Synthesis, performance, and modeling of immobilized nano-sized magnetite layer for phosphate removal

Zach-Maor, Adva; Semiat, Raphael; Shemer, Hilla

doi:10.1016/j.jcis.2011.01.021

Cited by 81 publications

(34 citation statements)

References 30 publications

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“…This adsorption capacity is among the highest values reported for most adsorbents in the literature (Table 1). The high adsorption capacity is probably due to the presence of nanosized iron oxide particles in the adsorbent which can have adsorption capacity in the order of 145 mg P/g Fe [28]. Based on this adsorption capacity the contribution of the iron oxide to the total adsorption capacity of the Purolite resin is estimated to be 19 mg P/g resin (13% Fe in resin x 145 mg P/g).…”

Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Nur

Johir

Loganathan

et al. 2014

Journal of Industrial and Engineering Chemistry

114

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Removing phosphate from water is important as it causes eutrophication, which in turn has a harmful effect on aquatic life, resulting in a reduction in biodiversity. On the other hand, recovery of phosphate from phosphorus containing wastewater is essential for developing an alternative source of phosphorus to overcome the global challenge of phosphorus scarcity.Phosphate removal from aqueous solutions was studied using an iron oxide impregnated strong base anion exchange resin, Purolite FerrIX A33E in batch and fixed-bed column experiments. Phosphate adsorption in the batch study satisfactorily fitted to the Langmuir isotherm with a maximum adsorption capacity of 48 mg P/g. In the column study, increase in inlet phosphate concentration (5-30 mg P/L), and filtration velocity (2.5-10 m/h) resulted in faster breakthrough times and increase in breakthrough adsorption capacities. Increase in bed height (3-19 cm) also increased adsorption capacity but the breakthrough time was slower.The breakthrough data were reasonably well described using the empirical models of Bohart-2 Adams, Thomas, and Yoon-Nelson, except for high bed heights. Phosphate adsorbed was effectively desorbed using 1M NaOH and the adsorbent was regenerated after each of three adsorption/desorption cycles by maintaining the adsorption capacity at > 90% of the original value. Greater than 99.5% of the desorbed P was recovered by precipitation using CaCl 2 .

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Section: Batch Adsorption Experimentsmentioning

confidence: 99%

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Nur

Johir

Loganathan

et al. 2014

Journal of Industrial and Engineering Chemistry

114

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“…They can also serve as high capacity -selectivity and recyclable ligands for toxic metal ions, radionuclides, organic and inorganic solutes [29]. Therefore water treatment based on the adsorption of contaminants using nanomaterials, such as cerium oxide or iron oxide-based nanoparticles, is relatively useful and cost effective method for water contaminants [30,31,32,33,34,35,36,37,38,39,40,41,42,43] and also for phosphate removal [30,31,33,34,35,36,38,39,40,41,43]. Adsorption is generally used to remove organic [44] and inorganic contaminants such as heavy metals [45] from water and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with chemical precipitation, adsorption does not produce large volumes of chemical sludge. Various types of phosphorus adsorbents made from zeolites [46], lanthanum and yttrium compounds [47,48], aluminum compounds [49, 50,51,52,53], zero-valent iron [54], amine-functionalize, Pr(OH)3 [55], magnesium amorphous calcium carbonate [56], zirconium compounds [57,58], and iron(III) oxide compounds [12,30,31,38,40,51,59,60,61] were studied.…”

mentioning

confidence: 99%

Phosphate removal and recovery from water using nanocomposite of immobilized magnetite nanoparticles on cationic polymer

Markeb

Alonso

Dorado

et al. 2016

Environmental Technology

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Highlights• Immobilization of magnetite nanoparticles on cationic polymer was synthesized.• Phosphate removal using magnetite based nanocomposites was tested.• Adsorption isotherms of phosphate at two pH; 5 and 7 were performed.• Different isotherms models were applied for experimental data fitting.• Regeneration and reusability of the magnetite based nanocomposites were carried out. Graphical Abstract 2 AbstractA novel nanocomposite based on magnetite nanoparticles (Fe3O4-NPs) immobilized on the surface of the cationic exchange polymer, C100, using a modification of the coprecipitation method was developed to obtain magnetic nanocomposites (NCs) for phosphate removal and recovery from water. High resolution TEM-EDS, SEM, XRD, and ICP-OES were used to characterize the NCs. The continuous adsorption process by the so-called breakthrough curves was used to determine the adsorption capacity of the Fe3O4 based NC. The adsorption 3 capacity conditions were studied under different conditions (pH, phosphate concentration and concentration of NPs). The optimum concentration of iron in the NC for phosphate removal was 23.59 mgFe/gNC. The sorption isotherms of this material were performed at pHs 5 and 7.Taking into account the real application of this novel material in real water, the experiments were performed at pH 7, achieving an adsorption capacity higher than 4.9 mgPO4-P/gNC.Moreover, Freundlich, Langmuir and a combination of them fit the experimental data and were used for interpreting the influence of pH on the sorption and the adsorption mechanism for this novel material. Furthermore, regeneration and reusability of the nanocomposite were tested obtaining 97.5 % recovery of phosphate for the first cycle and at least 7 cycles of adsorptiondesorption were carried out with more than 40% of recovery. Thus, this work described a novel magnetic nanoadsorbent with promoting properties for phosphate recovery in wastewater.

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“…The pH of the samples was measured using an Inolab 7320 pH-meter calibrated with three standards. The point of zero charge (pH pzc ) of the bentonite surface was determined using the pH drift method [28]. Scanning electron microscopy (SEM)-energy dispersive angle X-ray spectrometry (EDX) and X-ray diffraction (XRD) were employed to investigate the surface morphology and chemical composition of bentonite.…”

Section: Analytical Proceduresmentioning

confidence: 99%

Mitigation of Cr(VI) Aqueous Pollution by the Reuse of Iron-Contaminated Water Treatment Residues

Gheju

Balcu

2017

ChemEngineering

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Reducing the levels of heavy metals in wastewaters below the permissible limits is imperative before they are discharged into the environment. At the same time, water treatment technologies should be not only efficient, but also affordable. In accordance with these principles, this study assessed the possibility of recovering iron-contaminated residues, resulting from the treatment of synthetic acid mine drainage, for the subsequent remediation of Cr(VI) polluted aqueous solutions. Bentonite, an inexpensive and available natural material, was used as an adsorbent for the removal of Fe(II) from synthetic acid mine drainage (AMD). Then, Fe(II)-contaminated bentonite, the residue generated during the treatment of AMD, was recovered and activated with sodium borohydride in order to convert the adsorbed Fe(II) to Fe(0). Subsequently, the Fe(0)-containing bentonite (Be-Fe(0)) was further used for the treatment of Cr(VI) contaminated aqueous solutions. Reactive materials investigated in this work were characterized by means of scanning electron microscopy-energy dispersive angle X-ray spectrometry (SEM-EDX), X-ray diffraction spectroscopy (XRD), point of zero charge, and image photographs. The effect of several important parameters (pH, temperature, metal concentration, and ionic strength) on both treatment processes was investigated and discussed. It was shown that the efficiency of Cr(VI) removal with Be-Fe(0) was much higher than with bentonite. On the basis of the present study it can be concluded that residues generated during the treatment of AMD with bentonite can be used as a cheap precursor for the production an Fe(0)-based reagent, with good Cr(VI) removal potential.

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Synthesis, performance, and modeling of immobilized nano-sized magnetite layer for phosphate removal

Cited by 81 publications

References 30 publications

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Phosphate removal from water using an iron oxide impregnated strong base anion exchange resin

Phosphate removal and recovery from water using nanocomposite of immobilized magnetite nanoparticles on cationic polymer

Mitigation of Cr(VI) Aqueous Pollution by the Reuse of Iron-Contaminated Water Treatment Residues

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