Fluoride removal by adsorption on thermally treated lateritic soils

Gomoro, Kefyalew; Zewge, Feleke; Hundhammer, B.; Megersa, Negussie

doi:10.4314/bcse.v26i3.5

Cited by 31 publications

(27 citation statements)

References 20 publications

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“…solution (extracted from eggshell). The pH effect on fluoride removal is similar to what is observed for fluoride adsorption onto various adsorbents such as laterite (Gomoro et al 2012), rice husk (Mondal et al 2012b) and tea residue ash (Mondal et al 2012a). Bearing in mind, that for The latter mechanism could also explain the fluoride adsorption capacity in a neutral medium (Eq.…”

Section: Effect Of Phsupporting

confidence: 60%

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Bhaumik

Mondal

2014

Appl Water Sci

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The present work highlighted the effective application of banana peel dust (BPD) for removal of fluoride (F -) from aqueous solution. The effects of operating parameters such as pH, initial concentration, adsorbent dose, contact time, agitation speed and temperature were analysed using response surface methodology. The significance of independent variables and their interactions were tested by the analysis of variance and t test statistics. Experimental results revealed that BPD has higher Fadsorption capacity (17.43, 26.31 and 39.5 mg/g). Fluoride adsorption kinetics followed pseudo-second-order model with high correlation of coefficient value (0.998). On the other hand, thermodynamic data suggest that adsorption is favoured at lower temperature, exothermic in nature and enthalpy driven. The adsorbents were characterised through scanning electron microscope, Fourier transform infrared spectroscopy and point of zero charges (pH ZPC ) ranges from pH 6.2-8.2. Finally, error analysis clearly demonstrates that all three adsorbents are well fitted with Langmuir isotherm compared to the other isotherm models. The reusable properties of the material support further development for commercial application purpose.

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Section: Effect Of Phsupporting

confidence: 60%

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Bhaumik

Mondal

2014

Appl Water Sci

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“…Several methods including photocatalysis, electrocoagulation, biological treatment and disinfection are employed for pesticide removal [9][10][11][12]. However, these processes are somehow known to be in most cases limited, to use a long procedure or to be costly.…”

Section: Introductionmentioning

confidence: 99%

Removal of imidacloprid using activated carbon produced from ricinodendron heudelotii shells

Urbain¹,

Fodjo²,

Ardjouma³

et al. 2018

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, Ricinodendron heudelotii (akpi) shells are used as precursor to prepare activated carbon via chemical activation using phosphoric acid. The characterization of the obtained activated carbon is performed using X-ray diffraction (XRD), Boehm titration method and adsorption of acetic acid. The results show that the prepared activated carbon has a microstructure and a higher specific surface area (1179 m 2 /g), suggesting that the acid treatment has a significant positive influence on its sorption properties. The maximum adsorption capacity and pollutant elimination efficiency are found to be 43.48 mg/g and 90%, respectively. These results suggest that this low cost agent is an efficient tool to remove organic pollutants especially imidacloprid from wastewater.

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“…The rate of adsorption of fluoride ions in the water onto 2 g up to 10 g of activated clay soil increased steadily (Table 3). This can be explained by the fact that an increase in mass of the adsorbent goes hand in hand with a corresponding increase in surface active fluoride adsorption sites [16]. Defluoridation capacity of the activated clay soil at 10 g was the highest (Figure 2).…”

Section: Minimum Amount Of Calcinated Soil Giving Optimum Defluoridationmentioning

confidence: 97%

Use of Activated Red Clay Soil from Kiteto District, Tanzania, as a Remedial Method for High Fluoride Levels in Drinking Water

Othman¹

2014

IJSTS

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The fluoride levels in the water samples were determined potentiometrically using a fluoride ion selective electrode. Different experiments on remediation of fluoride containing water with activated clay soil were carried out. Studies on effect of calcination temperature on activation of clay, minimum amount of calcinated clay soil giving optimum defluoridation, effect of contact time for optimal defluoridation and reusing activated soil for defluoridation of water were performed. The best activation temperature for the red clay soil from Kiteto District was found to be 700 °C. For best results, the clay should be heated at this temperature for 3 hours, allowed to cool then used. The optimum water defluoridation contact time was found to be 8 hours. It was established that for 100 mL of fluoridated water with 4.59 mg-F L-1 , a minimum of 10 g of calcinated clay soil was required to reduce the concentration of fluoride ions to ≤1.1 mg-F L-1 which is well below the WHO recommended level of 1.5 mg-F L-1 for potable drinking water. The results also showed that the activated red clay soil can be repeatedly dried and re-used for the defluoridation process for a maximum of four times. It is recommended that the local red clay soil properly activated as described be used for the defluoridation of drinking water from Kiteto district, Tanzania. Investigation of possible usage of the activated clay soil for defluoridation of drinking water of other areas in the country is advocated.

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Fluoride removal by adsorption on thermally treated lateritic soils

Cited by 31 publications

References 20 publications

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

Removal of imidacloprid using activated carbon produced from ricinodendron heudelotii shells

Use of Activated Red Clay Soil from Kiteto District, Tanzania, as a Remedial Method for High Fluoride Levels in Drinking Water

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