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首页> 外文期刊>Journal of Polymers and the Environment >Microfluidic Fabrication of Nanoparticles Based on Ethyl Acrylate-Functionalized Chitosan for Adsorption of Methylene Blue from Aqueous Solutions
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Microfluidic Fabrication of Nanoparticles Based on Ethyl Acrylate-Functionalized Chitosan for Adsorption of Methylene Blue from Aqueous Solutions

机译：基于丙烯酸乙酯功能化壳聚糖的纳米粒子微流体制备从水溶液中吸附亚甲基蓝

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The adsorption of nanoparticle (NP)-based adsorbents especially those made of polymers to remove dyes as toxic substances from pollutants is yet remained as a critical issue. The objective of this work was to prepare microfluidic (MF) fabrication of NPs based on ethyl acrylate (EA)-functionalized chitosan (CS) for methylene blue (MB) dye removal from aqueous solutions. For this purpose, a series of experiments such as FTIR, SEM alongside DLS, and UV-vis spectrophotometry were carried out to investigate the physicochemical properties of the samples. The FTIR spectra showed that the amine (-NH2) and hydroxyl (-OH) groups on CS structure were replaced with EA, appropriately. The SEM and DLS results depicted that EA-functionalized CS NPs fabricated using MF technique had uniform shapes, and the diameters as small as 70nm compared to those samples produced via bulk mixing (BM) method (similar to 300nm). Moreover, the surface charge of MF-assisted CS NPs after functionalization exhibited the lower zeta potential value (similar to+11) than that of samples based on BM (similar to+14) due to occurring the laminar flow through the micro-channels embedded in the MF chip, leading to an increase in the MB adsorption. Subsequently, at the optimized amounts of the dye concentration (89.12mgL(-1)), the adsorbent concentration (1.38gL(-1)), and pH (10.58) by means of Box-Behnken design (BBD) method, the maximum percentage of MB removal by the use of MF-fabricated EA-functionalized CS NPs was 98.4%. By fitting the obtained adsorption data to the isotherm models such as Lagmuir, Freundlich, and Temkin, it has been found that the adsorption mechanism followed the Langmuir model (maximum capacity of the adsorption 384.61mg/g), which assumed a monolayer coverage of MB molecules as adsorbates over a homogeneous adsorbent surface.
机译：纳米颗粒（NP）基吸附剂的吸附，尤其是由聚合物制成的吸附剂，以去除污染物中的有毒物质染料，仍然是一个关键问题。这项工作的目的是准备基于丙烯酸乙酯（EA）官能化壳聚糖（CS）的NP的微流（MF）制备，用于从水溶液中去除亚甲基蓝（MB）染料。为此，进行了一系列实验，如FTIR，SEM和DLS以及紫外可见分光光度法，以研究样品的理化性质。 FTIR光谱表明，CS结构上的胺（-NH2）和羟基（-OH）被EA适当取代。 SEM和DLS结果表明，使用MF技术制造的EA功能化CS NP具有均匀的形状，与通过本体混合（BM）方法生产的样品（类似于300nm）相比，直径小至70nm。此外，由于发生了通过嵌入微通道的层流，功能化后MF辅助的CS NPs的表面电荷显示出比基于BM的样品更低的ζ电位值（近似于+11）（近似于+14）。在MF芯片中，MB吸附增加。随后，通过Box-Behnken设计（BBD）方法，以最佳的染料浓度（89.12mgL（-1）），吸附剂浓度（1.38gL（-1））和pH（10.58）达到最大使用MF制造的EA功能化CS NP去除MB的百分比为98.4％。通过将获得的吸附数据拟合到等温模型（如Lagmuir，Freundlich和Temkin），发现吸附机理遵循Langmuir模型（最大吸附量384.61mg / g），假定MB被单层覆盖分子在均匀的吸附剂表面上被吸附。

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