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Title: Chain length and acidity of carboxylic acids influencing adsorption/desorption mechanism and kinetics over anion exchange membrane
Authors: Chandra A.
Chattopadhyay, Sujay
Published in: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Abstract: Selective recovery of carboxylic acids through anion exchange membrane (AEM) during electrodialysis (ED) involves bulk transport/diffusion/adsorption/desorption steps. Combined effect of size, structure, percentage dissociation, interactions alter each step of transport. In this study, we focused on interpretation of role of functional groups (number of [sbnd]COOH groups) and hydrocarbon chain length of different carboxylic acids (formic (FA), acetic (AA), propionic (PA), butyric (BA), malic (MA) and citric (CA) acids) during their transport in terms of ion interaction with membrane. Quantitative estimate of interactions between acids – AEM, adsorption mechanism and solute uptake rate were inferred from adsorption isotherms (Langmuir, Freundlich and Redlich-Peterson) and kinetic models (pseudo-first-order, pseudo-second-order and Elovich). Adsorption was rate limiting and Freundlich isotherm was more appropriate. Adsorption capacities, Kf followed an order: 0.139 > 0.121 > 0.072 > 0.062 > 0.049 > 0.025 mmol·g−1 respectively with CA, MA, FA, AA, PA, BA. Pseudo-second order rate constants, k2 followed same order of adsorption, highest with CA (0.0187 g·mmol−1 min−1) and lowest with BA (0.0124 g·mmol−1 min−1) and dominance of heterogeneous mode of chemical/ionic interactions. pKa, chain length and molecular sieve effects were used to support the adsorption pattern. © 2019 Elsevier B.V.
Citation: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 589
Issue Date: 2020
Publisher: Elsevier B.V.
Keywords: Adsorption isotherms
Carboxylic acids
Chemical structure
ISSN: 9277757
Author Scopus IDs: 56956297900
Author Affiliations: Chandra, A., Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India, Department of Chemical Engineering, Vignan's Foundation for Science, Technology and Research (Deemed to be University), Vadlamudi, Guntur, Andhra Pradesh 522213, India
Chattopadhyay, S., Department of Polymer and Process Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
Funding Details: Financial support to execute the experimental work is gratefully acknowledged to Indian Institute of Technology Roorkee (No. IITR/SRIC/244/FIG-Sch-A ), India. and Uchchatar Avishkar Yojana (UAY) project ( ICSR/UAY/2016/SN dt.04/01/2017 ), India. ICSR/UAY/2016/SN dt.04/01/2017; Indian Institute of Technology Roorkee, IITR: IITR/SRIC/244/FIG-Sch-A
Corresponding Author: Chattopadhyay, S.; Department of Polymer and Process Engineering, India; email:
Appears in Collections:Journal Publications [PE]

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