Eco-friendly Enteromorpha polysaccharides-based hydrogels for heavy metal adsorption: From waste to efficient materials

Wen, Yutong; Xue, Chunlong; Ji, Deluo; Hou, Yale; Li, Kang; Liu, Ying

doi:10.1016/j.colsurfa.2022.130531

Cited by 24 publications

(2 citation statements)

References 51 publications

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“…In recent years, there have been considerable studies on hydrogels due to their adjustable chemical and physical properties [9][10][11]. Embedded nanomaterials into hydrogel networks to obtain nanocomposite hydrogels can overcome the limitations of insu cient strength and heat resistance of traditional hydrogels [12,13].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Laponite/poly(AA-AM) composite hydrogels for efficient removal of heavy metals

Huang,

Wan,

Chen

et al. 2024

Preprint

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Heavy metal wastewater contamination has become one of the greatest global environmental problems. In this study, magnetic Laponite/poly(AA-AM) composite hydrogels (mLap/(AA-AM)) with multi-level three-dimensional networks were for the first time synthesized by radical copolymerization based on poly(acrylamide-co-acrylic acid), Laponite and PEI-magnetic nanoparticles. mLap/(AA-AM) with porous and uneven structure has the target structure and composition confirmed by FTIR, FESEM, EDX and XRD results. FTIR and XRD results show that mLap/(AA-AM) has been successfully prepared without destroying high crystallinity of magnetic Fe3O4 and Laponite is dispersed in the polymer matrix with amorphous structure. mLap/(AA-AM) have high adsorption capacities of Cu(II) (238mg/g), Cd(II) (259mg/g) and Pb(II)(466mg/g). The endothermic, entropy increasing and spontaneous nature of heavy metal ion adsorption is revealed from thermodynamic study. Heavy metal ions adsorption isotherms and kinetics are in agreement with the Langmuir model and pseudo-second-order kinetic model, respectively. In addition, mLap/(AA-AM) has good magnetic response and magnetic solid-liquid separation property, high gel strength and reusability, which can solve the disadvantage of insufficient gel strength and complicated recovery process of conventional hydrogels and has thus huge potential in removing heavy metal ions from the contaminated wastewater.

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Section: Introductionmentioning

confidence: 99%

Magnetic Laponite/poly(AA-AM) composite hydrogels for efficient removal of heavy metals

Huang,

Wan,

Chen

et al. 2024

Preprint

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“…Furthermore, the Enteromorpha hydrolysate has been reported in several studies as a potential substrate for production of biofuels and bioactive compounds [42][43][44][45]. Some studies also suggested the potential application of Enteromorpha in bioremediation of heavy metals [46,47]. However, no effort has been made to ferment Enteromorpha hydrolysates to produce high-value fatty acids using thraustochytrids.…”

Section: Introductionmentioning

confidence: 99%

Saturated and Polyunsaturated Fatty Acids Production by Aurantiochytrium limacinum PKU#Mn4 on Enteromorpha Hydrolysate

Zhu

Ning

et al. 2023

Marine Drugs

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Thraustochytrids are unicellular marine heterotrophic protists, which have recently shown a promising ability to produce omega-3 fatty acids from lignocellulosic hydrolysates and wastewaters. Here we studied the biorefinery potential of the dilute acid-pretreated marine macroalgae (Enteromorpha) in comparison with glucose via fermentation using a previously isolated thraustochytrid strain (Aurantiochytrium limacinum PKU#Mn4). The total reducing sugars in the Enteromorpha hydrolysate accounted for 43.93% of the dry cell weight (DCW). The strain was capable of producing the highest DCW (4.32 ± 0.09 g/L) and total fatty acids (TFA) content (0.65 ± 0.03 g/L) in the medium containing 100 g/L of hydrolysate. The maximum TFA yields of 0.164 ± 0.160 g/g DCW and 0.196 ± 0.010 g/g DCW were achieved at 80 g/L of hydrolysate and 40 g/L of glucose in the fermentation medium, respectively. Compositional analysis of TFA revealed the production of equivalent fractions (% TFA) of saturated and polyunsaturated fatty acids in hydrolysate or glucose medium. Furthermore, the strain yielded a much higher fraction (2.61–3.22%) of eicosapentaenoic acid (C20:5n-3) in the hydrolysate medium than that (0.25–0.49%) in the glucose medium. Overall, our findings suggest that Enteromorpha hydrolysate can be a potential natural substrate in the fermentative production of high-value fatty acids by thraustochytrids.

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Research on Adsorption of Heavy Metal Ions by Polysaccharide Hydrogels

Liu,

Cai,

et al. 2024

ChemistrySelect

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In recent years, various industrial and agricultural problems have been highlighted, and the pollution of heavy metal ions to water bodies has become a considerable serious phenomenon. Adsorption method is an efficient, low‐cost, and easy to implement method for removing heavy metal ions, which does not produce secondary pollution, and has been widely used in water treatment. Polysaccharides are natural polymers, and their hydroxyl, carboxyl, and amine groups provide feasibility for the synthesis of hydrogels with various structures. The synthesized polysaccharide hydrogel has the characteristics of high adsorption capacity, specific adsorption, nontoxic, and so on. In this review, the kinds of polysaccharide hydrogels and different synthesis methods were discussed first. Then, the adsorption mechanism and different adsorption modes of polysaccharide hydrogels were reviewed. Finally, the effects of different environmental factors on the adsorption capacity of polysaccharide hydrogel were studied. The future research on the adsorption of heavy metal ions by polysaccharide hydrogels was proposed.

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Eco-friendly Enteromorpha polysaccharides-based hydrogels for heavy metal adsorption: From waste to efficient materials

Cited by 24 publications

References 51 publications

Magnetic Laponite/poly(AA-AM) composite hydrogels for efficient removal of heavy metals

Magnetic Laponite/poly(AA-AM) composite hydrogels for efficient removal of heavy metals

Saturated and Polyunsaturated Fatty Acids Production by Aurantiochytrium limacinum PKU#Mn4 on Enteromorpha Hydrolysate

Research on Adsorption of Heavy Metal Ions by Polysaccharide Hydrogels

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