Chitosan–silica composite aerogels: preparation, characterization and Congo red adsorption

Wang, Jianquan; Zhou, Qiang; Song, Danqiao; Qi, Bin; Zhang, Yanjiang; Shao, Yizhen; Shao, Ziqiang

doi:10.1007/s10971-015-3800-7

Cited by 50 publications

(24 citation statements)

References 46 publications

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“…Ein weiteres Beispiel rein organischer Verbundaerogele sind Tannin‐Lignin‐Formaldehyd‐Aerogele, bei denen die Aerogele von 24 MPa g −1 cm −3 auf 65 MPa g −1 cm −3 steifer werden, wenn das Tannin/Lignin‐Verhältnis von 1:4 auf 1:1 zunimmt . Die wichtigsten Beispiele für organisch‐anorganischen Hybridaerogele sind Silica‐Hybridaerogele mit Cellulose,, Pectin und Chitosan,, (Tabelle ). Für Silica‐Cellulose wurden zwei verschiedene Ansätze verwendet: entweder wird die Cellulose gelöst und gemeinsam mit Silica geliert, um das Hybridgel zu bilden, oder das Silica‐Sol wird in die Poren eines zuvor gebildeten, silylierten CNF‐Aerogels gegossen .…”

Section: Eigenschaftenunclassified

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Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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Biopolymer‐Aerogele gehören zu den ersten Aerogelen, die hergestellt wurden, aber erst im letzten Jahrzehnt kam es zu einer Belebung der Forschung über Biopolymer‐ und Biopolymer‐Verbundstoff‐Aerogele, die durch Fragen der Nachhaltigkeit, einstellbare spezielle Eigenschaften und einfache Funktionalisierung motiviert wird. Biopolymer‐Aerogele und offenzellige Biopolymer‐Schäume haben Potenzial für klassische Aerogel‐Anwendungen wie Wärmedämmung und neue Anwendungen bei der Filtration, Öl‐Wasser‐Trennung, CO2‐Abscheidung, Katalyse und in der Medizin. Das Gebiet der Biopolymer‐Aerogele wird heute von der empirischen Materialentwicklung auf dem Labormaßstab beherrscht und benötigt eine bessere theoretische Grundlage und Test in Pilotanlagen. Unser Aufsatz umfasst eine Datenbank mit über 3800 Biopolymer‐Aerogel‐Eigenschaften, beurteilt den Forschungsstand auf dem Gebiet und diskutiert wissenschaftliche, technologische und wirtschaftliche Hindernisse bei der Kommerzialisierung dieser faszinierenden Materialien.

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Section: Eigenschaftenunclassified

“…Biopolymer‐Aerogele und ‐Schäume verfügen aufgrund ihrer hohen Porosität, großen Oberfläche und einstellbaren Oberflächenfunktionalität über erhebliches Potenzial auf den Gebieten der Öl‐Wasser‐Trennung, Luftfiltration, Metallionensorption, Farbstoffadsorption und CO 2 ‐Sorption …”

Section: Anwendungenunclassified

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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“…[5][6][7][8] Graphene oxide (GO) attracted significant interests due to its high mechanical strength and facile functionalization ability.…”

Section: Introductionmentioning

confidence: 99%

“…[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.…”

Section: Introductionmentioning

confidence: 99%

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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“…In addition, in order to verify whether the increased uptake resulted in an increase in the inorganic content, TGA measurements were performed on untreated diatoms by heating them in air from 30 to 1000 °C (Fig. 5b) 42 . The initial 3 to 7% weight loss observed below 200 °C was assigned to adsorbed water molecules 43 .…”

Section: Macroscopic Al Distribution and Atomic Coordination Environmmentioning

confidence: 99%

Modifying the thickness, pore size, and composition of diatom frustule in Craspedostauros sp. with Al3+ ions

Soleimani

Rutten

Maddala

et al. 2020

Sci Rep

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Diatoms are unicellular photosynthetic algae that produce a silica exoskeleton (frustule) which exposes a highly ordered nano to micro scale morphology. In recent years there has been a growing interest in modifying diatom frustules for technological applications. This is achieved by adding non-essential metals to the growth medium of diatoms which in turn modifies morphology, composition, and resulting properties of the frustule. Here, we investigate the frustule formation in diatom Pinnularia sp., including changes to overall morphology, silica thickness, and composition, in the presence of Al3+ ions at different concentrations. Our results show that in the presence of Al3+ the total silica uptake from the growth medium increases, although a decrease in the growth rate is observed. This leads to a higher inorganic content per diatom resulting in a decreased pore diameter and a thicker frustule as evidenced by electron microscopy. Furthermore, 27Al solid-state NMR, FIB-SEM, and EDS results confirm that Al3+ becomes incorporated into the frustule during the silicification process, thus, improving hydrolysis resistance. This approach may be extended to a broad range of elements and diatom species towards the scalable production of silica materials with tunable hierarchical morphology and chemical composition.

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Chitosan–silica composite aerogels: preparation, characterization and Congo red adsorption

Cited by 50 publications

References 46 publications

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

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

Modifying the thickness, pore size, and composition of diatom frustule in Craspedostauros sp. with Al3+ ions

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