Selective Removal of Copper(II) and Nickel(II) from Aqueous Solution Using the Chemically Treated Chitosan: Factorial Design Evaluation

Abstract

In the present work, the adsorption of Cu(II) and Ni(II) ions from their mixture solution by raw and chemically modified chitosan has been studied. The full factorial design methodology was employed to reduce the total number of experiments. Analysis of variance and student's t-test have been performed for Ni(II) and Cu(II) removal efficiency and for the ratio of their removal. The two main factors considered were pH of solution (at two levels 2.8 and 4.8) and contact time (at two levels: 20 minutes and 18 hours). The third factor was a qualitative factor at two levels (raw chitosan and chemically modified chitosan). Among the factors studied, chemical modification of chitosan was the most effective factor for the ratio of nickel and copper removal efficiency. It was found that pH has no significant effect on Ni(II) uptake. The result from this study indicates that the adsorption selectivity of chitosan can be enhanced by chemical treatment and regulating pH and contact time.

Selective Isolation of Trypsin Inhibitor and Lectin from Soybean Whey by Chitosan/Tripolyphosphate/Genipin Co-Crosslinked Beads

“…It is often used as an adsorbent for protein, dye, metal, lipid etc. [ 20 , 21 , 22 , 23 , 24 , 25 ]. The amino, hydroxyl, and N -acetyl reactive groups on chitosan structure could interact with adsorbates by electrostatic interaction, hydrogen bonding and hydrophobic interaction.…”

“…Furthermore, Montilla et al [ 22 ] recovered 90% β-LG with a protein purity of 95% by adjusting the pH of the β-LG-chitosan complex solution to 9. Sepehran et al [ 23 ] reported that raw and formaldehyde modified chitosan can selectively adsorb Cu 2+ and Ni 2+ ions from their mixture solution. The adsorption selectivity of chitosan can be enhanced by chemical treatment and regulating pH and contact time.…”

Adsorpsi Ion Logam Nikel(II) oleh Kitosan Termodifikasi Tripolifosfat

“…Berdasarkan grafik tersebut dimungkinkan bahwa pada waktu 5 jam, kondisi adsorpsi sudah mencapai kesetimbangan dan merupakan waktu kontak minimal dalam aplikasi adsorpsi terhadap ion logam Ni(II) oleh kitosantripolifosfat. Semakin lama waktu kontak antara adsorben dengan adsorbat, maka semakin banyak molekul adsorbat yang teradsorpsi hingga mencapai kondisi maksimum adsorben [14].…”

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.…”