Defluoridation of water using Brushite: Equilibrium, kinetic and thermodynamic studies

Mourabet, M.; Boujaady, H. El; Rhilassi, A. El; Ramdane, H.; Bennani-Ziatni, M.; Hamri, R. El; Taïtaï, A.

doi:10.1016/j.desal.2011.05.068

Cited by 56 publications

(18 citation statements)

References 23 publications

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“…In acidic conditions, the decrease in adsorption capacity was caused by weak hydrofluoric acid. A similar observation was made by [177] on magnesium substituted hydroxyapatite absorbent at a pH below 3 by using different adsorbents as it was reported by [151,154,159,161].…”

Section: Effects Of Ph On Fluoride Removalsupporting

confidence: 67%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an indepth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F − ) removal by adsorption and the anions' characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.

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Section: Effects Of Ph On Fluoride Removalsupporting

confidence: 67%

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

John

David

Mmereki

2018

International Journal of Chemical Engineering

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“…The results of this analysis showed that the model is highly signicant at a probability level of p < 0.0001 (as shown in Table 4). 25 The recorded adequate precision value in this study was 34, which indicates the presence of an adequate signal to noise ratio. This suggests that the computed Fisher's variance ratio was signicant and has a high degree of adequacy for the quadratic model.…”

Section: Resultssupporting

confidence: 50%

Tuning N-methyl-d-glucamine density in a new radiation grafted poly(vinyl benzyl chloride)/nylon-6 fibrous boron-selective adsorbent using the response surface method

2015

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A new adsorbent containing boron-selective groups was prepared by radiation induced grafting of vinyl benzyl chloride (VBC) onto nylon-6 fibers followed by functionalisation with N-methyl-D-glucamine (NMDG). The density of glucamine loaded in the adsorbent was tuned by optimisation of the reaction parameters such as NMDG concentration, reaction temperature, reaction time and degree of grafting using response surface methodology (RSM) employing Box-Behnken design (BBD). The optimum parameters for achieving the maximum glucamine density (1.7 mmol g À1 ) in the adsorbent are 10.6%, 81 C, 47 min and 121% for the NMDG concentration, reaction temperature, reaction time and degree of grafting (DG), respectively. The deviation between the optimum experimental and predicted glucamine density is found to be 1.2% suggesting the reliability of RSM in predicting the yield and optimising the functionalisation reaction parameters. The chemical composition, morphology and structure of the NMDG-containing fibrous adsorbent were studied using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The thermal properties were determined using differential scanning calorimetry (DSC) and the thermal stability was evaluated by thermogravimetric analysis (TGA). Considering the physico-chemical properties of the fibrous adsorbent and the preliminary results of boron adsorption, it can be suggested that this adsorbent is a promising candidate for boron removal.

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“…Agilent Open LAB Chromatography Data Soware System® controlled the instrument. All data were obtained using a Phenomenex® Gemini C18 column (150 Â 4.6 mm, 5 mm), a mobile phase consisting of 0.05 mol L À1 phosphate buffer pH 6 and acetonitrile (65 : 35, v/v) at a ow rate of 1.2 mL min À1 at a wavelength of 355 nm at 25 C with an injection volume of 20 mL.…”

Section: Apparatusmentioning

confidence: 99%

Polyaniline-deposited cellulose fiber composite prepared via in situ polymerization: enhancing adsorption properties for removal of meloxicam from aqueous media

et al. 2017

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Defluoridation of water using Brushite: Equilibrium, kinetic and thermodynamic studies

Cited by 56 publications

References 23 publications

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

Tuning N-methyl-d-glucamine density in a new radiation grafted poly(vinyl benzyl chloride)/nylon-6 fibrous boron-selective adsorbent using the response surface method

Polyaniline-deposited cellulose fiber composite prepared via in situ polymerization: enhancing adsorption properties for removal of meloxicam from aqueous media

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