Adsorptive property of cationic dye crystal violet onto walnut shell

doi:10.3969/j.issn.1000-1565.2018.03.005

Abstract

Abstract: In order to develop efficient and low-cost treatment technique for dye waste water and promote the resource utilization of walnut shell, the adsorption kinetic and thermodynamic characteristics of the walnut shell for dyes in water were studied by static adsorption experiments. The results showed that the walnut shell particles contained negatively charge under pH 2-11. The electrostatic attractive force between the cationic dyes and the adsorbent could result in high adsorption capacity of walnut shell to cationic dyes. The adsorption thermodynamic characteristics could be better described by the Langmuir model, and the maximal adsorption capacity increased with increasing the temperature.The results of D-R model showed the adsorption was a chemical process. The kinetic data was fitted well to pseudo second-order model. The adsoption was mainly controlled by intraparticle diffusion but that was not the only rate-controlling step. ΔG<0,ΔH>0 and ΔS>0 indicated that the adsorption system was spontaneous and endothermic,thus the adsorption processes were favorable at higher temperature.

Key words: walnut shell, biosorption, crystal violet, kinetics, adsorption model

CLC Number:

X703.1

TANG Ranxiao,LI Yan,FAN Shengnan,SHANG Honglin,WANG Chun,ZHAO Ying. Adsorptive property of cationic dye crystal violet onto walnut shell[J]. Journal of Hebei University (Natural Science Edition), 2018, 38(3): 254-261.

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