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- W133505415 abstract "Environmentally friendly treatment methods for heavy metals prior to discharge areconsidered favourable so as to protect ecosystems. The performance of modified zeolite fromtwo different sources (South African and the USA) for the adsorption of Ni2+, Cd2+ and Pb2+from synthetic industrial effluent contaminated with metal concentration levels at 50, 150 and500mg/L was assessed. The selectivity of the zeolite for the adsorption of Ni2+, Cd2+ and Pb2+was investigated at mixed feed solutions containing all three ions in equal concentrations andsingle component concentrations containing only one of the ions. The homoionic forms of thezeolite were made Na+, K+ and Ca2+. Batch experiments were then conducted to measure theuptake of metals by the zeolites. The zeolites were characterised using XRD and BET. TheSouth Africa clinoptilolite has a higher surface area and pore volume (17.52m2/g and0.047cm3/g respectively) than the USA zeolite (12.26m2/g and 0.028cm3/g respectively) forthe Na+ homoionic form. According to the equilibrium studies, the selectivity sequence canbe given as Pb2+ >Cd2 >Ni2+, with good fits being obtained using Langmuir and Freundlichadsorption isotherms for low metal concentrations as compared to higher concentrations. Theadsorption was found to depend on the homoionic form of the zeolite and to a lesser extentthe source of the zeolite. The selectivity of a particular zeolite for a particular heavy metalcan be altered by the homoionic form of the zeolite. Generally, the adsorption capacity of theUSA clinoptilolite is higher than the capacity of the RSA clinoptilolite revealing the potentialof clinoptilolite in industrial effluent treatment." @default.
- W133505415 created "2016-06-24" @default.
- W133505415 creator A5010077955 @default.
- W133505415 date "2012-02-14" @default.
- W133505415 modified "2023-09-27" @default.
- W133505415 title "Adsorption of cadmium, nickel and lead on modified natural zeolite" @default.
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