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Adsorptive removal of toxic chromate and phosphate ions from polluted water using green-synthesized nanometal (Mn-Al–Fe) oxide

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Abstract

Synthesizing nanomixed metal oxides via green routes and adopting them as adsorbents in water remediation methods is an important aspect of chemical research. In the present investigation, nanoparticles of mixed oxides of Mn-Al–Fe of size 6.19 nm are successfully synthesized adopting ‘aloe vera gel’ as cap** agent and homogenous precipitation method for generating the precipitant (OH−) by urea hydrolysis, in a viscous mother liquor of composition: ‘glycerol:water (20:80)’. These nanoparticles are immobilized in Ca-alginate beads to prevent agglomeration. The mixed nanoparticles and beads are characterized and investigated for their sorption nature towards toxic chromate and phosphate ions. The adsorption mechanism is investigated by thermodynamic studies, isothermal and kinetic models. It is observed that chromate and phosphate can be simultaneously removed from waste water with the nanomixed metal oxides and beads at pH 7 and 10 respectively. The sorption capacities are 71.8 mg/g for phosphate and 87.3 mg/g for chromate with nanomixed metal oxides and 94.3 mg/g for phosphate and 109.8 mg/g for chromate with beads. The bead structure enhances sorption capacities besides permitting easy filtration. Thermodynamic studies confirm the endothermic and spontaneous nature of the adsorption. Pseudo 2nd-order kinetic models and Langmuir isotherms explain well the sorption mechanism. The adsorbents can be recycled for six cycles of re-generations and re-use. The sorbents developed are successfully applied for simultaneous remediation of chromate and phosphate from polluted water.

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Authors and Affiliations

  1. Department of Chemistry, Koneru Lakshmaiah Education Foundation, Green Fields, Vaddeswaram-522 502, Guntur Dt, Andhra Pradesh, India

    Sneha Latha Pala, Wondwosen Kebede Biftu & Kunta Ravindhranath

  2. Ethiopian Radiation Protection Authority, Addis Ababa, Ethiopia

    Wondwosen Kebede Biftu

  3. Department of Chemistry, RGUKT-Srikakulam, Andhra Pradesh, India

    Suneetha Mekala

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Pala, S.L., Biftu, W.K., Mekala, S. et al. Adsorptive removal of toxic chromate and phosphate ions from polluted water using green-synthesized nanometal (Mn-Al–Fe) oxide. Biomass Conv. Bioref. 13, 16835–16853 (2023). https://doi.org/10.1007/s13399-021-02293-0

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