Arsenic adsorption using copper (II) oxide nanoparticles

Goswami, A.; Raul, Prasanta Kumar; Purkait, Mihir Kumar

doi:10.1016/j.cherd.2011.12.006

Cited by 271 publications

(120 citation statements)

References 42 publications

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“…In general, As(III) is adsorbed at neutral pH ( Figure 3) and As(V) at a wide range of pH (2-10) depending on the adsorbent material used. A similar trend on arsenic adsorption by various adsorbents was reported by [50,57,60,103].…”

Section: Effects Of Ph On Arsenic Removalsupporting

confidence: 84%

“…At a certain selected pH, the adsorption showed an increasing trend due to the positively charged alumina complexes AlF 2+ and AlF 2 + on fluoride removal by acidic alumina [32]. The fluoride adsorption decreased after pHzpc because the concentration of protonated surface sites decreases with increasing pH [4,73], which causes strong competition of hydroxide ions [57]. A similar observation was reported by [66] on defluoridation of drinking water using chitosan-based mesoporous alumina.…”

Section: Effects Of Ph On Fluoride Removalsupporting

confidence: 70%

“…These materials include anions and cations and organic matters [51][52][53][54][55]. Anions such as sulfate, nitrate, carbonate, chloride, bicarbonate, and phosphate influence adsorption by adjustment of the electrostatic charge at the solid surface because of the same negative ions [11,[56][57][58][59][60][61]. The effects of anions on fluoride removal were reported by [40,[62][63][64][65][66].…”

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

“…A similar observation was reported by [89] on aluminum-loaded Shirasu-zeolite as an adsorbent. Arsenic adsorption was reduced by more than 20% when phosphate concentration increased by more than 0.2 mM on copper (II) oxide nanoparticles as adsorbents [57]. Maiti et al [50] reported that arsenic was reduced to 72.9% removal when phosphate concentration was increased to 5 mg/L on synthetic siderite as an adsorbent for As(V) removal.…”

Section: 12mentioning

confidence: 99%

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A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Effects Of Ph On Arsenic Removalsupporting

confidence: 84%

Section: Effects Of Ph On Fluoride Removalsupporting

confidence: 70%

Section: Adsorption Methods For Arsenic and Fluoride Removalmentioning

confidence: 99%

Section: 12mentioning

confidence: 99%

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A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…The plot of C e /q e versus C e at 20 o C is shown in Figure 9a. The essential characteristics of the Langmuir isotherm can be expressed in terms of a dimensionless equilibrium parameter (R L ), which is defi ned by the following equation: (6) where b (L mg -1 ) is the Langmuir constant and C 0 (mg L -1 ) is the highest initial concentration of the adsorbate. The value of R L indicates the type of the isotherm to be either unfavorable (R L > 1), linear (R L = 1), favorable (0 < R L < 1) or irreversible (R L = 0).…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of Ni²⁺from aqueous solution by magnetic Fe@graphite nano-composite

Konicki

Pelka

Arabczyk

2016

Polish Journal of Chemical Technology

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The removal of Ni 2+ from aqueous solution by iron nanoparticles encapsulated by graphitic layers (Fe@G) was investigated. Nanoparticles Fe@G were prepared by chemical vapor deposition CVD process using methane as a carbon source and nanocrystalline iron. The properties of Fe@G were characterized by X-ray Diffraction method (XRD), High-Resolution Transmission Electron Microscopy (HRTEM), Fourier Transform-Infrared Spectroscopy (FTIR), BET surface area and zeta potential measurements. The effects of initial Ni 2+ concentration (1-20 mg L -1 ), pH (4-11) and temperature (20-60 o C) on adsorption capacity were studied. The adsorption capacity at equilibrium increased from 2.96 to 8.78 mg g -1 , with the increase in the initial concentration of Ni 2+ from 1 to 20 mg L -1 at pH 7.0 and 20 o C. The experimental results indicated that the maximum Ni 2+ removal could be attained at a solution pH of 8.2 and the adsorption capacity obtained was 9.33 mg g -1 . The experimental data fi tted well with the Langmuir model with a monolayer adsorption capacity of 9.20 mg g -1 . The adsorption kinetics was found to follow pseudo-second-order kinetic model. Thermodynamics parameters, ΔHO, ΔGO and ΔSO, were calculated, indicating that the adsorption of Ni 2+ onto Fe@G was spontaneous and endothermic in nature.

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