Highly fast and selective removal of nitrate in groundwater by bimetallic catalysts supported by fly ash-derived zeolite Na-X,Environmental Science: Nano

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Highly fast and selective removal of nitrate in groundwater by bimetallic catalysts supported by fly ash-derived zeolite Na-X
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-31 , DOI: 10.1039/d0en00721h
Jaehyeong Park _{1,

2,

3,

4,

5} , Jong Kwon Choe _{4,

5,

6,

7} , Woojin Lee _{1,

8,

9,

10} , Sungjun Bae _{1,

2,

3,

4}

Affiliation

A novel and sustainable Pd–Sn bimetallic catalyst supported by fly ash-derived zeolite Na-X (Zeolite-XF) was developed for highly reactive and N₂-selective reduction of nitrate in water. The surface characteristics of Zeolite-XF and Pd–Sn/Zeolite-XF were identified via various surface analyses, which showed formation of zeolite Na-X crystals with high purity and uniform dispersion of Pd and Sn nanoparticles on the surfaces of Pd–Sn/Zeolite-XF. Pd–Sn/Zeolite-XF showed a 43.1 × 10⁻³ s⁻¹ turnover frequency (TOF) with almost 90% N₂ selectivity under optimal conditions, which is 4–92 times higher than those of previously reported Pd based bimetallic catalysts. The great catalytic activity was elucidated by XPS and H₂-pulse chemisorption analysis, demonstrating that Zeolite-XF enhanced metal dispersion and increased the active metallic sites of Pd and Sn nanoparticles. Furthermore, the optimized Pd–Sn/Zeolite-XF catalyst was tested for reduction of nitrate in real groundwater, which showed the complete removal with 94% N₂ selectivity. The experimental results obtained from this study can provide a new insight that discarded solid waste can be converted to value-added environmental materials for synthesis of highly active catalysts, which surpass other freshly synthesized and commercially produced materials.

中文翻译：

粉煤灰衍生的Na-X沸石负载双金属催化剂可快速，选择性地去除地下水中的硝酸盐

开发了一种新型且可持续的，由粉煤灰衍生的Na-X沸石（Zeolite-XF）支撑的Pd-Sn双金属催化剂，用于高反应性和N ₂选择性还原水中的硝酸盐。通过各种表面分析鉴定了沸石-XF和Pd-Sn /沸石-XF的表面特性，这些结果表明形成了Na-X沸石晶体，纯度高，并且Pd-Sn /沸石-XF。Pd-Sn / Zeolite-XF的翻转频率（TOF）为43.1×10 ^-3 s ^-1，其中N ₂几乎为90％在最佳条件下的选择性比以前报道的基于Pd的双金属催化剂高4–92倍。XPS和H ₂脉冲化学吸附分析阐明了其巨大的催化活性，表明Zeolite-XF增强了金属分散性并增加了Pd和Sn纳米粒子的活性金属位点。此外，对优化的Pd-Sn / Zeolite-XF催化剂进行了测试，以减少实际地下水中的硝酸盐还原，结果表明完全去除具有94％的N ₂选择性。从这项研究中获得的实验结果可以提供新的见解，即可以将废弃的固体废物转化为高附加值的环境材料，以合成高活性催化剂，这超过了其他新鲜合成和商业生产的材料。

更新日期：2020-11-03

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