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Kinetic Equilibrium and Adsorption Thermodynamics of Direct Dyes by Ca/CTS/FA Composite

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Abstract:

A novel composite material, calcium/chitosan/fly ash (Ca/CTS/FA) adsorbent prepared by adding a small amount of chitosan (CTS) and calcium ion(Ca) on fly ash (FA) was applied to the adsorption of three direct dyes including direct orange S (DO-S), direct green BE (DG-BE) and direct bordeaux BE (DB-BE). Adsorption equilibrium, isotherms and adsorption thermodynamics were studied . The results show that the adsorption rates of three direct dyes to Ca/CTS/FA are high and the adsorption equilibrium can be reached within 60 minutes. isothermal adsorption data agree with Langmuir model, and the saturated adsorption capacities are 1667mg/g for DO-S, 1111mg/g for DG-BE and 1111mg/g for DB-BE respectively at 298K. Dubinin-Radushkevich (D-R) model is used to investigate the adsorption behavior of direct dyes, and theaverage adsorption energy is in the range of 17.2 ~ 23.6kJ/mol at different temperatures. the thermodynamic parameters indicate that the adsorption processes of direct dyes to Ca/CTS/FA are spontaneous and endothermic from 298K to 328K. Characterization results by FT-IR indicate that Ca/CTS/FA composite is successfully prepared. As a low-value composite adsorbent, Ca/CTS/FA has very high adsorption capacity for direct dyes.

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Periodical:

Materials Science Forum (Volume 913)

Pages:

941-947

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.913.941

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Online since:

February 2018

Authors:

Bei Gang Li*, Li Wei Sun

Keywords:

Adsorption Thermodynamics, Calcium Ion, Chitosan, Direct Dyes, Fly Ash

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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