Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Abstract

This study focused on the characteristics and mechanisms of arsenate [As(V)] adsorption onto manganese oxide‐doped aluminum oxide. The adsorbent surface was characterized via the Brunauer–Emmett–Teller method, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray diffraction. The characterization results indicated a rough and Al‐enriched surface, a surface area of 91.2 m2/g, and an amorphous structure for manganese oxide‐doped aluminum oxide. Most of the As(V) was adsorbed within 1.5 h, and the kinetics data were described well by the pseudo‐second‐order model. Meanwhile, the adsorption process was controlled by more than one rate‐limiting step. The Langmuir model fitted the isotherm data better compared with the Freundlich model, and the maximum adsorption amount was 114.5 mg/g at T = 298 K. The As(V) adsorption was an endothermic and spontaneous process. The optimal As(V) removal was achieved at a pH range of 4.0–6.0. Furthermore, the results of Fourier transform infrared spectroscopy and X‐ray photoemission spectroscopy suggested that As(V) adsorption was primarily through the adhesion to the surface hydroxyl groups and ligand exchange with the sulfate. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1009–1018, 2015

Review on Biosorption of Arsenic From Contaminated Water

“…The values of the correlation coefficient (R 2 ) indicated that the Langmuir model (R 2 ¼ 50.997) was more applicable to the isotherm data than the Freundlich model (R 2 ¼ 50.916-0.938) for the adsorption of As(V) on manganese oxide-doped aluminum oxide. In this study [82], the values of b increased from 0.57 to 0.61 when the temperature was increased from 298 to 318 K. Thus, the Langmuir isotherm parameters confirmed that As(V) adsorption would be more favorable at higher temperatures. The data for adsorption on CEZ revealed that it followed the Langmuir isotherm and the R 2 values determined for both As(III) and As(V) were 0.999 and 0.904, respectively [80].…”

“…In addition, As(III) and As(V) adsorption on mosambi peel [116], Arthrobacter sp. biomass [86], As adsorption on copper(II) oxide nanoparticles [140], dried biomass of H. verticilata [108], acid treated Devdaru leaf powder [138], and As(V) adsorption on manganese oxide-doped aluminum oxide [82] and pine leaves [141] fitted well to the pseudo-second order rather than to the pseudo-first order. Most of the kinetic data showed correlation coefficients as R 2 ¼ 0.99.…”

Evaluation of Al‐based nanoparticle‐impregnated sawdust as an adsorbent from byproduct for the removal of arsenic(V) from aqueous solutions

“…In the recent years, many researches have also been conducted to synthesize hybrid adsorbents incorporating Al oxides/hydroxides/oxyhydroxides to remove various anions from water . In our previous study, powdered Al‐based adsorbent (Al–Mn bimetal oxides) is synthesized and its remarkable performance for the removal of As(V) from water is observed . However, this adsorbent is unsuitable for fixed bed reactors because of several drawbacks, such as insufficient mechanical strength and poor hydraulic properties.…”

Absorbability of Highly Porous Aluminum Oxide Ceramics

“…The literature studies of the alumina oxide's adsorption concentrate rather on the assimilation of inorganic compounds [15][16][17][18][19][20][21][22][23]. The most frequent aim of the adsorption investigation is the removal of arsenic ions from drinking water [16][17][18].…”

“…The published processes for the improvement of the effectiveness of adsorption focus on the introduction of various elements or compounds into the adsorbents [18,20,23]. This work presents the enhancement of the absorbability by sufficient preparation techniques.…”