pH-Responsive Eco-Friendly Chitosan–Chlorella Hydrogel Beads for Water Retention and Controlled Release of Humic Acid

Li, Hao; Wang, Jin; Luo, Yang; Bai, Bo; Cao, Fangli

doi:10.3390/w14081190

Cited by 24 publications

(8 citation statements)

References 47 publications

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“…During water absorption, humic acid molecules enter the interior of the hydrogel, binding to the hydrophilic groups. This interaction ultimately limits further water absorption and swelling of the hydrogel …”

Section: Resultsmentioning

confidence: 99%

“…This interaction ultimately limits further water absorption and swelling of the hydrogel. 24 Pollutant concentration minimally impacts the dewatering process, resulting in a slight decrease in dewatering ratios under higher concentrations (Figure 1b). At high concentrations, more organic molecules adsorb onto the hydrogel, reducing the availability of its functional groups.…”

Section: ■ Methods and Materialsmentioning

confidence: 99%

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Water Recovery from Wastewater by Hydrogels

Sun,

Fei,

Yan

et al. 2024

Environ. Sci. Technol. Lett.

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Hydrogels possess a strong water absorption capability and can release absorbed water in response to physical or chemical stimuli, making them promising materials for water recycling. To explore the concept of using hydrogels to recover water from wastewater, we synthesized and utilized poly(acrylic acid-co-acrylamide) (PAAM) hydrogels to extract water from solutions containing various organic pollutants and salt concentrations. The swelling ratio of PAAM hydrogels reached up to 510 g/g with a water recovery of around 44% and a water production rate of approximately 3200 L/kg/day. The removal rates of organic pollutants reached up to 89%, depending on the pollutant’s properties such as molecular weight, functional group, solubility, and charge. This confirms the potential of using hydrogels to recover water from various wastewaters, especially for those containing large molecular pollutants.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Methods and Materialsmentioning

confidence: 99%

Water Recovery from Wastewater by Hydrogels

Sun,

Fei,

Yan

et al. 2024

Environ. Sci. Technol. Lett.

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“…Depending on the hydrogel formulation and the type of salt, hydrogel samples showed different water adsorption behavior. When hydrogels are submerged into salt solutions, their swelling power is decreased due to the lower difference in the osmotic pressure between hydrogel and solution [47] . As seen in Figure 7, hydrogel samples were subjected to three different salt solutions.…”

Section: Resultsmentioning

confidence: 99%

“…When hydrogels are submerged into salt solutions, their swelling power is decreased due to the lower difference in the osmotic pressure between hydrogel and solution. [47] As seen in Figure 7, hydrogel samples were subjected to three different salt solutions. MNH-3 showed the highest swelling capacity at all studied salts compared to other samples.…”

Section: Salt-type Effect On the Swelling Capacity Of Mnhmentioning

confidence: 99%

Magnetic, Biocompatible and Biodegradable Carboxymethyl Cellulose‐Based Hydrogel for Cationic Dye Adsorption

Kurdtabar,

Akhlaghi,

Marandi

et al. 2024

ChemistrySelect

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Ensuring the availability of water resources that are both clean and safe is crucial for the preservation of environmental health and the well‐being of humans. Here, we fabricated carboxymethyl cellulose‐based hydrogel nanocomposite using acrylic acid (AA) and 2‐acrylamido‐2‐methylpropane sulfuric acid (AMPS) monomers and Fe3O4 nanoparticles through a free radical crosslinking process for adsorption of dyes from contaminated water. The synthesized nanocomposite hydrogel was characterized using various techniques, including TEM, XRD, FTIR, SEM‐EDS, TGA, and AFM analysis. The swelling capacity of samples in an aqueous medium at multiple pH levels and the presence of different salts were investigated. The adsorption efficiency of methylene blue (MB) and crystal violet (CV), emphasizing the effect of hydrogel concentration and the medium's pH, was studied. It was concluded that the hydrogel sample containing 17 % AMPS and 51 % AA had better swelling capacity and dye removal efficiency. The dye adsorption kinetics data were fitted to pseudo‐first and second‐order kinetic models and the Langmuir and Temkin isotherm models. The maximum adsorption capacity for MB and CV was 53.97 and 53.57 mg/g, respectively. It was revealed that the pseudo‐second‐order kinetic model could best describe adsorption (qe=79.2 mg/g for MB and qe=65.8 mg/g for CV). The intra‐particle diffusion model was found to be the rate‐limiting mechanism of dye adsorption. Thermodynamic studies proposed that the adsorption of MB and CV was spontaneous and endothermic. Additionally, magnetic nanocomposite hydrogel‘s reusability up to four successive cycles further determines its probability of adsorption of dyes from wastewater.

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“…Moreover, its water retention increased by 20.48 and 61.15% when compared to M0.50/P30-DPNR/CS and the control experiment at 45 °C. The increase in water retention capacity suggests that the presence of silica can improve mechanical stability to the composites because of the strong H-bonding interactions between the silica and polar groups of modified natural rubber [ 49 ]. However, the water retention of M0.50/P30-DPNR/Si30/CS was not much different from M0.50/P30-DPNR/Si20/CS.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

et al. 2023

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The crosslinked poly(acrylic acid-co-acrylamide)-grafted deproteinized natural rubber/silica ((PAA-co-PAM)-DPNR/silica) composites were prepared and applied as coating materials for fertilizer in this work. The crosslinked (PAA-co-PAM)-DPNR was prepared via emulsion graft copolymerization in the presence of MBA as a crosslinking agent. The modified DPNR was mixed with various contents of silica (10 to 30 phr) to form the composites. The existence of crosslinked (PAA-co-PAM) after modification provided a water adsorption ability to DPNR. The swelling degree values of composites were found in the range of 2217.3 ± 182.0 to 8132.3 ± 483.8%. The addition of silica in the composites resulted in an improvement in mechanical properties. The crosslinked (PAA-co-PAM)-DPNR with 20 phr of silica increased its compressive strength and compressive modulus by 1.61 and 1.55 times compared to the unloaded silica sample, respectively. There was no breakage of samples after 80% compression strain. Potassium nitrate, a model fertilizer, was loaded into chitosan beads with a loading percentage of 40.55 ± 1.03% and then coated with the modified natural rubber/silica composites. The crosslinked (PAA-co-PAM)-DPNR/silica composites as the outer layers had the ability of holding water in their structure and retarded the release of fertilizer. These composites could be promising materials for controlled release and water retention that would have potential for agricultural application.

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pH-Responsive Eco-Friendly Chitosan–Chlorella Hydrogel Beads for Water Retention and Controlled Release of Humic Acid

Cited by 24 publications

References 47 publications

Water Recovery from Wastewater by Hydrogels

Water Recovery from Wastewater by Hydrogels

Magnetic, Biocompatible and Biodegradable Carboxymethyl Cellulose‐Based Hydrogel for Cationic Dye Adsorption

Preparation of Crosslinked Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber/Silica Composites as Coating Materials for Controlled Release of Fertilizer

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