Polyethylenimine Grafted Chitosan Nanofiber Membrane as Adsorbent for Selective Elimination of Anionic Dyes
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Polyethylenimine Grafted Chitosan Nanofiber Membrane as Adsorbent for Selective Elimination of Anionic Dyes Xinwen Gong1, Dongxue Yang1, Nannan Wang2*, Shian Sun3, Jun Nie1, and Guiping Ma1* 1
Beijing Laboratory of Biomedical Materials, Key Laboratory of Biomedical Materials of Nature Macromolecules, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China 2 School of Resources, Environment and Materials, Guangxi University, Guangxi 530004, China 3 Department of Aviation Quartermaster and Fuel, Air Force Logistics College, Xuzhou, Jiangsu 221000, China (Received December 8, 2019; Revised February 7, 2020; Accepted February 10, 2020) Abstract: In order to improve the adsorption capacity of chitosan to organic dyes, the amino rich functionalized chitosan electrospun nanofibers membrane was prepared. In the process of high efficiency synthesis, PGMA and PEI were grafted on the surface of CS NFMs in turn. By means of XRD, ATR-FTIR and XPS, the successful introduction of amino group into CS was confirmed. The selective adsorption capacity of CS-PGMA-PEI NFMs for anionic dyes was studied. The adsorption kinetics analysis shows that the adsorption process of CS-PGMA-PEI NFMs is mainly pseudo second-order model. Its adsorption isotherms can be described by the Langmuir model and it conforms to monolayer adsorption. The maximum adsorption capacity of Congo red calculated by Langmuir model is 657.47 mg/g. CS-PGMA-PEI NFMs has selective adsorption capacity for Congo red/methylene blue mixture. CS-PGMA-PEI NFMs also showed good circulation stability. This study provides a method for the synthesis of water purification membrane. Keywords: Electrospun nanofibers, Chitosan, Dye removal, Selective adsorption
for the adsorption of dyes [21-23]. As a natural polymer with a wide range of sources, Chitosan (CS) is hydrophilic, biodegradable and non-toxic [24,25]. CS matrix as adsorbent material can not only reduce the cost but also avoid environmental pollution. However, due to the limited functional groups (-NH2, -OH) on CS molecules, its adsorption performance is limited. Polyethyleneimine (PEI) as a nontoxic water-soluble polymer, its molecular chain contains much primary amine (-NH2), secondary amine (-NH-) and tertiary amine (-N=) groups [26,27]. As a functional group, amino group has a lone pair electrons on the N atom, which can share electrons with the transition metal with an empty atomic orbital to form an amine-metal complex [28]. In addition, the amino group is easily protonated, it can adsorb anionic dyes by electrostatic interaction [29]. These properties make PEI as ideal adsorbent and are widely used in the treatment of dye-containing wastewater. In this study, the preparations of the CS-PGMA-PEI NFMs were followed by the previous report [30]. The obtained NFMs were used in a range of adsorption experiments to evaluate the influences of initial value of pH, temperature, original concentration, and adsorption time on dye
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