A. S. M. Maruf Galib, Md. Muhyminul Islam, Md. Asheq Mahamud, Md. Abdur Rahman, Md. Shamim Hossan, Hasan Ahmad, Md. Abdul Jalil Miah, Md. Mahbubor Rahman, Md. Ashraful Alam
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In the final step, amide groups (-CONH<sub>2</sub>) were partially transformed into primary amine (-NH<sub>2</sub>) groups via a <i>Hoffmann</i> degradation reaction. The functionalization was validated using conventional diazonium salt and Schiff base formation assays, as well as Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (<sup>1</sup>H-NMR) spectroscopy. Moreover, scanning electron microscopy (SEM) images showed uniform, spherical particles with a smooth texture. Additionally, dynamic light scattering (DLS) and zeta potential measurements showed pH-dependent changes in particle size and surface charge. The amphiprotic nature of the PS/P(AA-AAm-EGDMA)-NH₂ composites was demonstrated through adsorption capacities of 1.132 mmol g⁻<sup>1</sup> for anionic sodium dodecyl sulfate (SDS) at pH 4 and 0.74 mmol g⁻<sup>1</sup> for cationic hexadecyltrimethylammonium bromide (HTABr) at pH 10. 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引用次数: 0
摘要
目前，表面功能化聚合物复合材料是吸附水和空气中各种污染物的有前途的候选材料之一。在这项研究中，我们报道了胺功能化聚苯乙烯/聚丙烯酸-丙烯酰胺-乙二醇二甲丙烯酸酯[PS/P(AA-AAm-EGDMA)- nh2]复合材料的合成。聚苯乙烯（PS）颗粒最初是通过分散聚合生产的。随后，丙烯酸（AA）和丙烯酰胺（AAm）在PS粒子作为种子存在下共聚。以乙二醇二甲基丙烯酸酯（EGDMA）为交联剂制备了PS/P（AA-AAm-EGDMA）复合材料。在最后一步，酰胺基团（-CONH2）通过Hoffmann降解反应部分转化为伯胺（-NH2）基团。利用传统的重氮盐和希夫碱形成实验，以及傅里叶变换红外（FTIR）和质子核磁共振（1H-NMR）光谱对功能化进行了验证。此外，扫描电镜（SEM）图像显示均匀的球形颗粒具有光滑的纹理。此外，动态光散射（DLS）和zeta电位测量显示了ph依赖性颗粒大小和表面电荷的变化。PS/P(AA-AAm-EGDMA)-NH₂复合材料的两亲性通过对pH值为4的阴离子十二烷基硫酸钠（SDS）和pH值为10的阳离子十六烷基三甲基溴化铵（HTABr）的吸附量分别为1.132 mmol g⁻和0.74 mmol g⁻证实。值得注意的是，该聚合物复合物的CO₂吸附量为7.143 mmol g -毒发展，明显高于未修饰的PS/P(AA-AAm-EGDMA) （1.668 mmol g -毒发展），在三次再生循环后，其吸附效率仍保持在初始吸附效率的61.1%。这些发现强调了PS/P(AA-AAm-EGDMA)-NH₂复合材料作为高效可回收的吸附剂从水溶液中去除CO₂的潜力。图形抽象
Di-functional pH-responsive amphiprotic polymer composite particles for efficient adsorption of aqueous CO2
Nowadays, surface-functionalized polymer composites are one of the promising candidates for adsorbing a wide range of contaminants from water and air. In this study, we report the synthesis of amine-functionalized polystyrene/poly(acrylic acid-acrylamide-ethylene glycol dimethacrylate) [PS/P(AA-AAm-EGDMA)-NH₂] composites for aqueous CO₂ adsorption. Polystyrene (PS) particles were initially produced via a dispersion polymerization. Subsequently, acrylic acid (AA) and acrylamide (AAm) were copolymerized in the presence of the PS particles as seeds. Ethylene glycol dimethacrylate (EGDMA) was used as a cross-linker to form PS/P(AA-AAm-EGDMA) composites. In the final step, amide groups (-CONH2) were partially transformed into primary amine (-NH2) groups via a Hoffmann degradation reaction. The functionalization was validated using conventional diazonium salt and Schiff base formation assays, as well as Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy. Moreover, scanning electron microscopy (SEM) images showed uniform, spherical particles with a smooth texture. Additionally, dynamic light scattering (DLS) and zeta potential measurements showed pH-dependent changes in particle size and surface charge. The amphiprotic nature of the PS/P(AA-AAm-EGDMA)-NH₂ composites was demonstrated through adsorption capacities of 1.132 mmol g⁻1 for anionic sodium dodecyl sulfate (SDS) at pH 4 and 0.74 mmol g⁻1 for cationic hexadecyltrimethylammonium bromide (HTABr) at pH 10. Notably, the polymer composite exhibited a CO₂ adsorption capacity of 7.143 mmol g⁻1, significantly higher than the unmodified PS/P(AA-AAm-EGDMA) (1.668 mmol g⁻1), retaining 61.1% of its initial adsorption efficiency following three regeneration cycles. These findings underscore the potential of PS/P(AA-AAm-EGDMA)-NH₂ composites as highly efficient and recyclable adsorbents for CO₂ removal from aqueous solutions.
期刊介绍：
"Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad.
"Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."
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