Patching NaA zeolite membrane by adding methylcellulose into the synthesis gel

Wei, Xueling; Liang, Shuai; Xu, Yao-Yi; Sun, Yali; An, Jun-Fang; Chao, Zi‐Sheng

doi:10.1016/j.memsci.2016.12.015

Cited by 27 publications

(9 citation statements)

References 46 publications

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“…As for CSMCF1 and CSMCF2, the broad peak around 22° could be attributed to the intermolecular hydrogen bonding along with a short-distance order for the sample chains in the methylcellulose polymer [35]. The XRD data demonstrated that the crystal structure of methylcellulose in the films was consistent with the JCPDS file #003–0192 (a file that contains the standard diffraction pattern for methylcellulose), which possessed the cellulose phase [36]. With the presence of chitosan and methylcellulose, the characteristic peaks were visible for both chitosan and methylcellulose, but broader gradually, which may be due to the interaction among CS and MC molecules and the miscibility at the molecular level.…”

Section: Resultsmentioning

confidence: 90%

Effect of Sodium Trimetaphosphate on Chitosan-Methylcellulose Composite Films: Physicochemical Properties and Food Packaging Application

Wang

Liao

et al. 2019

Polymers

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Environmentally friendly food packaging currently attracts much interest. Sodium trimetaphosphate (STMP) finds specialized applications in food, but it is rarely used as a crosslinking agent. In this study, STMP was used as a crosslinking agent to prepare chitosan/methylcellulose composite films. Both antibacterial and physicochemical properties of the composite film were improved by crosslinking with STMP. The crosslinked films, with good antibacterial activity (~99%), had increased tensile strength, a higher elongation at break, a lower swelling ratio and solubility, and a lower enzymatic degradation than the non-crosslinked films. Furthermore, the crosslinked films showed an excellent preservative effect on fresh-cut wax gourd after three days at room temperature. The obtained films crosslinked by STMP can be potentially applied to the food industry, such as food functional packaging, providing a novel alternative to traditional plastic packages.

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Section: Resultsmentioning

confidence: 90%

Effect of Sodium Trimetaphosphate on Chitosan-Methylcellulose Composite Films: Physicochemical Properties and Food Packaging Application

Wang

Liao

et al. 2019

Polymers

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“…The selectivities so far reported for NaA zeolite membranes slightly exceed the Knudsen diffusion coefficients, indicating a predominance of this mechanism over the molecular sieve (Xu et al 2018;Kondo et al 1997;Aoki et al 1998Aoki et al , 2000Chen et al 2005;Wei et al 2017). In general, these low selectivities are attributed to the gas permeation through the non-zeolitic pores (intercrystalline defects in the zeolite film).…”

Section: Zeolitic and Non-zeolitic Contribution To The Overall Fluxmentioning

confidence: 88%

NaA zeolite membranes on modified porous stainless steel supports: a comparative study of different SiO2 sources

Galeano

Tarditi

Cornaglia

2020

Braz. J. Chem. Eng.

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The deposition of a NaA zeolite layer on porous stainless steel substrates was optimized in order to obtain composite membranes for hydrogen separation. The effect of the silica source on NaA zeolite crystallinity and morphology was studied using two synthesis routes: concentrated gel and clear solution. The optimized synthesis conditions were applied for the synthesis of NaA zeolite layers on top of porous stainless steel disks or on the outer surface of tubular supports. SEM and XRD measurements confirmed that the use of rice husk allowed obtaining defect free and pure phase NaA zeolite membranes. Selectivity values similar to those published for NaA zeolite membranes based on ceramic substrates were obtained using zeolite layers deposited on porous stainless steel tubes. From the curve fitting of the experimental data, the contribution of zeolitic and non-zeolitic flux was estimated. For the membranes synthesized from a concentrated gel, H 2 showed a predominated contribution of the zeolitic flux.

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“…They were carried out over self-designed equipment, which was similar to that reported in literature. 19 2.7.1 Gas permeation. The disc was sealed in the permeation cell with the membrane layer on the high-pressure side.…”

Section: Performance Of Silicalite-1 Membranesmentioning

confidence: 99%