Recent advances on composite hydrogels designed for the remediation of dye-contaminated water and wastewater: A review

Pereira, Antonio G.B.; Rodrigues, Francisco H. A.; Paulino, Alexandre Tadeu; Martins, Alessandro F.; Fajardo, André R.

doi:10.1016/j.jclepro.2020.124703

Cited by 171 publications

(78 citation statements)

References 241 publications

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“…Synthetic and natural hydrogels Heavy metal Selectivity, efficiency, and reusability [57] Synthetic and natural hydrogels Heavy metal Factors of adsorption and detection of metal [58] Synthetic and natural hydrogels Aqueous pollutants including dye, heavy metals, and anions Adsorption kinetics, regeneration, and reusability [49] Synthetic and natural hydrogels Dye, heavy metal, radioactive materials, pesticides Adoption properties, kinetics, isotherm, mechanism, factors, recycling, and recovery [59] Synthetic and natural hydrogels Dye and metal Synthesis, mechanism, modification of adsorbents, and kinetics [60] Acrylic-based hydrogels Dye and heavy metals Preparation and adsorption properties of different acrylic-based HG [61] Hybrid hydrogels Metal, radionuclides, anions, acid phenol ammonium Adsorption properties [62] Composite hydrogels Dye Adsorption properties of different types of composite hydrogels [63] Cellulose-based hydrogel Dye and metal Preparation, adsorption mechanisms, and factors affecting adsorption capacity This paper…”

Section: Types Of Hydrogel Types Of Pollutants Major Contentsmentioning

confidence: 99%

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Akter

Bhattacharjee

Dhar

et al. 2021

Gels

124

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Finding affordable and environment-friendly options to decontaminate wastewater generated with heavy metals and dyes to prevent the depletion of accessible freshwater resources is one of the indispensable challenges of the 21st century. Adsorption is yet to be the most effective and low-cost wastewater treatment method used for the removal of pollutants from wastewater, while naturally derived adsorbent materials have garnered tremendous attention. One promising example of such adsorbents is hydrogels (HGs), which constitute a three-dimensional polymeric network of hydrophilic groups that is highly capable of adsorbing a large quantity of metal ions and dyes from wastewater. Although HGs can also be prepared from synthetic polymers, natural polymers have improved environmental benignity. Recently, cellulose-based hydrogels (CBHs) have been extensively studied owing to their high abundance, biodegradability, non-toxicity, and excellent adsorption capacity. This review emphasizes different CBH adsorbents in the context of dyes and heavy metals removal from wastewater following diverse synthesis techniques and adsorption mechanisms. This study also summarizes various process parameters necessary to optimize adsorption capacity followed by future research directions.

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Section: Types Of Hydrogel Types Of Pollutants Major Contentsmentioning

confidence: 99%

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Akter

Bhattacharjee

Dhar

et al. 2021

Gels

124

View full text Add to dashboard Cite

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“…Moreover, the presence of H + ions in more acidic solutions favors the formation of hydrogen bonds between hydrogel and water, increasing the swelling capacity. Overall, the swelling mechanism of hydrophilic three-dimensional polymeric networks depends on the water diffusion process and macromolecular relaxation of polymer networks [34].…”

Section: Swelling Kineticsmentioning

confidence: 99%

Methylene Blue Release from Chitosan/Pectin and Chitosan/DNA Blend Hydrogels

2021

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Chitosan/DNA blend hydrogel (CDB) and chitosan/pectin blend hydrogel (CPB) were synthesized using an emulsion (oil-in-water) technique for the release of methylene blue (model molecule). Both hydrogels were characterized by swelling assays, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM), before and after the methylene blue (MB) loading. Higher swelling degrees were determined for both hydrogels in simulated gastric fluid. FT-IR spectra inferred absorption peak changes and shifts after MB loading. The TGA results confirmed changes in the polymer network degradation. The SEM images indicated low porosities on the hydrogel surfaces, with deformed structure of the CPB. Smoother and more uniform surfaces were noticed on the CDB chain after MB loading. Higher MB adsorption capacities were determined at lower initial hydrogel masses and higher initial dye concentrations. The MB adsorption mechanisms on the hydrogel networks were described by the monolayer and multilayer formation. The MB release from hydrogels was studied in simulated gastric and intestinal fluids, at 25 °C and 37 °C, with each process taking place at roughly 6 h. Higher release rates were determined in simulated gastric fluid at 25 °C. The release kinetics of MB in chitosan/DNA and chitosan/pectin matrices follows a pseudo-second-order kinetic mechanism.

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“…The morphology of PAA-AM/St (Figure 7b) can be divided into three parts. The bright bulges are presumed to be the furrows in the composite, the gray area are probably the gullies between the furrows, and the dark regions are speculated to be cavities created during graft copolymerization [32]. Combining all these three parts, PAA-AM/St was composed of fine particles, possessing not only a uniform and stable structure but also very large surface area.…”

Section: Morphology Analysismentioning

confidence: 99%

“…during graft copolymerization [32]. Combining all these three parts, PAA-AM/St was composed of fine particles, possessing not only a uniform and stable structure but also very large surface area.…”

Section: Morphology Analysismentioning

confidence: 99%

Preparation of Poly(acrylic acid-acrylamide/starch) Composite and Its Adsorption Properties for Mercury (II)

et al. 2021

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The poly (acrylic acid-acrylamide/starch) composite was synthesized by solution polymerization, aiming to adsorb mercury (II) in water. The resulted copolymer was characterized by particle size exclusion chromatography (SEC), Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG), scanning electron microscopy (SEM) and dynamic light scattering particle size analyzer (DLS). It turned out that starch was successfully incorporated with the macromolecular polymer matrix and played a key role for improving the performance of the composites. These characterization results showed that the graft copolymer exhibited narrow molecular weight distribution, rough but uniform morphology, good thermal stability and narrow particle size distribution. The graft copolymer was used to remove Hg(II) ions from aqueous solution. The effects of contact time, pH value, initial mercury (II) concentration and temperature on the adsorption capacity of Hg(II) ions were researched. It was found that after 120 min of interaction, poly (acrylic acid-acrylamide/starch) composite achieved the maximum adsorption capacity of 19.23 mg·g−1 to Hg(II) ions with initial concentration of 15 mg·L−1, pH of 5.5 at 45 °C. Compared with other studies with the same purpose, the composites synthesized in this study present high adsorption properties for Hg(II) ion in dilute solution. The adsorption kinetics of Hg(II) on the poly (acrylic acid-acrylamide/starch) composite fits well with the pseudo second order model.

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Recent advances on composite hydrogels designed for the remediation of dye-contaminated water and wastewater: A review

Cited by 171 publications

References 241 publications

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Cellulose-Based Hydrogels for Wastewater Treatment: A Concise Review

Methylene Blue Release from Chitosan/Pectin and Chitosan/DNA Blend Hydrogels

Preparation of Poly(acrylic acid-acrylamide/starch) Composite and Its Adsorption Properties for Mercury (II)

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