Removal of phosphate from water by a highly selective La(III)-chelex resin

Wu, Renren; Lam, King-hang; Lee, Joyce M.N.; Lau, Tai‐Chu

doi:10.1016/j.chemosphere.2007.04.022

Cited by 139 publications

(52 citation statements)

References 18 publications

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“…Another attractive feature of this technique is that the nutrient-loaded filters can be used in agriculture as phosphate fertilizer and soil conditioner [10]. A large number of materials from natural minerals to synthetic ones have been used as adsorbents to adsorb phosphate from wastewater [11][12][13][14][15]. Recently, the application of low cost and easily available materials for phosphate removal has been widely investigated, such as fly ash [16][17][18], blast furnace slag [19][20][21], iron oxide tailing [22], red mud [23,24], Ca-based adsorbents, and iron-based compounds [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Zhang

Liu

et al. 2009

Journal of Colloid and Interface Science

386

155

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a b s t r a c tPhosphate removal is important in the control of eutrophication of water bodies and adsorption is one of the promising approaches for this purpose. A Fe-Mn binary oxide adsorbent with a Fe/Mn molar ratio of 6:1 for phosphate removal was synthesized by a simultaneous oxidation and coprecipitation process. Laboratory experiments were carried out to investigate adsorption kinetics and equilibrium, in batch mode. The effects of different experimental parameters, namely contact time, initial phosphate concentration, solution pH, and ionic strength on the phosphate adsorption were investigated. The adsorption data were analyzed by both Freundlich and Langmuir isotherm models and the data were well fit by the Freundlich isotherm model. Kinetic data correlated well with the pseudo-second-order kinetic model, suggesting that the adsorption process might be chemical sorption. The maximal adsorption capacity was 36 mg/g at pH 5.6. The phosphate adsorption was highly pH dependent. The effects of anions such as Cl À ; SO 4 2À , and CO 3 2À on phosphate removal were also investigated. The results suggest that the presence of these ions had no significant effect on phosphate removal. The phosphate removal was mainly achieved by the replacement of surface hydroxyl groups by the phosphate species and formation of inner-sphere surface complexes at the water/oxide interface. In addition, the adsorbed phosphate ions can be effectively desorbed by dilute NaOH solutions. This adsorbent, with large adsorption capacity and high selectivity, is therefore a very promising adsorbent for the removal of phosphate ions from aqueous solutions.

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Section: Introductionmentioning

confidence: 99%

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Zhang

Liu

et al. 2009

Journal of Colloid and Interface Science

386

155

View full text Add to dashboard Cite

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“…Commercial ion exchange resins (Wu et al 2007) have outstanding adsorption properties, but have high cost. The application of low-cost and easily available materials in wastewater treatment, including industrial waste solid Atar et al 2012;Olgun and Atar 2009;Olgun and Atar 2011;Olgun et al 2013), bentonite (Haghseresht et al 2009), activated red mud (Liu et al 2007), gas concrete (Oguz et al 2003) and calcite (Karageorgiou et al 2007), has been widely investigated in recent years.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus removal from aqueous solutions containing low concentration of phosphate using pyrite calcinate sorbent

Chen

Wang

Xie

et al. 2014

Int. J. Environ. Sci. Technol.

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Natural pyrite was modified by calcination under nitrogen (N 2 ) atmosphere to produce a novel sorbent for removing phosphorus (P) with low concentration from aqueous solutions. The crystallinity, porous texture, magnetic susceptibility and performance in P removal of pyrite calcinates depended on calcination temperatures. The sorbent obtained at calcination temperature of 500-600°C possessed the most efficient P removal. Solution pH in the range of 3.0-9.0 and anions of chloridion (Cl -), nitrate (NO 3 )-and sulfate (SO 4 2-) had ignorable effect on P removal. The batch adsorption experiment shows that the maximum sorption capacities for P of this novel sorbent (q m ) were up to 1.61-5.36 mg P/g at adsorption temperatures of 15-35°C. Dynamic sorption and regeneration experiments were conducted in an adsorption column filled with pyrite calcined at 600°C. The study found that oxygen was an important control factor responsible for P adsorption because the oxidization of Fe 2? to Fe 3? on the surface of the sorbent followed by P being bound to a ferric hydroxide surface film was the crucial processes. The mechanism was confirmed with surface characterization techniques including field emission scanning electron microscope and X-ray photoelectron spectroscopy. This research potentially provides a cheap, abundant sorbent for P removal from the secondary effluent of municipal wastewater treatment plant.

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“…Chelex 100 finds application in many fields, it was effective in binding several metal ions ( [4][5][6][7][8][9] .…”

Section: Oriental Journal Of Chemistrymentioning

confidence: 99%

Removal of Cd (II) and Hg(II) by chelating resin Chelex-100

Amara-Rekkab¹,

Didi²

2015

Orient. J. Chem

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A sensitive, simple method for the determination of amounts of mixture of Hg 2+ and Cd 2+ by spectrophotometry was described based on the formation of the Hg 2+ -Cd 2+ -PAN complex in water media. Optimal conditions such as reagent amounts, and pH for the Hg 2+ -Cd 2+ determination were reported. It was found that the 2:1 PAN-Hg 2+ -Cd 2+ complex dominate at pH 13.0. In another hand, the sorption of mixture mercury (II) and cadmium (II) from aqueous medium on a chelating resin Chelex 100 was studied in batch mode. Since the extraction kinetic was obtained, with a mixture of 0.1 g of resin and 5 mL of mixture at 1 mmol/L of initial concentration, extraction equilibrium was reached within 20 min of mixing. The influence of some parameters such as initial mixture ions concentrations, initial pH of aqueous solution, ion strength and the amounts of resin have been studied at fixed temperature (20±1°C). The optimum pH value level for quantitative sorption was up to 2.6. The best performance obtained was 97.1% of extraction yield equivalent to 15.65 mg/g of resin. The pseudo-first-order, pseudo-second-order models and the intra-particle diffusion model were used to describe the kinetic data and rate constants were evaluated.

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Removal of phosphate from water by a highly selective La(III)-chelex resin

Cited by 139 publications

References 18 publications

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Removal of phosphate from water by a Fe–Mn binary oxide adsorbent

Phosphorus removal from aqueous solutions containing low concentration of phosphate using pyrite calcinate sorbent

Removal of Cd (II) and Hg(II) by chelating resin Chelex-100

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