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Iron chlorophyll-a as biomimic catalyst for the green synthesis of polyaniline nanostructures: Evaluation, characterization and optimization.
Sustainable Chemistry and Pharmacy ( IF 6 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.scp.2019.100194
Jimmy J. Daka , Onesimus. M Munyati , James Nyirenda

In this paper reported is the method of producing polyaniline (PANI) in a green and sustainable way. This work follows the attempt to find an environmentally benign way of synthesizing PANI. The green innovation has been using the enzyme horseradish peroxidase, Laccase and hemoglobin, but being enzymes they lose the catalytic activities in the region where best conducting PANI is formed. To overcome the limitation of the biocatalyst, the synthetic biomimic catalysts have been reported. The synthetic biomimic catalysts have involved the creation of tetra pyrrole porphyrin and chelated with metals and evaluated for their catalytic activities for the synthesis of PANI. Yet nature synthesizes the porphyrins in the clean, green and sustainable way, it was from this background that this research was done in modifying the chlorophyll-a porphyrin by chelating it with iron (III) and catalytic activities be evaluated.

The synthesis of PANI was done in 1.0 M hydrochloric acid, 0.2 M sodium lauryl sulfate was used as a surfactant, and activated with hydrogen peroxide 0.1 M. The polymerization process was monitored for in-situ absorbance at 650 nm wavelength and time course graph generated. The time of entering a steady state showed dependence on the concentration of iron-chlorophyll-a biomimic catalyst used.

The PANI formed was characterized with UV–Visible and FT-IR spectroscopy for optical properties, the peaks at 320 nm, 420 nm and 780 nm in UV–visible showing π-π* transitions and polaron transitions. The characteristic peaks too for IR were observed.

The morphological evaluation of the PANI by atomic force microscope showed uniformly distributed elliptical shaped polymer. The electrical characteristic showed the PANI was conducting and conductivity of 0.142 S/cm was recorded.

Polyaniline could indeed be synthesized when chlorophyll-a porphyrin chelated with iron (III) is used as a biomimic catalyst, the optimal concentration of 1.2 mM established, the initiator/monomer ratio needed to 2.5 for maximum PANI yield of 89.0%.



中文翻译:

叶绿素-a铁作为绿色合成聚苯胺纳米结构的仿生催化剂:评估,表征和优化。

本文报道了以绿色和可持续的方式生产聚苯胺(PANI)的方法。这项工作是在尝试寻找一种环保的合成PANI的方法之后。绿色创新一直在使用辣根过氧化物酶,漆酶和血红蛋白,但作为酶,它们会在形成最佳导电PANI的区域失去催化活性。为了克服生物催化剂的局限性,已经报道了合成的仿生物催化剂。合成的仿生物催化剂涉及四吡咯卟啉的生成并与金属螯合,并评估了其对PANI合成的催化活性。但是大自然以清洁,绿色和可持续的方式合成了卟啉,

PANI的合成在1.0 M盐酸中进行,0.2 M月桂基硫酸钠用作表面活性剂,并用0.1 M过氧化氢活化。监控聚合过程中650 nm波长的原位吸光度并生成时间过程图。进入稳态的时间显示出依赖于所使用的仿生催化剂铁-叶绿素的浓度。

形成的PANI用紫外可见光谱和FT-IR光谱进行了光学性质表征,紫外可见光中320 nm,420 nm和780 nm处的峰显示出π-π*跃迁和极化子跃迁。也观察到IR的特征峰。

通过原子力显微镜对PANI的形态评价显示出均匀分布的椭圆形聚合物。电学性能表明PANI导电,记录的电导率为0.142 S / cm。

当使用铁(III)螯合的叶绿素-a卟啉作为仿生催化剂时,确实可以合成聚苯胺,确定最佳浓度为1.2 mM,引发剂/单体比率必须达到2.5才能使PANI的最大产率达到89.0%。

更新日期:2019-12-03
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