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首页> 外文期刊>Journal of Polymers and the Environment >Adsorption of Acidol Red 2BE-NW Dye from Aqueous Solutions on Carboxymethyl Cellulose/Organo-Bentonite Composite: Characterization, Kinetic and Thermodynamic Studies
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Adsorption of Acidol Red 2BE-NW Dye from Aqueous Solutions on Carboxymethyl Cellulose/Organo-Bentonite Composite: Characterization, Kinetic and Thermodynamic Studies

机译：羧甲基纤维素/有机膨润土复合水溶液中酸性红2BE-NW染料的吸附：表征，动力学和热力学研究

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摘要

The combination of biopolymers and clay minerals to form new composite materials offers new horizons and promises to reveal a great potential in the efficient removal of hazardous pollutants from wastewater. The adsorptive removal of Acidol Red 2BE-NW (AR42) with carboxymethyl cellulose/organo-bentonite (CMC/OBent) composite is investigated. The composite is characterized by means of Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetric (TG) analysis, Brunauer-Emmett-Teller (BET) specific surface area and Barret-Johner-Halenda (BJH) pore size distribution analyses. The adsorption of AR42 anionic dye from aqueous solution onto the CMC/OBent composites is assessed by varying parameters such as the mass ratio of CMC to organo-bentonite, the pH value of the dye solution, the temperature, the contact time and the initial dye concentration. The organic modification of bentonite stimulates the intercalation of CMC molecules into the interlayer space of organo-bentonite. An intermolecular as well as an intramolecular linkage (interaction) among CMC molecules and organo-bentonite platelets is observed as evidenced by the FT-IR analysis. Dye equilibrium uptake is reached within 60min, yielding a maximum dye sorption of 91.14% at a pH of 5.2, with an adsorption capacity of 29.16mg/g at 25 degrees C. Adsorption kinetics of AR42 onto the CMC/OBent composite is best described by a pseudo second-order mechanism, while its adsorption isotherm fits well into the Freundlich equation. The potential for AR42 dye removal with CMC/OBent composite is discussed.
机译：生物聚合物和粘土矿物质的组合形成新的复合材料，提供了新的视野，并承诺揭示有效剥离废水的危险污染物的巨大潜力。研究了用羧甲基纤维素/有机膨润土（CMC /令人失败）复合材料的酸性红色2BE-NW（AR42）的吸附除去。复合材料的特征在于傅立叶变换红外（FT-IR）光谱，X射线衍射（XRD），扫描电子显微镜（SEM），热重量（TG）分析，Brunauer-Emmett-Teller（Bet）特定表面地区和啤酒毛毯 - 嗜睡 - 宿舍（BJH）孔径分布分析。通过改变参数，例如CMC与有机膨润土的质量比，染料溶液的pH值，温度，接触时间和初始染料，通过改变参数来评估来自水溶液的AR42阴离子染料在CMC /令人失效复合材料上的吸附是评估的专注。膨润土的有机改性刺激了CMC分子的插入到有机膨润土中的层间空间中。观察到CMC分子和有机膨润土血小板中的分子间以及分子内连杆（相互作用），如FT-IR分析所证明。在60mIn内达到染料平衡摄取，在pH为5.2的pH值下产生91.14％的最大染料吸附，其吸附容量为29.16mg / g，25℃。AR42的吸附动力学在CMC /令人失常的复合材料中最好描述伪二阶机制，而其吸附等温线很适合Freundlich方程。讨论了用CMC /令人失败的复合材料去除AR42染料的可能性。

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