Nitrate contamination has been increasing all over the world due to anthropogenic activities. It has been still a serious environmental problem due to its harmful influence on human health. Nitrate removals by conventional ion exchange and microbial heterotrophic denitrification processes have diverse defects such as regeneration and disposal. Catalytic nitrate reduction using a bimetallic catalyst has been recently introduced as an effective technique reducing nitrate to non-toxic nitrogen gas. Selecting a proper support has been a significantly critical step to develop an economical, stable, reactive, and selective catalyst. Kaolinite is a naturally abundant clay mineral with high and strong metal intake capacity along with exceptional mechanical and chemical stability. These properties make kaolinite a suitable support for the bimetallic catalysis of nitrate. This study presents the development of a selective/reactive green bimetallic catalyst supported by kaolinite through an optimization of bimetals and operation factors. The Sn-Pd bimetal pair showed the highest nitrate removal (100%) and nitrogen selectivity (&gt; ~85%) with fast reduction kinetics (k = 11.0 × 10<sup>-2 </sup>× min<sup>-1</sup>). The results show that kaolinite supported Sn-Pd bimetallic catalyst can provide a green sustainable solution for the proper treatment of persistent nitrate contamination.

Bimetallic catalysis of nitrate on the Surface of Sn-Pd supported by kaolinite

256th National Meeting (2018)

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