Homogeneous Ni nanoparticles anchored on mesoporous N-doped carbon as highly efficient catalysts for Cr(VI), tetracycline and dyes reduction
Homogeneous Ni nanoparticles anchored on mesoporous N-doped carbon as highly efficient catalysts for Cr(VI), tetracycline and dyes reduction
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锚定在介孔 N 掺杂碳上的均质 Ni 纳米粒子作为 Cr(VI)、四环素和染料还原的高效催化剂
DOI：
10.1016/j.apsusc.2021.151748
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发表时间：
2021-10
影响因子：
6.7
通讯作者：
Xiangke Wang
中科院分区：
文献类型：
--
作者：
Zhimin Lv;Weiwei Chen;Yawen Cai;Kechang Chen;Kexin Li;Ming Fang;Xiaoli Tan;Xiangke Wang
近来环境污染引起了人们的极大关注。本研究通过热解Ni（II）吸附的共价三嗪骨架（CTF），在N掺杂的介孔碳（Ni@N-MCs）上制备了均匀分散的Ni纳米粒子，其对Cr（VI）、四环素和染料具有优异的催化还原能力。Ni@ N-MC 550（550 ℃热解）具有非常快的还原速率，可分别在2、1、5、7和1 min内还原Cr（VI）、甲基蓝、甲基橙子、刚果红和四环素。这主要是因为Ni纳米颗粒在CTF衍生的碳基质中的均匀分散增强了Ni@ N-MC 550的催化还原能力。此外，该催化剂具有良好的重复使用性和易分离的磁性。进一步的机理研究表明，Cr（VI）的还原是由于Ni@ N-MC 550催化分解HCOOH产生活性H·所致，而四环素和染料的还原则是由于Ni@ N-MC 550和NaBH 4的协同作用催化电子从BH 4-转移到它们身上所致。该工作不仅对碳纤维衍生的碳基体的可控合成具有一定的指导意义，而且对镍基催化剂催化还原有机和无机污染物进行了探索。
The environmental pollution has aroused great concern recently. In this study, a homogeneous dispersed Ni nanoparticles on N-doped mesoporous carbons (Ni@N-MCs) were obtained by pyrolyzing the Ni(II) adsorbed covalent triazine framework (CTF), which have outstanding catalytic reduction ability to Cr(VI), tetracycline and dyes. The as-fabricated Ni@N-MC550 (pyrolyzed at 550 ℃) shows a very rapid reduction rate, which can reduce Cr(VI), methyl blue, methyl orange, Congo red and tetracycline within 2, 1, 5, 7 and 1 min, respectively. This is mainly because the uniform dispersion of Ni nanoparticles in the CTF-derived carbon matrix enhances the catalytic reduction ability of Ni@N-MC550. In addition, the catalyst has good reusability and easy separation of magnetic properties. Further mechanism studies have demonstrated that the reduction of Cr(VI) is due to the active H· generated by the catalytic decomposition of HCOOH by Ni@N-MC550, while the reduction of tetracycline and dyes is due to the transfer of electrons from BH4-to them catalyzed by the synergistic effect of Ni@N-MC550 and NaBH4. This work not only has certain guiding significance for the controllable synthesis of carbon matrix derived from CTFs, but also explores the catalytic reduction of organic and inorganic pollutants by Ni-based catalysts.
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