Attempt to adsorb N-nitrosamines in solution by use of zeolites.
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.
Zhu
J H
JH
Department of Chemistry, Nanjing University, People's Republic of China. jhzhu@netra.nju.edu.cn
Yan
D
D
Xai
J R
JR
Ma
L L
LL
Shen
B
B
D000327:Adsorption; D004785:Environmental Pollutants; D006863:Hydrogen-Ion Concentration; D009602:Nitrosamines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D017641:Zeolites / Q000737:chemistry*
D004785:Environmental Pollutants; D009602:Nitrosamines; D012997:Solvents; D017641:Zeolites