Preparation and characterization of charcoals that contain dispersed aluminum oxide as adsorbents for removal of fluoride from drinking water

Tchomgui-Kamga, Eric; Alonzo, V.; Nanseu‐Njiki, Charles Péguy; Audebrand, Nathalie; Ngameni, Emmanuel; Darchen, André

doi:10.1016/j.carbon.2009.09.034

Cited by 197 publications

(68 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, the carbon content present in hydrochar-based activated carbon (BEFBAC) was mainly amorphous in texture. This result was expected, as amorphous materials show better absorbance due to their high surface area and greater number of active sites (Tchomgui-Kamga et al 2010). Previous findings also demonstrated the presence of amorphous carbon in coconut coir-based activated carbon (Sharma and Gode 2010).…”

Section: Characterizationsupporting

confidence: 52%

Hydrothermally Treated Banana Empty Fruit Bunch Fiber Activated Carbon for Pb(II) and Zn(II) Removal

Adebisi¹,

Chowdhury²,

Hamid³

et al. 2016

BioResources

View full text Add to dashboard Cite

Activated carbon was produced by chemical activation of hydrothermally carbonized (HTC) banana empty fruit bunch (BEFB), using phosphoric acid (H3PO4) as the activating agent. The activation process was optimized using a Box-Behnken factorial design (BBD), with an outcome of 17 different experiments under the predefined conditions. Three different parameters (activation temperature (x1), activation time (x2), and the concentration of activating acid (x3)) were analyzed with respect to their influence on maximum adsorption percentage for divalent cations, Pb(II) (Y1) and Zn(II) (Y2), and carbon yield (Y3). All process parameters had strong positive effects on adsorption capacity up to a certain limit. The specific surface area of the hydrochar (HTC) was enhanced substantially after the activation process. Scanning electron microscopy (SEM) revealed that the morphology of the BEFB-based char changed noticeably after the acid impregnation and activation process. The Langmuir maximum monolayer adsorption capacity for Pb (II) and Zn (II) cations was 74.62 mg/g and 77.51 mg/g, respectively. Equilibrium isotherm data were in agreement with the Langmuir model. Thermodynamic characterization revealed that the equilibrium system was endothermic and spontaneous.

show abstract

Section: Characterizationsupporting

confidence: 52%

Hydrothermally Treated Banana Empty Fruit Bunch Fiber Activated Carbon for Pb(II) and Zn(II) Removal

Adebisi¹,

Chowdhury²,

Hamid³

et al. 2016

BioResources

View full text Add to dashboard Cite

show abstract

“…In addition, previous research found the existence of an amorphous C in the activated carbon prepared from coconut coir (Sharma and Gode 2010). Generally, amorphous materials as adsorbents would be better due to their high specific surface area and more active sites on their surfaces (Tchomgui-Kamga et al 2010).…”

Section: Xrd Analysismentioning

confidence: 98%

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

Sun

Tang

Gong

et al. 2015

Environ Sci Pollut Res

179

View full text Add to dashboard Cite

Hydrochars produced from different feedstocks (sawdust, wheat straw, and corn stalk) via hydrothermal carbonization (HTC) and KOH modification were used as alternative adsorbents for aqueous heavy metals remediation. The chemical and physical properties of the hydrochars and KOH-treated hydrochars were characterized, and the ability of hydrochars for removal of heavy metals from aqueous solutions as a function of reaction time, pH, and initial contaminant concentration was tested. The results showed that KOH modification of hydrochars might have increased the aromatic and oxygen-containing functional groups, such as carboxyl groups, resulting in about 2-3 times increase of cadmium sorption capacity (30.40-40.78 mg/g) compared to that of unmodified hydrochars (13.92-14.52 mg/g). The sorption ability among different feedstocks after modification was as the following: sawdust> wheat straw > corn stack. Cadmium sorption kinetics on modified hydrochars could be interpreted with a pseudo-second order, and sorption isotherm was simulated with Langmuir adsorption model. High cadmium uptake on modified hydrochars was observed over the pH range of 4.0-8.0, while for other heavy metals (Pb(2+), Cu(2+), and Zn(2+)) the range was 4.0-6.0. In a multi-metal system, the sorption capacity of heavy metals by modified hydrochars was also higher than that by unmodified ones and followed the order of Pb(II) > Cu(II) > Cd(II) > Zn(II). The results suggest that KOH-modified hydrochars can be used as a low cost, environmental-friendly, and effective adsorbent for heavy metal removal from aqueous solutions.

show abstract

“…Adsorption is considered an appropriate technique for small community water source defluoridation compared to other techniques (Mohapatra et al 2009). As a result, adsorption is frequently used as a robust technique to remove water soluble ions and an attractive method for the removal of fluoride in terms of low cost, simplicity of design, and operation (Tchomgui-Kamga et al 2010a;Miretzky and Cirelli 2011). Nevertheless, the applicability of low-cost adsorbents is limited either due to their low removal capacity or lack of public acceptance.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, scientists suggested composite metal oxide as effective adsorbent for fluoride removal (Tchomgui-Kamga et al 2010a;Sun et al 2011;Tomar and Kumar 2013) and the U.S. Patent Trademark Office approved such novel approaches (Yang et al 2010). Iron ore is a mixture of different metal oxides responsible for the removal of fluoride and is one of the most abundant and cheap materials available anywhere in the Rift Valley.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

et al. 2014

View full text Add to dashboard Cite

High concentrations of fluoride in drinking water is a public health concern globally and of critical importance in the Rift Valley region. As a low-cost water treatment option, the defluoridation capacity of locally available iron ore was investigated. Residence time, pH, agitation rate, particle size of the adsorbent, sorbent dose, initial fluoride concentration and the effect of co-existing anions were assessed. The sorption kinetics was found to follow pseudo-first-order rate and the experimental equilibrium sorption data fitted reasonably well to the Freundlich model. The sorption capacity of iron ore for fluoride was 1.72 mg/g and the equilibrium was attained after 120 min at the optimum pH of 6. The sorption study was also carried out at natural pH conditions using natural ground water samples and the fluoride level was reduced from 14.22 to 1.17 mg/L (below the WHO maximum permissible limit). Overall, we concluded that iron ore can be used in water treatment for fluoride removal in the Rift Valley region and beyond.

show abstract

Preparation and characterization of charcoals that contain dispersed aluminum oxide as adsorbents for removal of fluoride from drinking water

Cited by 197 publications

References 39 publications

Hydrothermally Treated Banana Empty Fruit Bunch Fiber Activated Carbon for Pb(II) and Zn(II) Removal

Hydrothermally Treated Banana Empty Fruit Bunch Fiber Activated Carbon for Pb(II) and Zn(II) Removal

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

Experimental evaluation of sorptive removal of fluoride from drinking water using iron ore

Contact Info

Product

Resources

About