Combustion synthesis of high-entropy carbide nanoparticles for tetracycline degradation via persulfate activation

作者：Chu, Yanhui^*; Yu, Renwang; He, Gang^*; Zhang, Ting; Dong, Heng^*; Deng, Shuxiang; Li, Jiangtao

来源：Science China-Materials, 2022, 65(11): 3144-3149.

DOI：10.1007/s40843-022-2080-5

• high-entropy carbides
• nanoparticles
• combustion synthesis
• persulfate activation
• oxidation catalyst

The development of high-entropy carbide nanoparticles merits untold scientific and technological potential, yet their synthesis remains a challenge using conventional synthetic techniques. Herein we present a facile, rapid and low-cost route for the combustion synthesis of (Ta0.25Nb0.25-Zr0.25Ti0.25)C high-entropy carbide (HEC-1) nanoparticles by self-propagating reaction of metal oxides, carbon and Mg mixture precursors in NaF salt media for the first time. The combustion synthesis possibility of HEC-1 is first analyzed theoretically from thermodynamic aspects, and then the ultrafine HEC-1 nanoparticles (average particle size: similar to 19 nm) are synthesized successfully by the combustion synthesis technique at combustion temperature of similar to 1487 K, duration of 63 s, and heating rate of similar to 68 K s(-1). The as-synthesized HEC-1 nanoparticles possess high compositional uniformity and low oxygen impurity content of 2.98 wt%. To prove their utility, the as-synthesized HEC-1 nanoparticles are utilized as an effective persulfate activation catalyst for the degradation of tetracycline pollutant in groundwater or wastewater and a removal efficiency of similar to 65.5% for tetracycline is obtained after 10 h.

• 单位
  南开大学