Defluoridation studies using active carbon derived from the barks of Ficus racemosa plant

Ravulapalli, Sujitha; Ravindhranath, K.

doi:10.1016/j.jfluchem.2016.11.013

Cited by 78 publications

(27 citation statements)

References 29 publications

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“…The contribution of carbon and oxygen elements in the activated biochar represents a percentage above 80%. Similar results were obtained byRavulapalli and Kunta (2017) with an adsorbent produced of Ficus racemosa peel. The high percentage of these elements confirms the carbonaceous characteristic of agricultural by-product adsorbents.…”

supporting

confidence: 85%

Production and Characterization of Activated Biochar of Cássia Fistula L. Leaves

Tomassoni

Schneider

Giroletti

et al. 2020

R. gest. sust. ambient.

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A new activated biochar was produced by carbonizing Cássia fistula L. leaves and its characterization was performed. Scanning Electron Microscopic (SEM) images of the activated biochar showed morphology with numerous irregular cavities and pores. BET surface area and total pore volume of produced adsorbent were 192 m².g-1 and 0.108 cm3.g-1, respectively. Mean porous diameter of the produced biochar was 2.263 nm, characterizing a mesoporous material. Crystallinity and functional groups of the adsorbent were determined by X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy analyses, respectively. The pH of zero charge point (pHzcp) observed was equal to 10, demonstrating that the activated biochar has a negative surface, which facilitates the adsorption of positively charged compounds in water and wastewater treatment. Tree leaves of Cássia fistula L. represent a promising raw material for activated biochar production, given their availability and characteristics of the adsorbent produced. The use of tree leaves for activated biochar production can reduce the operational costs of adsorption process, besides providing the use of a residue for a more noble purpose.

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supporting

confidence: 85%

Production and Characterization of Activated Biochar of Cássia Fistula L. Leaves

Tomassoni

Schneider

Giroletti

et al. 2020

R. gest. sust. ambient.

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“…Likely, a study obtaining carbon from the barks of ficus racemosa reveals the greatest affinity of carbon precursor toward fluoride ions, also called "Active carbon derived from the barks of Ficusracemosa" (ACBFR) (Ravulapalli and Kunta 2017). The optimum pH for the fluoride removal was 7.0; beyond, a fall in the removal was observed, because a negative adsorption was featured by the lesser concentration of fluoride ions than that present in the bulk.…”

Section: Activated Carbonmentioning

confidence: 99%

Treatment of fluoride-contaminated water. A review

Kumar¹,

Suganya²,

Srinivas³

et al. 2019

Environ Chem Lett

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Delivering the right amount of fluoride to drinking water protects the teeth from decay and reduces the risk of cavities. Nonetheless, fluorosis has been diagnosed as the result of excessive exposure of fluoride, which induces brain impairment, muscle disorders and hyperactivity. Fluoride ingestion during the formation of the tooth enamel is the main reason for fluorosis, which is characterized by hypomineralization. Dissolution of fluoride-containing rock minerals contributes to naturally occurring fluoride contamination in water. The intentional addition of fluoride to water in dental care is alarming in growing countries such as India. This article reviews the origin of fluoride, the analysis of fluoride derivatives and the technologies to remove fluoride from water. The manuscript presents adsorption techniques for fluoride removal, using different types of adsorbents. The adsorption capacities of adsorbents under various conditions, such as contaminant concentration, adsorbent dosage, time, pH and temperature, are presented. Adsorbent types include alumina, zeolites, organic waste, shell-based and carbon-based including graphite and carbon nanotubes. Defluoridation of water using clays and muds, modified activated alumina, chitosan derivatives and composites are also discussed.

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“…Adsorption kinetics: The adsorption kinetics are studied using pseudo-first and second-order models, intraparticle diffusion model and Elovich equations [28,29]. As per R 2 values, adsorption kinetics follows the order: pseudo second-order (0.9994) > pseudo first-order (0.9967) > interparticle diffusion model (0.9683) > Elovich model (0.922) in the case of NAHCSC; and pseudo second-order (0.9998) > pseudo first-order (0.9843) > Elovich (0.9694) > intraparticle diffusion model (0.9358) in the case of NALABC (Table-2).…”

Section: Effect Of Phmentioning

confidence: 99%

Effective Activated Carbon as Adsorbent for the Removal of Copper(II) Ions from Wastewater

2019

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Nitric acid activated carbons prepared from the barks of Limonia acidissima plant (NALABC) and stems of Hibiscus cannabinus plant (NAHCSC) are investigated as adsorbents for the removal of Cu(II) ions from waste water using batch methods of extraction. Various extraction conditions namely, pH, time of equilibration, sorbent concentration, initial concentration of Cu(II) ions and temperature, are optimized for the maximum removal. Substantial amounts of Cu(II) are extracted in the pH range: 3 to 9 and adsorption capacities are 19.6 mg/g for NALABC and 29.4 mg/g for NAHCSC, which are more than many active carbons developed in the previous works. It is interesting to note that the adsorbents are effective in acidic, neutral and also in basic conditions of the water samples and thus paving the way for applying these adsorbents in wide pH ranges of diverse samples. Five-fold excess of common co-ions that are normally present in water, have marginally affected the % removal. Thermodynamic parameters are evaluated for the spontaneity and nature of adsorption processes. The adsorption phenomenon is analyzed using Langmuir and Freundlich isotherm models and noted that Langmuir isotherm model suits better indicating the uniform and mono-layer nature of adsorption. Kinetics of adsorption is analyzed and found that pseudo second-order kinetics preferably explains the adsorption of Cu(II). The spent NALABC and NAHCSC can be regenerated and subsequently used. The adsorbents developed are found to be effective in removing Cu(II) ions from the real water samples collected from polluted lakes and copper based industries.

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Defluoridation studies using active carbon derived from the barks of Ficus racemosa plant

Cited by 78 publications

References 29 publications

Production and Characterization of Activated Biochar of Cássia Fistula L. Leaves

Production and Characterization of Activated Biochar of Cássia Fistula L. Leaves

Treatment of fluoride-contaminated water. A review

Effective Activated Carbon as Adsorbent for the Removal of Copper(II) Ions from Wastewater

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