Issue 47, 2023, Issue in Progress

Surface-modified silicalite-1-filled PDMS membranes for pervaporation dehydration of trichloroethylene

Abstract

In this study, the impact of silane coupling agents, namely 3-aminopropyltrimethoxysilane (APTMS), trimethylchlorosilane (TMCS), and 1,1,3,3-tetramethyldisilazane (TMDS), on the hydrophobicity of silicalite-1 zeolite was investigated to enhance the pervaporation separation performance of mixed matrix membranes (MMMs) for trichloroethylene (TCE). The hydrophobicity of TMCS@silicalite-1 and TMDS@silicalite-1 particles exhibited significant improvement, as evidenced by the increase in water contact angle from 96.1° to 101.9° and 109.1°, respectively. Conversely, the water contact angle of APTMS@silicalite-1 particles decreased to 85.2°. Silane-modified silicalite-1 particles were incorporated into polydimethylsiloxane (PDMS) to prepare mixed matrix membranes (MMMs), resulting in a significant enhancement in the adsorption selectivity of trichloroethylene (TCE) on membranes containing TMCS@silicalite-1 and TMDS@silicalite-1 particles. The experimental findings demonstrated that the PDMS membrane with a TMDS@silicalite-1 particle loading of 40 wt% exhibited the most favorable pervaporation performance. Under the conditions of a temperature of 30 °C, a flow rate of 100 mL min−1, and a vacuum degree of 30 kPa, the separation factor and total flux of a 3 × 10−7 wt% TCE aqueous solution were found to be 139 and 242 g m−2 h−1, respectively. In comparison to the unmodified silicalite-1/PDMS, the separation factor exhibited a 44% increase, while the TCE flux increased by 16%. Similarly, when compared to the pure PDMS membrane, the separation factor showed an 83% increase, and the TCE flux increased by 20%. These findings provide evidence that the hydrophobic modification of inorganic fillers can significantly enhance the separation performance of PDMS membranes for TCE.

Graphical abstract: Surface-modified silicalite-1-filled PDMS membranes for pervaporation dehydration of trichloroethylene

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Article information

Article type
Paper
Submitted
14 Aug 2023
Accepted
04 Nov 2023
First published
14 Nov 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 33376-33389

Surface-modified silicalite-1-filled PDMS membranes for pervaporation dehydration of trichloroethylene

X. Song, X. Song, B. Liu and Z. Yue, RSC Adv., 2023, 13, 33376 DOI: 10.1039/D3RA05523J

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