Sorptive Removal of 4-Aminophenol from Water Using a Polymeric Sorbent
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Date
2017-09-27
Authors
Celarek, Michael
Advisor
Xianshe, Feng
Journal Title
Journal ISSN
Volume Title
Publisher
University of Waterloo
Abstract
This study deals with isotherm, kinetics and mechanistic studies pertaining to the sorption of 4-aminophenol from water using poly(ether-block-amide) (PEBA). A combined Langmuir and Freundlich isotherm model is used to fit the sorption isotherm data which forms an S3 type curve. The sorption follows pseudo-second order kinetics and the rate constant was determined using the original as well as the modified pseudo-second order models accounting for the instantaneous solute concentrations during the course of sorption. Diffusion was found to take place during sorption but it works alongside a secondary mechanism once higher concentrations (>100 ppm) are reached. The activation energy for sorption is calculated with both pseudo-second order (52.2 kJ/mol) and internal diffusion (54.0 kJ/mol) models. Presence of electrolytes in the system increases the sorption uptake of 50 ppm 4-aminophenol in PEBA by 20% to 100% at 0.25 wt% to 2.0 wt% NaCl respectively. The PEBA sorbent can be regenerated. Regeneration of the PEBA sorbent is highly effective with water, and even more effective with 99% isopropanol which confirms its reuse.
Description
Keywords
aminophenol, sorption, adsorption, absorption, PEBA, regeneration, NaCl, sodium chloride, 4-aminophenol, Langmuir, Freundlich, isotherm, kinetics