Hydrothermal synthesis of a mineral-substituted hydroxyapatite nanocomposite material for fluoride removal from drinking water

Nagaraj, Ammavasi; Munusamy, Murugan A.; Ahmed, Mukhtar; Kumar, Suresh; Rajan, Mariappan

doi:10.1039/c8nj02401d

Cited by 40 publications

(13 citation statements)

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“…The values of Δ H ° were positive, which highlighted that the chromium adsorption was endothermic in nature. Furthermore, the positive values of Δ S ° indicated the good binding affinity of the synthesized adsorbents with chromium ions and increased randomness at the adsorbent–adsorbate interface during the adsorption process …”

Section: Resultsmentioning

confidence: 99%

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

et al. 2018

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New functional ionic liquid (IL) capped graphene quantum dot (GQD) was synthesized as an adsorbent for the removal of toxic heavy metal chromium(VI) ion (Cr 6+ ). The physicochemical properties of the adsorbent (IL-GQD) were investigated by Fourier transform infrared, Xray diffraction, atomic force microscopy, Raman, scanning electron microscopy, energy dispersive X-rays, and transmission electron microscopy analyses. The adsorption parameters, namely equilibrium time, solution pH, competing co-ions, dosage, and initial chromium concentration, were optimized for maximum Cr 6+ adsorption. The maximum adsorption capacity reached 934.62 mg/g at 40 min in neutral pH; this is much better than most of the other adsorbents reported earlier. In addition, the effect of pH in solution was investigated in the range of 3.0−12.0. The result showed that the lower pH value was found to favor the adsorption. The adsorption kinetics and isotherms fitted well with Langmuir isotherm model and pseudo-second-order kinetic model. The thermodynamic studies indicated that the chromium adsorption process followed a spontaneous and endothermic model. This new functionalization of ionic liquid moieties into graphene quantum dot provides excellent results for the removal of toxic Cr 6+ . This can be utilized for field applications to reduce the chromium concentration to below the tolerance limit (>0.05 mg L −1 ).

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Section: Resultsmentioning

confidence: 99%

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

et al. 2018

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“…This can be additionally studied by the point of zero charge (pHzpc). 39 From Fig. 10b, the pHzpc for the adsorbents CeBC-A@CS, LaBC-A@CS and AlBC-A@CS is 7.1.…”

Section: Effect Of Phmentioning

confidence: 90%

Dicarboxylic acid cross-linked metal ion decorated bentonite clay and chitosan for fluoride removal studies

et al. 2020

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“…e removal of fluoride from aqueous media using lanthanum and cerium modified mesoporous alumina (La/MA and Ce/MA) was studied, and it was found that the maximum adsorption capacity of La/MA was 26.45 mg/g, and the capacity of La/ MA was more than Ce/MA and mesoporous alumina [46]. One study showed that the fluoride removal efficiency of the mineral-substituted hydroxyapatite nanocomposite (mHAp) adsorbent is 93% [47]. Another study by Dubey et al demonstrated that the maximum adsorption of fluoride by using NPs of gamma alumina and alcoholic aluminum chloride was 23 mg/g [48].…”

Section: Nanoparticles (Nps)mentioning

confidence: 99%

Comparison of Water Defluoridation Using Different Techniques

Fadaei

2021

International Journal of Chemical Engineering

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Fluoride pollution in subsurface water is a significant problem for different nations across the world because of the intake of excessive fluoride caused by the drinking of the contaminated subsurface. Water pollution by flouride can be attributed to the natural and human-made agents. Increased levels of fluoride in drinking water may result in the irretrievable demineralization of bone and tooth tissues, a situation called fluorosis, and other disorders. There has long been a need for fluoride removal from drinking water to make it safe for human use. Among the various fluoride removal methods, adsorption is the method most popularly used due to its cheap cost, ease of utilization, and being a scalable and simple physical technique. According to the findings of this study, the highest concentration of fluoride (0.1–15.0 mg/L) was found in Sweden and the lowest (0.03–1.14 mg/L) in Italy. We collected the values of adsorption capacities and fluoride removal efficiencies of various types of adsorbents from valuable released data accessible in the literature and exhibited tables. There is still a need to find the actual possibility of using biosorbents and adsorbents on a commercial scale and to define the reusability of adsorbents to decrease price and the waste generated from the adsorption method. This article reviews the currently available methods and approaches to fluoride removal of water.

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Hydrothermal synthesis of a mineral-substituted hydroxyapatite nanocomposite material for fluoride removal from drinking water

Abstract: Mineral substituted hydroxyapatite (mHAp) nanocomposite was synthesized and it shows high fluoride adsorption capacity.

Cited by 40 publications

References 41 publications

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

Functional Ionic Liquid-Capped Graphene Quantum Dots for Chromium Removal from Chromium Contaminated Water

Dicarboxylic acid cross-linked metal ion decorated bentonite clay and chitosan for fluoride removal studies

Comparison of Water Defluoridation Using Different Techniques

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