Removal of Cu (II) and Pb (II) from aqueous solution using engineered iron oxide nanoparticles

Abstract

Nano-sized Fe3O4 and Fe2O3 were synthesized using a precipitation method. The nanomaterials were tested as adsorbents for the removal of both Cu2+ and Pb2+ ions. The nanomaterials were characterized using X-ray powder diffraction to determine both the phase and the average grain size of the synthesized nanomaterials. Batch pH studies were performed to determine the optimum binding pH for both the Cu2+ and Pb2+ to the synthesized nanomaterials. The optimum binding was observed to occur at pH 4 and above. Time dependency studies for Cu2+ and Pb2+ showed the binding occurred within the first five minutes of contact and remained constant up to 2 hours of contact. Isotherm studies were utilized to determine the binding capacity of each of the nanomaterials for Cu2+ and Pb2+. The binding capacity of Fe3O4 with Cu2+ and Pb2+ were 37.04 mg/g and 166.67 mg/g, respectively. The binding capacities of the Fe2O3 nanomaterials with Cu2+ and Pb2+ were determined to be 19.61 mg/g and 47.62 mg/g, respectively. In addition, interference studies showed no significant reduction in the binding of either Cu2+ or Pb2+ to the Fe3O4 or Fe2O3 nanomaterials in the presence of solutions containing the individual ions Na+, K+, Mg2+ and Ca2+ or a solution consisting of a combination of all the aforementioned cations in one solution.

Effective Amendments on Cadmium, Arsenic, Chromium and Lead Contaminated Paddy Soil for Rice Safety

“…The competition for adsorption sites through Fe and H ions, the formation of soluble complexes, high surface area, high CEC, and specific retention may have played a significant role in decreasing the availability of Cd, Pb, Cr, and As. The binding capacity of iron oxide towards heavy metals, including Cd, As, Cr, Pb, Cu, Co, and Ni, is well known and might be another factor that supports our results [45,48,56,57]. We know that Eh is also a very important factor in reducing the availability of metals and metalloids to rice plants.…”

Metal (Cd, Cr, Ni, Pb) removal from environmentally relevant waters using polyvinylpyrrolidone-coated magnetite nanoparticles

“…Cu, Cd) in synthetic and natural water. [43][44][45] In so water (Fig. 1A), at higher concentrations (10 and 100 mg L À1 ), the metal removal followed the trend that Cr < Ni < Cd < Pb, which was same as their ionic radius sequence.…”

Destruction of Cyanide and Removal of Copper from Waste Printed Circuit Boards Leach Solution Using Electro-Generated Hypochlorite Followed by Magnetite Adsorption

“…Alorro et al [24] showed that gold ions adsorbed on magnetite due to higher standard reduction potential of Au than the open circuit potential (OCP) of magnetite, and also observed that small amount of Cu adsorbed even though the standard reduction potential of Cu is lower than OCP of magnetite. Since the standard reduction potential of gold cyanide complex ions decreased to −0.3 V versus SHE from 1.1 V versus SHE in chloride solution [26][27][28], it was expected that the remaining cyanide ions would prevent Au adsorption on the magnetite, whereas a few amounts of copper ions could be adsorbed due to the pH and difference of solution media [29][30][31][32]. The remaining copper ions can have a detrimental effect on the purity of gold in an electrowinning process of gold [33].…”