Notice of RetractionAdsorption of Arsenic onto Ce-La Binary Hydroxide Encapsulated in Calcium Alginate Beads

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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The adsorption of arsenate and arsenite onto a Ce-La binary hydroxide, a mixture of mainly Ce(VI) and La(III) hydroxides, as a recovery of waste ceria glass polishing powder, encapsulated in calcium alginate beads was studied under various pH values, adsorbent dose, and contact time. The effect of sorbent mass in the gel bead, solution pH, contact time and As(III) and As(V) concentration on sorption has been investigated. A 8% (w/v) of CLH in the gel beads was found to provide both good sorption performance and spherical shape. The optimum pH range was observed to be with 5-10 for As(III) and 4-7 for As(V). Equilibrium was reached after 48 h contact time for As(III) and 24 h for As(V), respectively. The adsorptive rate of both arsenic species on the adsorbent obeys pseudo second order kinetic models (R² >; 0.97). Adsorption isotherm at pH 4.0 for As(III) and at pH 8.0 for As(V) fits the Langmuir model of adsorption over the As concentration range 0.5-250 mg As L^-1. The experiment provides also a promising way to use waste as a material for the treatment of other wastes or contaminants from the point of recycling.