Adsorption studies of phosphate ions on alginate-calcium carbonate composite beads

Mahmood, Zahed; Nasir, Subriyer; Jamil, Nadia; Sheikh, Asma; Akram, Adnan

doi:10.5897/ajest2014.1784

Cited by 24 publications

(8 citation statements)

References 11 publications

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“…It is very important to verify the carbonate content in sediments because carbonate can immobilize phosphorus. Carbonate solubility is mainly affected by the pressure, temperature and pH (Hauck et al 2012; Zaaboub et al 2014; Mahmood et al 2015). The bottom water salinity ranged from 0.03 to 13.48 at stations 1 and 15, respectively.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

et al. 2016

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The Guapimirim estuary is the main tributary of Guanabara bay and is located in the northeast portion. Although it is protected, this estuary has been experiencing strong anthropogenic pressure, which has led to changes in the natural characteristics. Large amounts of sewage are dumped into the bay through tributaries, thereby changing the water and bottom sediment quality. One of the main elements of sewage is phosphorus. Despite its importance to life, a high concentration of this nutrient in the environment can result in eutrophication. This work describes the phosphorus distribution in its different fractions in the bottom sediment at 16 stations located in the main channel of the Guapimirim estuary. These results are correlated with data on grain size, organic matter and calcium carbonate content in the bottom sediment and with physicochemical parameters of the bottom water. The grain size decreases toward the mouth of the estuary, whereas the organic matter and carbonate content increase. The salinity increases significantly at 3.5 km upstream from the mouth, where there is also a notable increase in fine sediments; the same site is the mean position of the salinity front. The temperature and pH increase in the same direction. The Pinorg-total ranges between 3.18 and 7.13 µmol g−1, increasing toward the mouth. The same trend is observed for the other phosphorus fractions P-Ca, P-Fe and P-f.a., which range from 0.68 to 1.91, 0.79 to 1.71 and 0.03 to 0.93 µmol g−1, respectively. The P-Ca and P-Fe fractions are the most representative in the Pinorg-total, occurring at 26.3 and 26.0 %, respectively.

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Section: Resultsmentioning

confidence: 99%

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

et al. 2016

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“…Zahid et al used calcium alginate beads doped with calcium carbonate for the removal of phosphate ions [ 33 ]. Han et al entrapped the hydroxides of Mg and Al in the beads of calcium alginate and studied the extraction of phosphate [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Phosphate from Polluted Waters Using Calcium Alginate Beads Doped with Active Carbon Derived fromA. asperaPlant as Adsorbent

Ravulapalli

Ravindhranath

2017

Journal of Analytical Methods in Chemistry

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An adsorbent prepared by entrapping active carbon derived from the stems of Achyranthes aspera plant in the calcium alginate beads (CABAA) has been investigated for its adsorption nature towards the removal of phosphate by varying various physicochemical parameters. Surface morphological studies are made using FTIR, XRD, FESEM, and EDX. The sorption mechanism is analyzed using Freundlich, Langmuir, Dubinin-Radushkevich, and Temkin adsorption isotherms. The adsorption kinetics is found to follow the pseudo-second-order model. Thermodynamic parameters are analyzed and found that the adsorption is endothermic and nonspontaneous in nature. The maximum amount of phosphate adsorbed onto CABAA is found to be 133.3 mg/g of active carbon and, furthermore, the adsorbent is highly selective. The methodology developed is successfully applied to polluted water samples.

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“…15/147,437 (2014)]. Other researchers including Ociński et al (2016), Derakhshandeh et al (2012), and Mahmood et al (2015) also experimented successfully within these ranges.…”

Section: Preparation Of Adsorbentmentioning

confidence: 96%

“…The sludge was encapsulated in calcium alginate beads using the ionic cross-linking technique previously reported by Mahmood et al (2015) with slight modification. Commercial grade sodium alginate [laboratory reagent (LR) grade, Breckland Scientific Supplies, UK] was first dissolved in double distilled water and stirred to obtain a gel-like consistency.…”

Section: Preparation Of Adsorbentmentioning

confidence: 99%

“…However, activated carbon is expensive to produce and may not be the most viable option. Mahmood et al (2015) studied the use of alginate calcium-carbonate beads for phosphate adsorption but reported a low phosphate adsorption capacity of only 0.62 mg=g. This study aims to encapsulate lime-iron sludge, a waste material, in calcium alginate beads as a low-cost adsorbent and at the same time maintain a high adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

Chittoo

Sutherland

2019

J. Environ. Eng.

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Excessive discharge of phosphates in municipal and industrial effluents into water bodies continues to amplify the rate and extent of eutrophication that is impairing aquatic ecosystems throughout the world. Consequently, research into technologies to combat the problem of eutrophication continues unabated. This study aimed to develop a protocol to encapsulate dewatered lime-iron sludge in calcium alginate beads and assess and optimize its phosphate adsorption performance. Response surface methodology (RSM) and artificial neural network (ANN) were used to optimize the encapsulation process through parameter variation. RSM was superior in capturing the nonlinear behavior of the process. Numerical optimization in RSM revealed that maximum adsorption could be obtained from beads prepared using 0.25 g sodium alginate and 0.5 g lime-iron sludge in 25 mL of distilled water to produce a homogeneous mixture and added dropwise into a solution of 0.31 g CaCl 2 in 25 mL of distilled water. The accuracy of the RSM prediction was subsequently validated by laboratory experiments that revealed a residual error of 2.9% and thus highlights the applicability of the model. Batch experiments were conducted and modeled to expound the mechanisms of adsorption. Kinetic data were best simulated using the pseudo-second order model while equilibrium data followed the Langmuir isotherm at room temperature and the Sips isotherm at higher temperatures. Physisorption, hydrogen bonding, dipole interaction, and ligand exchange were the dominant attachment mechanisms while film and intraparticle diffusion were the pertinent transport mechanisms. The beads exhibited a maximum monolayer adsorption capacity of 8.3 mg=g that compared well to other phosphate-targeting adsorbents reported in the literature.

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Adsorption studies of phosphate ions on alginate-calcium carbonate composite beads

Cited by 24 publications

References 11 publications

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

Phosphorus fractionation distribution in Guapimirim estuary: SE Brazil

Extraction of Phosphate from Polluted Waters Using Calcium Alginate Beads Doped with Active Carbon Derived fromA. asperaPlant as Adsorbent

Adsorption Using Lime-Iron Sludge–Encapsulated Calcium Alginate Beads for Phosphate Recovery with ANN- and RSM-Optimized Encapsulation

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