the Freundlich equation and it was found that the adsorption capacity was significantly influenced by the micropore size, relative pore volume and surface characteristics. Adsorption experiments were conducted using unmodified and modified activated carbons. The results indicated that the adsorption capacity of NDMA can be significantly improved by heat treatment and doping of TiO(2) particles. This was because the surface treatments yielded more hydrophobic sites and fewer oxygen-containing surface functional groups, and consequently an increased capacity for NDMA adsorption.
authors.affiliation: Chemistry and Chemical Engineering School, China University of Petroleum, Dongying, Shandong, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Dai
authors.forename: Linda
authors.initials: L
authors.lastname: Zou
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Yan
authors.forename: Mary
authors.initials: M
authors.lastname: Millikan
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry*; D004128:Dimethylnitrosamine / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
chemical_list: D014874:Water Pollutants, Chemical; D002606:Charcoal; D004128:Dimethylnitrosamine