Adsorption Equilibrium for Heavy Metal Divalent Ions (Cu²⁺, Zn²⁺, and Cd²⁺) into Zirconium-Based Ferromagnetic Sorbent

Abstract

Zirconium-based ferromagnetic sorbent was fabricated by coprecipitation of Fe2+/Fe3+ salts in a zirconium solution and explored as a potential sorbent for removing the Cu2+, Zn2+, and Cd2+ from aqueous solution. The sorbent could easily be separated from aqueous solution under the influence of external magnetic field due to the ferromagnetism property. A trimodal distribution was obtained for the sorbent with average particle size of 22.74 μm. The –OH functional groups played an important role for efficient removal of divalent ions. The surface of the sorbent was rough with abundant protuberance while the existence of divalent ions on the sorbent surface after the sorption process was demonstrated. Decontamination of the heavy metal ions was studied as a function of initial metal ions concentration and solution pH. Uptake of the heavy metal ions showed a pH-dependent profile with maximum sorption at around pH 5. The presence of the ferromagnetic sorbent in solution at different initial pH has shown a buffering effect. Equilibrium isotherms were analyzed using Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. Adequacy of fit for the isotherm models based on evaluation of R2 and ARE has revealed that heavy metal ions decontamination was fitted well with the Freundlich model.

Using Pomegranate Peel and Date Pit Activated Carbon for the Removal of Cadmium and Lead Ions from Aqueous Solution

“…With increasing pH, the hydrous oxides were deprotonated in addition to the decrease of the positive charges, so the sorption sites become available and the adsorption of metal ions increases [44,45], and at very high pH values (>8), the metal ions precipitated (Figure 6).…”

Inertização de zinco presente em resíduo perigoso por meio do uso de produtos industriais

“…É conhecido que as reações de precipitação, complexação e adsorção de metais pesados são favorecidas pela elevação de pH (SPOSITO, 2008;LEE et al, 2017), assim como a diminuição da acidez do sistema solo-resíduo alcalino pode favorecer a transformação de Zn nas formas mais solúveis para as de menor solubilidade. Os metais pesados apresentam maior solubilidade em condições de acidez, e aumentos do pH do solo reduzem a sua disponibilidade para as plantas (BORGES & COUTINHO, 2004;LEE et al, 2017).…”

“…É conhecido que as reações de precipitação, complexação e adsorção de metais pesados são favorecidas pela elevação de pH (SPOSITO, 2008;LEE et al, 2017), assim como a diminuição da acidez do sistema solo-resíduo alcalino pode favorecer a transformação de Zn nas formas mais solúveis para as de menor solubilidade. Os metais pesados apresentam maior solubilidade em condições de acidez, e aumentos do pH do solo reduzem a sua disponibilidade para as plantas (BORGES & COUTINHO, 2004;LEE et al, 2017). Estudos demonstraram que a adsorção específica do Zn pelos minerais do solo aumenta com o pH (ANDRADE et al, 2007;SANTOS, 2005;BORGES JUNIOR et al, 2008;UDDIN, 2017;KWON et al, 2017), o que indicaria uma eficiência na redução da solubilidade do Zn presente no Resíduo Ingá.…”

Synthesis and Characterization of Alginate Encapsulated Zirconium-Based Ferromagnetic Sorbent for Adsorptive Removal of Dyes

“…Both of the particles were instantly attracted to a permanent magnet. Once magnetized, the particles interact magnetically like small permanent magnets by forming aggregates [9]. The mean diameter of the zirconium-based ferromagnetic particles is 34.98 μm.…”