Structural modification of regenerated fuller earth and its application in the adsorption of anionic and cationic dyes

Beltran-Pérez, Oscar Dario; Hormaza-Anaguano, Angelina; Zuluaga-Diaz, Benjamin; Gallo, Santiago Alonso Cardona

doi:10.15446/dyna.v82n189.42954

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…16 When in a medium that has a pH higher than the PZC (pH medium > pH PZC ), the BC surface is said to possess a predominance of negative charge and vice versa. 17 The PZC gives an idea as to whether the surface functional groups (SFGs) are in their protonated or deprotonated form.…”

Section: Introductionmentioning

confidence: 99%

The influence of three acid modifications on the physicochemical characteristics of tea-waste biochar pyrolyzed at different temperatures: a comparative study

Peiris

Nayanathara²,

Navarathna

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

The influence of three acid modifications on the physicochemical characteristics of tea-waste biochar pyrolyzed at different temperatures: a comparative study

Peiris

Nayanathara²,

Navarathna

et al. 2019

RSC Adv.

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“…In common, the chemical and physical properties of clays can be altered to extend their normal capacity adsorbent and give particular characteristics for some applications (Beltran-P erez et al, 2015). The effectiveness of the Improved Fuller's earth method is probably due to the presence of pure nitrogen.…”

Section: Resultsmentioning

confidence: 99%

Pretreatment of Fuller's earth with nitrogen

N’cho

Fofana

Béroual

2020

Heliyon

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This paper summarizes experimental findings of the regenerative capability of nitrogen on Fuller's earth. Regenerating new oil from aged oil involves several cycles requiring a large volume of Fuller's earth. The use of large amounts of Fuller's earth is not economically profitable for companies that carry out regenerative operations to service transformer oils and can have environmental implications, since Fuller's earth is usually used to reclaim transformer oil in a one-time batch basis then disposed of. To improve the situation, a new technique to reduce the number of regeneration cycles is proposed. It is shown that Fuller's earth can be improved by purging it with continuous flowing of a fluid, preferably dry nitrogen.

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Heterogeneous Fenton Oxidation with Natural Clay for Textile Levafix Dark Blue Dye Removal from Aqueous Effluent

2023

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The ever-increasing technological advancement and industrialization are leading to a massive discharge of hazardous waste into the aquatic environment, calling on scientists and researchers to introduce environmentally benign solutions. In this regard, the current work is based on introducing Fuller’s earth, which is regarded as an environmentally benign material, as an innovative Fenton oxidation technology to treat effluent loaded with Levafix Dark Blue dye. Initially, Fuller’s earth was chemically and thermally activated, then subjected to characterization using a field-emission scanning electron microscope (FE-SEM) augmented with an energy-dispersive X-ray analyzer (EDX) and Fourier transform infrared (FTIR). This detailed the morphologies of the samples and the functional groups on the catalyst leading to the reaction with the dye. Fuller’s earth, augmented with hydrogen peroxide, was then introduced as a photo-Fenton oxidation system under UV illumination for dye oxidation. Moreover, a response surface mythological analysis was applied to optimize the most effective operational parameters. The experimental data revealed that the optimal Fuller’s earth dose corresponded to 1.02 mg/L using the optimal H2O2 of 818 mg/L at pH 3.0, and the removal efficiency reached 99%. Moreover, the thermodynamic parameters were investigated, and the data revealed the positive ∆G′ and negative ∆S′ values that reflect the non-spontaneous nature of oxidation at high temperatures. Additionally, the negative ∆H′ values suggest the occurrence of the endothermic oxidation reaction. Furthermore, the reaction followed the second-order kinetic model. Finally, the catalyst stability was investigated, and reasonable removal efficiency was attained (73%) after the successive use of Fuller’s earth reached six cyclic uses.

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Structural modification of regenerated fuller earth and its application in the adsorption of anionic and cationic dyes

Cited by 3 publications

References 30 publications

The influence of three acid modifications on the physicochemical characteristics of tea-waste biochar pyrolyzed at different temperatures: a comparative study

The influence of three acid modifications on the physicochemical characteristics of tea-waste biochar pyrolyzed at different temperatures: a comparative study

Pretreatment of Fuller's earth with nitrogen

Heterogeneous Fenton Oxidation with Natural Clay for Textile Levafix Dark Blue Dye Removal from Aqueous Effluent

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