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27 results on '"Guo, Zhi-Yan"'

7. Tuning FeO covalency boosts catalytic ozonation over spinel oxide for chemical industrial wastewater decontamination.

Author

Cao, Xu, Wang, Zhao‐Hua, Guo, Zhi‐Yan, Yang, Si‐Yu, Wu, Gang, Hu, Jun, Li, Wen‐Wei, and Liu, Xian‐Wei

Subjects
CHEMICAL systems, WATER purification, ACTIVATION energy, METALLIC oxides, OZONE
Abstract

Heterogeneous catalytic ozonation (HCO) emerges as a promising chemical industrial wastewater treatment solution, offering enhanced ozone utilization and reduced secondary pollutants. However, challenges in scaling HCO arise from a limited understanding of the catalytic mechanisms of metal oxides, particularly in generating active ozone sites. Here, we demonstrated the improvement of catalytic ozonation efficiency by enhancing the covalent bonding between FeO in Fe/Co spinel oxides. This alteration exploits the stronger electron‐donating capacity of Fe (II), enhancing FeOM bonds and electron enrichment at iron sites, leading to a significant reduction in the activation energy for ozone. Pilot experiments demonstrated a 75.3% COD removal efficiency and a threefold increase in ozone utilization efficiency compared to pure ozone system for chemical industrial wastewater treatment. This study not only advances our understanding of spinel oxides in ozone catalysis but also opens new avenues for practical HCO applications in water treatment. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Reusing Sulfur-Poisoned Palladium Waste as a Highly Active, Nonradical Fenton-like Catalyst for Selective Degradation of Phenolic Pollutants

Author

Si, Yang, Guo, Zhi-Yan, Meng, Yan, Li, Hui-Hui, Chen, Lin, Zhang, Ai-Yong, Gu, Chao-Hai, Li, Wen-Wei, and Yu, Han-Qing

Abstract

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 PdxSymaterials 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.

Published
2022
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20. Mn−O Covalency Governs the Intrinsic Activity of Co‐Mn Spinel Oxides for Boosted Peroxymonosulfate Activation.

Author

Guo, Zhi‐Yan, Li, Chen‐Xuan, Gao, Miao, Han, Xiao, Zhang, Ying‐Jie, Zhang, Wen‐Jun, and Li, Wen‐Wei

Subjects
*SPINEL, *METALLIC oxides, *OXIDES, *SPINEL group, *CHARGE exchange, *CHARGE transfer
Abstract

Transition metal (TM)‐based bimetallic spinel oxides can efficiently activate peroxymonosulfate (PMS) presumably attributed to enhanced electron transfer between TMs, but the existing model cannot fully explain the efficient TM redox cycling. Here, we discover a critical role of TM−O covalency in governing the intrinsic catalytic activity of Co3−xMnxO4 spinel oxides. Experimental and theoretical analysis reveals that the Co sites significantly raises the Mn valence and enlarges Mn−O covalency in octahedral configuration, thereby lowering the charge transfer energy to favor MnOh–PMS interaction. With appropriate MnIV/MnIII ratio to balance PMS adsorption and MnIV reduction, the Co1.1Mn1.9O4 exhibits remarkable catalytic activities for PMS activation and pollutant degradation, outperforming all the reported TM spinel oxides. The improved understandings on the origins of spinel oxides activity for PMS activation may inspire the development of more active and robust metal oxide catalysts. [ABSTRACT FROM AUTHOR]

Published
2021
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21. The Design of Wireless Control System for Dry Ice Cleaning Device

Author

Rong-pu Zhao, Ling Qiu, Guo-zhi Yan, Gao Chao, Chang-bin Hu, Wei Dong, and Xin Chen

Subjects
Engineering, business.industry, Pipeline (computing), Electromagnetic compatibility, GeneralLiterature_MISCELLANEOUS, Line (electrical engineering), Automotive engineering, Electromagnetic interference, Microcontroller, Control system, Dry ice, Electronic engineering, Wireless, business, Physics::Atmospheric and Oceanic Physics
Abstract

With a dry Ice cleaning device, a control system is designed based on micro controller module, applying to charged dry ice cleaning operation of exterior insulation in power substation. Micro controller module and wireless communication module is the core of control system. One pipe line upward introduces branch, instead of the traditional 8 pipe lines. It optimizes the pipeline design and reduce the complexity of the device. Electromagnetic compatibility and field operation test were carried out for wireless control system of dry ice cleaning device. The results show that the control system can meet the requirements of electromagnetic compatibility and electromagnetic interference, and meet the requirements of the field operation function and insulation.

Published
2017

27. Innentitelbild: Mn−O Covalency Governs the Intrinsic Activity of Co‐Mn Spinel Oxides for Boosted Peroxymonosulfate Activation (Angew. Chem. 1/2021).

Author

Guo, Zhi‐Yan, Li, Chen‐Xuan, Gao, Miao, Han, Xiao, Zhang, Ying‐Jie, Zhang, Wen‐Jun, and Li, Wen‐Wei

Subjects
*SPINEL, *OXIDES, *LAMINATED metals, *SPINEL group, *OCTAHEDRA
Abstract

Innentitelbild: Mn-O Covalency Governs the Intrinsic Activity of Co-Mn Spinel Oxides for Boosted Peroxymonosulfate Activation (Angew. Keywords: bimetal; covalency; octahedron; peroxymonosulfate (PMS); spinel oxides EN bimetal covalency octahedron peroxymonosulfate (PMS) spinel oxides 2 2 1 12/24/20 20210104 NES 210104 B Bimetallische Spinelloxide b sind effiziente Katalysatoren für die Aktivierung von Peroxymonosulfat (PMS), der katalytische Mechanismus ist jedoch unklar. Co verstärkt die Mn-O-Kovalenz in der oktaedrischen Konfiguration von Co SB 3-x sb Mn SB x sb O SB 4 sb , was die Ladungstransferenergie der Mn SB Oh sb -PMS-Wechselwirkung senkt und die Mn SP VI sp /Mn SP III sp -Redoxzyklen drastisch beschleunigt. [Extracted from the article]

Published
2021
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