Successive extraction of As(V), Cu(II) and P(V) ions from water using spent coffee powder as renewable bioadsorbents

Abstract

For the first time, renewable and easy accessible pre-bleached spent coffee powder coated with polyethylenimine (PEI) and ferric ions (Coffee-PEI-Fe) was used for the successive adsorption of As(V), Cu(II) and P(V) ions from spiked water samples. Fully characterized coffee-PEI-Fe was employed for batch mode experiments. Kinetic regression analysis showed that the adsorption processes of As(V) and P(V) anions follows a pseudo-second-order model, while the adsorption of Cu(II) ions fit with a pseudo-first-order model. The maximum adsorption capacities estimated by Langmuir model for As(V), Cu(II) and P(V) ions were 83.3, 200.1, and 50.2 mg/g, respectively. The simulated results revealed that the internal diffusion is the rate-determining step for the adsorptions of As(V) and Cu(II) ions, while film diffusion is the mass transfer resistance for the adsorption of P(V) ions on the surface of coffee-PEI-Fe. The successive adsorptions of adsorbates were achieved through electrostatic attraction between adsorbent surface and adsorbates. The dynamic column adsorption behavior of the adsorbent was described by Thomas model, which showed a good agreement with the experimental values (qexp). The results presented in this paper could be used for developing efficient adsorbent from renewable materials for water purification.

Extending the geographic reach of the water hyacinth plant in removal of heavy metals from a temperate Northern Hemisphere river

“…Diverse methods are being developed for water remediation, including use of plant biomass 18 – 20 . Work by Rezania (2015) and others have reported the potential of water hyacinth in the removal of pollutants from an aqueous solution 21 – 23 .…”

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Super Effective Removal of Toxic Metals Water Pollutants Using Multi Functionalized Polyacrylonitrile and Arabic Gum Grafts

“…where K 2 (g/mg min) is the equilibrium rate constant for the pseudo second-order adsorption, whereas q e can be calculated from the plot of t/q t against t (Figure 8b) [42]. A comparison of the results with the correlation coefficients for the first and second order models is listed in Table 3.…”

“…The third portion is the final equilibrium stage, where the adsorbate has extremely low concentrations in the solution due to the slowing down of intraparticle diffusion.   (5) where K2 (g/mg min) is the equilibrium rate constant for the pseudo second-order adsorption, whereas qe can be calculated from the plot of t/qt against t (Figure 8b) [42]. A comparison of the results with the correlation coefficients for the first and second order models is listed in Table 3.…”