Kinetics and thermodynamic studies of Methyl Orange removal by polyvinylidene fl

本文刊于: 《Journal of Environmental Sciences》 2021年第0期

关键词:
Electrospinning Compositemats Pedot Pvdf

Keywords:
Electrospinning,Composite mats,Pedot,Pvdf mats,Dye removal,Water remediation
摘要
     We report the preparation of poly(3,4-ethylene dioxythiophene)(PEDOT)-modified polyvinylidene fluoride electrospun fibers and their use as a novel adsorbent material for the removal of the anionic dye Methyl Orange(MO) from aqueous media. This novel adsorbent material can be used to selectively remove MO on a wide p H range(3.0–10.0), with a maximum capacity of 143.8 mg/g at p H 3.0. When used in a recirculating filtration system, the maximum absorption capacity was reached in a shorter time(20 min) than that observed for batch mode experiments(360 min). Based on the analyses of the kinetics and adsorption isotherm data, one can conclude that the predominant mechanism of interaction between the membrane and the dissolved dye molecules is electrostatic. Besides, considering the estimated values for the Gibbs energy, and entropy and enthalpy changes, it was established that the adsorption process is spontaneous and occurs in an endothermic manner. The good mechanical and environmental stability of these membranes allowed their use in at least 20 consecutive adsorption/desorption cycles, without significant loss of their characteristics. We suggest that the physical-chemical characteristics of PEDOT make these hybrid mats a promising adsorbent material for use in water remediation protocols and effluent treatment systems.

基金项目:
supportedbytheBrazilianagenciesCNPq,FUNASA,FACEPE,INFOInstitute,andELINORNanobiotechnologynetwork;RJSthanksCNPqforaPh.D.fellowship;thefinancialsupportfromtheMexicanagencyCONACyT

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