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Conjugated polymers templated carbonization to design N, S co-doped finely tunable carbon for enhanced synergistic catalysis
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2021-09-17 , DOI: 10.1016/j.apcatb.2021.120732
Abdellah Ait El Fakir 1, 2 , Zakaria Anfar 1, 2, 3 , Mohamed Enneiymy 2, 3 , Amane Jada 2, 3 , Noureddine El Alem 1
Affiliation  

Efficient generation of 1O2 nonradical species from persulfate (PS) is demonstrated during heterogeneous catalysis systems based on the use of new Nitrogen and Sulfur doped carbons (NC, SC and NSC), as prepared by direct carbonization of polyaniline/polythiophene conjugated polymers at 800 °C. Complete organic molecules degradations were achieved with high mineralization rate (∼70%) for all systems, over a wide pH range (2.6∼9.5) in the presence of PS. Interestingly, the synergistic effect occurring between the N-Graphitic and the S-Thiophenic sites, modulates the surface electron density toward basic carbon structure (N∼4.76 at% and S∼3.87 at%, with SBET∼251 m2 g−1), leads to increases of the adsorption abilities and the reaction rate constant (from 0.076 to 0.338 min−1), and boosts the carbocatalyst' stability. Our discovery sheds new light on new systems promoting the Fenton-like oxidation process by 1O2 nonradical species, it may be a long-lasting sustainable environmentally strategy for water remediation.



中文翻译:

共轭聚合物模板化碳化以设计 N、S 共掺杂精细可调碳以增强协同催化

在基于使用新的氮和硫掺杂碳(NC、SC 和 NSC)的多相催化系统中,证明了从过硫酸盐 (PS)有效生成1 O 2非自由基物质,如通过聚苯胺/聚噻吩共轭聚合物在800℃。在 PS 存在下,所有系统在很宽的 pH 范围(2.6~9.5)内均以高矿化率(~70%)实现了有机分子的完全降解。有趣的是,N-Graphitic 和 S-Thiophenic 位点之间的协同效应将表面电子密度调节到基本碳结构(N∼4.76 at% 和 S∼3.87 at%,S BET ∼251 m 2 g -1),导致吸附能力和反应速率常数的增加(从 0.076 到 0.338 min -1),并提高了碳催化剂的稳定性。我们的发现为促进1 O 2非自由基物种的类芬顿氧化过程的新系统提供了新的思路,它可能是一种长期可持续的水修复环境策略。

更新日期:2021-09-29
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