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| Preparation of Multivalent Iron Heterogeneous Catalysts and Study on Treating Papermaking Wastewater |
| Received:October 27, 2025 Revised:November 24, 2025 |
| DOI：10.11980/j.issn.0254-508X.2026.05.014 |
| Key Words:Fenton sludge resource recycling multivalent iron heterogeneous catalysts papermaking wastewater high-temperature sintering |
| Fund Project:国家自然科学基金（31700510）；广西清洁化制浆造纸与污染控制重点实验室项目（2021KF16）。 |
| Author Name | Affiliation | Postcode | | LIU Yukai* | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LUO Qing* | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | XUE Wei | 2China Haicheng Engineering Technology Co., Ltd., Shanghai, 200031 | 200031 | | DUAN Chao | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | WANG Xu | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | CHENG Xiaolong | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LIU Mengyang | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LIU Yuxin | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | JIANG Shuaifei | 1College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science Technology, Xi’an, Shaanxi Province, 710021 | 710021 |
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| Abstract:In this study， Fenton sludge and graphite powder were used as raw materials to synthesize multivalent iron heterogeneous catalysts through high-temperature sintering at different temperatures. The results showed that when the sintering temperature was 500 ℃， the Fenton sludge was primarily reduced to Fe3O4， at 700 ℃， a significant amount of Fe3C was generated， and at 900 ℃， multivalent iron complexes consisting of Fe₃C and zero-valent iron (ZVI) was formed. The catalyst prepared at 900 ℃ exhibited the largest specific surface area and demonstrated the highest efficiency in degrading organic pollutants during the treatment of papermaking wastewater. Under the optimal conditions (pH value=2.5， mass ratio of COD and H2O2 was 1∶1.25， catalyst dosage=10 g/L， reaction time=90 min)， the CODCr removal rate reached 65.7%. Radical quenching experiments confirmed that ·OH serves as the key active species responsible for the degradation of organic pollutants. After 10 cycles， the relative activity retention rate was 89.2%， demonstrating excellent operational stability. The average deactivation rate per cycle was 1.2%， which was attributed to the blockage of catalyst pores and coverage of active sites， thereby inhibiting the generation of ·OH. |
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