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Green synthesis of polypyrrole-supported metal catalysts: application to nitrate removal in water

机译：聚吡咯负载金属催化剂的绿色合成：在水中硝酸盐去除中的应用

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摘要

Pt and Pt/Sn catalysts supported on polypyrrole (PPy) have been prepared using Ar plasma to reduce the metal precursors dispersed on the polymer. The PPy support was synthesized by chemical polymerization of pyrrole with FeCl3 center dot 6H(2)O, this leading to the conducting form of the polymer (conductimetric measurements). The Ar plasma treatment produced a partial reduction of platinum ions, anchored as platinum chloro-complexes to the PPy chain, into metallic platinum. A homogeneous distribution of Pt and Sn nanoparticles was observed by TEM. Activity of the PPy-supported catalysts was evaluated in the reduction of aqueous nitrate with H-2 at room temperature. Nitrate concentration in water below the maximum acceptable level of 50 mg L-1 was achieved with all catalysts. However, considering not only efficiency in nitrate reduction, but also minimized concentrations of undesired nitrite and ammonium, the monometallic Pt catalyst seems to be the most promising one.
机译：负载在聚吡咯（PPy）上的Pt和Pt / Sn催化剂已经使用Ar等离子体制备，以减少分散在聚合物上的金属前体。 PPy载体是通过吡咯与FeCl3中心点6H（2）O的化学聚合合成的，这导致了聚合物的导电形式（电导测量）。 Ar等离子体处理将铂离子（作为铂氯络合物与PPy链锚定）部分还原为金属铂。通过TEM观察到Pt和Sn纳米颗粒的均匀分布。通过在室温下用H-2还原硝酸水溶液来评估PPy负载的催化剂的活性。使用所有催化剂，水中硝酸盐浓度均低于最大可接受水平50 mg L-1。然而，不仅考虑硝酸盐还原的效率，而且考虑到将不希望的亚硝酸盐和铵的浓度降至最低，单金属的Pt催化剂似乎是最有前途的催化剂。

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