Characterization of NH4** (+) and Zn** (2+) adsorption by Korean natural zeolites
1989
Kang, S.J. (Jungbu Socio-Industrial Coll., Kumsangun (Korea R.))
The adsorption of NH4** (+) and Zn** (2+) by four Korean zeolites, the major species of which are clinoptilolite, clinoptilolite with mordenite, mordenite with clinoptilolite, and mordenite was measured in different concentrations of solutions of NH4** (+), and their mixtures. The adsorption of NH4** (+) was greater than that of Zn** (2+) for all samples at the concentrations of the added solutions from 1 to 7 x 10** (-3)N and this difference was greater at the higher concentration. Also, Zn** (2+) adsorption by samples was decreased by the presence of NH4** (+). The extent of NH4** (+) selectivity among samples was increased in order of clinoptilolite with mordenite clinoptilolite mordenite with clinoptilolite mordenite. Cumulative amounts of NH4** (+) and Zn** (2+) each at a concentration of 3 x 10** (-3)N were in range from 43.7 to 50.4 me/100g, whereas those amounts of Zn** (2+) were in the range from 6.6 to 17.0 me/100g. It was suggested from these results that mordenite and clinoptilolite, particularly the former, can be used for removal of NH4** (+) from municipal wastewater and those zeolites treated with wastewater can be applied to agricultural land
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