Hydroxyl-functionalized ultra-thin graphitic-carbon-nitrite nanosheets-accommodated polyvinyl alcohol membrane for pervaporation of isopropanol/water mixture,Journal of the Taiwan Institute of Chemical Engineers

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Hydroxyl-functionalized ultra-thin graphitic-carbon-nitrite nanosheets-accommodated polyvinyl alcohol membrane for pervaporation of isopropanol/water mixture
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2021-11-10 , DOI: 10.1016/j.jtice.2021.10.026
HyeonTae Shin ₁ , DongUk Lee ₁ , Shivshankar Chaudhari ₁ , SeungYong Choi ₁ , Kie Yong Cho ₁ , MinYoung Shon ₁ , SeungEun Nam ₂ , YouIn Park ₂

Affiliation

Backgrounds

This report describes, for pervaporation dehydration of IPA/water mixtures, different types of g-C3N4 nanosheets accommodated in a polyvinyl alcohol matrix, and coating on an alumina hollow fiber membranes were fabricated.

Methods

Namely, bulk g-C3N4 (BCN), from the thermal polymerization of a melamine precursor, followed by its exfoliation by acid treatment to prepare acid-treated g-C3N4 (ACN), further hydroxyl functionalization by glycidol treatment to obtain glycidol-modified g-C3N4 (GCN) were synthesized. As-synthesized BCN, ACN, and GCN sheets were characterized using FTIR, XRD, XPS, and AFM techniques. Dispersion of the BCN, ACN and GCN sheets in the PVA matrix was confirmed by FE- SEM, FT-IR, and DSC studies. Owing to the interfacial interaction between the g-C3N4 sheets and PVA, the mechanical strength of the membrane increased; it was more profound for GCN sheets accommodated membrane that attributed to hydrogen bonding interactions due to glycidol modification confirmed.

Significant Findings

In pervaporation tests, at a fixed content (2 wt.%) for evaluating the modification effect, the best performance was obtained (flux= 0.199 kg/m2h and separation factor 139.8) with the GCN type g-C3N4 sheets accommodation amidst three types of g-C3N4 nanosheet-accommodated membranes delivered at an 80/20 (w/w, (IPA)/water) feed mixture at 40 °C.

中文翻译：

用于异丙醇/水混合物全蒸发的羟基功能化超薄石墨-碳-亚硝酸盐纳米片-可容纳聚乙烯醇膜

背景

该报告描述了，对于 IPA/水混合物的全蒸发脱水，不同类型的 g-C3N4 纳米片容纳在聚乙烯醇基体中，并在氧化铝中空纤维膜上进行了涂层。

方法

即，本体g-C3N4（BCN），由三聚氰胺前驱体热聚合，然后通过酸处理将其剥离以制备酸处理的g-C3N4（ACN），通过缩水甘油处理进一步羟基官能化以获得缩水甘油改性的g-C3N4（ACN）。合成了-C3N4 (GCN)。使用 FTIR、XRD、XPS 和 AFM 技术对合成的 BCN、ACN 和 GCN 片材进行表征。FE-SEM、FT-IR 和 DSC 研究证实了 BCN、ACN 和 GCN 片材在 PVA 基质中的分散。由于g-C3N4片材与PVA之间的界面相互作用，膜的机械强度增加；由于缩水甘油修饰而导致的氢键相互作用，对于 GCN 片材容纳膜来说更为深刻。