Simultaneous catalytic reduction of nitroarenes using silver nanoparticles fabricated in poly(N-isopropylacrylamide-acrylic acid-acrylamide) microgels
Simultaneous catalytic reduction of nitroarenes using silver nanoparticles fabricated in poly(N-isopropylacrylamide-acrylic acid-acrylamide) microgels
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DOI：
10.1016/j.colsurfa.2016.09.076
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发表时间：
2016-12-20
影响因子：
5.2
通讯作者：
Farooqi, Zahoor H.
中科院分区：
文献类型：
--
作者：
Begum, Robina;Naseem, Khalida;Farooqi, Zahoor H.
采用水相沉淀聚合法合成了单分散多响应性聚（N-异丙基丙烯酰胺-丙烯酸-丙烯酰胺）[P（NIPAMAAc-AAm）]聚合物微凝胶。采用原位还原法在微凝胶中制备了银纳米粒子。采用傅里叶变换红外光谱（FTIR）、紫外-可见光谱（UV-vis）、动态光散射（DLS）和透射电镜（TEM）对聚（N-异丙基丙烯酰胺-丙烯酸-丙烯酰胺）[P（NIPAM-AAc-AAm）]微凝胶和银聚（N-异丙基丙烯酰胺-丙烯酸-丙烯酰胺）[Ag-P（NIPAM-AAc-AAm）]杂化微凝胶进行了表征。杂化微凝胶在水介质中具有温度和pH敏感性。它们在各种介质pH条件下具有长期稳定性。将该杂化微凝胶用作催化剂，在水介质中同时还原多种硝基化合物。在Ag-聚（N-异丙基丙烯酰胺-丙烯酸-丙烯酰胺）杂化微凝胶催化剂存在下，邻硝基苯胺（o-NA）、对硝基苯胺（p-NA）、对硝基苯酚（p-NP）和硝基苯（NB）等硝基芳烃分别被硼氢化钠同时还原为相应的氨基芳烃化合物。比较了杂化微凝胶对硝基芳烃单独和同时还原的催化活性。同时吸附的基础上解释了在存在其他硝基芳烃的情况下，每个硝基芳烃的催化还原的延迟。考察了催化剂用量、介质pH值等因素对对硝基苯胺催化还原的影响。对硝基苯胺的还原速率随催化剂用量和介质pH值的增加而增加。(C)© 2016 Elsevier B. V.版权所有。
Monodisperse multi-responsive poly(N-isopropylacrylamide-acrylic acid-acrylamide) [P(NIPAMAAc-AAm)] polymer microgels were synthesized by precipitation polymerization in aqueous medium. Silver nanoparticles were fabricated inside the microgels by in situ reduction method. Poly(N-isopropylacrylamide-acrylic acid-acrylamide) [P(NIPAM-AAc-AAm)] microgels and Agpoly(N-isopropylacrylamide-acrylic acid-acrylamide) [Ag-P(NIPAM-AAc-AAm)] hybrid microgels were characterized by Fourier transform infrared spectroscopy (FTIR), UV-vis spectroscopy (UV-vis), dynamic light scattering (DLS) and transmission electron microscopy (TEM). The hybrid microgels were found to be temperature and pH sensitive in aqueous medium. They have long term stability under various conditions of pH of the medium. The hybrid microgels were used as catalysts for simultaneous reduction of various nitro compounds in aqueous medium. Nitroarenes like o-nitroaniline (o-NA), p-nitroaniline (p-NA), p-nitrophenol (p-NP) and nitrobenzene (NB) were individually and simultaneously reduced to corresponding aminoaromatic compounds by sodium borohydride in the presence of Ag-poly(N-isopropylacrylamide-acrylic acid-acrylamide) hybrid microgels catalyst. Catalytic activity of the hybrid microgels for individual and simultaneous reduction of nitroarenes was compared with each other. The retardation in catalytic reduction of each nitroarene in the presence of other nitroarenes was explained on the basis of simultaneous adsorption. Various factors affecting the catalytic reduction of p-nitroaniline (p-NA) like catalyst dose and pH of the medium were also investigated. Rate of reduction of p-nitroaniline was found to be increased with increase of catalyst dose and pH of the medium. (C) 2016 Elsevier B.V. All rights reserved.