Adsorption of Copper Cyanide on Chemically Active Adsorbents

Abstract

An inorganic chemically active adsorbent (ICAA), SG(1)-TEPA (tetraethylenepentaamine)-propyl, is developed for removal, recovery, and recycling of copper cyanide from industrial waste streams. Equilibrium studies are executed to determine and model adsorption of the copper cyanide complex from aqueous solutions in a batch and packed column. It appears that adsorption is dependent on anionic copper cyanide species and the basicity of the ligand. Aqueous-phase equilibrium modeling shows that monovalent (Cu(CN)2 -), divalent (Cu(CN)3 2-), and trivalent (Cu(CN)4 3-) species of copper cyanide exist in the solution, depending on the pH and the concentration of total cyanide ions. Batch adsorption data are modeled using a modified multicomponent Langmuir isotherm which includes aqueous-phase speciation and basicity of the SG(1)-TEPA-propyl. This developed model is applied with a mass balance equation to describe the adsorption of copper cyanide complexes in a packed column.

Synthesis and Characterization of Periodic Mesoporous Organosilicas as Anion Exchange Resins for Perrhenate Adsorption

“…Organic polymer anion exchange resins are widely used to recover and remediate anions from various process waste streams . However, the drawbacks associated with all organic polymer anion exchange resins are (i) instability in harsh chemical environments, such as organic solvents and oxidizing agents; (ii) limited surface areas; (iii) thermal instability; and (iv) swelling in contact with solvents. , Because of these shortcomings, organic−inorganic hybrid anion exchange resins have been developed as effective adsorbents for copper cyanide, chromate, and arsenate, as well as potentiometric sensors for anions 3,6 and chemosensors for anions . We are interested in the development of new anion exchange resins and have successfully developed mesoporous organic−inorganic anion exchange hybrid resins for the adsorption of anionic thorium nitrate complexes in nitric acid solutions 2 and for the adsorption of perrhenate ions in aqueous solutions …”

Synthesis and Characterization of Organic−Inorganic Hybrid Mesoporous Anion-Exchange Resins for Perrhenate (ReO4-) Anion Adsorption

“…Among the various organic anion-exchange resins, quaternary ammonium resins are one of the most popular and effective in these applications . However, drawbacks are associated with all organic anion-exchange resins: (1) instability in harsh chemical environments such as organic solvents and oxidizing agents, (2) limited surface areas, (3) hydrophobicity of polymer backbones, (4) thermal instability, and (5) swelling and deformation in contact with solvents. , For these reasons, organic−inorganic hybrid resins have been developed as sorbents for anionic copper cyanide complexes, potentiometric sensors for anions, , and chemosensors for anions . Mesoporous silica materials functionalized with Cu-chelated complexes 7 and amine ligands 8 have also been prepared for the adsorption of arsenate and chromate in aqueous solution.…”

Recovery of Copper from Effluents by Cementation on Aluminum in a Multirotating Cylinder-Agitated Vessel

“…[1] Due to its cost, it is incentive to recover it from waste solutions. There are many technologies involving chemical and physical processes which have been developed over the past years to remove hazardous metal ions, such as chemical precipitation, [2,3] adsorption, [4][5][6][7][8][9][10][11][12] ion exchange, [13,14] electrochemical technique, [15][16][17] , and membrane processes, [18][19][20] ; however, all of them have drawbacks. Chemical precipitation requires extremely long settling time and produces a large amount of sludge; ion exchange and adsorption are expensive and require frequent regeneration; and membrane processes suffer from operational problems due to fouling of membranes which can be reduced by several approaches, e.g., by feed pretreatment and treatment of the membrane surface.…”