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Corncob-supported aluminium-manganese binary oxide composite enhanced removal of cadmium ions

Zheng, Liuchun, Peng, Dan, Meng, Peipei
Colloids and surfaces 2019 v.561 pp. 109-119
adsorbents, adsorption, analytical methods, cadmium, colloids, coordination compounds, corn cobs, electrostatic interactions, endothermy, equations, ions, manganese oxides, models, moieties, pH, sorption isotherms, temperature, thermodynamics
Aluminium-manganese binary oxide was coated successfully on raw corncob (RCC) to increase the oxygenic functional groups, and then produced an adsorbent (named as AMOCC). Accordingly, conventional factors, such as dosages, pH values, contact time and temperature, were evaluated for its absorptive properties, while it was characterized by several analytical methods. Moreover, adsorption isotherms, kinetic and thermodynamic analysis were applied to describe its adsorption process, which reflected that MnO, MnOH and AlOH were introduced to the positions of hydroxyl (OH) groups, and the O of MnO and MnOH could play a significant role in the coordination complex with Cd (II) ions. Moreover, electrostatic interaction occurred at the position of AlOH during adsorption. Therefore, results showed that this adsorbent exhibited the maximum adsorption capacity of 45.58 mg/g, which was higher than RCC and other modified adsorbents previously reported. Further, the Langmiur isotherm and the pseudo-second-order models fitted the experimental data better, and thermodynamic equations revealed the spontaneous and endothermic nature of adsorption.