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Abstract
The removal performance of highly colored soluble organic
pollutants in water has been investigated. Comparative adsorption studies
of some anionic dyes on commercially zeolite X and zeolite X powder
prepared from Egyptian kaolin have been studied. Brilliant blue FCF
(BL), brilliant black PN (BB), eriochrome black T (EBT) and ponceau 3R
(P3R) were introduced as models for organic pollutants of different
structures. For comparison, the properties of the synthetic zeolite and
commercial grade zeolite, such as elemental analysis, thermal stability
and cation exchange capacity using XRD, DSC and atomic absorption
spectroscopy, respectively were conducted. UV/visible spectroscopic
measurements have been used to determine the amount of adsorbed dyes
by zeolites. The adsorption capacities for batch method as well as fixed
bed reactor method were recorded. The influential parameters, such as
initial pH value of the solution, temperature, adsorbate concentration and ion exchange on the adsorption process were studied. The suitability of Langmuir and Freundlich isotherms to the equilibrium data was investigated in the solid-liquid system. In all the adsorption experiments,
the variation of adsorption capacities were recorded and explained III
terms of both zeolite behaviour and dyes structures. Attempts to regenerate the adsorbents physically (at high temperature) were also made and the adsorptive properties of the recovered zeolite have been provided.