Influence of GO reinforcement on keratin based smart hydrogel and its application for emerging pollutants removal

Ramos, María Luz Peralta; Galaburri, Gonzalo; González, Joaquín; Pérez, Claudio Javier; Villanueva, María Emilia; Copello, Guillermo Javier

doi:10.1016/j.jece.2018.11.011

Cited by 18 publications

(7 citation statements)

References 31 publications

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“…Further insight into the effect of the H 2 O 2 concentration and temperature was acquired through studying the hydrated materials by 1 H HRMAS NMR, as it is presented in Figure 6 and SD 11. In agreement with the solid-state 13 C CP-MAS NMR, at the swelled state there were no clear changes from the appearance or disappearance of peaks after the oxidation. The most significant variations appeared at 8.3 ppm and 1.9 ppm peaks where it could be seen the increase of the relative intensity of these signals together with the increase of H 2 O 2 concentration and the increase in the incubation temperature.…”

Section: H Hrmas Nmr Of Swelled Hydrogelssupporting

confidence: 84%

“…The analysis by solid state 13 C CP-MAS NMR (Figure 1b) of the dry Ker and Kox, confirmed that the main carbon structure of keratin was maintained after the oxidation treatment. shows the carbonyl resonance signal of the peptide bonds at 180-170 ppm well as some carbons associated with Tyr and Phe residues at 158 and 130 ppm, respectively.…”

Section: Infrared Raman Solid State Nmr and Xps Spectroscopic Charamentioning

confidence: 63%

“…Moreover, there are some other changes present in the swelled state corresponding to amide and or aromatic protons at a 1 H chemical shift around 7.25-7.75 ppm in Kox 10% (Figure 6) and also in Kox 20% at 45ºC (Figure SD 11). In this sense, the 1 H HRMAS spectra revealed more detailed information at the atomic scale in the swelled state than the information obtained from the 13 C CP-MAS spectra (Figure 2b). In the 13…”

Section: H Hrmas Nmr Of Swelled Hydrogelsmentioning

confidence: 80%

“…The solid-state Nuclear Magnetic Resonance (ss-NMR) experiments were acquired using a Bruker Avance-III HD spectrometer, equipped with a 14.1 T narrow-bore magnet operating at Larmor frequencies of 600.09 MHz for 1 H and 150.91 MHz for 13 C. Powdered samples were packed into 3.2-mm ZrO 2 rotors and rotated at magic angle spinning (MAS) at room temperature. Glycine was used as an external reference for the 13 C spectra and to set the Hartmann−Hahn matching condition in the cross-polarization and magic angle spinning (CP-MAS) experiments in 13 C spectra at a MAS rate of 15 kHz. The contact time during CP was 2000 µs.…”

Section: Spectroscopic Characterizationmentioning

confidence: 99%

“…From a different approach, without the use of chemical modifications or grafting polymers, the Peralta Ramos partial hydrolysis method lead to a smart keratin hydrogel that can be obtained by using environmentally friendly reagents [12]. The smart hydrogels developed by this method have demonstrated interesting potentialities in the field of water treatment and infection prevention [13,14]. Despite the broad scope of approaches used to obtain Keratose from Keratin, the stimuli-response behaviour of this bio-polymer still remains to be fully understood and needs further study.…”

Section: Introductionmentioning

confidence: 99%

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pH and ion-selective swelling behaviour of keratin and keratose 3D hydrogels

Galaburri

Ramos

Lázaro-Martínez

et al. 2019

European Polymer Journal

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The oxidation of keratin hydrogels was optimized aiming to obtain keratose hydrogels while maintaining the original 3D structure and pH-responsive behaviour. In addition, we present a comparative study of their dual-stimuli responsive behaviour regarding the pHresponsiveness and their previously non-described ion selective responsiveness. Keratose and keratin hydrogels showed similar swellings when contracted at low pH, and the former showed steeper expansion and higher swelling than the latter at high pH. In addition, both hydrogels showed selective responsiveness toward Ca 2+ ions when expanded, and toward Cu 2+ ions when contracted. IR, Raman, ss-NMR, HRMAS NMR, SAXS, and thermal characterization demonstrated that oxidation does not interfere with the stimuli-responsive mechanisms related to protein conformation. The higher swelling of keratose hydrogels would be originated in the increase of the mobility of the chains after oxidation coupled to the hydration of sulfonic acid groups.

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Section: H Hrmas Nmr Of Swelled Hydrogelssupporting

confidence: 84%

Section: Infrared Raman Solid State Nmr and Xps Spectroscopic Charamentioning

confidence: 63%

Section: H Hrmas Nmr Of Swelled Hydrogelsmentioning

confidence: 80%

Section: Spectroscopic Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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pH and ion-selective swelling behaviour of keratin and keratose 3D hydrogels

Galaburri

Ramos

Lázaro-Martínez

et al. 2019

European Polymer Journal

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Preparation of Pd/PANI/ITO composite electrode and its degradation of tetracycline wastewater

Zhang

Jiang

Wang

et al. 2021

J of Applied Polymer Sci

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In order to treat antibiotics organic pollutants in the water environment, the Pd/PANI/ITO composite electrode was prepared by the galvanostatic electrodeposition method in this paper. The surface morphology and electrocatalytic activity of the electrode were analyzed and tested. Using the degradation rate of electrocatalytic tetracycline wastewater as an indicator, the optimal parameter conditions for preparing the composite electrode were screened out: the optimal deposition current of PANI was 2 mA, and the deposition time was 10 min. The optimal deposition current for Pd is 2 mA, and the deposition time is 10 min. The optimal current for the degradation of tetracycline wastewater is 10 mA, and the relationship between the degradation current and the degradation time conforms to the pseudo-first-order reaction kinetics. The existence of ÁOH in the degradation process of tetracycline was verified by the coumarin fluorescence detection technology. Finally, the degradation process of tetracycline wastewater is analyzed. The results show that the intermediate products produced during the degradation of tetracycline are gradually cleavage of tetracycline molecules, and they are eventually converted into CO 2 and H 2 O.

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