Redox-Assisted Arsenic(III) Adsorption for Removal from Aqueous Solution by Cerium(IV)-Incorporated Zirconium Oxide Nanocomposites

Abstract

Ceria-incorporated zirconia nanocomposites (CIZNCs) are prepared and characterized by some latest analytical tools. The efficiency of this material is evaluated toward arsenic­(III) immobilization for removal via adsorption from its aqueous phases. The physicochemical aspects of this immobilization reaction have been reported at optimized pH 5.0. The kinetics of this reaction is of pseudo-second order type. The equilibrium data fit very well with the Langmuir isotherm with a monolayer adsorption capacity of 17.07 mg·g–1 (226 mmol·kg–1) at 303 K. Analysis of reaction kinetics parameters shows that the fraction of molecules bearing the threshold energy of reaction (ΔN/N av) is 0.99 at our working conditions. Thermodynamic analysis of equilibrium data reveals the exothermic and spontaneous nature of arsenic­(III) adsorption over CIZNCs. X-ray photoelectron spectroscopy and cyclic voltammetric examinations have confirmed the oxidation of arsenic­(III) to arsenic­(V) over the CIZNC surface.

Zirconia-based nanomaterials: recent developments in synthesis and applications

“…The adsorption capacity of ZrO 2 NPs was found to be 526.32 mg g −1 . Ghosh et al 115 synthesized a ceria-incorporated ZrO 2 nanocomposite having a particle size of ∼50 nm and employed it for the removal of arsenic( iii ) from the aqueous phase. The prepared material offers its surface for the oxidation of arsenic( iii ) to arsenic( v ).…”

Separation and recovery of arsenic from As, Cu, and Zn rich leaching liquor using a reduction-crystallization approach

“…[1][2][3][4] However, it is also a toxic substance that can cause serious environmental pollution. [5][6][7][8][9] Naturally, arsenic coexists with copper and zinc, and it can be enriched in the dust during the production of copper via pyrometallurgical process. [10][11][12][13][14][15][16] The dust is usually leached by H 2 SO 4 , [17][18][19][20] generating a large amount of As, Cu, and Zn rich leaching liquor.…”

Insight into the Mechanism of Arsenic(III/V) Uptake on Mesoporous Zerovalent Iron–Magnetite Nanocomposites: Adsorption and Microscopic Studies

“…Several approaches have been created and modified to treat As-polluted water. − Among these methods, adsorption is the most promising because of its easy application, cost benefits, and potential for reuse . A number of nano-based metal oxides, such as alumina, zirconium oxide, cerium oxide, copper­(II) oxide, magnesium oxide, crystalline titanium oxide, and zinc oxide, have been examined for arsenic fixation. − We have investigated arsenic removal using aluminum oxide and ferrihydrite. , The presence of suitable functional groups on the nanoadsorbent surface coupled with their high surface area makes them fit for arsenic removal . The main drawback that is associated with nano-based materials is the tedious solid–liquid separation process because of their narrow size and high hydrophilicity.…”