Fluoride removal using Regenerated Spent Bleaching Earth (RSBE) from groundwater: Case study on Kuhbonan water

Malakootian, M; Fatehizadeh, Ali; Yousefi, Nader; Ahmadian, Mohammad; Moosazadeh, Mahmood

doi:10.1016/j.desal.2011.04.033

Cited by 44 publications

(24 citation statements)

References 22 publications

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“…Analysis of the data regarding fluoride absorption on bauxite particles by isotherm showed that using bauxite from the Jajarm, Khidbas, Khezri, Shahid Nilchian, Mendon, Hassanabad, Biglar, Shahbalaghi, and Tash mines with a correlation coefficient greater than 0.955, fluoride absorption obeyed the Langmuir adsorption isotherm. Sujana et al, Malakootian et al, and Das et al used bauxite as a fluoride adsorbent, and their experimental data was better described by the Langmuir absorption model (8,34,40). These mentioned studies are consistent with this study.…”

Section: Discussionsupporting

confidence: 81%

“…A study was conducted in Iran in 2011 by Malakootian et al to remove fluoride using regenerated spent bleaching earth. In this study, increasing the amount of adsorbent from 10 to 20 g/L (concentration of fluoride = 2.5 mg/L) increased removal efficiency from 66.41% to 74.01% (34). In India, Mohapatra et al used mineral oxides to remove fluoride.…”

Section: Discussionmentioning

confidence: 99%

“…Many epidemiologists have indicated in their reports, however, that there is the possibility of adverse effects with long-term exposure to fluoride, even where consumption is at the permissible limit (8,9). Global estimates suggest that over 70 million people suffer from fluorosis (10). Fluoride concentrations in the drinking water of large parts of the world are higher than allowed by the WHO guidelines (11).…”

Section: Introductionmentioning

confidence: 99%

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Use of bauxite from active Iranian mines for the removal of fluoride from drinking water

Malakootian

Javdan

Iranmanesh

2017

Environ Health Eng Manag

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Background: Fluoride plays an important role in bone and dentin mineralization; however, excess fluoride intake is harmful to mankind. Methods: This study evaluated the performance of bauxite from active Iranian mines in removing fluoride from drinking water. The effects of pH, contact time, adsorbent dose, and fluoride concentration on defluoridation and removal efficiency were determined. Kinetics and adsorption isotherms were studied. Fluoride levels were measured using SPADNS. Data analysis was performed using SPSS16. Results: Bauxite from the Jajarm mine had the lowest adsorbency (20 g/L) and required the shortest contact time (90 minutes) to reach equilibrium compared with the ore from bauxite mines evaluated in another study which had greater efficiency rates in removing fluoride from drinking water (58.15%). The fluoride removal efficiency rates of the other bauxite mines were as follows: Mendon > Sadrabad > Khidabas > Khezri > Shahbalaghi > Tash > Biglar. Bauxite from Shomal-e Yazd, Hasanabad, and Shahid Nilchian mines could not achieve the required efficiency to remove fluoride from drinking water without initial preparation and modification. The removal efficiency rates of actual samples were much lower than the synthetic samples because of confounding factors. Conclusion: As a result of the low cost and abundant availability of bauxite and the fact that its use does not require a particular expertise or sophisticated technology, the removal efficiency of this adsorbent can be increased to desirable levels through the use of corrective methods such as heating, acidifying, particle crushing, or the mixing of two or more removal systems. Keywords: Fluoride, Iran, drinking water, kinetics Citation: Malakootian M, Javdan M, Iranmanesh F. Use of bauxite from active Iranian mines for the removal of fluoride from drinking water.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of bauxite from active Iranian mines for the removal of fluoride from drinking water

Malakootian

Javdan

Iranmanesh

2017

Environ Health Eng Manag

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“…93.5% at pH 5. Because at low pH the concentration of H + is high [19], as H + ions were being removed by the biosorbent, instead of the Pb 2+ ions, [21,35] at higher concentration of H + ions, the biosorbent becomes more positive charge on the surface and the attraction between biosorbent and Pb 2+ ions is reduced [36]. At higher pH the capacity of the adsorbent reduced, the reduction in adsorption may be due to the increasing of OH -ions, or Pb 2+ ions were precipitated as lead hydroxide [2,37].…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

Removal of Toxic Pb(II) Ions from Aqueous Solution by Nano Sized Flamboyant Pod (Delonix regia)

Abdel‐Rahman¹,

Al-Farhan²,

Abu‐Dief³

et al. 2017

Arch Chem Res

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The removing of toxic heavy metals from aqueous solution by agricultural biosorbents was investigated by studying the effect of nano sized (Delonix regia) and chemically modified biosorbent citric acid Delonix regia (CADR) for removing of Pb 2+ ions. TEM, XRD and EDS, FT-IR, SEM methods were used for characterizing the biosorbent (Delonix regia). The effect of contact time, pH, temperature, dosage of biosorbent, and Pb 2+ ion concentration on adsorption process were studied. The maximum biosorption capacities (q m ) of Pb 2+ by Delonix regia biosorbent was 43.62 mg/g. The highest R. E was (93.5%) at pH 5. FT-IR method showed that the adsorption of metal ions occurs by functional groups on the surface of Delonix regia powder. The biosorption process was endothermic from thermodynamic parameters. The pseudo second-order model more fit (R 2 =0.999) than the pseudo first-order model (R 2 =0.985) from studying the kinetic parameters. The experimental data fit with Freundlich isotherm (R 2 close to 1). This results indicated that Delonix regia is available agricultural, low cost and environment friendly biosorbent for removing the Pb 2+ ions.

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“…The solution was agitated for 120 min and the residual sulfate ion in solutions was determined, also the distribution of chloride ion depends upon pH of the solution were studied (Malakootian et al 2011). …”

Section: Effect Of Ph Value On Sulfate Adsorptionmentioning

confidence: 99%

Study the adsorption of sulfates by high cross-linked polystyrene divinylbenzene anion-exchange resin

et al. 2014

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In response to rising concerns about the effect of sulfate on water quality, human health, and agriculture, many jurisdictions around the world are imposing tighter regulations for sulfate discharge. This is driving the need for environmental compliance in industries like mining, metal processing, pulp and paper, sewage treatment, and chemical manufacturing. The sulfate removal from synthetic water by high cross-linked polystyrene divinylbenzene resin was studied at batch experiments in this study. The effect of pH, contact time, sulfates concentration, and adsorbent dose on the sulfate sequestration was investigated. The optimum conditions were studied on Saline water as a case study. The results showed that with increasing of the absorbent amount; contact time, and pH improve the efficiency of sulfate removal. The maximum sulfates uptake was obtained in pH and contact time 3.0 and 120 min, respectively. Also, with increasing initial concentration of sulfates in water, the efficiency of sulfate removal decreased. The obtained results in this study were matched with Freundlich isotherm and pseudo-secondorder kinetic. The maximum adsorption capacity (Qm) and constant rate were found 0.318 (mg/g) and 0.21 (mg/ g.min), respectively. This study also showed that in the optimum conditions, the sulfate removal efficiency from Saline water by 0.1 mg/L sulfates was 65.64 %. Eventually, high cross-linked polystyrene divinylbenzene resin is recommended as a suitable and low cost absorbent to sulfate removal from aqueous solutions.

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Fluoride removal using Regenerated Spent Bleaching Earth (RSBE) from groundwater: Case study on Kuhbonan water

Cited by 44 publications

References 22 publications

Use of bauxite from active Iranian mines for the removal of fluoride from drinking water

Use of bauxite from active Iranian mines for the removal of fluoride from drinking water

Removal of Toxic Pb(II) Ions from Aqueous Solution by Nano Sized Flamboyant Pod (Delonix regia)

Study the adsorption of sulfates by high cross-linked polystyrene divinylbenzene anion-exchange resin

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