Kinetics, isotherm and thermodynamic studies of Reactive Black 5 removal by acid acrylic resins

Greluk, Magdalena; Hubicki, Zbigniew

doi:10.1016/j.cej.2010.06.043

Cited by 132 publications

(60 citation statements)

References 51 publications

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“…The ΔGº values are found to decrease as the temperature increases in both dye-anion exchanger systems, suggesting that higher temperatures make the adsorption easier. The negative value of ΔGº indicates the adsorption is favorable and spontaneous [55]. The negative values of ΔHº further confirm the exothermic nature of the adsorption process.…”

Section: Thermodynamic Studiesmentioning

confidence: 62%

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Experimental Study to Remediate Acid Fuchsin Dye Using Laccase-Modified Zeolite from Aqueous Solutions

Kalkan

Nadaroğlu

Çelebi

et al. 2015

Pol. J. Environ. Stud.

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Section: Thermodynamic Studiesmentioning

confidence: 62%

“…Hence, the adsorption of AFD on LMZ is chemical in nature. The positive values of ΔSº indicate good affinity of the anion exchangers for AFD molecules and show an increase in the degree of freedom for the adsorbed species [55,[56][57][58].…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Experimental Study to Remediate Acid Fuchsin Dye Using Laccase-Modified Zeolite from Aqueous Solutions

Kalkan

Nadaroğlu

Çelebi

et al. 2015

Pol. J. Environ. Stud.

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“…By plotting ln q e versus ln C e , the values of n and K F can be obtained from the slope and the intercept of the linear plot. The values of 1/n imply the type of isotherm and can be classified as irreversible (1/n = 0), favorable (0 < 1/n < 1) and unfavorable (1/n > 1) [28][29][30]. The obtained values of 1/n (0.1 < 1/n < 1) showed the favorable nature of both investigated dyes and the heterogeneity of the adsorbent sites at temperatures studied.…”

Section: Adsorption Isothermsmentioning

confidence: 93%

Anionic and Cationic Dyes Removal from Aqueous Solutions by Adsorption onto Synthetic Mg/Al Hydrotalcite-Like Compound

Heraldy¹,

Santosa²,

Triyono³

et al. 2015

Indones. J. Chem.

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“…the larger the intercept the greater is the boundary layer effect (mass resistance), and the greater is the contribution of the surface adsorption in the rate limiting step [25]. In conclusion the adsorption mechanism of dye uptake by LDH is quite a complex process and cannot be explained by a single kinetic model alone, but could have involved more than single type of kinetic mechanism, all of which may be operating simultaneously [26][27]. …”

Section: Kinetic Of Adsorptionmentioning

confidence: 99%

ADSORPTION OF ANIONIC DYES FROM AQUEOUS SOLUTIONS BY CALCINED AND UNCALCINED Mg/Al LAYERED DOUBLE HYDROXIDE

Sumari

Hamzah

Kantasamy

2016

MJAS

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The uptake of Acid Blue 29 (AB29), Reactive Orange 16 (RO16) and Reactive Red 120 (RR120) from aqueous solutions by calcined (CLDH) and uncalcined Mg/Al layered double hydroxide (LDH) has been investigated. The adsorption process was conducted in a batch mode at 25 °C. Anionic dye removal was more efficient using the CLDH rather than LDH. The adsorption process by CLDH involved reconstruction and hydration of the calcined LDH and intercalation of AB29, RO16 and RR120. Physical characterization using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) were used to ascertain the 'memory effect' phenomenon that is structural reconstruction to regain its original LDH after rehydration. To gain insight into the mechanism of adsorption by CLDH, the pseudo-first order (PFO) and pseudo-second order (PSO) and intraparticle diffusion (IPD) kinetic models were used to analyse experimental data. Based on the correlation coefficient (R 2 ), the PSO has better fitting (R 2 = 0.987 -1.00) compared to PFO (R 2 = 0.867 -0.990). Furthermore the values of maximum adsorption capacity, (q e ) calculated from PSO model are consistent with the experimental q e indicating that the experimental kinetic data for AB29, RO16 and RR120 adsorption by CLDH are suitable for this model. Recycling of the adsorbent, in cycles of calcination-reconstruction process promised a possibility of regeneration of CLDH.Keywords: calcined, adsorption capacity, reconstruction, memory effect, regeneration Abstrak Penyingkiran pewarna Acid Blue 29 (AB29), Reactive Orange 16 (RO16) dan Reactive Red 120 (RR120) daripada larutan akues menggunakan Mg/Al dwi-hidroksida berlapis berkalsin (CLDH) dan tanpa kalsin (LDH) telah dilakukan menggunakan kaedah berkelompok pada suhu 25 °C. Penjerapan bahan pewarna menggunakan CLDH didapati lebih berkesan berbanding LDH. Penjerapan bahan pewarna oleh CLDH berlaku melibatkan proses penghidratan dan penstrukturan semula CLDH dan juga apitan AB29, RO16 dan RR120. Pencirian fizikal pada bahan penjerap yang diperolehi dengan menggunakan kaedah Pembelauan Sinar-X (XRD), Mikroskopi Imbasan Elektron (SEM) dan Spektroskopi Inframerah Transformasi Fourier (FTIR) telah digunakan untuk mengenalpasti fenomena 'kesan memori', iaitu proses penstrukturan semula kepada LDH selepas berlaku penghidratan. Cerapan lebih lanjut mengenai mekanisme proses penjerapan ini, model-model kinetik pseudo tertib pertama (PFO), pseudo tertib kedua (PSO) dan resapan intrapartikel (IPD) telah digunakan untuk menganalisis data ujian. Berdasarkan nilai pekali korelasi (R 2 ), model PSO didapati lebih sesuai (R 2 = 0.99 -1.00) berbanding PFO (R 2 = 0.85 -0.99). Fakta ini diperkukuhkan lagi dengan nilai kapasiti penjerapan maksimum, (q e ) hasil pengiraan menggunakan PSO yang didapati konsisten dengan q e ujian (q e, expt .) untuk AB29, RO16 dan RR120. Kitaran semula bahan penjerap melalui beberapa siri kitaran pengkalsinan-penstrukturan semula juga didapati dapat menjanjikan penjanaan semula CLDH.

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Kinetics, isotherm and thermodynamic studies of Reactive Black 5 removal by acid acrylic resins

Cited by 132 publications

References 51 publications

Experimental Study to Remediate Acid Fuchsin Dye Using Laccase-Modified Zeolite from Aqueous Solutions

Experimental Study to Remediate Acid Fuchsin Dye Using Laccase-Modified Zeolite from Aqueous Solutions

Anionic and Cationic Dyes Removal from Aqueous Solutions by Adsorption onto Synthetic Mg/Al Hydrotalcite-Like Compound

ADSORPTION OF ANIONIC DYES FROM AQUEOUS SOLUTIONS BY CALCINED AND UNCALCINED Mg/Al LAYERED DOUBLE HYDROXIDE

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