Poly o-phenylenediamine–MgAl@CaFe2O4 nanohybrid for effective removing of lead(II), chromium(III) and anionic azo dye

In this work magnetic MgAl@CaFe2O4–poly o-phenylenediamine nanohybrid have been synthesized and was characterized with TEM, SEM, FT-IR, VSM, UV–vis and XRD techniques. Prepared nanocomposite showed excellent adsorption properties respect to lead and chromium ions as well as Congo red (CR). Equilibrium times were 5 and 10 min for metal ions and dye, respectively. Moreover, removal percentages were about 90%, 75% and 96% for lead, chromium and CR. Furthermore, kinetic study revealed that adsorption followed second order mechanism. Maximum adsorption capacity of 500, 1000 and 500 mg g−1 was obtained for chromium, lead and CR as adsorption curves well fitted with Langmuir isotherm model.

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