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| Adsorption of acid scarlet 3R by Ca/CTS/ FA composite from aqueous solution |
| Received:December 12, 2015 |
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| KeyWord:fly ash;chitosan ;composite material;acid scarlet 3R;adsorption |
| Author Name | Affiliation | E-mail | | HAN Shuang-yan | College of Chemical & Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China | | | LI Bei-gang | College of Chemical & Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China | libg@imnu.edu.cn |
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| Abstract: |
| Dye-containing wastewater has caused severe water pollution. In this study, a new adsorbent, Ca/CTS/ FA composite prepared by loading chitosan and calcium ion onto fly ash was used to remove acid scarlet 3R(AS 3R) from aqueous solution. The optimum adsorption conditions and adsorption properties were investigated. Adsorption kinetics and thermodynamics and recycling of the composite adsorbent were discussed. Results showed that solution pH, adsorbent rate, contact time and oscillation frequency all affected AS 3R adsorption. The adsorption process could be well described by pseudo-second-order kinetic equation(R2=1.00). The isotherm data were fitted the Langmuir, Freundlich and D-R models, with Langmuir model being better than others. The average adsorption energy obtained by D-R model, the apparent activation energy and thermodynamic results showed that AS 3R was adsorbed through chemisorption, physical adsorption and hydrogen bonding. The negative values of adsorption Gibbs free energy changes(ΔG) and the positive values of adsorption enthalpy changes(ΔH) indicated that the adsorption process of AS 3R had spontaneous and endothermic nature. The FA/CTS/Ca material could be regenerated by 0.01 mol·L-1 NaOH solution and reused at least 8 times for dye removal from aqueous solution. The regeneration rates were higher than 99%. |
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