Ahmad Azhar, Roy Prashun Ghosh, Hassan Ahmad, Zhou Shuiqin, Azam Muhammad, Sial Muhammad Aurang Zeb Gul, Irfan Ahmad, Kanwal Farah, Begum Robina, Farooqi Zahoor H
School of Chemistry, University of the Punjab, New Campus, Lahore 54590, Pakistan.
Department of Chemistry of The College of Staten Island and Ph.D. Program in Chemistry of The Graduate Centre, The City University of New York, Staten Island, NY 10314, United States.
Int J Biol Macromol. 2024 Dec;283(Pt 4):137965. doi: 10.1016/j.ijbiomac.2024.137965. Epub 2024 Nov 22.
Precipitation polymerization method was used to synthesize chitosan based poly[chitosan-N-isopropylmethacrylamide-acrylic acid] [P(CS-NI-AA)] microgel particles. Synthesized P(CS-NI-AA) microgel particles were utilized as micro-reactors for the fabrication of silver nanoparticles (AgNPs) inside the structure of microgels through chemical reduction of Ag ions using NaBH as reducing agent. P(CS-NI-AA) and Ag-P(CS-NI-AA) systems were analyzed using various characterization techniques like scanning electron microscopy (SEM), ultraviolet-visible (UV-visible) spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Catalytic activity of Ag-P(CS-NI-AA) for individual and simultaneous degradation of various dyes like methylene blue (MB), Congo red (CR), brilliant blue (Bb), methyl orange (MO) and Rhodamine B (RB) was investigated in aqueous phase using NaBH as reductant. The Pseudo 1st order rate constant (k) for dyes degradation were evaluated. The Ag-P(CS-NI-AA) hybrid system was observed to be efficient, low-cost and stable catalyst for quick degradation of dyes.
采用沉淀聚合法合成了基于壳聚糖的聚[壳聚糖 - N - 异丙基甲基丙烯酰胺 - 丙烯酸][P(CS - NI - AA)]微凝胶颗粒。通过使用硼氢化钠（NaBH）作为还原剂化学还原银离子，将合成的P(CS - NI - AA)微凝胶颗粒用作微反应器，在微凝胶结构内部制备银纳米颗粒（AgNPs）。使用扫描电子显微镜（SEM）、紫外可见（UV - visible）光谱、透射电子显微镜（TEM）、X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱等各种表征技术对P(CS - NI - AA)和Ag - P(CS - NI - AA)体系进行了分析。以硼氢化钠（NaBH）作为还原剂，研究了Ag - P(CS - NI - AA)对亚甲基蓝（MB）、刚果红（CR）、亮蓝（Bb）、甲基橙（MO）和罗丹明B（RB）等各种染料在水相中单独和同时降解的催化活性。评估了染料降解的拟一级反应速率常数（k）。观察到Ag - P(CS - NI - AA)杂化体系是一种高效、低成本且稳定的催化剂，可快速降解染料。
