Removal of Copper, Nickel, and Zinc Ions from Electroplating Rinse Water

Abstract

Research Article Removal of Copper, Nickel, and Zinc Ions from Electroplating Rinse WaterRemoval of copper, nickel, and zinc ions from synthetic electroplating rinse water was investigated using cationic exchange resin (Ceralite IR 120). Batch ion exchange studies were carried out to optimize the various experimental parameters (such as contact time, pH, and dosage). Influence of co-existing cations, chelating agent EDTA on the removal of metal ion of interest was also studied. Sorption isotherm data obtained at different experimental conditions were fitted with Langmuir, Freundlich, RedlichPeterson, and Toth models. A maximum adsorption capacity of 164 mg g À1 for Cu(II), 109 mg g À1 for Ni(II), and 105 mg g À1 for Zn(II) was observed at optimum experimental conditions according to Langmuir model. The kinetic data for metal ions adsorption process follows pseudo second-order. Presence of EDTA and co-ions markedly alters the metal ion removal. Continuous column ion exchange experiments were also conducted. The breakeven point of the column was obtained after recovering effectively several liters of rinse water. The treated rinse water could be recycled in rinsing operations. The Thomas and Adams-Bohart models were applied to column studies and the constants were evaluated. Desorption of the adsorbed metal ions from the resin column was studied by conducting a model experiments with Cu(II) ions loaded ion exchange resin column using sulfuric acid as eluant. A novel lead oxide coated Ti substrate dimensionally stable (DSA) anode was prepared for recovery of copper ions as metal foil from regenerated liquor by electro winning at different current densities (50-300 A cm À2 ).

Adsorption of copper and zinc onto natural clay in single and binary systems

“…In this regards, multiple researchers studied the effectiveness of various type of clay in removing heavy metals from aqueous solutions including kaolinite (Sari et al 2007;Schaller et al 2009), bentonite (Ulmanu et al 2003;Kaya and Hakan Ö ren 2005;Eren et al 2009), illite (Ozdes et al 2011), sepiolite (Guerra et al 2010), montmorillonite (Lin and Juang 2002), and other adsorbents (Al-Degs et al 2006;Engates and Shipley 2011). Many other studies have been undertaken to evaluate the adsorptive capacity of various bioadsorbents in the removal of inorganic pollutants (Ahmad et al 2010;Das 2012;Dubey and Shiwani 2012;Revathi et al 2012;Eren 2010). They found that those cheap adsorbents could be used in the removal of different metal cations [e.g., Cd(II), Pb(II), Cu(II), Zn(II) … etc.].…”

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

“…üzerindeki doz artışının adsorpsiyon yüzdesinde belirgin değişikliğe sebep olmadığı gözlenmiştir. Çünkü adsorban dozunun artması adsorpsiyonun gerçekleştiği yüzey alanının ve adsorplama bölgelerinin artması anlamına gelmektedir [16]. Bu sebeple adsorplama yüzdesi artış göstermektedir, fakat adsorbanın gramı başına adsorplanan Zn(II) miktarı çözeltideki Zn(II) miktarının sabit olması nedeniyle azalmaktadır.…”

Treatment influence on green coconut shells for removal of metal ions: pilot-scale fixed-bed column

“…Because of its mobility, metal ions are very difficult to trace when they are introduced into the ecosystem, and the ultimate destination of these metal ion species is frequently unknown. [1][2][3] Among the processes for removing toxic metals from aqueous effluents are chemical precipitation, flocculation, carbon adsorption, ion exchange, reverse osmosis and electrodialysis. [3][4][5][6][7] These methods present disadvantages, including high cost or production of sludge with a high metal concentration which is difficult to dispose of.…”