Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Suneetha, M.; Sundar, B. Syama; Ravindhranath, K.

doi:10.1186/s40543-014-0042-1

Cited by 88 publications

(42 citation statements)

References 112 publications

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“…The mass ratio of KOH/fish bladder carbon (FBPC) was 1:1, 2:1 and 3:1. Dry KOH/FBPC was then activated between 400˚C and 700˚C for a period of 1 h in a tube furnace under nitrogen [24]. After, the samples were washed with 1 M HCl and distilled water until neutral pH and dried 60˚C for 24 h. The activated are hereafter labeled X-FBPC-1, 2, or 3 as presented in Table 1.…”

Section: Preparation Of Fish Swim Bladder-derived Porous Carbonmentioning

confidence: 99%

“…Percent fluoride removal analysis: The percentage of fluoride removed and total amount adsorbed (mg/g) was calculated using Equations (1) and (2), respectively [24].…”

Section: Materials Characterization and Fluoride Removal Studiesmentioning

confidence: 99%

“…This therefore favors adsorption of fluoride ions through coulombic attraction [24]. At very low pH values fluoride ion adsorption is unfavorable since fluoride ions convert to neutral hydrogen fluoride (HF has a pKa of 3.18) which hinders anion exchange.…”

Section: Effect Of Phmentioning

confidence: 99%

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Fish Swim Bladder-Derived Porous Carbon for Defluoridation at Potable Water pH

Karuga¹,

Jande²,

Kim³

et al. 2016

ACES

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The levels of fluoride in various ground water sources in East Africa are above the World Health Organization upper limit of 1.5 mg/L. Research on diverse defluoridation technologies has proven that adsorption stands out as an affordable, efficient, and facile technology. Fish swim bladder-derived porous carbon (FBPC) activated by KOH and surface oxidized by nitric acid was successfully investigated as an adsorbent for defluoridation at portable water pH. The FBPC was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-raydiffraction (XRD) and energy dispersive spectroscopy (EDS). Batch methods were used to study physiochemical parameters viz., initial fluoride concentration, temperature, adsorbate dosage, contact time and pH. Freundlich, Temkin, Langmuir and Dubinin-Radushkevich isotherms were plotted and analyzed to understand the adsorption process. Bangham, Weber Morris, pseudo first and second-order models were used to elucidate the kinetics of adsorption. Optimal conditions for fluoride removal were found to be: pH of 6, FBPC adsorbent dose of 5.0 g/L and contact time of 50 min. Flouride adsorption followed pseudo second-order kinetic model and Langmuir isotherm best describes the adsorption process.

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Section: Preparation Of Fish Swim Bladder-derived Porous Carbonmentioning

confidence: 99%

“…Percent fluoride removal analysis: The percentage of fluoride removed and total amount adsorbed (mg/g) was calculated using Equations (1) and (2), respectively [24].…”

Section: Materials Characterization and Fluoride Removal Studiesmentioning

confidence: 99%

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Fish Swim Bladder-Derived Porous Carbon for Defluoridation at Potable Water pH

Karuga¹,

Jande²,

Kim³

et al. 2016

ACES

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“…The kinetic of Cr (VI) adsorption on KOH-COP, some adsorption kinetic models, namely, pseudo-zero order adsorption kinetic model [4], pseudo-first-order adsorption kinetic model [4], pseudo-second order adsorption kinetic model [4], intraparticle diffusion model [5], Bangham's pore diffusion model [6], liquid film diffusion kinetic model [7], modified Freundlich kinetic model [8] and Elovich model [9] are investigated to describe the adsorbate uptake.…”

Section: B Kinetic Adsorption Modelsmentioning

confidence: 99%

“…The Bangham equation is presented to limit by the pore diffusion at different adsorption time by following [6]:…”

Section: B5 Bangham Pore Diffusion Modelmentioning

confidence: 99%

Kinetic Models on Chromium (VI) Adsorption onto Carbonized Oil Palm Kernel with Potassium Hydroxide Activation

2016

IJACEBS

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Abstract-Use of adsorption kinetic models for removal of chromium (VI) from aqueous solution by oil palm kernel with potassium hydroxide activation has been investigated. The adsorption capacity or amount of Cr(VI) adsorbed per unit mass of adsorbent was determined by the pseudo-zero order, pseudo-first order, pseudosecond order, intraparticle diffusion, Bangham pore diffusion, liquid film diffusion, modified Freundlich and Elovich models to describe the adsorption process. The kinetics data were marginally better fit with Elovich model as compared to other models. It is therefore suggest that the chemisorption was the rate controlling step for chromium (VI) adsorption onto the carbonized oil palm kernel with KOH activation as the adsorbent.

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Chemical Diversity and Medicinal Potential of Vitex negundo L.: From Traditional Knowledge to Modern Clinical Trials

Sharma,

Radha,

Kumar

et al. 2023

Chemistry & Biodiversity

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In recent times, there has been a resurgence of interest in V. negundo, with numerous ongoing clinical investigations exploring its therapeutic potential and the development of formulations derived from its bioactive constituents. Moreover, the market availability of homoeopathic medicines containing V. negundo highlights its enduring popularity. This review article provides a comprehensive analysis of V. negundo, encompassing its phytochemical composition, traditional uses, ethnomedicinal practices, and pharmacological properties. It explores the wealth of knowledge passed down through generations and the potential relevance of this traditional wisdom in modern healthcare. Additionally, the review presents findings from recent clinical trials, shedding light on the efficacy and safety of V. negundo‐based formulations in various therapeutic contexts. Furthermore, the review delves into the emerging application of nanoparticles in V. negundo‐based pharmaceutics, considering their potential to revolutionize drug delivery and formulation techniques. The incorporation of nanotechnology may enhance the bioavailability and targeted delivery of V. negundo's active compounds, further amplifying its medicinal potency. The amalgamation of traditional knowledge and contemporary scientific evidence underscores the relevance of V. negundo in the field of chemistry and biodiversity, paving the way for its continued exploration as a promising source of health‐promoting compounds.

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Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Cited by 88 publications

References 112 publications

Fish Swim Bladder-Derived Porous Carbon for Defluoridation at Potable Water pH

Fish Swim Bladder-Derived Porous Carbon for Defluoridation at Potable Water pH

Kinetic Models on Chromium (VI) Adsorption onto Carbonized Oil Palm Kernel with Potassium Hydroxide Activation

Chemical Diversity and Medicinal Potential of Vitex negundo L.: From Traditional Knowledge to Modern Clinical Trials

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