Facile fabrication of carboxymethyl cellulose sodium/graphene oxide hydrogel microparticles for water purification

Liu, Jingjing; Chu, Huijuan; Wei, Hongliang; Zhu, Heguo; Wang, Gang; Zhu, Jing; He, Juan

doi:10.1039/c6ra06438h

Cited by 83 publications

(30 citation statements)

References 58 publications

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“…16g–i ). The {002} planes of graphene with a lattice spacing of 0.32 nm 41 – 44 are also seen in HRTEM of the graphenic carbon fragments formed on Ag NPs by irradiation in C 2 H 4 (Fig. 3e ).…”

Section: Resultsmentioning

confidence: 77%

In situ formation of catalytically active graphene in ethylene photo-epoxidation

et al. 2018

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Ethylene epoxidation is used to produce 2 × 107 ton per year of ethylene oxide, a major feedstock for commodity chemicals and plastics. While high pressures and temperatures are required for the reaction, plasmonic photoexcitation of the Ag catalyst enables epoxidation at near-ambient conditions. Here, we use surface-enhanced Raman scattering to monitor the plasmon excitation-assisted reaction on individual sites of a Ag nanoparticle catalyst. We uncover an unconventional mechanism, wherein the primary step is the photosynthesis of graphene on the Ag surface. Epoxidation of ethylene is then promoted by this photogenerated graphene. Density functional theory simulations point to edge defects on the graphene as the sites for epoxidation. Guided by this insight, we synthesize a composite graphene/Ag/α-Al2O3 catalyst, which accomplishes ethylene photo-epoxidation under ambient conditions at which the conventional Ag/α-Al2O3 catalyst shows negligible activity. Our finding of in situ photogeneration of catalytically active graphene may apply to other photocatalytic hydrocarbon transformations.

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Section: Resultsmentioning

confidence: 77%

In situ formation of catalytically active graphene in ethylene photo-epoxidation

et al. 2018

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“…The stretching vibration of O−H blue shifts to 3433 cm −1 , which indicates the formation of the composite is facilitated by H-bonding interaction between CGO and CMC. On the other hand, the carbonyl stretch of carboxylate groups of CMC was overlapped with that of carboxylic groups of CGO at about 1577 cm −1 , which is attributable to the interaction between the hydroxyl groups of CMC and the carboxyl groups of CGO [ 44 , 53 ]. In addition, it is worthwhile mentioning that the new peak at 1654 cm −1 is assigned to −NH(R) functional groups [ 54 ], suggesting that EDA produced a covalent bond during cross-linking with CGO, in consistent with the Raman analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Zhang Y. et al prepared CMC/GO monoliths (GO, 0.2~5.0 wt %) by a unidi-rectional freeze-drying method, and proved that the adsorption efficiency of multiple heavy metal ions was improved [ 43 ]. Liu J. et al fabricated CMC/GO hydrogel microparticles (GO, 2~8 wt %) via spray drying, and found that these hydrogel microparticles can effectively improve the adsorption capacity of dye molecules (59 mg·g −1 for methylene blue and 66 mg·g −1 for Eosin Y) [ 44 ]. Varaprasad K. et al conducted preparation on dye removal CMC-Acrylamide-GO hydrogels (GO, 0.05~0.14 wt %) by a free-radical polymerization method; the resulting maximum acid blue absorption capacity was 185.45 mg·g −1 [ 45 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Ultra-Light Coal-Based Graphene Oxide Aerogel for Efficient Removal of Dyes from Aqueous Solutions

Xing

Zheng

et al. 2018

Nanomaterials

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A novel carboxymethyl cellulose (CMC)-supported graphene oxide aerogel (CGOA) was fabricated from a cost-effective and abundant bituminous coal by a mild hydrothermal process and freeze-drying treatment. Such an aerogel has cross-linked graphene oxide layers supported by CMC, and therefore, displays high mechanical strength while having ultra-low density (8.257 mg·cm−3). The CGOA has a 3D interconnected porous structure, beneficial graphene framework defects and abundant oxygen-containing functional groups, which offer favorable diffusion channels and effective adsorption sites for the transport and adsorption of dye molecules. The adsorption performance of rhodamine B by an optimized CGOA shows a maximum monolayer adsorption capacity of 312.50 mg·g−1, as determined by Langmuir isotherm parameters. This CGOA exhibited a better adsorption efficiency (99.99%) in alkaline solution, and satisfactory stability (90.60%) after three cycles. In addition, adsorption experiments on various dyes have revealed that CGOA have better adsorption capacities for cationic dyes than anionic dyes.

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“…The CMCNa presents characteristic peaks at 1595 cm -1 (stretching vibration of carboxylate group), 3402 cm -1 (O-H stretching vibration), 2912 cm -1 (C-H stretching vibration), 1421 cm -1 (-CH2 scissoring vibration), 1322 cm -1 (-OH bending vibration), 1060 cm -1 , (>CH-O-CH2 stretching vibrations), respectively (Liu et al, 2016). The structure of CollCMCNa presented many changes compared with control one (Coll -AX 3.1.)…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Collagen - Carboxymethylcellulose Materials for Lenses

Burdușel¹,

Stancu²,

Mihai³

et al. 2016

The International Conference on Advanced Materials and Systems

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Cataract is one of the most common causes of blindness for people over 40 years old. Hydrogels are three -dimensional structures with increased properties which can be successful used in medical application such prosthesis or intraocular soft contact lenses. Sodium carboxymethylcellulose (CMC -Na) is the cheaper option currently available on the market with properties like biocompatibility similar with pHEMA. The aim of this study was to develop polymeric crystalline materials based on collagen (COL) and carboxymethylcellulose cross-linked with EDC/NHS for cataracts or other eye-disease. Type I fibrillar collagen gel with various ratios of CMC-Na hydrogels were lyophilized and tests tested by optic and scanning electronic microscopy, FT-IR spectroscopy and water absorption. The obtained gels were crosslinked with EDC/NHS and lyophilized in order to obtain spongious forms. They are porous structures with pore sizes between 25-81 µm. The samples with CMCNa presented more uniform and dense matrices and the crosslinked ones are more resistant, being more proper as material for lenses for be used in cataract.

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Facile fabrication of carboxymethyl cellulose sodium/graphene oxide hydrogel microparticles for water purification

Abstract: Carboxymethyl cellulose sodium (CMCNa)/graphene oxide (GO) hydrogel microparticles (CGs) with the diameter of 2.2–3.6 μm were prepared facilely via spray drying and used as adsorbents for water purification.

Cited by 83 publications

References 58 publications

In situ formation of catalytically active graphene in ethylene photo-epoxidation

In situ formation of catalytically active graphene in ethylene photo-epoxidation

Hydrothermal Synthesis of Ultra-Light Coal-Based Graphene Oxide Aerogel for Efficient Removal of Dyes from Aqueous Solutions

Development and Characterization of Collagen - Carboxymethylcellulose Materials for Lenses

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