Removal of Cadmium from Water Using Natural Phosphate as Adsorbent

Yaacoubi, H.; Zidani, O.; Mouflih, Mustapha; Gourai, M.; Sebti, Saı̈d M.

doi:10.1016/j.proeng.2014.09.039

Cited by 65 publications

(22 citation statements)

References 20 publications

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“…It might be due to homogeneous distribution of active sites on adsorbent surface [66]. Table 4 lists a comparison of maximum monolayer adsorption capacity of Cd(II) on various adsorbents.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Sahu

Mandal

Yadav

et al. 2016

Desalination and Water Treatment

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Red mud is an undesirable by-product of bauxite in Bayer process has been used as a low-cost adsorbent for the removal of Cd(II) from aqueous solution by batch mode of experiment. The red mud was activated by acid dilution followed by ammonia precipitation for better adsorption of Cd(II). To achieve optimum condition for adsorption, different variable parameters were studied. X-ray diffraction, SEM and EDX were used to characterize the adsorbent before and after cadmium adsorption. The maximum adsorption capacities of Cd(II) on activated red mud (ARM) were found to be 12.046 and 12.548 mg g −1 at temperature 293 and 303 K, respectively. Adsorption data of Cd(II) are best fitted to linearly transformed Langmuir isotherm with R 2 > 0.99. The pseudo-second-order model describes the kinetics of Cd(II) adsorption successfully to predict the rate constant of adsorption. Thermodynamic parameters reveal the endothermic, spontaneous and feasible nature of adsorption of Cd(II) onto ARM. The mass transfer study led to compute the external mass transfer coefficient (k f ) by the equation of McKay et al. and Weber-Mathews at temperature 293 and 303 K. The desorption efficiency of Cd(II) ions from ARM was 91.29% using 0.2-mol L −1 HCl.

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“…It might be due to homogeneous distribution of active sites on adsorbent surface [66]. Table 4 lists a comparison of maximum monolayer adsorption capacity of Cd(II) on various adsorbents.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Sahu

Mandal

Yadav

et al. 2016

Desalination and Water Treatment

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“…When the concentration increases from 50 to 150 mg/L, the dye removal (%) decreases from 89 and 85% to 47 and 24% for AR14 and AB92, respectively. This can be attributed to the lower surface area of adsorbent in the presence of the constant amount of adsorbent [22,23].…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

The potential application of tomato seeds as low-cost industrial waste in the adsorption of organic dye molecules from colored effluents

Najafi¹,

Pajootan

Ebrahimi

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThe objective of current study is to investigate the tomato seeds (TSs) as a low-cost industrial waste material to be employed in the adsorption of two acid dyes (C.I. Acid Red 14 (AR14) and C.I. Acid Blue 92 (AB92)). In this regard, field emission scanning electron microscope images, Fourier transform infrared analysis, and determination of isoelectric pH were used to characterize the surface morphology, functional groups, and surface charge of TS, respectively. Initial dye concentration, pH, and adsorbent dosage were studied as the key parameters that affect the adsorption performance. The isotherm, kinetic, and thermodynamic parameters of removal process were determined. It was found that the experimental data had followed the Langmuir isotherm model. The pseudo-second-order kinetic model described the rate of adsorption process properly. Temperature variation of adsorption process indicated that the removal of AR14 and AB92 by TS was an exothermic and spontaneous procedure. Finally, the cost analysis demonstrated that TS can be suggested as an effective and eco-friendly biosorbent for the removal of organic dyes from colored textile wastewaters.

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“…Phosphates have been used in ceramic materials, catalysts, adsorbents, fluorescent materials, dielectric substances, biomaterials, metal surface treatments, fertilizers, detergents, food additives, fuel cells, pigments, and other applications [1][2][3][4][5][6][7][8]. In these phosphate materials, calcium phosphate is an important compound used for many applications, such as in ion exchangers and adsorbents [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of these materials is expected all over the world. However, these reports mainly concerned hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 , and other phosphates were less reported.…”

Section: Introductionmentioning

confidence: 99%

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

Onoda¹

2017

ujms

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Calcium phosphate is an important material used in ion exchangers and adsorbents. In this work, calcium hydrogen phosphate dihydrate, CaHPO 4 •2H 2 O, was prepared from calcium nitrate solution and phosphoric acid. This phosphate transformed to calcium hydrogen phosphate un-hydrate, CaHPO 4 , by heating at 200ºC, and calcium pyrophosphate, Ca 2 P 2 O 7 , by heating at 400 and 700ºC. These calcium phosphates were used to remove trivalent iron cation, Fe 3+ in solution. Samples without heating and those heated at 200ºC indicated a high iron removal ratio. By the addition of these calcium phosphates and stirring for 5 minutes, a high ratio of iron cation was removed from the solution. This removal depended not only on the substitution of calcium to iron, but also on the precipitation of iron hydroxide. Calcium phosphates were also used to remove copper and nickel cations, Cu 2+ and Ni 2+. The removal ratios of copper and nickel cations were lower than those of iron cation.

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Removal of Cadmium from Water Using Natural Phosphate as Adsorbent

Cited by 65 publications

References 20 publications

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

The potential application of tomato seeds as low-cost industrial waste in the adsorption of organic dye molecules from colored effluents

Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution

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