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Adsorption of methylene blue from an aqueous solution using a cucurbituril polymer
Author(s) -
Chen Ruihuan,
Qiao Hongtao,
Liu Yun,
Dong Yuanhua,
Wang Ping,
Zhang Zehuan,
Jin Tao
Publication year - 2014
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12029
Subject(s) - freundlich equation , adsorption , chemistry , langmuir , aqueous solution , cucurbituril , ionic strength , diffusion , methylene blue , chromatography , organic chemistry , thermodynamics , molecule , supramolecular chemistry , physics , photocatalysis , catalysis
This article presents a study on the batch adsorption of methylene blue (MB) in an aqueous solution onto a cucurbituril polymer (CP) in order to explore its potential use as an adsorbent for dye removal from wastewater. Equilibrium studies showed that MB had a high affinity in a basic medium, but decreased as solution pH decreased. The adsorption of MB decreased with an increase in ionic strength for all four types of cations (Na + , K + , Mg 2+ , and Ca 2+ ). The pseudo first‐order, pseudo second‐order kinetic model, and the intraparticle diffusion model were used to fit the kinetics process of MB adsorption on the CP. The result implies that the pseudo second‐order model provided a high degree of correlation with the experimental data, and intraparticle diffusion is not the only rate‐limiting step. The experimental isotherm data were analyzed using the Langmuir, Freundlich, and Redlich–Peterson isotherm model at initial pH 5.6 and 11. Five error analysis methods were used to evaluate the data. The error values indicated that the Redlich–Peterson and Langmuir models could provide the better quality of fit at initial pH 5.6, and Redlich–Peterson and Freundlich models described better the MB adsorption data at initial pH 11.0. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 512–519, 2015