A novel cellulose-dioctyl phthate-baker's yeast biosorbent for removal of Co(II), Cu(II), Cd(II), Hg(II) and Pb(II)

Abstract

In this work, dioctyl phthalate (Dop) was used as a highly plasticizing material to coat and link the surface of basic cellulose (Cel) with baker's yeast for the formation of a novel modified cellulose biosorbent (Cel-Dop-Yst). Characterization was accomplished by Fourier Transform Infrared Spectroscopy (FT-IR), Thermogravimetric analysis (TGA) and Scanning Electron Microscope (SEM) measurements. The feasibility of using Cel-Dop-Yst biosorbent as an efficient material for removal of Co(II), Cu(II), Cd(II), Hg(II) and Pb(II) ions was explored using the batch equilibrium technique along with various experimental controlling parameters. The optimum pH values for removal of these metal ions were characterized in the range of 5.0-7.0. Cel-Dop-Yst was identified as a highly selective biosorbent for removal of the selected divalent metal ions. The Cel-Dop-Yst biosorbent was successfully implemented in treatment and removal of these divalent metal ions from industrial wastewater, sea water and drinking water samples using a multistage microcolumn technique.

Preparation, Characterization, and Application of Manganese Oxide Coated Zeolite as Adsorbent for Removal of Copper(II) Ions from Seawater

“…The effect of pH on the adsorption of Cu(II) on CA, CA-NMO, g-CA-EN-NMO, g-CA-DETA-NMO, g-CA-TETA-NMO and g-CA-TEPA-NMO at 25˚C mainly depends on the surface charge of the adsorbents as well as their functional groups (Figure 4). The adsorption capacity is gradually increased as the solution pH increased and reached their maximum values at pH 7 [36] [37]. At low pH values (1-5), the surface of adsorbents would be surrounded by high concentration of hydronium ions and the functional groups responsible for binding with heavy metal were protonated, so this decrease interaction of the metal ions with binding sites of the adsorbents.…”

“…Effect of sorbent dosage The removal of Cu(II) was studied by varying the sorbent dose of different sorbents (5 -250 mg) in aqueous system at pH = 7 and 25˚C as shown in ( Figure 6). Increasing sorbent mass the surface area increase as well as greater number of active binding sites and the percentages of extracted Cu(II) ions increase [37]. The percentage removal of Cu(II) by different sorbents were found to increase with increasing sorbent dose.…”