No abstract

We have studied the dyeing kinetics of mercerized and mercerized and crosslinked cotton fabrics slack-mercerized with different alkalis. Regardless of whether or not the fabrics were treated with the crosslinking agent, the activation energies and the values of equilibrium adsorption for the various fabrics are ranked as follows: unmercenzed fabric > KOH mercerized fabric > NaOH mercerized fabric > LiOH mercerized fabric. However, the order of the rate constants and the structural diffusion resistance constants for the various cottons is LiOH mercerized fabric > NaOH mercerized fabric > KOH mercerized fabric > unmercerized fabric.

# Recoveiy of toxic metals from industrial wastewaters is an important environmentalissue. The use of liquid membrane technology has gained momentum in recent years as it allows the reuse of water and toxic metals. In this study, a bulk liquid membrane consisting of D2EHPA (ionic extractant) in n-hexane (solvent) was used to extract cadmium from an aqueous solution simulating industrial wastewater, and ammonium acetate solution was used to strip cadmium from the membrane phase. Initially, equilibrium and kinetics experiments were performed to identrfL favourable operating conditions as well as extraction and stripping rates. Then bulk liquid membrane experiments, with simultaneous extraction and stripping, were performed. More than 90% of the cadmium was recovered using the bulk liquid membrane in 120 minutes.