Removal of phosphate from aqueous solutions and sewage using natural and surface modified coir pith

Krishnan, K. Anoop; Haridas, Ajit

doi:10.1016/j.jhazmat.2007.07.015

Cited by 179 publications

(88 citation statements)

References 32 publications

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“…As shown in Figure 4, in this study, the highest adsorption capacities value were at pH 7 indicating that the species involved in adsorption process are those which are related to the pKa2 value of 7.2. Thus, HPO4 2-seems to have better affinity to form bidentate complexes with the magnetite NPs than H2PO4 -forming M-OH + complex [95,96,97]. Moreover, when the pH<pKa (as pKa2 in this case), the surface of the adsorbent is more positively charged and more efficient for attracting negatively charged phosphate species through electrostatic interaction.…”

Section: Effect Of the Ph On The Adsorption Capacities And On The Nanmentioning

confidence: 92%

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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Section: Effect Of the Ph On The Adsorption Capacities And On The Nanmentioning

confidence: 92%

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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“…It may happen through the inner sphere complex, when PO4 3-anions create a covalent chemical bond with a metallic cation on the surface of AWBs, leading to the liberation of other anions, which formerly attached to the metallic cation (Loganathan et al 2014). This mechanism was reported for the case of decontaminating P by natural and iron impregnated coir pith (Krishnan and Haridas 2008). The authors suggested that in the pH range of 2.0−3.5, the ligand exchange occurred between H2PO4 -ions and surface OH -groups to form inner-sphere complexation as follows:…”

Section: Ligand Exchangementioning

confidence: 74%

“…The optimum pH values were found to be low (e.g. 2, 3) by Krishnan and Haridas (2008); Jeon and Yeom (2009);Mallampati and Valiyaveetttil (2013). On the other hand, high optimum pH values (e.g.…”

Section: Effect Of Phmentioning

confidence: 94%

“…In contrast, the longer contact time was necessary for the equilibrium to be reached by other AWBs. It was shown to be 15 h for La(III), Ce(III) and Zr(IV) loaded SOW gels (Biswas 2008); 12 h for iron impregnated coir pith (Krishnan and Haridas 2008); and 6 h for Zr(IV) loaded apple peels (Mallampati and Valiyaveettil 2013). The short contact time means that AWBs do not have to be kept in reactors for a long time, and thus the space can be saved.…”

Section: Effect Of Contact Timementioning

confidence: 99%

“…Some researchers have treated raw AWBs directly with metal solutions, e.g. Han et al (2005); Krishnan and Haridas (2008); Huang et al (2009); Kose and Kivanc (2011);Mallampati and Valiyaveettil (2013). Krishnan and Haridas (2008) found that, the maximum PO4 3-adsorption capacity of Fe impregnated coir pith (CP-Fe-I) was improved 5-6 times as compared to natural coir pith (CP), owing to iron impregnation.…”

Section: Phosphorus Adsorption Performance By Modified Awbsmentioning

confidence: 99%

See 2 more Smart Citations

Agricultural By-Products for Phosphorous Removal and Recovery from Water and Wastewater: A Green Technology

Ngo

Guo

Nguyen

et al. 2016

Green Technologies for Sustainable Water Management

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Phosphate uptake studies on different types of lanthanum‐loaded polymeric materials

Sowmya

Meenakshi

2014

Env Prog and Sustain Energy

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Three different polymeric materials loaded with La(III) were prepared such as La(III)‐loaded silica‐chitosan composite (LSCC), an inorganic‐organic hybrid material; La(III)‐loaded cross‐linked chitosan beads (LCB), a biopolymer; La(III)‐loaded Duolite C 466 (LDR), a commercially available styrene divinyl benzene co polymer with imino diacetic acid and the adsorption behavior of phosphate on these three adsorbents were investigated in batch mode. The effects of contact time, temperature of solution, adsorbent dosage, initial pH of solutions, and coexistent anions were analyzed. The adsorption capacities of LSCC, LCB, and LDR from 1000 mg L−1 of phosphate solution were 155.4, 84.2, and 74.2 mg/g, respectively. Regenerations of the LSCC, LCB, and LDR were carried out with 0.25 M NaOH solution. All the three adsorbents were selective toward the phosphate ion in the presence of common ions like Cl−, NO3−, SO42−, and HCO3− present in natural water. The Freundlich isotherm model seems to be a better fit than the Langmuir and Dubinin‐Radushkevich isotherm models. Thermodynamic parameters such as ΔG°, ΔH°, and ΔS° were calculated in order to understand the nature of adsorption process. The adsorption kinetics data were best described by the pseudo‐second‐order rate equation. The adsorbents were characterized using SEM with EDX, FTIR and BET surface area. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 146–154, 2015

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Removal of phosphate from aqueous solutions and sewage using natural and surface modified coir pith

Cited by 179 publications

References 32 publications

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

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

Agricultural By-Products for Phosphorous Removal and Recovery from Water and Wastewater: A Green Technology

Phosphate uptake studies on different types of lanthanum‐loaded polymeric materials

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