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首页> 外文期刊>Journal of porous materials >Silver nanoparticle embedded anionic crosslinked copolymer hydrogels: an efficient catalyst
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Silver nanoparticle embedded anionic crosslinked copolymer hydrogels: an efficient catalyst

机译：银纳米粒子嵌入阴离子交联共聚物水凝胶：一种有效的催化剂

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摘要

The present study aimed to synthesize poly(2-acrylamido-2-methyl-1-propansulfonic acid-co-acrylic acid), p(AMPS-c-AA), embedded with silver nanoparticles and to investigate their potential in catalysis. The hydrogels were prepared from 2-acrylamido-2-methyl-1-propansulfonic acid (AMPS) and acrylic acid (AA) monomers via free radical polymerization reaction technique in the mild reaction condition and silver nanoparticles were fabricated within hydrogel by reducing Ag (I) ions using NaBH(4)as reducing agent. The synthesized p(AMPS-c-AA) hydrogel was characterized by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM) and nuclear magnetic resonance spectroscopy (NMR). Silver nanoparticles embedded in p(AMPS-c-AA) hydrogel were visualized by transmission electron microscopy (TEM). The metal content of composites was estimated via atomic absorption spectroscopy (AAS). Applications of this synthesized hydrogel was also investigated by using as a catalyst in the reduction of 4-nitrophenol and H(2)generation from hydrolysis of sodium borohydride (NaBH4). The activation energies, enthalpy, and entropy for 4-NP reduction and NaBH(4)hydrolysis catalyzed by composite were determined. P(AMPS-c-AA)-Ag composite was also used as catalyst in the aerobic oxidation of alcohols by emphasizing the effects of different parameters such as temperature, substituent effect, etc. Finally, recycling of the poly(AMPS-c-AA) hydrogel fabricated with Ag nanoparticles was carried out for four consecutive cycles and no significant loss in catalytic activity was observed.
机译：本研究旨在合成聚（2-丙基酰胺-2-甲基-1-丙烯酸 - 共丙烯酸 - 共丙烯酸），P（AMPS-C-AA），嵌入银纳米粒子并研究其在催化中的潜力。水凝胶由2-丙基酰胺-2-甲基-1-丙酸（AMPS）和丙烯酸（AA）单体通过自由基聚合反应技术在温和的反应条件下，通过还原Ag（I）在水凝胶中制造银纳米粒子（I. ）使用NaBH（4）作为还原剂。通过傅里叶变换红外（FT-IR），扫描电子显微镜（SEM）和核磁共振光谱（NMR），其特征在于合成的P（AMPS-C-AA）水凝胶。通过透射电子显微镜（TEM）可视化嵌入P（AMPS-C-AA）水凝胶中的银纳米粒子。通过原子吸收光谱（AAS）估计复合材料的金属含量。通过在硼氢化钠水解（NaBH4）的水解中，通过用作催化剂，还研究了该合成水凝胶的应用。测定活化能量，焓和熵的4-NP还原和纳米（4）通过复合材料催化的水解。通过强调不同参数如温度，取代基效应等的影响，P（AMPS-C-AA）-Ag复合物也用作醇的有氧氧化氧化的催化剂。最后，聚（AMPS-C-AA的再循环）用Ag纳米颗粒制造的水凝胶进行四个连续循环，并且观察到催化活性的显着损失。

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