Removal of Congo red by thermally and chemically modified halloysite: equilibrium, FTIR spectroscopy, and mechanism studies

Bessaha, Fatiha; Mahrez, Nouria; Marouf-Khelifa, Kheira; Çoruh, Ali; Khelifa, Amine

doi:10.1007/s13762-018-2041-z

Cited by 25 publications

(6 citation statements)

References 30 publications

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“…The uptake capacity of the as-fabricated nZVI@nBent–CMC composite is compared with different adsorbents reported for the removal of CR and CV, as shown in Table . The results clarify that the nZVI@nBent–CMC composite exhibits a greater uptake capacity compared to the reported adsorbents for both dyes. − Based on these results, the fabricated nZVI@nBent–CMC composite is a good magnetically bio-based candidate for the removal of both anionic and cationic contaminants from water.…”

Section: Results and Discussionmentioning

confidence: 54%

Zero Valent Iron Nanoparticle-Loaded Nanobentonite Intercalated Carboxymethyl Chitosan for Efficient Removal of Both Anionic and Cationic Dyes

et al. 2021

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A zero valent iron-loaded nano-bentonite intercalated carboxymethyl chitosan (nZVI@nBent–CMC) composite was fabricated and characterized by FT-IR, TEM, TEM–EDX, XRD, BET surface area, and zeta potential measurements. The as-fabricated nZVI@nBent–CMC composite exhibited excellent removal efficiency for both anionic Congo red (CR) dye and cationic crystal violet (CV) dye. The maximum uptake capacities of CR and CV onto the nZVI@nBent–CMC composite were found to be 884.95 and 505.05 mg/g, respectively. The adsorption process of both dyes well fitted with the Langmuir isotherm model and pseudo-second order kinetic model. Thermodynamic data clarified that the adsorptions of both CR and CV onto the nZVI@nBent–CMC composite are spontaneous processes. Moreover, the adsorption of CR onto the nZVI@nBent–CMC composite was found to be an exothermic process while that of CV is an endothermic process. The nZVI@nBent–CMC composite also exhibited excellent reusability for both studied dyes without noticeable loss in the removal efficiency, suggesting its validity to remove both anionic and cationic dyes from wastewater.

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Section: Results and Discussionmentioning

confidence: 54%

Zero Valent Iron Nanoparticle-Loaded Nanobentonite Intercalated Carboxymethyl Chitosan for Efficient Removal of Both Anionic and Cationic Dyes

et al. 2021

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“…Also, the SO symmetric stretching vibration peak moved from 1060 to 1043 cm –1 , proving strong electrostatic and hydrogen bonding interactions between the −SO 3 – group and the membrane. In addition, the typical CR peaks of −NH 2 , NN groups at 3465 and 1585 cm –1 vanished after adsorption, which may also be caused by the hydrogen bonding between −OH, −NH–/–NH 2 groups of the adsorbent and −NH 2 , NN groups of CR.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic FT-IR bands of CR diminished after adsorption compared to those of pure CR, which proved the chemisorption occurred in the adsorption process. 54,55 The S�O symmetric stretching vibration (1060 cm −1 ) and asymmetric stretching vibration 56 (1172 cm −1 ) in the range of 1060 to 1226 cm −1 belonging to pure CR attenuated or even disappeared after adsorption. This change can be ascribed to the strong hydrogen bonding interactions between the −SO 3 − group and the hydroxyl and amine groups in the fibrous membrane.…”

Section: Recovery Of Cr(vi)mentioning

confidence: 99%

Electrospinning PVA/PEI/rGO Fibrous Membrane and Its Adsorption of Cr(VI) and Congo Red in Water

Wang,

Xiao

2023

Ind. Eng. Chem. Res.

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“…These peaks shifted to 2921, 1605, 1319, and 1026 cm -1 , respectively, after loading the VIFP biosorbent with CR dye. Also, the spectrum of acid-treated VIFP biosorbent after adsorption of CR dye exhibited new additional peaks at 1521, 1439, and 1168 cm -1 , indicating profound involvement of N=N stretching vibrations, C-N bending vibration, and –S=O stretching vibration of the SO 3 functional groups of the CR dye, respectively [53]. The observed changes in absorption bands and the emergence of new peaks affirm the adsorption of CR dye via electrostatic interactions of the functional groups in CR dye molecules with those of the VIFP biosorbent [54, 55].…”

Section: Resultsmentioning

confidence: 99%

Biosorption of Congo Red Dye from Aqueous Solution Using Adsorbent Prepared from Vangueria infausta Fruit Pericarp

Kitemangu,

Vegi,

Malima

2023

Adsorption Science & Technology

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The adsorption efficiency of acid-treated Vangueria infausta fruit pericarp (VIFP) biosorbent to uptake Congo red (CR) dye was investigated through batch experiments. Optimum conditions for the adsorption process were determined by varying the solution pH, biosorbent dosage, contact time, initial concentration of CR dye, and temperature. Results revealed that the data fits well with the Langmuir isotherm model, demonstrating the monolayer coverage of the CR dye molecule on the surface of the VIFP biosorbent. The higher value of correlation coefficient, R 2 for pseudo-second-order (0.9997) compared to R 2 of pseudo-first-order (0.9605) suggests that the pseudo-second-order kinetic model is an ideal fit in describing the kinetics of CR dye adsorption by VIFP biosorbent. The positive value of Δ H ° (41.42 kJ/mol) and Δ S ° (158.32 J/mol.K) depicts the endothermic nature and spontaneity of the biosorption of CR dye by VIFP. The values of Δ G ° obtained were negative, showing that the adsorption is thermodynamically favourable. Therefore, the acid-treated adsorbent from Vangueria infausta can efficiently be used in the removal of CR dye from aqueous solution.

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Removal of Congo red by thermally and chemically modified halloysite: equilibrium, FTIR spectroscopy, and mechanism studies

Cited by 25 publications

References 30 publications

Zero Valent Iron Nanoparticle-Loaded Nanobentonite Intercalated Carboxymethyl Chitosan for Efficient Removal of Both Anionic and Cationic Dyes

Zero Valent Iron Nanoparticle-Loaded Nanobentonite Intercalated Carboxymethyl Chitosan for Efficient Removal of Both Anionic and Cationic Dyes

Electrospinning PVA/PEI/rGO Fibrous Membrane and Its Adsorption of Cr(VI) and Congo Red in Water

Biosorption of Congo Red Dye from Aqueous Solution Using Adsorbent Prepared from Vangueria infausta Fruit Pericarp

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