Tea waste biomass activated carbon electrode for simultaneous removal of Cr(VI) and fluoride by capacitive deionization

Gaikwad, Mahendra S.; Balomajumder, Chandrajit

doi:10.1016/j.chemosphere.2017.06.074

Cited by 105 publications

(19 citation statements)

References 54 publications

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“…They proposed adsorption-coupled reduction as the most plausible mechanism for Cr(VI) removal by magnetic tea waste referring to physical adsorption, electrostatic interaction, reduction, ion exchange, surface complexation but further research is needed to illustrate the conclusive mechanism. In addition to the direct applications, tea waste has also been used to activate carbon electrode for simultaneous removal of Cr(VI) and fluoride [99] and to develop biochar for efficient Cd removal from aqueous solution [100] for efficient metal removal.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Agricultural biomass/waste as adsorbents for toxic metal decontamination of aqueous solutions

Anastopoulos

Pashalidis

Hosseini-Bandegharaei

et al. 2019

Journal of Molecular Liquids

150

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Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Agricultural biomass/waste as adsorbents for toxic metal decontamination of aqueous solutions

Anastopoulos

Pashalidis

Hosseini-Bandegharaei

et al. 2019

Journal of Molecular Liquids

150

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“…Thus, it is important to understand the nature of the electrode materials surface by determining the potential of zero charge and zeta potential for the better improvement of CDI performance. Gaikwad & Balomajumder (2017b), investigated the feasibility of AC derived from tea waste biomass (TWBAC) for defluoridation and hexavalent chromium removal simultaneously via CDI. The obtained highest electrosorption capacity of the prepared TWBAC towards F À was 0.74 mg/g (85.20%) and 2.49 (28.52%) at 10 and 100 mg/L F À initial concentration respectively at a cell potential of 1.2 V. The results showed that the prepared TWBAC is more favorable for chromium (Cr À ) adsorption over F À in the mixed feed solution (Figure 1) due to the difference in hydrated radius and valence as the hydrated radius of F À is smaller than that of Cr (VI), also the electrosorption selectivity of multivalent anions is higher than that of monovalent (Li et al 2016).…”

Section: Carbon-based Materialsmentioning

confidence: 99%

“…waste biomass for defluoridation and Cr À removal was investigated by Gaikwad & Balomajumder (2017b), (Figure 4(a)). The maximum F À removal capacity observed at 100 mg/L was 2.49 mg/L which was 3.4 times higher than the electrosorption capacity achieved for 10 mg/L.…”

Section: Initial Fluoride Concentrationmentioning

confidence: 99%

“…Figure 1 | Comparison of the electrosorption capacity of FÀ and Cr (VI). Reprinted from(Gaikwad & Balomajumder 2017b), copyright (2017), with permission from Elsevier.…”

mentioning

confidence: 99%

“…Figure4| (a) A plot of feed concentration versus electrosorption capacity. Reprinted from(Gaikwad & Balomajumder 2017b), copyright (2017), with permission from Elsevier (b) Electrosorption capacities of NiCoAl-LMO/rGO with different concentrations of NaF solution. Reprinted (adapted) with permission from(Li et al 2019).…”

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confidence: 99%

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Capacitive deionization: a promising technology for water defluoridation: a review

2021

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Capacitive deionization (CDI) is among the promising technologies employed for water purification. CDI has been studied for the removal of various ionic species from water including fluoride ion (F−) with promising results. However, there is no comprehensive literature that summarizes the use of CDI for water defluoridation applications. Therefore, this review paper critically analyzes different electrode materials that have been studied for water defluoridation, their electrosorption capacities and F− removal efficiencies. It further discussed the parameters that influence CDI efficiency during defluoridation and point out the issues of F− selectivity when coexisting with other ions in the solution. We can conclude that different electrode materials have shown different abilities in electrosorption of F−. The carbon-based materials possess high surface area and good electrical conductivity which is paramount for ion adsorption but lack selectivity for F− removal. Metal oxides and hydroxides have been reported with improved electrosorption capacity and high selectivity to F− due to the ion exchange between the F− and the hydroxyls surface of the metal oxides/hydroxides. Apart from the good performance of these materials for defluoridation, the discovery of actual practicability use of the electrode materials for defluoridation for commercial scale is still a need.

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Conversion of Biowastes into Carbon‐based Electrodes

Feng¹,

Pu²

2022

High‐Performance Materials From Bio‐based Feedstocks

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Tea waste biomass activated carbon electrode for simultaneous removal of Cr(VI) and fluoride by capacitive deionization

Cited by 105 publications

References 54 publications

Agricultural biomass/waste as adsorbents for toxic metal decontamination of aqueous solutions

Agricultural biomass/waste as adsorbents for toxic metal decontamination of aqueous solutions

Capacitive deionization: a promising technology for water defluoridation: a review

Conversion of Biowastes into Carbon‐based Electrodes

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