Recovery of gold by chicken egg shell membrane-conjugated chitosan beads

Abstract

We have successfully prepared a bead-type adsorbent from two materials with different adsorption characteristics. Heavy metals were removed by greatly swollen egg shell membrane-conjugated chitosan beads. The egg shell membrane accumulated and removed precious metal ions from a dilute aqueous solution with a high affinity in a short contact time. Experiments suggested that chitosan beads could take up gold ions with great capacity and selectivity by conjugation with egg shell membrane. Under certain conditions, the selective removal of gold and copper in a mixture of gold and copper ions by egg shell membraneconjugated chitosan beads was 100% and 2%, respectively. Egg shell membrane-conjugated chitosan beads can be seen as a promising material to recover gold in wastewater from various industries, such as electroplating.Key words Chitosan beads · Egg shell membrane · Heavy and precious metal · Selective recovery for metal

Alternative Low-cost Adsorbent for Water and Wastewater Decontamination Derived from Eggshell Waste: An Overview

“…These experiments suggested that ESM could be promising to use for the purpose of removal and/or recovery of metals and water pollution control. Based on this study, Shoji and colleagues have successfully prepared a bead-type adsorbent from greatly swollen eggshell membrane-conjugated chitosan beads [133]. Competitive adsorption experiments have been performed in mixed solutions containing various metal ions.…”

Water soluble blue-emitting AuAg alloy nanoparticles and fluorescent solid platforms for removal of dyes from water

“…22,23 The ESM can also act as a platform to retrieve heavy toxic metal ions, such as arsenic and mercury, from water. 24 Here, we demonstrate the simultaneous in situ reduction of Au and Ag ions by ESM resulting in the formation of highly uorescent AuAg alloy nanoparticles and metal ion immobilized uorescent solid ESM platforms. In addition, we also demonstrate the unique dyeadsorbing capability of these metal ion immobilized ESM platforms for the efficient removal of anionic dyes from waste water at room temperature.…”

Dielectric Properties of Eggshell Membrane of Some Select Bird Species

“…Eggshell is seldom used as a source of calcium. Research reports have it that eggshell membrane can be used as a support for bacteria culturing [14], split-thickness graft donor site dressing due to its antiinflammatory properties [15], pain relieving [16], wound protection [17], healing process in mammalian tissues damaged as a result of burns, ulceration, cuts and injuries [18] as well as removal of heavy metals and gold from industrial waste discharge [19].…”