<br>聚（GG-co-AAm-co-MAA）的合成，一种三元聚合物水凝胶，用于去除水溶液中的甲基紫和品红碱性染料,ACS Omega

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聚（GG-co-AAm-co-MAA）的合成，一种三元聚合物水凝胶，用于去除水溶液中的甲基紫和品红碱性染料
ACS Omega ( IF 3.7 ) Pub Date : 2024-02-05 , DOI: 10.1021/acsomega.3c07118
Shahid Khan _{1,

1} , Najeeb Ur Rahman _{1,

1} , Sultan Alam _{1,

1} , Muhammad Zahoor _{1,

1} , Luqman Ali Shah ₂ , Muhammad Naveed Umar ₃ , Riaz Ullah ₄

Affiliation

一种新型吸附剂，称为三元共聚物水凝胶（结冷胶-共-丙烯酰胺-共-甲基丙烯酸）是通过使用N ， N-亚甲基对结冷胶（GG）、甲基丙烯酸（MAA）和丙烯酰胺（AAm）进行自由基聚合来制备的。双丙烯酰胺（MBA）作为交联剂，过硫酸铵（APS）作为反应引发剂。合成的凝胶通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、Brunauer-Emmett-Teller（BET）和热重分析（TGA）进行表征，并用于从水溶液中吸附去除甲基紫 (MV) 和品红碱性 (FB) 染料。评估了研究吸附过程中温度、接触时间、pH 值和浓度对它们的影响。人们发现 Freundlich 等温线和伪二阶动力学模型最适合拟合等温和动力学数据。研究了在不同pH值的蒸馏水中和在中性pH值的自来水中水凝胶的水扩散和膨胀百分比。发现扩散为 Fickian 型，最大膨胀率为 5132%。对 MV 染料的最大吸附容量为 233 mg/g，对 FB 染料的最大吸附容量为 200 mg/g。溶胀和吸附取决于pH值并且随着pH值的增加而增加。两种染料的吸附焓、吉布斯自由能和熵变表明吸附过程是放热的、可行的且自发的。使用丙酮和蒸馏水成功再生水凝胶五个循环，其染料去除效率仍然是原始值的80%。聚(GG- co -AAm -co -MAA)水凝胶成功地从水中去除了选定的染料，因此可以用作从水溶液中去除阳离子染料的有效替代吸附剂。

"点击查看英文标题和摘要"

Synthesis of Poly(GG-co-AAm-co-MAA), a Terpolymer Hydrogel for the Removal of Methyl Violet and Fuchsin Basic Dyes from Aqueous Solution

A novel adsorbent designated as terpolymer hydrogel (gellan gum-co-acrylamide-co-methacrylic acid) was prepared by free radical polymerization of gellan gum (GG), methacrylic acid (MAA), and acrylamide (AAm) using N,N-methylene bis-acrylamide (MBA) as cross-linker and ammonium per sulfate (APS) as the initiator of the reaction. The synthesized gel was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and thermogravimetric analysis (TGA) and was used for the adsorptive removal of methyl violet (MV) and Fuchsin Basic (FB) dyes from aqueous solution. The effect of temperature, contact time, pH, and concentration on them under the study adsorption process was evaluated. Freundlich isotherm and pseudo-second-order kinetic models were found to be best in fitting the isothermal and kinetics data. The water diffusion and % swelling of hydrogel were studied at various pH in distilled water and at neutral pH in tap water. The diffusion was found to be of Fickian type with a maximum swelling of 5132%. The maximum adsorption capacity was 233 mg/g against MV and 200 mg/g against FB dyes. The swelling and adsorption were pH dependent and increased with increase in pH. The enthalpy, Gibbs free energy, and entropy changes of adsorption for both the dyes indicated the adsorption process to be exothermic, feasible, and spontaneous. The hydrogel was successfully regenerated using acetone and distilled water for five cycles and still, its dye removal efficiency was 80% of its original value. The poly(GG-co-AAm-co-MAA) hydrogel successfully removed the selected dyes from water and could thus be used as an efficient alternative sorbent for cationic dye removal from aqueous solutions.

更新日期：2024-02-05

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