Manganese-oxide-coated alumina: A promising sorbent for defluoridation of water

Maliyekkal, Shihabudheen M.; Sharma, Atul Kumar; Philip, Ligy

doi:10.1016/j.watres.2006.08.007

Cited by 332 publications

(138 citation statements)

References 24 publications

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“…The experimental data (Fig. 3) were analyzed using Langergren pseudo-first-order model and pseudo-second-order model [35]. The kinetic parameters obtained from the models are given in Table 1.…”

Section: Adsorption Kinetics 321 Effect Of Contact Time and Initiamentioning

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

368

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: Adsorption Kinetics 321 Effect Of Contact Time and Initiamentioning

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

368

155

View full text Add to dashboard Cite

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“…In such a case, solid surface modification is necessary. Of great variety of techniques; plasma modification (Kuraica et al 2003;Punga and Borcia 2013), adsorption of different low-and high-molecular compounds (Chibowski et al 2010;Nosal-Wiercińska 2012, 2013Wiśniewska et al 2013a;Nosal-Wiercińska 2014) and synthesis of mixed oxides (Maliyekkal et al 2006;Wu et al 2010) acquired the most significant importance. Appropriate modification leads to obtaining solids of the properties desired in various ecological and technological processes (Kaźmierczak et al 2013;Nowicki et al 2014Nowicki et al , 2015a.…”

Section: Introductionmentioning

confidence: 99%

Impact of poly(vinyl alcohol) adsorption on the surface characteristics of mixed oxide Mn x O y –SiO2

et al. 2015

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The poly(vinyl alcohol) (PVA) influence on the adsorption and electrokinetic properties of the mixed oxide Mn x O y -SiO 2 /polymer solution system was examined. Three oxides differing with the Mn x O y contents were applied (0.2; 1 and 3 mmol/g SiO 2 , respectively). The PVA with the molecular weight 100 kDa was characterized with the acetate groups content equal to 14 %. Adsorption, solid surface charge and zeta potential measurements were made as a function of solution pH (3-10). The obtained results showed that the PVA adsorption amount strongly depends on not only the solution pH, but also manganese oxide content on the mixed oxide surface. The higher solution pH value (or Mn x O y content) is, the higher polymer adsorption is obtained. The PVA addition to the solid suspension causes minimal changes of the mixed oxide surface charge density, whereas the zeta potential of solid particles increases significantly in the polymer presence.

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“…However, the concentration of fluoride ion in groundwater is higher than 1.5 mg L À1 in many areas throughout the world. Fluoride removal techniques mainly include chemical precipitation (He and Cao, 1996), membrane processes (Tahaikt et al, 2007), adsorption (Maliyekkal et al, 2006;Wu et al, 2007), and ion exchange (Meenakshi and Viswanathan, 2007). Adsorption is effective in defluoridation, but its operation is complex.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

et al. 2011

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a b s t r a c tAn integrated electro-oxidation and electrocoagulation system was designed and used to remove As(III) and F À ions from water simultaneously. Dimensionally stable anodes (DSA), Fe electrodes, and Al electrodes were combined into an electrochemical system. Two pieces of DSA electrodes were assigned as the outside of the Fe and Al electrodes and were directly connected to the power supply as anode and cathode, respectively. The Fe and Al ions were generated by electro-induced process simultaneously. Subsequently, hydroxides of Fe and Al were formed. Arsenic ions are mainly removed by iron hydroxides and F À ions are mainly removed by the Al oxides. At the initial concentration of 1.0 mg L À1 , most of As(III) was transferred into As(V) within 40 min at current density of 4 mA cm À2 , whereas F À ions can be efficiently removed simultaneously. The effect of the ratio of Fe and Al plate electrodes and current density on the removal of As(III) and F À was investigated. With one piece of Fe plate electrode and three pieces of Al plate electrodes, it is observed that As(III) with concentration of 1 mg L À1 and F À with concentration of 4.5 mg L À1 can be removed and their final concentrations were below the values of 10 lg L À1 and 1.0 mg L À1 , respectively within 40 min. Removal efficiency of As(III) increases with the increase of solution pH. However, in the pH range of 6-7, removal efficiency of F À is the largest.

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Manganese-oxide-coated alumina: A promising sorbent for defluoridation of water

Cited by 332 publications

References 24 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

Impact of poly(vinyl alcohol) adsorption on the surface characteristics of mixed oxide Mn x O y –SiO2

Simultaneous removal of arsenite and fluoride via an integrated electro-oxidation and electrocoagulation process

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