Abstract
The adsorption of the acid dye Acid Orange 8 (AO8) onto unmodified and modified zeolites from coal fly ash and bottom ash was evaluated. The coal fly ash and bottom ash used in the synthesis of the zeolites by alkaline hydrothermal treatment were collected in the Thermoelectric Complex Jorge Lacerda, located in the Santa Catarina State, Brazil, the largest coal burning thermoelectric complex of Latin America. The modified zeolites were modified using the surfactant hexadecyltrimethylammonium bromide. The zeolitic materials were characterized predominantly as hydroxysodalite and NaX. The kinetics studies indicated that the adsorption followed the pseudo-second order kinetics. Linear and non-linear regression methods were used to determine the best fit of equilibrium data. The Freundlich model was better adjusted to the experimental data for all systems studied. The parameters of adsorption isotherms were used to predict the design of the equipment for performing adsorption discontinuous single stage. DOI: http://dx.doi.org/10.17807/orbital.v7i4.764
Highlights
The textile industry worldwide plays an important role, both for its growth and the generation of waste
The X-ray diffractograms of unmodified zeolite, modified zeolite and modified zeolite saturated with dye obtained from coal fly ash and bottom ash are shown in Figures 2 and 3, respectively
The mineralogical composition of ash used as raw material for the synthesis of zeolites depends on the geological factors related to the formation and deposition of coal and its combustion conditions
Summary
The textile industry worldwide plays an important role, both for its growth and the generation of waste. It is a fragmented industry, and presents complex process and is considered one of the most polluting. A stage of the production of the textile industry involves spinning, weaving and/or knitting, processing and ennobling of yarns and fabrics and clothing. The steps that consume more water and generating the most effluents are the processing and ennobling. The synthetic dyes are complex compounds, which exhibit considerable structural diversity and are highly toxic. Naphthol, vat dyes, nitrates, acetic acid, surfactants, enzymes chromium compounds and metals such as copper, arsenic, lead, cadmium, mercury, nickel, cobalt and certain auxiliary chemicals [1, 2]
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