Synthesis of linear low-density polyethylene-g-poly (acrylic acid)-co-starch/organo-montmorillonite hydrogel composite as an adsorbent for removal of Pb(ΙΙ) from aqueous solutions

Irani, Maryam; Ismail, Hanafi; Ahmad, Zulkifli; Fan, Maohong

doi:10.1016/j.jes.2014.05.049

Cited by 81 publications

(23 citation statements)

References 39 publications

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Section: Environmental Applicationssupporting

confidence: 69%

“…The electrostatic attractions, ion exchange and chelation are possible explanation for the metal adsorption happened during the experiments. They reported that the equilibrium adsorption data of the hydrogel was consistent with Langmuir isotherm and the 430mg/g adsorption capacity was in line with other common adsorbents [69,70].Another feasible way to achieve an interesting water filtering is explained in a paper by . They claim a very promising hydrogel is chitosan thanks to a high presence of amino groups and hydrogen that can react with vinyl monomers.…”

supporting

confidence: 57%

“…This has been proven to improve selective adsorption of specific ions like Cu(II), Pu(II) and Mg(II) [70]. It is interesting properties that can be exploited in dye removal application and that has been demonstrate to be possible by magnetical doping of hydrogel microspheres with interpenetrated network (IPN) structures [71].…”

Section: Environmental Applicationsmentioning

confidence: 99%

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History and Applications of Hydrogels

Yahia¹

2015

J Biomed Sci

133

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Hydrogels have existed for more than half century, providing one of the earliest records of crosslinked hydroxyethyl methacrylate (HEMA) hydrogels. Today, hydrogels still fascinate material scientists and biomedical researchers and great strides have been made in terms of their formulations and applications. As a class of material, hydrogels are unique, they consist of a self-supporting, waterswollen three-dimensional (3D) viscoelastic network which permits the diffusion and attachment of molecules and cells. However, hydrogels have recently drawn great attention for use in a wide variety of biomedical applications such as cell therapeutics, wound healing, cartilage/bone regeneration and the sustained release of drugs. This is due to their biocompatibility and the similarity of their physical properties to natural tissue. This review aims to give an overview of the historic and the recent design concept of hydrogels and their several applications based on the old and the most recent publications in this field. Journal of Biomedical Sciences ISSN 2254-609XThis Article is Available in: www.jbiomeds.com 2 Hydrogels can be classified into two distinct categories, the natural and the synthetic hydrogels. Natural hydrogels include collagen, fibrin, hyaluronic acid, matrigel, and derivatives of natural materials such as chitosan, alginate and skill fibers. They remain the most physiological hydrogels as they are components of the extracellular matrix (ECM) in vivo. Two main drawbacks of natural hydrogels, however, make their final microstructures and properties difficult to control reproducibly between experiments. First, the fine details of their mechanical properties and their dependence on polymerization or gelation conditions are often poorly understood. Second, due to their natural origin (bovine fibrinogen, rat tail collagen… their composition may vary from one batch to another.In contrast, synthetic hydrogels such as poly (ethylene glycol) diacrylate, poly(acryl amide), poly(vinyl alcohol) are more reproducible, although their final structure can also depend on polymerization conditions in a subtle way, so that a rigorous control of the preparation protocol, including temperature and environment control, may be necessary. Generally speaking, synthetic hydrogels offer more flexibility for tuning chemical composition and mechanical properties; users can, for example vary the concentration or molecular weight of the precursor, or alter the percentage of crosslinkers. They can also be selected or tuned to be hydrolysable or biodegradable over variable periods of time.Hydrogels may be chemically stable or they may degrade and eventually disintegrate and dissolve. They are called «reversible» or «physical» gels when the networks are held together by molecular entanglements, and/or secondary forces including ionic, H-bonding or hydrophobic forces (Figure 2) [3]. Physical hydrogels are not homogeneous, since clusters of molecular entanglements, or hydrophobically-or ionically-associated domains, can create in h...

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Section: Environmental Applicationssupporting

confidence: 69%

supporting

confidence: 57%

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History and Applications of Hydrogels

Yahia¹

2015

J Biomed Sci

133

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“…The effect of C 0 on q e can be explaied that at lower initial heavy metal concentration, the active adsorption site is abundant, thus the q e increased as the increase of C 0 , while C 0 reached 400 mg/L for Pb 2+ and 300 mg/L for Cd 2+ , the active sites were nearly completely occupied by heavy metal ions due to the limited adsorption activity of hydrogel adsorbent. 36 The effect of C 0 on R (%) for Pb 2+ and Cd 2+ can be explained by the inonic strength effect and driving force, since the adsorption kinetic analysis has revealed that the adsorption rate is mainly contolled by external diffusion. Namely, at lower initial concentration of heavy metal ion solution, the driving force for adsorption caused by concentration difference between the exterior and interior of hydrogel was small and the active sites remained unsaturate, hence the R value was lower.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Fan

Shenzhen

et al. 2016

ACS Sustainable Chem. Eng.

139

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A serial of cross-linked sodium acrylate and acrylamide copolymer /graphene oxide (P(AANa-co-AM)/GO) hydrogels with different mass ratios of acrylic acid (AA) to acrylamide (AM) and different contents of N,N-methylenebisacrylamide (MBA) were prepared via dispersive polymerization.The prepared hydrogels were characterized by XRD, FT-IR, TGA, SEM, and BET in detail. The removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel have been improved significantly due to the addition of 1.0wt% of GO. The P(AANa-co-AM)/GO hydrogel with AA/AM=1 and 0.8 wt% of MBA has the highest removal efficiency for Pb 2+ and Cd 2+ and a suitable swelling ratio, which was selected as the adsorbent for systematic adsorption of Pb 2+ and Cd 2+ from aqueous solutions.The adsorption capacity and removal efficiency of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were dependent on pH, initial heavy metal ion concentration and adsorbent dosage. The presence of 0.01~0.05 M Mg 2+ or Ca 2+ has obvious effect on the adsorption of Cd 2+ . The adsorption kinetics and adsorption isotherms of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel followed pseudo-first order model and the Langmuir isotherm model, respectively. The maximum adsorption capacity of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel were calculated to be 452.3 and 196.4 mg/g at 298 K, respectively. The XPS analysis revealed that the adsorption mechanism of Pb 2+ and Cd 2+ on the P(AANa-co-AM)/GO hydrogel was ascribed to the chelation of -COOwith Pb 2+ and the ion-exchange of -COO -Na + with Cd 2+ , respectively. The P(AANa-co-AM)/GO hydrogel possesses good reusability and excellent fixed-bed column operation performance, which suggests that the P(AANa-co-AM)/GO hydrogel can be considered as a promising adsorbent for removing heavy metal ions from practical wastewater.wastewater. Exposure to Pb 2+ or Cd 2+ can lead to health hazards such as central nervous system damage, kidney and lung damage, anemia, bone lesions and infertility problems, and even cause cancer. 1-3 Removal of heavy metal ions from wastewater has been a hot issue. Various treatment technologies have been applied for removing heavy metal ions such as chemical precipitation, 3 ion-exchange, 4 adsorption, 5,6 flocculation, 7 electrolysis, 8 electrocoagulation 9 and membrane separation, 10-12 etc.Among them, adsorption is considered as a facile and effective technique, 13,14 some adsorbents such as biosorbents, 1 active carbon, 15 inorganic minerals, 16,17 and magnetic composites 5-6,18 have been investigated for removing heavy metal ions from aqueous solution. Generally, the adsorption efficiency depends mainly on the type of adsorbents. Recently, various studies have found that hydrogel adsorbents exhibited super adsorption capacity, wide pH independence, easy regeneration and good reusability for removal of toxic metal ions and dyes from wastewater. [13][14][19][20][21][22] As a novel adsorbent, hydrogels are polymers with three dimensional (3-D) networks which can be formed via physical or chemical...

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“…an important controlling parameter in the heavy metal ions adsorption process [19,20]. The cross-linked starch xanthate samples were put into the Pb 2+ and Cd 2+ solutions over a pH range of 2-9 at room temperature to investigate the influence of pH on Pb 2+ and Cd 2+ ions adsorption property.…”

Section: Effect Of Solution Ph the Ph Of Aqueous Solution Ismentioning

confidence: 99%

Absorbed Pb²⁺ and Cd²⁺ Ions in Water by Cross-Linked Starch Xanthate

Feng

Wen

2017

International Journal of Polymer Science

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A cross-linked starch xanthate was prepared by graft copolymerization of acrylamide and sodium acrylate onto starch xanthate using potassium persulfate and sodium hydrogen sulfite initiating system and N,N′-methylenebisacrylamide as a cross-linker. As this kind of cross-linked potato starch xanthate can effectively absorb heavy metal ions, it was dispersed in aqueous solutions of divalent heavy metal ions (Pb2+ and Cd2+) to investigate their absorbency by the polymer. Factors that can influence absorbency were investigated, such as the ratio of matrix to monomers, the amount of initiator and cross-linker, pH, and the concentration of metal ions. Results were reached and conclusion was drawn that the best synthetic conditions for the polymer adsorbing Pb2+ and Cd2+ were as follows: the quality ratio of matrix to monomers was 1 : 12 and 1 : 11, the amount of initiator was 2.4% and 3.2% of matrix, and the amount of cross-linker was 12 mg and 13 mg. When the initial concentration of ions was 10 mg/L, the highest quantities of adsorption of Pb2+ and Cd2+ were 47.11 mg/g and 36.55 mg/g. Adsorption mechanism was discussed by using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) test, and adsorption kinetic simulation.

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Synthesis of linear low-density polyethylene-g-poly (acrylic acid)-co-starch/organo-montmorillonite hydrogel composite as an adsorbent for removal of Pb(ΙΙ) from aqueous solutions

Cited by 81 publications

References 39 publications

History and Applications of Hydrogels

History and Applications of Hydrogels

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Absorbed Pb²⁺ and Cd²⁺ Ions in Water by Cross-Linked Starch Xanthate

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Synthesis of linear low-density polyethylene-g-poly (acrylic acid)-co-starch/organo-montmorillonite hydrogel composite as an adsorbent for removal of Pb(ΙΙ) from aqueous solutions

Cited by 81 publications

References 39 publications

History and Applications of Hydrogels

History and Applications of Hydrogels

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb2+ and Cd2+

Absorbed Pb2+ and Cd2+ Ions in Water by Cross-Linked Starch Xanthate

Contact Info

Product

Resources

About

Synthesis of Sodium Acrylate and Acrylamide Copolymer/GO Hydrogels and Their Effective Adsorption for Pb²⁺ and Cd²⁺

Absorbed Pb²⁺ and Cd²⁺ Ions in Water by Cross-Linked Starch Xanthate