Molecular and kinetic insights to boron boosted Fenton-like activation of peroxymonosulfate for water decontamination

作者：Zhou, Peng; Yang, Yangyang; Ren, Wei; Li, Xiaojie; Zhang, Yongli; Lai, Bo^*; Wang, Shaobin; Duan, Xiaoguang^*

来源：Applied Catalysis B: Environmental , 2022, 319: 121916.

DOI：10.1016/j.apcatb.2022.121916

• Boron
• Peroxymonosulfate
• Fenton-like chemistry
• Fe(IV)
• Substrate-specific reactivity

In this work, crystalline boron is applied as a green co-catalyst to accelerate the redox processes in the Fe(III)/PMS(peroxymonosulfate) system. The semi-metallic B-B bonds in the icosahedra B-12 unit of boron will donate electrons to reduce Fe(III) to initiate Fenton-like PMS activation to generate hydroxyl radical (center dot OH), sulfate radical (SO4 center dot-) and high-valence Fe(IV). Meanwhile, surface boron can directly cleave the peroxide O-O bonds of PMS molecules to produce center dot OH. The contributions of radical and Fe(IV) can be regulated by Fe(III) dosage, and parallel radical and nonradical oxidation will enable non-selective degradation of diverse organic contaminants with high PMS utilization efficiency. Moreover, Fe(III) accelerates the self-clean of boron surface and secures continuous exposure of active sites. Spontaneously, boron experiences stepwise oxidation and hydrolysis into soluble products without generating toxins. The novel Boron/Fe(III)/PMS system overcomes the rate-limiting step in Fenton chemistry and realizes exceptional efficiency and stability in long-term operations.

• 单位
  四川大学; 南昌航空大学