Notice of RetractionApplication of High Efficiency Inorganic Adsorbent Bentonite on Removal of Ni(II) from Aqueous Solutions

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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Bentonite, because of high adsorption capacity, can be used as an effective adsorbent to treat waste water contaminated by trace heavy metals. Adsorption behavior of Ni(II) from aqueous solutions on bentonite was investigated as a function of connect time, pH, clay dosage, and temperature using batch technology. The results showed that 2 hours were enough to achieve equilibration and kinetic adsorption process was described by the pseudo-second-order rate equation well. The adsorption of Ni(II) on bentonite was strongly dependent on pH values, and the main control mechanisms were ionic exchange and surface complexation. The adsorption efficiency increased as the clay amount increasing and the removal percentage of Ni(II) achieved 98% with the dosage of 0.5 g/100mL. The amount of adsorption of Ni(II) on bentonite increased with the increasing of temperature. The negative values of ΔG and the positive value of AH indicated that adsorption of Ni(II) on bentonite was an endothermic process in nature. The adsorption process followed well by Tangmuir model and the Q_m was 26.8821 mg/g. Thus, bentonite can be used as an effective adsorbent for removing trace Ni(II) from aqueous solutions.