Sorptive Removal of 4-Aminophenol from Water Using a Polymeric Sorbent

aminophenol;sorption;adsorption;absorption;PEBA;regeneration;NaCl;sodium chloride;4-aminophenol;Langmuir;Freundlich;isotherm;kinetics

Celarek, Michaeladvisor:Xianshe, Feng ; affiliation1:Faculty of Engineering ; Xianshe, Feng ;

University of Waterloo

关键词: adsorption;    isotherm;    Master Thesis;    absorption;    regeneration;    aminophenol;    sorption;    PEBA;    4-aminophenol;    Freundlich;    Langmuir;    NaCl;    kinetics;    sodium chloride;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/12493/3/Celarek_Michael.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

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.