Selective adsorption of phosphate from seawater and wastewater by amorphous zirconium hydroxide

Chitrakar, Ramesh; Tezuka, Satoko; Sonoda, Akinari; Sakane, Kohji; Ooi, Kenta; Hirotsu, Takahiro

doi:10.1016/j.jcis.2005.11.011

Cited by 267 publications

(153 citation statements)

References 29 publications

Supporting

Mentioning

136

Contrasting

Unclassified

Order By: Relevance

“…Though a high correlation coefficient (R 2 > 0.9) is obtained in each model, the phosphate adsorption in the present study most closely followed pseudo-second-order kinetics, by which a very accurate estimation of q e is achieved as well as the highest correlation coefficient (R 2 > 0.99) ( Table 3). Comparable results were observed in phosphate adsorption onto ZnCl 2 activated coir pith carbon [31], calcined electrocoagulated metal hydroxides sludge [32], amorphous zirconium hydroxide [14] and dolomite [33].…”

Section: Adsorption Kineticsmentioning

confidence: 76%

“…More recently some researchers studied the feasibility of phosphate adsorption from phosphate-rich streams. The various adsorbents used include industrial materials and byproducts (i.e., iron oxide tailings [5], fly ash [6], blast furnace slag [7] and red mud [8]), natural or synthetic minerals (i.e., goethite [9,10], dolomite [11] and alunite [12]), metal oxide/hydroxide (i.e., aluminum oxide, iron oxide, zirconium oxide [13] and zirconium hydroxide [14]) and other materials (i.e., ion exchange resin [15]). …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

View full text Add to dashboard Cite

a b s t r a c tA series of layered double hydroxides (LDHs) with different metal cations were synthesized to remove phosphate in waste sludge filtrate from a municipal wastewater treatment plant for phosphorus recovery and to help control eutrophication. The highest phosphate adsorption capacity was obtained by using Zn-Al-2-300, that is LDHs with Zn/Al molar ratio of 2 and calcined at 300 • C for 4 h. Circumneutral and mildly alkaline waters appeared suitable for the possible application of Zn-Al LDHs due to the amphoteric nature of aluminum hydroxide. Phosphate adsorption from the sludge filtrate by the LDHs followed pseudo-second-order kinetics, and the adsorption capacity at equilibrium was determined to be ∼50 mg P/g. Adsorption isotherms showed that phosphate uptake in this study was an endothermic process and had a good fit with a Langmuir-type model. The absorbed phosphate can be effectively desorbed (more than 80%) from LDHs particles by a 5 wt% NaOH solution. The regeneration rate of used LDHs was ∼60% after six cycles of adsorption-desorption-regeneration.

show abstract

Section: Adsorption Kineticsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Cheng

Huang

Wang

et al. 2009

Journal of Hazardous Materials

207

View full text Add to dashboard Cite

show abstract

“…1 revealed that nitrate adsorption on both samples could be linked to a simple anion/OH -exchange reaction on the PKS surface. In the case of a simple anion exchange, anion uptake decreases monotonically with pH due to the increase of OH concentration and the change of surface charge to negative [23]. …”

Section: Effect Of Phmentioning

confidence: 99%

Purification of Nitrate Contaminated Aqueous Solution Using Modified and Unmodified Palmkernel Shell

Adebayo¹,

Adaramodu²,

Ajayi³

et al. 2016

ILCPA

View full text Add to dashboard Cite

Abstract. The adsorption capacity of PKS which was used as an adsorbent in this study was boosted by acid thermoactivation. The nitrate sorption potential, point zero charge (PZC) and surface area of the PKS were enhanced by the acid thermoactivation process. The process of sorption of nitrate from solution was analyzed using five different isotherm models [Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations]. The value of the Langmuir monolayer sorption capacity qm [mg/g] increased from 60.12 to 85.73, PZC values increased from 5.50 to 8.40, and the surface area [m 2 /g] value increased from 29 m 2 /g to 98 m 2 /g after the activation process. The effect of pH on the sorption of the nitrate on both sorbents was also considered and it was discovered that the adsorption of nitrate decreases with increase in nitrate solution pH. The effects of the sorbents dose on the sorption process was also studied and the results showed that the amount of nitrate sorbed by both sorbent decreases with increase in sorbent dose.

show abstract

“…Among them, hydrous zirconium oxide has remarkable selectivity to phosphoric ion (Urnius et al 2000), and also high resistance against attacks by acids, alkalis, oxidants, and reductants (Suzuki et al 2000). Previous studies (Chitrakar et al 2006;Liu et al 2008;Biswas et al 2008) have found that the zirconium oxide has a high P adsorption capacity and can be used for P removal from water. However, due to its relatively high cost, the application of pure zirconium oxide for P removal is not cost-effective.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Phosphate from Aqueous Solution Using an Iron–Zirconium Binary Oxide Sorbent

Ren

Shao

Zhang

2012

Water Air Soil Pollut

119

View full text Add to dashboard Cite

In this study, an iron-zirconium binary oxide with a molar ratio of 4:1 was synthesized by a simple coprecipitation process for removal of phosphate from water. The effects of contact time, initial concentration of phosphate solution, temperature, pH of solution, and ionic strength on the efficiency of phosphate removal were investigated. The adsorption data fitted well to the Langmuir model with the maximum P adsorption capacity estimated of 24.9 mg P/g at pH 8.5 and 33.4 mg P/g at pH 5.5. The phosphate adsorption was pH dependent, decreasing with an increase in pH value. The presence of Cl − , SO 4 2− , and CO 3 2− had little adverse effect on phosphate removal. A desorbability of approximately 53 % was observed with 0.5 M NaOH, indicating a relatively strong bonding between the adsorbed PO 4 3− and the sorptive sites on the surface of the adsorbent. The phosphate uptake was mainly achieved through the replacement of surface hydroxyl groups by the phosphate species and formation of innersphere surface complexes at the water/oxide interface. Due to its relatively high adsorption capacity, high selectivity and low cost, this Fe-Zr binary oxide is a very promising candidate for the removal of phosphate ions from wastewater.

show abstract

Selective adsorption of phosphate from seawater and wastewater by amorphous zirconium hydroxide

Cited by 267 publications

References 29 publications

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Phosphate adsorption from sewage sludge filtrate using zinc–aluminum layered double hydroxides

Purification of Nitrate Contaminated Aqueous Solution Using Modified and Unmodified Palmkernel Shell

Adsorption of Phosphate from Aqueous Solution Using an Iron–Zirconium Binary Oxide Sorbent

Contact Info

Product

Resources

About