Fe/CTS/AFA复合材料对染料的高效吸附

doi:10.11896/j.issn.1005-023X.2018.10.007

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Abstract Fe/CTS/AFA composite, prepared by the high-temperature calcination of fly ash (the activated FA, AFA) and the reaction solution with a small amount of Fe(Ⅲ) and chitosan (CTS), was used for the adsorption of Reactive turquoise blue KN-G (RTB KN-G) and Direct sky blue 5B (DSB 5B) dyes from aqueous solutions. The adsorption property of the composite was discussed by studying main factors affecting the adsorption, dynamics, thermodynamics and structural analysis of FT-IR. The results revealed that the adsorbent performance was strongly dependent on the solution pH. Fe/CTS/AFA composite had excellent adsorption performance for RTB KN-G and DSB 5B with the adsorption amounts of 906 mg/g and 635 mg/g under the conditions of the dosage of 0.1 g at 25 ℃ and solution pH of 2.0, which were 31.6 and 15.3 times those of FA, respectively. The adsorption equilibrium can be achieved in 60 min. The adsorption processes for two dyes can be accurately described by the pseudo-second-order adsorption model. Isothermal adsorption data completely accorded with the Langmuir model. Thermodynamic parameters, negative value of Gibbs free energy changes and positive values of enthalpy changes and entropy changes, illustrated that the adsorption of DSB 5B by Fe/CTS/AFA was spontaneous and endothermic nature accompanied by decreasing in order on the liquid-solid interface. Fe/CTS/AFA adsorbent saturated by RTB KN-G dye can be regenerated by 0.01mol/L NaOH solution, and reused 3 times for dye removal from the wastewater. According to the activation energy values obtained by Arrhenius equation and the effect of temperature on the adsorption, it can be inferred that the adsorption was mainly electrostatic and physical action. FT-IR structure analysis demostrated that Fe/CTS/AFA had been successfully prepared and can be used for the effective purification of high-concentration dye wastewater.

Key words： fly ash chitosan iron(Ⅲ) composite material dyes adsorption

Published: 25 May 2018 Online: 2018-07-06

CLC number:

X705

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	LI Beigang
	WANG Min

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LI Beigang,WANG Min. High Efficient Adsorption of Dyes by Fe/CTS/AFA Composite[J]. Materials Reports, 2018, 32(10): 1606-1611.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.10.007 OR https://www.mater-rep.com/EN/Y2018/V32/I10/1606

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