Defluoridation of water by activated carbon prepared from banana (Musa paradisiaca) peel and coffee (Coffea arabica) husk

Tilahun, Getachew; Hussen, Ahmed; Rao, V. M.

doi:10.1007/s13762-014-0545-8

Cited by 109 publications

(37 citation statements)

References 22 publications

(28 reference statements)

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“…General dependency is followed on the graphs, that along with lowering of the pH, adsorption capacity increases. These interdependence is consistent with literature reports describing the adsorption processes of fluoride ions removal by using activated carbon [33][34][35]. According to the speciation diagram, describing the contribution of individual fluorides forms in aqueous solutions of various pH, it was concluded that undissociated fluoride forms as weak hydrofluoric acid particles are dominated in a low pH.…”

Section: Resultssupporting

confidence: 90%

Adsorptive Purification of Aqueous Solution from Fluoride Ions by Carbonaceous Materials

Gąsior¹

2016

Eng. Prot. Environ.

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Fluoride is a widely available element and is the 13 th on the list of most common elements in nature. Fluorides are present in all environmental components: water, soil, air and living organisms. It finds its way into water as a result of rocks weathering and leaching, as well as precipitation along with gas and dust pollution of anthropogenic origin. In more and more areas of Poland exceedances are observed, relative to the maximum permitted levels established for fluoride concentration. The level of environmental pollution by fluoride ions increases along with the development of industrial activity of humans and the widespread use of fluorine compounds in agriculture and dental prophylaxis. Currently fluorine compounds are recognized as one of the most dangerous pollutants, contributing to environmental contamination. Fluoride ions can be removed from aqueous mediums using membrane techniques, adsorption, chemical precipitation, coagulation, electrocoagulation or ion exchange. Using adsorption processes is a very good method for water purification from fluoride ions due to its high effectiveness and simple application. The aim of this paper was to research fluoride ion adsorption statics and kinetics for two commercially available carbon materials: activated carbon (W1) and charcoal (W2). Adsorption tests were conducted in static conditions. Concentrations of fluoride ions in the samples were analyzed using the ion chromatography method. The adsorption kinetic occurred according to the pseudo-secondorder kinetic model. Process equilibrium was achieved after 40 minutes of contact between the adsorbent and the adsorbtive when using W1 and after an hour when using W2. Equilibrium adsorption was described using Freundlich's equations. Freundlich isotherms were characterized by large correlation coefficients (R 2 > 0.92). Adsorption capacities of both materials strongly depended on the pH solution. The highest adsorption capacities for both activated carbon (0.199 mg/g) and charcoal (0.169 mg/g) was observed where the initial pH = 2 and the 20 mg/L fluoride concentration. The efficiency of fluoride ions removal from aqueous solutions depended on the process conditions, the initial fluoride concentration, pH, companion ions presence, for example OH -. The greatest adsorption efficiency (51.9% for a 5 mg/L initial concentration) was exhibited by charcoal.

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Section: Resultssupporting

confidence: 90%

Adsorptive Purification of Aqueous Solution from Fluoride Ions by Carbonaceous Materials

Gąsior¹

2016

Eng. Prot. Environ.

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“…Therefore, it is concluded that the adsorption of fluoride by these adsorbents follows the pseudo-second-order reaction kinetics. This result is in agreement with the results obtained for the defluoridation using banana peel and coffee husk (Getachew et al 2014). …”

Section: Chemical Kineticssupporting

confidence: 92%

Sorption of fluoride using chemically modified Moringa oleifera leaves

Dan

Chattree

2018

Appl Water Sci

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Contamination of drinking water due to fluoride is a severe health hazard problem. Excess of fluoride (> 1.5 mg/L) in drinking water is harmful to human health. Various treatment technologies for removing fluoride from groundwater have been investigated. The present study showed that the leaves of Moringa oleifera, a herbal plant is an effective adsorbent for the removal of fluoride from aqueous solution. Acid treated Moringa oleifera leaves powder showed good adsorption capacity than alkali treated Moringa oleifera leaves powder. Batch sorptive defluoridation was conducted under the variable experimental condition such as pH, contact time, adsorbent dose and initial fluoride ion concentration. Maximum defluoridation was achieved at pH 1. The percentage of fluoride removal increases with adsorbent dose. The equilibrium sorption data were fitted into Langmuir, Freundlich and Temkin isotherms. Of the three adsorption isotherms, the R 2 value of Langmuir isotherm model was the highest. The maximum monolayer coverage (Q max ) from Langmuir isotherm model was determined to be 1.1441 mg/g, the separation factor indicating a favorable sorption experiment is 0.035. It was also discovered that the adsorption did not conform to the Freundlich adsorption isotherm. The heat of sorption process was estimated from Temkin Isotherm model to be − 0.042 J/mol which vividly proved that the adsorption experiment followed a physical process.

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“…Coffee husk (CH) is a fibrous mucilaginous sub-product of coffee dry processing 21 and represents about 50% of the coffee bean weight 22 . Due to the presence of caffeine, tannins and other organic compounds, coffee husk is toxic for feeding, but has been used as fertilizer, stall bedding, flux in ceramic tiles, biomass and for water purification [22][23][24][25] . However, as world's annual coffee production is about 8.5 tons, only a small fraction of available coffee husk is used for these listed applications 26 .…”

Section: Introductionmentioning

confidence: 99%

Biodegradation Study of a Novel Poly-Caprolactone-Coffee Husk Composite Film

et al. 2016

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Plastic disposal is a worldwide issue due to its long degradation time. Environmentally degradable polymers (EDPs) have received considerable attention because of their faster degradation. However, the use of EDPs is limited by high cost and restricted properties. The incorporation of organic fillers is an alternative to reduce cost while increasing biodegradation. Poly-caprolactone (PCL) is a biodegradable polyester compatible with organic fillers. Coffee husk (CH) is a sub-product of coffee processing with potential use as organic filler. We prepared a novel PCL-CH composite film and investigated the effects of CH incorporation on the biodegradation of PCL. Biodegradation study was carried out in soil for 120 days, and evaluated by weight loss measurements. Additionally, soil microbiological and granulometric analyses were performed. Bacteria and fungi were found in the soil that was classified as sandy. The composite film degraded twice faster than PCL film probably due to the adhesion of microorganisms on the coffee husk.

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Defluoridation of water by activated carbon prepared from banana (Musa paradisiaca) peel and coffee (Coffea arabica) husk

Cited by 109 publications

References 22 publications

Adsorptive Purification of Aqueous Solution from Fluoride Ions by Carbonaceous Materials

Adsorptive Purification of Aqueous Solution from Fluoride Ions by Carbonaceous Materials

Sorption of fluoride using chemically modified Moringa oleifera leaves

Biodegradation Study of a Novel Poly-Caprolactone-Coffee Husk Composite Film

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