Synthesis and investigation of green hydrogels for simultaneous removal of mercuric cations and methylene blue from aqueous solutions

Keshawy, Mohamed; Kamal, Rasha S.; Abdel-Raouf, Manar El-Sayed

doi:10.21608/ejchem.2021.100722.4678

Cited by 10 publications

(9 citation statements)

References 43 publications

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“…Then, according to the height measurement, it can be expected that (Ch-Er) 3 would give maximum removal; the elimination experiments proved this prediction. These findings agree with our previous work (Keshawy et al 2022).…”

Section: Afm Study Of Chitosan-erythritol Hydrogelssupporting

confidence: 94%

Green synthesis of chitosan/erythritol/graphene oxide composites for simultaneous removal of some toxic species from simulated solution

Sayed

Mazrouaa

Mohamed

et al. 2022

Environ Sci Pollut Res

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In this study, chitosan (Ch) is adapted via green methodology including sonication induced crosslinking with different weight ratios of erythritol (Er) from (Ch-Er)1 to (Ch-Er)4. The products were casted in the form of thin films. The chemical modification was proved via FTIR spectroscopy. Then, the modified products were verified via an atomic force microscopy (AFM) investigation for their topography and surface properties. The data revealed that the optimized sample was (Ch-Er)3. This sample was further modified by different weight ratios of graphene oxide 0.1, 0.2, 0.4, and 0.8 wt./wt. (symbolized as (Ch-Er)3GO1, (Ch-Er)3GO2, (Ch-Er)3GO4, and (Ch-Er)3GO8 respectively). The prepared samples were investigated by different analytical tools. Then, the adjusted sample (Ch-Er)3GO2 was irradiated by electron beam (e-beam) at 10 and 20 kGy of irradiation doses to give samples (Ch-Er)3GO2R10 and (Ch-Er)3GO2R20, respectively. The AFM data of the irradiated samples showed that the pore size decreases, and surface roughness increases at higher energy e-beam due to the formation of more crosslinking points. The optimum samples of the prepared formulations were tested as sorbent materials for simultaneous elimination of methylene blue (MB) dye and mercury cation (Hg2+) from simulated solutions. The maximum removal of both MB dye and Hg2+ cation was achieved by (Ch-Er)3GO2R10 (186.23 mg g−1 and 205 mg g−1) respectively. Graphical abstract

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Section: Afm Study Of Chitosan-erythritol Hydrogelssupporting

confidence: 94%

Green synthesis of chitosan/erythritol/graphene oxide composites for simultaneous removal of some toxic species from simulated solution

Sayed

Mazrouaa

Mohamed

et al. 2022

Environ Sci Pollut Res

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“…The intensity of this layer increased with increasing removal capacity. In our previous works, 34,35 we could apply the AFM for confirming the adsorption process by comparing the AFM outcomes before and after metal uptake. We found that the adsorbed species appear as a bright layer covering the surface causing the increase in the height measurement and the change in roughness values.…”

Section: Adsorption Kinetics 381 Adsorption Kinetics Of the Chitosan-...mentioning

confidence: 99%

Chitosan-Based Architectures as an Effective Approach for the Removal of Some Toxic Species from Aqueous Media

Abdel-Raouf

Farag

et al. 2023

ACS Omega

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Modified uncrosslinked and crosslinked chitosan derivatives were investigated as green sorbents for the removal of copper (Cu 2+ ) and lead (Pb 2+ ) cations from simulated solutions. In this regard, N, O carboxymethyl chitosan (N, O CMC), chitosan beads (Cs-g-GA), chitosan crosslinked with glutaraldehyde/methylene bisacrylamide (Cs/GA/MBA), and chitosan crosslinked with GA/epichlorohydrin (Cs/GA/ECH) were prepared and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy analyses. Atomic force microscopy investigation was carried out to compare the surface topography of the prepared samples before and after the metal uptake. The kinetics of the removal process were investigated by pseudo-first-order and -second-order models. Moreover, the adsorption isotherms were carefully studied by applying Langmuir and Freundlich models. The data reveal that upon adsorption of copper(II) metal ions, all chitosan-modified products followed the Langmuir isotherm except for Cs/GA/ECH which followed the Freundlich isotherms, and the highest adsorption capacity ( q e ) was obtained for Cs/GA/MBA due to the formation of stable chelate structures between the metal cation and the functional groups present on the modified chitosan product. The order of metal uptake at the optimum pH value is as follows: Cs/GA/MBA (Cu: 95.7 mg/g, Pb: 99.15 mg/g), Cs/GA/ECH (Cu: 80.4 mg/g, Pb: 93.14 mg/g), Cs-g-GA (Cu: 77 mg/g, Pb: 88.4 mg/g), and N, O CMCh (Cu: 30.2 mg/g, Pb: 44.8 mg/g). The AFM data confirmed the metal uptake process by comparing the roughness and height measurements of the free sorbents and the metal-loaded sorbents.

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“…AFM is a modest tool for topography charcaterization of different material. It is used in describing the surface of hydrogels in previous works [10,32]. In this work, the AFM is used to study the surface topography, the porous structure, and the height of GG-PC/PAAm/ZnO 0 , GG-PC/PAAm/ ZnO 3 , and GG-PC/PAAm/ZnO 7 (Fig.…”

Section: Atomic Force Microscopy (Afm)mentioning

confidence: 99%

Radiation Synthesis of Green Nanoarchitectonics of Guar Gum-Pectin/Polyacrylamide/Zinc Oxide Superabsorbent Hydrogel for Sustainable Agriculture

Sayed

Mohamed

Abdel-Raouf

et al. 2022

J Inorg Organomet Polym

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In the current study, the performance of superabsorbent hydrogel composites comprised of Guar gum-Pectin/Polyacrylamide/ZnO crosslinked with gamma irradiation (10 kGy) has been investigated for sustainable agriculture. The claimed composites (GG/PC/PAAm/ZnOx) were characterized by FTIR, TGA, and AFM. The swelling capacity data reveal that the equilibrium water swelling (EW) of the composites was increased by increasing the ZnO content from 600 to 1050 g/g for zero to the highest concentration of ZnO, respectively. Furthermore, the physical properties of the soil mixed with the hydrogels were improved; water holding capacity (WHC) increased to 66% and water retention (WR) kept at 15% after 20 days. The composites showed a good degradability in the biodegradation test. They also portrayed super-absorption capacity at three swelling/deswelling cycles. This advancement is important for reducing water consumption through the irrigation of arid lands. The prepared composites were proved as excellent candidates in sustainable agriculture applications.

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Synthesis and investigation of green hydrogels for simultaneous removal of mercuric cations and methylene blue from aqueous solutions

Cited by 10 publications

References 43 publications

Green synthesis of chitosan/erythritol/graphene oxide composites for simultaneous removal of some toxic species from simulated solution

Green synthesis of chitosan/erythritol/graphene oxide composites for simultaneous removal of some toxic species from simulated solution

Chitosan-Based Architectures as an Effective Approach for the Removal of Some Toxic Species from Aqueous Media

Radiation Synthesis of Green Nanoarchitectonics of Guar Gum-Pectin/Polyacrylamide/Zinc Oxide Superabsorbent Hydrogel for Sustainable Agriculture

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