Incorporation of graphene oxide into a chitosan–poly(acrylic acid) porous polymer nanocomposite for enhanced lead adsorption

Medina, Ruji P.; Nadres, Enrico T.; Ballesteros, Florencio; Rodrigues, Débora F.

doi:10.1039/c6en00021e

Cited by 73 publications

(34 citation statements)

References 45 publications

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“…468 cm in both samples could be due to the Fe-O bonds of magnetite or maghemite [30]. The N-H bending and stretching bands of the terminal primary amine group of APTES cannot be seen as they overlapped with the 3443 cm −1 band; however, the grafting can be confirmed by the 2852 and 2932 cm −1 bands of the C-H bond stretching vibration that correspond to the propyl group [31].…”

Section: Characterizationmentioning

confidence: 87%

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Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Gallo-Córdova

Morales

Mazarío

2019

Water

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Solid phase extraction using magnetic nanoparticles has represented a leap forward in terms of the improvement of water quality, preventing the contamination of industrial effluents from discharge in a more efficient and affordable way. In the present work, superparamagnetic iron oxide nanoparticles (MNP) with different surface charges are tested as nanosorbents for the removal of chromium(VI) in aqueous solution. Uniform magnetic nanoparticles (~12 nm) were synthesized by a microwave polyol-mediated method, and tetraethyl orthosilicate (TEOS) and (3-aminopropyl) triethoxysilane (APTES) were grafted onto their surface, providing a variation in the surface charge. The adsorptive process of chromium was evaluated as a function of the pH, the initial concentration of chromium and contact time. Kinetic studies were best described by a pseudo-second order model in all cases. TEOS@MNP barely removed the chromium from the media, while non-grafted particles and APTES@TEOS@MNP followed the Langmuir model, with maximum adsorption capacities of 15 and 35 mgCr/g, respectively. The chromium adsorption capacities abruptly increased when the surface became positively charged as the species coexisting at the experimental pH are negatively charged. Furthermore, these particles have proven to be highly efficient in water remediation due their 100% reusability after more than six consecutive adsorption/desorption cycles.

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Section: Characterizationmentioning

confidence: 87%

“…Kinetic experimentation was performed at a pH of 2.5 and initial Cr(VI) concentration of 20 mg Cr /L by varying the adsorption time (5,15,30,45,60,90, 120 and 1440 min). After each adsorption experiment, the magnetic nanosorbent was separated by using a 60 × 30 mm magnet with a field at the surface of 320 kA/m.…”

Section: Kinetic Measurementsmentioning

confidence: 99%

Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Gallo-Córdova

Morales

Mazarío

2019

Water

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“…However, when the concentration of Pb 2+ exceeds 50 mM, the adsorption capacity of Alg-PAM remains stable and shows no further increase. Therefore, the maximum adsorption capacity of Alg-PAM for Pb 2+ is 252.2 mg/g, which is higher than that of most of the reported Pb 2+ sorbents (Table 2) [28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Adsorption Performance Of Alg-pam For Metal Ionsmentioning

confidence: 94%

Facile Fabrication of a Low-Cost Alginate-Polyacrylamide Composite Aerogel for the Highly Efficient Removal of Lead Ions

et al. 2019

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In this study, we demonstrate a one-step method for fabricating a novel sodium alginate-polyacrylamide (Alg–PAM) composite aerogel, which exhibits a very high affinity and selectivity towards Pb2+. The as-prepared Alg–PAM composite aerogel can uptake 99.2% of Pb2+ from Pb2+-containing aqueous solution (0.1 mM) and the maximum adsorption capacity for Pb2+ reaches 252.2 mg/g, which is higher than most of the reported Pb2+ adsorbents. Most importantly, the prepared Alg–PAM adsorbent can be regenerated through a simple acid-washing process with only a little loss of the adsorption performance after five adsorption–desorption cycles. In addition, the influence of the experimental conditions, such as the solution pH, contact time, and temperature, on the adsorption performance of the Alg–PAM adsorbent was studied. It is clear that the low-cost raw materials, simple synthesis, regeneration ability, and highly efficient removal performance mean that the designed Alg–PAM aerogel has broad application potential in treating Pb2+-containing wastewater.

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“…Due to the easy operation of this method, two kinds of polymers can also be dissolved into water followed by addition of GO dispersions. For example, Rodrigues and co‐workers fabricated PAA–CS–GO hydrogels by first dissolving PAA and CS solution and then mixing GO dispersions. Chen and co‐workers also fabricated PVA–CS–GO hydrogels by utilizing a similar method.…”

Section: The Preparation Of Polymer–graphene Hydrogelsmentioning

confidence: 99%

“…With the insertion of Au nanoparticles, PNIPAM/graphene/Au (PGA) hydrogel shows an improved catalytic behavior to MB under the exposure to NIR laser, which is owing to the dominant role of kinetically favorable temperature rise by the efficient photothermal energy conversion effect of graphene ( Figure ). In addition, many other polymer–graphene hydrogels have been reported on dye adsorption and water treatment …”

Section: Properties and Applications Of Polymer–graphene Hydrogelsmentioning

confidence: 99%

Recent Progress of Graphene‐Containing Polymer Hydrogels: Preparations, Properties, and Applications

Pan

Liu

Gai

2017

Macro Materials & Eng

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Polymer hydrogels have attracted much attention due to their mechanical, biological, and physicochemical properties. Incorporation of functional material enlarges their applications. Graphene, as a promising additive, has received great attention due to its large specific surface area, ultrahigh conductivity, strong antioxidant, thermal stability, high thermal conductivity, and good mechanical properties. In this brief review, graphene‐containing polymer hydrogels with special properties are summarized including their preparations, properties, and applications. In addition, future perspectives of polymer hydrogels containing graphene are briefly discussed.

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Incorporation of graphene oxide into a chitosan–poly(acrylic acid) porous polymer nanocomposite for enhanced lead adsorption

Abstract: This study describes the successful incorporation of graphene oxide into a chitosan–poly(acrylic acid) polymer blend to obtain porous hydrogel nanocomposite beads with higher lead removal and regeneration capability than any other chitosan hydrogel material or activated carbon.

Cited by 73 publications

References 45 publications

Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Effect of the Surface Charge on the Adsorption Capacity of Chromium(VI) of Iron Oxide Magnetic Nanoparticles Prepared by Microwave-Assisted Synthesis

Facile Fabrication of a Low-Cost Alginate-Polyacrylamide Composite Aerogel for the Highly Efficient Removal of Lead Ions

Recent Progress of Graphene‐Containing Polymer Hydrogels: Preparations, Properties, and Applications

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