Macro-Reticular Ion Exchange Resins for Recovery of Direct Dyes from Spent Dyeing and Soaping Liquors.

Mona M Naim,Nouf F Al-Harby,Mervette El Batouti,Mahmoud M Elewa

doi:10.3390/molecules27051593

Abstract

Dyes are a major class of organic pollutants that are well-known for their harmful impact on aquatic life and humans. Several new strategies for removing colours from industrial and residential effluents have recently emerged, with adsorption being the best option. The current study looked at the recovery of direct dyes from aqueous streams for reuse using macro-reticular ion exchange resins (IERs). The investigation includes dyeing single jersey cotton grey textiles with direct dyes from the Isma dye Company in Kafr El Dawar, Egypt. After centrifuging and separating the supernatant liquid, solutions from thirteen different dyes, produced at an average concentration between the wasted and soaping liquor concentrations, were calculated spectrophotometrically from the first dyeing trials. Kinetic data were well fitted with pseudo-second-order rate kinetics. The amounts of dye retained by the anion exchangers increased with a rise in temperature in the case of Strong Base Resin (SBR) and vice versa for Weak Base Resin (WBR). Batch adsorption experiments with SBR and WBR were conducted for each dye, and both Freundlich and Langmuir isotherms were constructed. It was found that adsorption obeyed both isotherms, that monolayer adsorption took place, and that the dye molecular weight, structure, and solubility, as well as the type of anionic resin used, had varying effects on the extent of absorption. The monolayer sorption capacities Q0 determined from the Langmuir isotherm model for the strongly and weakly basic anion exchangers were found to be 537.6 and 692 mg/g for Direct Yellow RL, respectively. As a result, Yellow RL exhibited the greatest adsorption on both SBR and WBR. Orange GRLL, Blue 3B, and Congo Red, on the other hand, were the poorest colours absorbed by the IERs, whereas Blue RL demonstrated good adsorption by SBR and accelerated adsorption by WBR. Most of the dyes may be recovered and reused in this manner.

Highlights

Introduction iationsThe fast expansion in the global population and vast industrial operations has led global water demand to double every 21 years
Thirteen direct dyes were obtained from Isma dye Company in Kafr El Dawar, Egypt, and were not purified prior to use
The data for calibration curves and maximum absorbances 0.0559 for all direct dyes studied in the 0.9992 present work are presented in

Summary

Introduction

The fast expansion in the global population and vast industrial operations has led global water demand to double every 21 years. Water issues affect almost 80 nations, accounting for 40% of the world’s population. According to the United Nations, water scarcity might affect up to 2.7 billion people by 2025 [1,2]. Many countries have a scarcity of safe drinking water. Around 5–10 million people die as a result of illnesses caused by drinking dirty water [1]. Water pollution control has been recently one of the major areas of scientific activity [3] The assessment of the amount of dye in the waste stream is an important investigation to do before disposal since even a tiny amount of 1 mg/L can cause colour and an unacceptable concentration for ingestion

Methods

Results

Conclusion