Wool micro powder as a metal ion exchanger for the removal of copper and zinc

Abstract

A B S T R A C TWaste wool fibers (WF) were oxidized and ball milled to enhance the exchanging ability toward some metal ions, namely copper and zinc. Wool fibers were oxidized with hydrogen peroxide and tetra acetyl ethylene diamine, followed by grinding process. Optimization of the exchanging medium with regard to the metal ion concentration, pH, and exchanging time was performed. It was observed that the ability of the wool powder (WP) and oxidized wool powder (OWP) to exchange greater amount of metal ions than the ordinary waste wool fibers. Mostly, current results verify a significant ability of the OWP to exchange copper and zinc ions from their aqueous medium. Nevertheless, the ability of all wool substrates used to exchange copper is more than their ability to exchange zinc, and as the pH of the exchanging medium increases, the uptake % of both copper and zinc ions by WF or WP increases to reach its maximum at pH 6. The efficiency of WF, WP, or OWP to adsorb copper and zinc ions after a number of adsorption/desorption tests was also studied.

Modification of waste wool fiber as low cost adsorbent for the removal of methylene blue from aqueous solution

“…The total milling time was adjusted for 8 hours after each 10 min takes a rest for 5 min and start in a reverse direction [20].…”

“…The presence of functional groups (such as NH2, CONH 2 ,COOH,and OH) in the wool [18,20] makes ita promising sorbent. These groups render wool high binding capacity toward metal ions [20,23,24] and dyes [25,26]. In addition, grinding wool into fine powder enhances the wool binding capacity owing to anenormous increase in the specificsurface area, meanwhile, keeping the original features of the wool unchanged [18,20,27].…”

“…Further enhancement in the wool binding capacity might be attained by chemical modification. It worth noting that the oxidation of wool using a mixture of hydrogen peroxide and Tetraacetylethylenediamine (TAED) improved the wool exchange-ability toward copper and zinc [20].…”

“…Nowadays, studies are focused on utilizing agricultural and industrial wastes as adsorbents for dye removaldue to their Waste wool fibers are amply available in Egypt. Utilizing this waste as adsorbent material could cut the cost of adsorption process and provide a solution for waste management [16][17][18][19][20][21][22]. The presence of functional groups (such as NH2, CONH 2 ,COOH,and OH) in the wool [18,20] makes ita promising sorbent.…”

“…Utilizing this waste as adsorbent material could cut the cost of adsorption process and provide a solution for waste management [16][17][18][19][20][21][22]. The presence of functional groups (such as NH2, CONH 2 ,COOH,and OH) in the wool [18,20] makes ita promising sorbent. These groups render wool high binding capacity toward metal ions [20,23,24] and dyes [25,26].…”