Effect of surfactants on swelling capacity and kinetics of alginate-chitosan/CNTs hydrogel

Bibi, Azeem; Rehman, Sadiq-ur; Faiz, Rashida; Nawaz, Mohsan; Bibi, Saira

doi:10.1088/2053-1591/ab0697

Cited by 12 publications

(6 citation statements)

References 28 publications

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“…This trend is observed for all the composite films. Notably, the non-crosslinked chitosan film M5 has a higher swelling rate of 375% compared to that of crosslinked film, which is in accordance with literature reporting that the introduction of the crosslinking agent into the hydrogel matrix leads to a decrease in its swelling capacity [28].…”

Section: Swelling Behavior Of Alg/cs Biofilmssupporting

confidence: 89%

Sodium Alginate-Based Composite Films for Effective Removal of Congo Red and Coralene Dark Red 2B Dyes: Kinetic, Isotherm and Thermodynamic Analysis

Mokeddem

Benykhlef

Bendaoudi

et al. 2023

Water

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The present study aimed to investigate the adsorption capacity of two anionic dyes, namely, Congored (CR) and Coralene Dark Red2B (DR), onto prepared alginate (Alg) and chitosan(Cs) biopolymer films. The two biopolymers were combined at different mass ratios using a “solvent-cast” process to incorporate their unique properties and evaluate their effectiveness in removing the dyes. All samples were characterized by means of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and determination of point of zero charge (pHpzc). The swelling ratios were determined by gravimetric measurements. The effects of pH, adsorption time, thickness, temperature and initial concentration of CR and DR dyes on the adsorption results were studied systematically. The dye adsorption kinetics showed that the Alg/Cs films at % proportions of 75/25, 50/50, 25/75 and 0/100 reached equilibrium from 30 min to 180 min with high removal efficiencies that varied between 222.30 mg/g and 842.36 mg/g. The adsorption mechanism of CR and DR onto the synthesized biofilms was confirmed through Langmuir isotherm and the kinetics fitted well by the pseudo-second-order model, suggesting a monolayer and chemisorption process. The thermodynamic results demonstrated the spontaneity and the feasibility of the process as well as the exothermic nature. Hence, the findings revealed that the Alg/Cs biofilms could be employed as potential natural adsorbents for the removal of anionic dye pollutants from aqueous environments.

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Section: Swelling Behavior Of Alg/cs Biofilmssupporting

confidence: 89%

Sodium Alginate-Based Composite Films for Effective Removal of Congo Red and Coralene Dark Red 2B Dyes: Kinetic, Isotherm and Thermodynamic Analysis

Mokeddem

Benykhlef

Bendaoudi

et al. 2023

Water

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“…In particular, rhamnolipids are soluble in water (Abdel‐Mawgoud et al, 2009) and these molecules are substantially smaller than the agar gel pores. Therefore, they are expected to diffuse through the entire agar gel, a hydrogel, whose structure can be modified through swelling (Bibi et al, 2019; Li et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Long‐range alteration of the physical environment mediates cooperation between Pseudomonas aeruginosa swarming colonies

Deforet

2023

Environmental Microbiology

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Pseudomonas aeruginosa makes and secretes massive amounts of rhamnolipid surfactants that enable swarming motility over biogel surfaces. But how this rhamnolipids interact with biogels to assist swarming remains unclear. Here I use a combination of optical techniques across scales and genetically-engineered strains to demonstrate that rhamnolipids can induce agar gel swelling over distances >10,000x the body size of an individual cell. The swelling front is on the micrometric scale, and is easily visible using shadowgraphy. Rhamnolipid transport is not restricted to the surface of the gel, but occurs through the whole thickness of the plate and, consequently, the spreading dynamics depends on the local thickness. Surprisingly, rhamnolipids can cross the whole gel and induce swelling on the opposite side of a two-face Petri dish. The swelling front delimits an area where the mechanical properties of the surface properties are modified: water wets the surface more easily, which increases the motility of individual bacteria and enables collective motility. A genetically-engineered mutant unable to secrete rhamnolipids (rhlA -), and therefore unable to swarm, is rescued from afar with rhamnolipids produced by a remote colony.These results exemplify the remarkable capacity of bacteria to change the physical environment around them and its ecological consequences.

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“…This is due to its simplicity and stability, high efficiency, low treatment cost and recycling easiness of the adsorbents (Dutta et al, 2021). The use of natural polysaccharide biopolymers has raised significant interest due to their efficiency, abundance, biodegradability and specific biocompatibility (Bibi et al, 2019; Graham et al, 2019). In this context, polysaccharide-based hydrogels have been pointed out as an exceptional class of biomaterials which has attracted great interest in treating wastewater due to their eco-friendliness, low cost and efficient interactions with water contaminants (Mokeddem et al, 2023; Singh et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of double-cross-linked alginate-based hydrogel: Characterization and use in a context of circular economy for cationic dye removal

et al. 2023

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Hydrogels based on natural polysaccharides have received special attention in the last decade due to their interesting features, such as availability, biocompatibility, biodegradability and safety. Such characteristics may make them sustainable and eco-friendly materials for water and wastewater treatment, meeting the concept of circular economy. In this study, a novel double-cross-linked alginate-based hydrogel has been successfully synthesized using epichlorhydrin and sodium trimetaphosphate (STMP) as cross-linker agents and then used for the removal of methylene blue (MB) dye under different operating conditions. The obtained hydrogel was deeply characterized by using various analytical techniques, namely Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Experimental results showed that the synthesized double cross-linked hydrogel with relatively high STMP concentration (0.26 M) has promising structural and textural properties. This material exhibited excellent removal ability towards MB with a maximum adsorption capacity of about 992 mg/g for an initial pH of 10. The kinetic and isotherm modeling study revealed that the pseudo-second-order and Freundlich models fitted well the measured adsorption experimental data. The MB adsorption process onto the synthesized hydrogel is exothermic, feasible and spontaneous. It mainly includes electrostatic interaction and hydrogen bonds. These findings suggest that double-cross-linked alginate-based hydrogel can be considered as an attractive and potential adsorbent for an effective cationic dye removal from aqueous environments. The use of such a green adsorbent for the treatment of organic-pollutants-rich industrial wastewaters promotes sustainability and circular economy concepts.

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Effect of surfactants on swelling capacity and kinetics of alginate-chitosan/CNTs hydrogel

Cited by 12 publications

References 28 publications

Sodium Alginate-Based Composite Films for Effective Removal of Congo Red and Coralene Dark Red 2B Dyes: Kinetic, Isotherm and Thermodynamic Analysis

Sodium Alginate-Based Composite Films for Effective Removal of Congo Red and Coralene Dark Red 2B Dyes: Kinetic, Isotherm and Thermodynamic Analysis

Long‐range alteration of the physical environment mediates cooperation between Pseudomonas aeruginosa swarming colonies

Facile synthesis of double-cross-linked alginate-based hydrogel: Characterization and use in a context of circular economy for cationic dye removal

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