Isotherm, kinetic, mechanism and thermodynamic studies of adsorption of a microbial lipase on a mesoporous and hydrophobic resin

Alves, Michelle D.; Aracri, Fernanda M.; Cren, Érika Cristina; Mendes, Adriano A.

doi:10.1016/j.cej.2016.11.069

Cited by 101 publications

(56 citation statements)

References 54 publications

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“…The results showed that the phosphate adsorption on ZFCL was a combination process between Langmuir and Freundlich models. At low sorbate concentration, it matched the Freundlich isotherm model and then was not against Henry's law . Besides, it displayed a monolayer sorption characteristic of Langmuir isotherm model at high adsorption concentration .…”

Section: Resultsmentioning

confidence: 99%

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Yang

Liu

Lǚ

et al. 2018

Surface & Interface Analysis

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Zn-Fe layered double hydroxide with chloride intercalation (ZFCL) was synthesized by a coprecipitation method at room temperature. ZFCL was characterized by N 2 adsorptiondesorption isotherms, X-ray diffraction, scanning electron microscope, Zeta-sizer analyzer, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The results showed that ZFCL had large surface area and layered structure. The maximum adsorption capacity of ZFCL was 150.6 mg/g at 25°C. That was higher than most other adsorbent which were reported. The kinetic data were described better by the pseudo-second-order adsorption kinetic rate model. The adsorption isotherm on the adsorbent was described by Langmuir, Freundlich, and Sips models at pH 6 and followed the fitting order: Sips >Freundlich>Langmuir. Thermodynamic analyses indicated that the phosphate adsorption on ZFCL was endothermic and spontaneous in nature. The sequence of coexisting cations and anions competing with phosphate was Ca 2+ > Mg 2+ > Na + and SO 4 2− > NO 3 − > Cl − . ZFCL can be regenerated by the sequential use of NaOH and ZnCl 2 . The adsorption capacity remained high as 108.6 mg/g after regeneration of 3 times. The results of zeta potential, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses indicated that the phosphate adsorption mechanisms involved ion exchange, Zn 3 (PO 4 ) 2 precipitation, and the formation of inner-sphere complex via replacement of surface hydroxyl groups by phosphate.

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Section: Resultsmentioning

confidence: 99%

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Yang

Liu

Lǚ

et al. 2018

Surface & Interface Analysis

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“…The first step implicates the enzymes being rapidly adsorbed to the external surface of the carrier or the adsorbate molecules diffusing to the boundary coating [29]. 5 and 6, the linear fitted curves failed to pass through the origin completely, with regard to the potential difference in the frequencies of mass transfer in the early and late phases of adsorption [27]. The following second step is attributed to the enzyme molecules diffusing from the solution to the internal carrier surface [43].…”

Section: Adsorption Mechanism Studiesmentioning

confidence: 99%

Adsorption Kinetics of Cellulase and Xylanase Immobilized on Magnetic Mesoporous Silica

et al. 2019

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The adsorption kinetics of cellulase and xylanase immobilized on magnetically separable, hierarchically ordered mesocellular mesoporous silica (M-HMMS) was investigated. The adsorption of cellulase on M-HMMS followed pseudo-secondorder kinetics while the xylanase adsorption followed the Avrami model. Intraparticle and film diffusion also affected this process. These results enable in-depth knowledge of the cellulase and xylanase adsorption mechanisms on M-HMMS for better future applications by improving the stability of the immobilization.

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“…Dentro deste contexto, o presente estudo teve como objetivo sintetizar o éster de laurato de isoamila a partir de óleo fúsel (matériaprima de baixo custo) utilizando como catalisador a lipase de Rhizopus oryzae imobilizada em uma matriz hidrofóbica (resina Diaion HP-20) em processo contínuo, utilizando reator de leito empacotado. A resina Diaion HP-20 é sintetizada a partir de copolímero de poliestireno/divinilbenzeno, com distribuição de tamanho de poro controlada e grande área de superfície que oferece uma excelente capacidade de adsorção de proteínas e é considerado um excelente suporte para imobilização de lipases (Alves et al, 2017).…”

Section: Introductionunclassified

ESTERIFICAÇÃO ENZIMÁTICA CONTÍNUA DO ÓLEO FÚSEL COM ÁCIDO LÁURICO EMPREGANDO LIPASE DE Rhizopus oryzae IMOBILIZADA EM SUPORTE POLIMÉRICO

Bôas¹,

Cerón²,

Biaggio³

et al. 2018

Blucher Chemical Engineering Proceedings

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RESUMO -O presente trabalho teve como objetivo estudar o aproveitamento do óleo fúsel na síntese de ésteres por esterificação enzimática com ácido láurico. A lipase deRhizopus oryzae imobilizada em suporte polimérico foi utilizada para mediar às reações em processo contínuo em reator de leito fixo a 45 °C alimentado com fluxo correspondente a um tempo espacial de 3,2 h. De acordo com os resultados, a esterificação enzimática do óleo fúsel e ácido láurico alcançou estado estacionário em 9 h, atingindo uma produtividade média de 794,43 ± 66,04 µmol/g.min com manutenção dessas condições por 144 h adicionais. Reações complementares foram realizadas em maior concentração de substrato para melhor compreender o papel da água no leito catalítico, sendo verificado comportamento similar ao encontrado anteriormente atingindo produtividade de 1598,68 ± 135,79 μmol/g.min e tempo de meia-vida do biocatalisador (t 1/2 ) em 248 h.

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Isotherm, kinetic, mechanism and thermodynamic studies of adsorption of a microbial lipase on a mesoporous and hydrophobic resin

Cited by 101 publications

References 54 publications

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Phosphate uptake behavior and mechanism analysis of facilely synthesized nanocrystalline Zn‐Fe layered double hydroxide with chloride intercalation

Adsorption Kinetics of Cellulase and Xylanase Immobilized on Magnetic Mesoporous Silica

ESTERIFICAÇÃO ENZIMÁTICA CONTÍNUA DO ÓLEO FÚSEL COM ÁCIDO LÁURICO EMPREGANDO LIPASE DE Rhizopus oryzae IMOBILIZADA EM SUPORTE POLIMÉRICO

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