Overlooked role of transition metal impurities (cobalt and nickel) substitution in tuning pyrite to activate peroxymonosulfate for degradation of emerging pollutants

被引：1
作者：
Gu, Qingcun [1 ,2 ,3 ,4 ]
Gao, Xiaoya [1 ,2 ,3 ,4 ]
Liang, Bingheng [1 ,2 ,3 ,4 ]
Liu, Xuhao [1 ,2 ,3 ,4 ]
Wang, Jiatian [1 ,2 ,3 ,4 ]
Guo, Teng [1 ,2 ,3 ,4 ]
Zhu, Wenjie [1 ,2 ,3 ,4 ]
Luo, Yongming [1 ,2 ,3 ,4 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Environm Sci & Engn, Kunming 650500, Peoples R China
[2] Innovat Team Volatile Organ Cpds Pollutants Contro, Kunming 650500, Peoples R China
[3] Higher Educ Key Lab Odorous Volatile Organ Cpds Po, Kunming 650500, Peoples R China
[4] Key Lab Yunnan Prov Synthesizing Sulfur containing, Kunming 650500, Peoples R China
来源：
SEPARATION AND PURIFICATION TECHNOLOGY | 2025年 / 363卷
基金：
中国国家自然科学基金;
关键词：
Pyrite; Impurity substitution; Peroxymonosulfate; Reactive oxygen species; Degradation; OXIDATION-KINETICS; EFFICIENT; NANOSHEETS; NI; CO;
D O I：
10.1016/j.seppur.2025.132280
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Impurities play a crucial role in various catalytic systems. This study firstly investigated the effects of Ni and Co impurities in pyrite on peroxymonosulfate (PMS) activation to degrade emerging pollutants. The substitution of 6.30 % Ni and 5.64 % Co enhanced the catalytic activity of pyrite, with rate constants of 12 and 22 times greater than pure pyrite, respectively. Theoretical calculations revealed that impurities shifted PMS adsorption to a dual- site mode, leading to stronger adsorption energy and more electron transfer numbers than pure pyrite. The extension of oxygen-oxygen bond in PMS significantly promoted its cleavage to generate reactive oxygen species (particularly singlet oxygen of 74 times greater in 5.64 % Co-Py/PMS than that in the Py/PMS), which ensured the enhanced environment stability/adaptability and reduced pollutants toxicity within the 6.30 % Ni-Py and 5.64 % Co-Py systems. This study provides new insights into positively governing pyrite-based PMS advanced oxidation processes from the perspective of coexisting impurities.
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页数：13
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