Novel magnetic bio-sorbent hydrogel beads based on modified gum tragacanth/graphene oxide: Removal of heavy metals and dyes from water

Sahraei, Razieh; Pour, Zahra Sekhavat; Ghaemy, Mousa

doi:10.1016/j.jclepro.2016.10.170

Cited by 281 publications

(69 citation statements)

References 49 publications

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“…While on the TGA curve of TMGO, the most significant mass loss of GO occurred below 200 °C due to water produced by the decomposition of labile hydroxyl and carboxyl groups. 29 Finally, the total weight loss of TMGO reached 43.9% when the temperature reached 800 °C. It could be concluded that the modification of MN and the combination of GO and TMN was effective.…”

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confidence: 96%

Preparation of Tetraethylenepentamine Modified Magnetic Graphene Oxide for Adsorption of Dyes from Aqueous Solution

Tang¹,

Tang²,

Liu³

2017

J. Braz. Chem. Soc.

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In this study, tetraethylenepentamine modified magnetic graphene oxide nanomaterial (TMGO) was prepared and characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and vibration sample magnetometer (VSM). All the characterizations proved that the modification and preparation of TMGO were successful. The TMGO nanomaterial was used in the adsorption of Acid Red 18 (AR) in aqueous solution. The parameters like pH of solution, adsorption kinetics and isotherms were all investigated. The results indicated that the TMGO nanomaterial had satisfied adsorption ability and the maximum adsorption capacity was 524.2 mg g -1 at 45 °C and pH 6. The adsorption capacity remained at 91.8% of the initial value after five cycles. The adsorption process with AR was found through fitting the pseudo-second-order kinetics equations and the Freundlich adsorption model. The experimental results demonstrated that the TMGO nanomaterial could be rapidly extracted from the medium and had a good adsorption ability to remove dyes in wastewater.Keywords: adsorption, dye, graphene oxide, magnetic nanoparticles, tetraethylenepentamine IntroductionIncreasing interests were focused on the environmental health, especially the removal of toxic organic or inorganic pollutants from water because of the water pollution during the development of modern industry.1 Among the various toxic pollutants, dye was one of the most serious problems because of the visible color, complex component and low biodegradability.2 Dye was widely used in direct textiles, printing and dyeing. It showed many damages to plants, animals and human beings.3 Therefore, wastewater containing dyes should be treated adequately before being discharged. 4 The development of materials for removal of dyes exhibited considerable importance.Recently, many kinds of materials and nanomaterials such as silica nanoparticles, carbon nanotube, gold nanoparticles and metal oxide nanoparticles were utilized as adsorbents for removal of toxic compounds. [5][6][7][8] Graphene oxide (GO) attracted significant interests due to its high mechanical strength and facile functionalization ability.9 It could be a good material for adsorption owing to the large specific surface area, abundant oxygen containing groups and high water solubility.10-12 Magnetic nanoparticles (MN) were also good in separation of toxic dyes by simply using an ordinary magnet. 13,14 After the combination of MN and GO, magnetic GO (MGO) and related complex nanomaterials were prepared and used in pollution control and sensors were benefited from the advantages of both During the various kinds of applications, many advantages of MGO were demonstrated including high adsorption capacity, easy recycling and improved stability.In this study, tetraethylenepentamine was used in the modification of Fe 3 O 4 magnetic nanoparticle (TMN) Tang et al. 335 Vol. 29, No. 2, 2018 to increase amino group...

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confidence: 96%

Preparation of Tetraethylenepentamine Modified Magnetic Graphene Oxide for Adsorption of Dyes from Aqueous Solution

Tang¹,

Tang²,

Liu³

2017

J. Braz. Chem. Soc.

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“…The capacity is defined as the mass of adsorbed CV divided by the mass of microgels used. The PVA–GO microgels show the capacity of 121.4 mg g −1 , which is approximately two times higher than previous reports that use poly(acrylic acid‐co‐acrylamide) hydrogels and PVA‐modified gum Katira‐GO hydrogel . The hydrolyzed PVA–PAM–GO microgels show the much‐enhanced capacity of 392.9 mg g −1 .…”

Section: Resultsmentioning

confidence: 66%

Composite Microgels Created by Complexation between Polyvinyl Alcohol and Graphene Oxide in Compressed Double‐Emulsion Drops

Choi

Lee

et al. 2019

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Microgels, microparticles made of hydrogels, show fast diffusion kinetics and high reconfigurability while maintaining the advantages of hydrogels, being useful for various applications. Here, presented is a new microfluidic strategy for producing polymer‐graphene oxide (GO) composite microgels without chemical cues or a temperature swing for gelation. As a main component of microgels, polymers that are able to form hydrogen bonds, such as polyvinyl alcohol (PVA), are used. In the mixture of PVA and GO, GO is tethered by PVA through hydrogen bonding. When the mixture is rapidly concentrated in the core of double‐emulsion drops by osmotic‐pressure‐driven water pumping, PVA‐tethered GO sheets form a nematic phase with a planar alignment. In addition, the GO sheets are linked by additional hydrogen bonds, leading to a sol–gel transition. Therefore, the PVA–GO composite remains undissolved when it is directly exposed to water by oil‐shell rupture. These composite microgels can be also produced using poly(ethylene oxide) or poly(acrylic acid), instead of PVA. In addition, the microgels can be functionalized by incorporating other polymers in the presence of the hydrogel‐forming polymers. It is shown that the multicomponent microgels made from a mixture of polyacrylamide, PVA, and GO show an excellent adsorption capacity for impurities.

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“…Goethite is widely used worldwide and has been comprehensively investigated, especially its crystal structure, and many adsorption studies have been performed on these iron minerals, [10] where they displayed a particularly high potential for anions, cations, [11] organic acids, [12] and radioactive elements. [13] For example, Sharrad et al [14] studied the removal of Se(IV) by FeOOH with a high specific surface area (361 m 2 /g). The experimental results show that Se(IV) in wastewater can be quickly and effectively removed in the range of pH 5.0 -9.0, and its adsorption behavior accords with quasi-secondary kinetic model.…”

Section: Introductionmentioning

confidence: 99%

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Liu

Chen

et al. 2019

ChemistrySelect

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A novel adsorbent of magnetic goethite was prepared by neutralisation hydrolysis and employed for Cr(VI) adsorption from aqueous solution. The magnetic goethite adsorbent was characterised by using scanning electron microscopy (SEM), X‐ray diffractometer (XRD), vibrating sample magnetometer (VSM), fourier transform infrared (FTIR), brunauer‐Emmett‐Teller (BET) and X‐ray photoelectron spectroscopy (XPS) method. VSM showed that the prepared adsorbents are super‐paramagnetic iron hydroxide. FTIR spectra revealed that magnetic goethite have ‐OH and other functional groups. The effects of various factors, including pH, adsorbent dosage, initial concentration, and ion concentration, were evaluated. Under the conditions of pH 3, 4 g/L magnetic goethite, 20 mg/L Cr(VI) concentration, and 0.01 mol/L NaNO3, the removal efficiency of Cr (VI) reached 88.2% and the adsorption capacity of the adsorbent reached 4.32 mg/g. The adsorption kinetic tests showed that the adsorption of Cr(VI) on the adsorbent matched well with pseudo‐second‐order kinetics, indicating the occurrence of chemisorption. The fitting of the Langmuir isotherm model showed that the adsorption of Cr(VI) on magnetic goethite was monolayer adsorption. On the other hand, thermodynamic studies conjectured that the adsorption processes of magnetic goethite for Cr(VI) was endothermic and spontaneous. These results suggest that magnetic goethite has great potential for the removal of heavy metals from wastewater.

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Novel magnetic bio-sorbent hydrogel beads based on modified gum tragacanth/graphene oxide: Removal of heavy metals and dyes from water

Cited by 281 publications

References 49 publications

Preparation of Tetraethylenepentamine Modified Magnetic Graphene Oxide for Adsorption of Dyes from Aqueous Solution

Preparation of Tetraethylenepentamine Modified Magnetic Graphene Oxide for Adsorption of Dyes from Aqueous Solution

Composite Microgels Created by Complexation between Polyvinyl Alcohol and Graphene Oxide in Compressed Double‐Emulsion Drops

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

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