Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study

Golor, Maria Melania, Rosma, Dessy, Santoso, Shella Permatasari, Soetaredjo, Felycia Edi, Yuliana, Maria, Ismadji, Suryadi and Ayucitra, Aning (2020) Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study. Citric Acid-crosslinked Cellulosic Hydrogel from Sugarcane Bagasse: Preparation, Characterization, and Adsorption Study, 3 (27). pp. 59-67. ISSN 26865947, 19076789

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Abstract

In this work, citric acid (CIT) is proposed as a harmless alternative to epichlorohydrin (ECH) for crosslinking in the synthesis of cellulose hydrogels. Sugarcane bagasse was utilized as a source of cellulose fibers. Cellulose fibers were disintegrated using the solvent-dissolution method before forming a gel-like solution. Subsequently, CIT was added to initiate crosslinking, and the behavior was evaluated by adding various amounts of citric acid (0, 20, 30, and 40 wt%). Cellulose hydrogel with a good mechanical strength (10 mm penetration depth) was obtained from crosslinking using 40 wt% of CIT (HCIT-4), which is comparable to ECH-cross-linked hydrogel (HECH) that has a penetration depth of 8 mm. A proper amount of CIT molecules allows the crosslinking of the cellulose fibers into the hydrogel. The FT-IR analysis reveals a C-OC band blue-shifting for HCIT-4 compared to HECH, with a gap difference of 82 cm-1. The crystallinity from XRD patterns of HCIT-4 is comparable to that of HECH, which confirms that CIT can be used as a substitute for ECH. The adsorption ability was evaluated against methylene blue dye, the isotherm and kinetic adsorption models for the adsorption system were determined. Freundlich and pseudo-second-order models correlate well to isotherm and kinetics data, suggests that the adsorbent possesses heterogeneous surface sites which adsorption controlled by chemisorption. The prepared HCIT-4 was able to remove 24.88 mg methylene blue/g of the hydrogel at 70 °C, meanwhile HECH only able to remove 12.01 mg/g. The adsorption capacity was increased when adsorption temperature increased, suggesting endothermic behavior. Content from this work may be used under the terms of the a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) License Keywords: Adsorption, Cellulose, Citric acid, Crosslinking, Hydrogel Acknowledgment The authors are grateful to the Widya Mandala Surabaya Catholic University for the financial support of this work through an LPPM research grant 0657/WM01/N/2019. This work is also supported by the National Taiwan University of Science and Technology through joint research collaboration. A hydrogel material prepared by using cellulose polymer. Citric acid was used as the “green” crosslinker, instead of toxic compound epichlorohydrin. The prepared hydrogel has a porous cross-sectional morphology. The hydrogel is shown a potentiality in adsorption of dye, such as methylene blue. This ability of hydrogel can be very useful in wastewater management.

Item Type:	Article
Uncontrolled Keywords:	Adsorption, Cellulose, Citric acid, Crosslinking, Hydrogel
Subjects:	Engineering > Chemical Engineering
Divisions:	Journal Publication
Depositing User:	F.X. Hadi
Date Deposited:	14 Jul 2022 07:53
Last Modified:	03 Aug 2022 02:27
URI:	http://repository.ukwms.ac.id/id/eprint/31550

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