Selective adsorption of gold and silver in bromine solutions by acetate cellulose composite membranes coated with polyaniline or polypyrrole

Rascón-Leon, Salvador; Castillo‐Ortega, M. M.; Santos‐Sauceda, Irela; Munive, Guillermo Tiburcio; Rodríguez-Félix, Dora Evelia; Castillo-Castro, T. del; Encinas, José Carmelo; Valenzuela-García, Jesús L.; Quiroz-Castillo, Jesus Manuel; García-Gaitán, B.; Herrera‐Franco, Pedro J.; Álvarez-Sánchez, Jesús; Ramírez, José Zeferino; Quiróz-Castillo, Luis S.

doi:10.1007/s00289-017-2206-9

Cited by 14 publications

(11 citation statements)

References 69 publications

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“…The band at 1042 and 907 cm À1 is due to in-plane deformation of C-H bond of pyrrole ring. 24 The characteristic peak of Fe 3 O 4 at 470 cm À1 is for the stretching vibration of Fe-O bond according to reports. 25 It can be seen from ATP spectra that the peaks at 1086 cm À1 , 791 cm À1 and 565 cm À1 are respectively attributed to Si-O-Si stretching vibration and bending vibration.…”

Section: Resultsmentioning

confidence: 98%

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Sun

Zhang

et al. 2020

RSC Adv.

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Section: Resultsmentioning

confidence: 98%

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Sun

Zhang

et al. 2020

RSC Adv.

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“…Although it is expected that as the interactions are weak superficially the desorption is faster, it was not entirely so. 22 Electrospun membranes with large roughness due to PPy coating do not retain the complexes. This is because they form interactions only on the surface of the membranes and are only adsorbed, which does not influence the desorption process.…”

Section: Resultsmentioning

confidence: 99%

“… 21 Finally, Rascón-Leon et al used PPy coated membranes manufactured by the inversion method of phases in the recovery of the gold–bromine complex; before 10 h, the recovery reached about 40%, and after 15 h recovery stabilized at 85%. 22 Composite materials in the fiber shape of electroconductive polymers have a highly porous structure with specific surface and electrochemical properties and ion exchange capacities. 23 Conductive CA/PPy composite fibers have been obtained with the great advantage of preserving the main properties of electrospun membranes (flexibility, porosity, and large surface area).…”

Section: Introductionmentioning

confidence: 99%

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Electrospun Cellulose Acetate Membranes Coated with Polypyrrole and Their Potential Application in the Recovery of Metals

et al. 2022

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The purpose of this paper is to study the effect of polypyrrole (PPy) on cellulose acetate (CA) membranes prepared by the electrospinning technique (controlled variables) in the recovery of gold complexes of aqueous solutions that are environmentally ecofriendly. CA-PPy membranes were characterized by SEM, EDS, FTIR spectroscopy, contact angle measurements, electrical conductivity, and mechanical tests. They were submerged in two aqueous solutions using two gold complexes, AuI 2 – and AuBr 4 – , at room temperature. The recovery percentage was evaluated for several hours using the atomic adsorption technique for both complexes. The main findings indicate that the percentage of recovery in the first hours of the test was very high (>80%). The adsorption efficiency maxima were similar for both complexes (91%). The Langmuir model suggests the formation of a monolayer on the surface. The electrical conductivity did not change over time, and the mechanical properties indicate reuse in several experiments. Furthermore, the theoretical analysis showed that the system is helpful at acidic pH, funding its minimum energy. It is shown in this study that the used CA-PPy membranes show adsorption, absorption, and reusable properties with the effective recovery of the complexes in the first hours. These membranes could substitute for materials that are not environmentally ecofriendly.

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“…Therefore, it is not easy to improve its adsorption efficiency. , To overcome this shortcoming, preventing agglomeration and increasing surface area of PPy are very important during synthesis and adsorption. The PPy-based composites are considered to be one of the most effective methods, which mainly include organic-PPy composites and inorganic-PPy composites. − In 2011, Chandra and co-workers reported a PPy-reduced graphene oxide composite for the highly selective adsorption of Hg 2+ . Moreover, Bhaumik et al prepared the PPy/polyaniline nanofibers for the removal of Congo red from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Removal of Cr(VI) from Aqueous Solutions by Polypyrrole/Monodisperse Latex Spheres

Gao

Meng

et al. 2020

ACS Omega

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Pyrrole (Py) is easily agglomerated during the polymerization process, affecting its performance. In this paper, polypyrrole/monodispersed latex sphere (PPy/MLS) composites were prepared using in-situ polymerization for the adsorption of hexavalent chromium (Cr(VI)). The specific surface area of PPy/MLS (39.30 m2/g) was increased relative to that of PPy (24.82 m2/g), thus providing more effective adsorption sites. In addition, the adsorption properties of Cr(VI) under different conditions, including Py content, pH of the aqueous solution, and PPy/MLS dosage, were investigated to reveal the adsorption mechanism. The results showed that PPy/MLS possessed high Cr(VI) adsorption capacities when the Py content was 50 wt %. The maximum adsorption capacity was 343.64 mg/g at pH 2.0 and 25 °C. Remarkably, the adsorbents exhibited an excellent removal rate of Cr(VI) after three cycles of adsorption–desorption (over 99%), suggesting that the adsorbents had exceptional recyclability. Furthermore, the adsorption process followed quasi-second-order kinetics and Langmuir isothermal adsorption model. The high adsorption performance, sustainability, and cost-efficiency make this adsorbent a promising candidate for large-scale Cr(VI) contaminant removal.

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Selective adsorption of gold and silver in bromine solutions by acetate cellulose composite membranes coated with polyaniline or polypyrrole

Cited by 14 publications

References 69 publications

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Insight into the synergistic effect on adsorption for Cr(vi) by a polypyrrole-based composite

Electrospun Cellulose Acetate Membranes Coated with Polypyrrole and Their Potential Application in the Recovery of Metals

Highly Efficient Removal of Cr(VI) from Aqueous Solutions by Polypyrrole/Monodisperse Latex Spheres

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