Polymer microgel-based gold nanocomposites for reductive degradation of azo dyes
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Abstract:
Stimuli responsive polymer microgels have gained attention due to their envisioned applications.The aim of this study is to organize Au-based poly(N-isopropylmethacrylamide-co-acrylamide) [Au-p-(NIPMAM-co-AAm)] microgels and to analyse their degradation potential.Microgels were analyzed via UV-Visible (ultraviolet-visible) spectroscopy, X-ray diffraction and Fourier-transform infrared spectroscopy.Reductive degradation of Congo red (CR) was done to evaluate the catalytic activity of Au-based p-(NIPMAM-co-AAm) microgels that converts CR into less toxic products, that is, sodium 4-amino-1-naphthalene sulfate and biphenyl.Kinetic study of reaction reveals first order reaction and by altering the concentration of Congo red (CR) dye from 0.02 to 0.095 mM, the change in apparent rate constant (k app ) was noted from 0.0027 to 0.1235 min -1 .Whereas the change in value of rate constant (k app ) was observed from 0.0716 to 0.2931 min -1 as catalytic dose was changed from 0.06 to 0.1 mL (60-100 µL) at certain temperature.Reduction efficiency of recycled Au-based p-(NIPMAM-co-AAm) was also deliberated and not any remarkable reduction was observed in the percentage catalytic efficiency of nanocomposite until four cycles.Keywords:
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基于 Cu 的 thermosensitive nanocomposites 被高精力球 milling 做。基于 Cu 的 thermosensitive nanocomposites 的微观结构和性质被传播电子显微镜学(TEM ) 和 themosensitivity 测试学习。milling 时间在微观结构的效果和基于 Cu 的 nanocomposite 材料的 thermosensitivity 被研究。基于 Cu 的 nanocomposite 能被高精力球 milling 做的 Theresults 表演。作为他们， illing 时间增加，在 nanocomposite 的铜粒子尺寸减少，然后， nanocomposite 的 thethermoexpansivity 增加。当 milling 时间直到 100 h 时， nanocomposite 具有最好的 thermoexpansivity。在 35-45 deg C， nanocomposite 显示出好 thermosensitivity。
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