Restricting layer collapse enhances the adsorption capacity of reduced-charge organoclays

Zhao, Jun; Ge, Fei; Zhu, Lusheng; Qi, Tao; He, Hongping

doi:10.1016/j.clay.2013.12.019

Cited by 18 publications

(2 citation statements)

References 32 publications

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“…[26][27][28] The effect is more significant in organobentonite modified with long carbon chain surfactants. 29,30 Microwave-assisted heating technique was used for the fabrication of the new adsorbent. 31 Compared with the traditional preparation method, the modifier molecules of polarity would be distributed by electromagnetic field under the microwave field, improving their orderliness, reaction activation energy, thermal efficiency, preparation time, and energy consumption.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Zhang

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: The adsorption removal of phenol onto bentonite that was prepared by the traditional hydrothermal method has been widely studied; especially, surfactant-modified bentonite has achieved an exclusive position on effective removal to phenol. However, the adsorption performance of the bentonite functionalized by double-carbon chain surfactants in a microwave field for phenol is relatively low. The study on the fabrication of organobentonite by microwave-assistance to remove organic pollutants still needs to be investigated. RESULTS:The adsorption performance of bentonite was enhanced after functionalizing with Dihexadecyldimethylammonium Bromide (D1621). FTIR and XRD patterns revealed that D1621 was successfully intercalated into bentonite, and the interval space was increased by 1.54 to 1.84 nm. The optimized preparation condition was obtained at a molar ratio (D1621: Bentonite) of 0.36, solid-liquid ratio (D1621 + Bent: water) of 0.12, microwave mode of Med, and thermal radiation for 6 min based on the indicator of phenol adsorption uptake. An excellent removal rate for phenol was observed at pH 2 to 7 and room temperature in adsorption tests. The adsorption process was spontaneous at room temperature according to thermodynamic parameters, and it agrees with Freundlich (R 2 = 0.9781) and pseudo-second-order (R 2 = 0.9999) models, validating a chemisorption process.CONCLUSION: The D1621-Bent perpetrated by using the microwave-assisted heating method was proven to be a reliable adsorbent for phenol in water. The adsorption performance of bentonite on phenol was remarkably enhanced after the introduction of organic modifiers.

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Section: Introductionmentioning

confidence: 99%

“…The distribution effect of the adsorption process was considered the major factor for the improvement of organic pollutant removal 26‐28 . The effect is more significant in organobentonite modified with long carbon chain surfactants 29,30 …”

Section: Introductionmentioning

confidence: 99%

Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Zhang

et al. 2022

J of Chemical Tech & Biotech

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Surface Chemistry of Mineral Adsorbents

Song

Peng

2020

Engineering Materials

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Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol

Ozola

Krauklis

Burlakovs

et al. 2019

Clays and clay miner.

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Organic pollutants are widespread and a known problem for the environment. p-nitrophenol (PNP) is one such pollutant found in effluents from various industries involved with pesticides, pharmaceuticals, petrochemicals, plastic, paper, and other materials. The objective of this research was to prepare and test organically modified clays using four different surfactants and to evaluate the removal efficiency of PNP from aqueous solutions. Organically modified clays have attracted great interest due to their wide applications in industry and environmental protection as sorbents for organic pollutants. Two natural smectite-dominated clay types from outcrops in Latvia and Lithuania as well as industrially manufactured montmorillonite (Mt) clay were modified using different nonionic (4-methylmorpholine N-oxide (NMO) and dimethyldodecylamine N-oxide (DDAO)) and cationic (benzyltrimethyl ammonium chloride (BTMAC) and dodecyltrimethyl ammonium chloride (DTAC)) surfactants. Modified clay materials were characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and the Brunauer-Emmett-Teller method (BET) for surface area analysis. Sorption of PNP was investigated under various conditions, e.g. surfactant loading, initial PNP concentration, contact time, and pH. The novelty of the present study was to prepare innovative organo-sorbents based on manufactured as well as natural clay samples using cationic surfactants and nonconventional nonionic surfactants as modifiers. The sorption data combined with FTIR and XRD supplementary results suggests that nonionic organo-clay (Mt-DDAO_2) is the most effective sorbent and may serve as a low-toxicity immobilizer of pollutants such as phenols.

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Restricting layer collapse enhances the adsorption capacity of reduced-charge organoclays

Cited by 18 publications

References 32 publications

Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Fabrication of organobentonite by microwave‐assisted heating and its adsorption property for phenol

Surface Chemistry of Mineral Adsorbents

Surfactant-Modified Clay Sorbents for the Removal of p-nitrophenol

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