Reusing Sulfur-Poisoned Palladium Waste as a Highly Active, Nonradical Fenton-like Catalyst for Selective Degradation of Phenolic Pollutants

作者：Si, Yang; Guo, Zhi-Yan; Meng, Yan; Li, Hui-Hui; Chen, Lin; Zhang, Ai-Yong^*; Gu, Chao-Hai; Li, Wen-Wei^*; Yu, Han-Qing

来源：Environmental Science and Technology, 2022, 56(1): 564-574.

DOI：10.1021/acs.est.1c05048

• palladium
• sulfur-poisoning
• Fenton-like reaction
• peroxymonosulfate
• non-radical pathway

Recycling of deactivated palladium (Pd)-based catalysts can not only lower the economic cost of their industrial use but also save the cost for waste disposal. Considering that the sulfur-poisoned Pd (PdxSy) with a strong Pd-S bond is difficult to regenerate, here, we propose a direct reuse of such waste materials as an efficient catalyst for decontamination via Fenton-like processes. Among the PdxSy materials with different poisoning degrees, Pd4S stood out as the most active catalyst for peroxymonosulfate activation, exhibiting pollutant-degradation performance rivaling the Pd and Co2+ benchmarks. Moreover, the incorporated S atom was found to tune the surface electrostatic potentials and charge densities of the Pd active site, triggering a shift in catalytic pathway from surface-bound radicals to predominantly direct electron transfer pathway that favors a highly selective oxidation of phenols. The catalyst stability was also improved due to the formation of strong Pd-S bond that reduces corrosion. Our work paves a new way for upcycling of Pd-based industrial wastes and for guiding the development of advanced oxidation technologies toward higher sustainability.

• 单位
  中国科学院