title: Attempt to adsorb N-nitrosamines in solution by use of zeolites.
abstract: The strong adsorption of zeolite for N-nitrosamines in solution was first revealed by use of adsorption, and temperature programmed surface reaction (TPSR) techniques. N-nitrosodimethylamine (NDMA) and N-nitrosopyrrolidine (NPYR) as well as N-nitrosohexamethyleneimine (NHMI) can be adsorbed on zeolite Y, ZSM-5 and A in the solution of methylene chloride or water, which will be helpful for removal of the N-nitrosamines pollution in environmental protection. The equilibrium data were fitted to Freundlich-type isotherms, but the adsorption capacity of zeolites mainly depended on their pore size, surface area and acid-basic properties. Molecular size of adsorbate and solute-solvent interaction also strongly affected the adsorption of N-nitrosamines on zeolite in solution. The extraordinary adsorption properties of NaA zeolite for N-nitrosamines in aqueous solution is first reported and discussed.
authors.affiliation: Department of Chemistry, Nanjing University, People's Republic of China. jhzhu@netra.nju.edu.cn
authors.forename: J H
authors.initials: JH
authors.lastname: Zhu
authors.forename: D
authors.initials: D
authors.lastname: Yan
authors.forename: J R
authors.initials: JR
authors.lastname: Xai
authors.forename: L L
authors.initials: LL
authors.lastname: Ma
authors.forename: B
authors.initials: B
authors.lastname: Shen
mesh_terms: D000327:Adsorption; D004785:Environmental Pollutants; D006863:Hydrogen-Ion Concentration; D009602:Nitrosamines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D017641:Zeolites / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D009602:Nitrosamines; D012997:Solvents; D017641:Zeolites