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

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-02-25 DOI:10.1016/j.seppur.2025.132280

Qingcun Gu, Xiaoya Gao, Bingheng Liang, Xuhao Liu, Jiatian Wang, Teng Guo, Wenjie Zhu, Yongming Luo

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Abstract

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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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.