Cationic hemicellulose-based hydrogels for arsenic and chromium removal from aqueous solutions

Dax, Daniel; Chavez, M. S; Xu, Chunlin; Willför, Stefan; Mendonça, Regis Teixeira; Sánchez, Julio

doi:10.1016/j.carbpol.2014.05.045

Cited by 74 publications

(35 citation statements)

References 30 publications

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“…The synthesis of the AcGGM‐MA macrocrosslinker was performed with good yields (1.4 g, 70%), and the characterization is in agree with the results presented by Dax et al . 1 H NMR (400 MHz, D 2 O, ppm): δ 1.81–2.00 (s, 3H, CH 2 CCH 3 ), 2.04–2.22 (m, 3H, COCH 3 ), 3.09–5.56 (nonanomeric and anomeric protons of AcGGM), 5.70–5.87 (m, 1H, CCH 2 ), 6.09–6.33 (m, 1H, CCH 2 ); C NMR (100 MHz, D 2 O, ppm): 17.47 (CCH 2 ), 20.27 (COCH 3 ), 59.75–77.48 (nonanomeric AcGGM carbon signals), 98.41–103.3 (anomeric AcGGM carbon signals), 127.47 (CH 2 CCH 3 ).…”

Section: Resultssupporting

confidence: 86%

“…The AcGGM macrocrosslinking reagent was synthesized using a previously described method by Dax et al . The AcGGM (9 kDa) (2 g, 12 mmol of anhydrous sugar units) was dissolved in 20 mL of dry DMSO at 50 °C.…”

Section: Methodsmentioning

confidence: 99%

“…The chemical modification of hemicelluloses presents an alternative for preparing materials with unique properties that can increase the value and utility of these biopolymers . One area of application is superabsorbent hydrogels, which have attracted significant attention in the biomedical area and in wastewater treatment …”

Section: Introductionmentioning

confidence: 99%

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Functionalized galactoglucomannan‐based hydrogels for the removal of metal cations from aqueous solutions

Elgueta

Sánchez

Dax

et al. 2016

J of Applied Polymer Sci

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New types of hydrogels derived from O-acetyl galactoglucomannan (AcGGM) hemicellulose have been synthesized and characterized. The objective of this work was to analyze the sorption capacity (S) of three types of hydrogels containing AcGGM derivatives incorporated into the carboxylic groups of the polymer chain in the AA hydrogel, sulfonic groups in the APA hydrogel, and amide groups in the acrylamide (Aam) hydrogel. These hydrogels are capable of interacting and removing ions such as cadmium [Cd(II)], copper [Cu(II)], lead [Pb(II)], nickel [Ni(II)], and zinc [Zn(II)]. The results show that AA and Aam hydrogels had a lower sorption capacity of ions compared to the APA hydrogel, which had a high sorption capacity. The maximal sorption capacity was determined by the successive enrichment method, obtaining Pb(II) amount of 48.3 mg/g of AA hydrogel, 65.8 mg/g of APA hydrogel, and 40.8 mg/g of Aam hydrogel. Hence, Pb(II) ions are greatly retained by the three hydrogels. These results are promising for the development of new materials with potential applications in metal ion removal.

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Section: Resultssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

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Functionalized galactoglucomannan‐based hydrogels for the removal of metal cations from aqueous solutions

Elgueta

Sánchez

Dax

et al. 2016

J of Applied Polymer Sci

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“…Some hydrogels possessing ionic groups have been used for adsorbing ionic dyes in wastewater (Jing et al 2012;Guo et al 2015;Peng et al 2015). Recently, special attention was paid to hydrogels prepared from hemicellulose (Peng et al 2012;Dax et al 2014), a heterogeneous polysaccharide, accounting for 15% to 35% in lignocellulosic feedstock. Hemicellulose can be modified at its hydroxyl groups to obtain various hydrolyzed with 72% H2SO4 for 1 h at 30 °C and hydrolyzed with 3% H2SO4 for 2 h at 121°C.…”

Section: Introductionmentioning

confidence: 99%

A Lignin-containing Hemicellulose-based Hydrogel and its Adsorption Behavior

2016

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A lignin-containing hemicellulose-based hydrogel was prepared from acylated hemicellulose and acrylic acid by free radical polymerization reaction, initiated by ammonium persulfate and N,N,N',N'-tetramethylethane-1,2-diamine in the presence of sodium lignosulfonate. Sodium lignosulfonate present in the hydrogel, when grafted by poly(acrylic acid), was identified as an interpenetrating polymer network form, while that not grafted by poly(acrylic acid) was identified as a semi-interpenetrating polymer network form. Both the swelling ratio and the adsorption capacity were dependent on sodium lignosulfonate dosage. The adsorption behavior of the hydrogel was evaluated. The maximum adsorption capacity towards methylene blue, a model dye, was 2691 mg/g. The adsorption kinetics and isotherm were well fitted by pseudo-second-order kinetics and Langmuir isotherm model, respectively. The hydrogel reveals an approximately 80% adsorption efficiency after fourth recycle. This hydrogel is a promising material for dye wastewater treatment.

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“…Similarly, but to a lesser extent, a hydrogel prepared from arabinoxylan and acrylic acid adsorbed Cu 2+ and Ni 2+ . AcGGM functionalized and cross‐linked with glycidyl methacrylate and [2‐(methacryloyloxy)ethyl]trimethylammonium chloride was prepared for the adsorption of Cr 6+ and As 5+ …”

Section: Introductionmentioning

confidence: 99%

Design of renewable poly(amidoamine)/hemicellulose hydrogels for heavy metal adsorption

Ferrari

Ranucci

Edlund

et al. 2014

J of Applied Polymer Sci

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Renewable poly(amidoamine)/hemicellulose hydrogels were prepared from O-acetylated galactoglucomannan (AcGGM)rich biomass and shown to display a significantly high adsorption capacity for Cu 21 , Cd 21 , Pb 21, Zn 21 , Ni 21 , Co 21 , and CrO 2-4 . Two different acrylamido end-capped poly(amidoamine) oligomers (PAA) were prepared and covalently immobilized onto an in situ formed polysaccharide network via water-based free radical graft copolymerization and cross-linking. The synthetic approach was shown to be viable when using a highly purified AcGGM or a crude spruce hydrolysate, an AcGGM and lignin containing biomass fraction as a reactant. Homogeneous reaction mixtures were obtained in both cases with polysaccharide contents up to 20% by weight. Oscillatory shear measurements indicated a predominantly solid-like behavior of the hydrogels with an increase in shear storage modulus with increasing cross-link density. The mechanical integrity of the PAA/hemicellulose hydrogels showed higher water swelling capacity and less fragility than the parent PAA hydrogels and they retained the heavy metal ion absorption ability of the PAA component, even in the presence of the least purified hemicellulose fraction.

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Cationic hemicellulose-based hydrogels for arsenic and chromium removal from aqueous solutions

Cited by 74 publications

References 30 publications

Functionalized galactoglucomannan‐based hydrogels for the removal of metal cations from aqueous solutions

Functionalized galactoglucomannan‐based hydrogels for the removal of metal cations from aqueous solutions

A Lignin-containing Hemicellulose-based Hydrogel and its Adsorption Behavior

Design of renewable poly(amidoamine)/hemicellulose hydrogels for heavy metal adsorption

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