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Your search keyword '"Pi, Zhoujie"' showing total 37 results
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37 results on '"Pi, Zhoujie"'

31. Corrigendum to “Peroxymonosulfate (PMS) activation by mackinawite for the degradation of organic pollutants: Underappreciated role of dissolved sulfur derivatives” [Sci. Total Environ. 811 (2022) 151421]

Author

Hou, Kunjie, primary, Pi, Zhoujie, additional, Chen, Fei, additional, He, Li, additional, Yao, Fubing, additional, Chen, Shengjie, additional, Li, Xiaoming, additional, Wang, Dongbo, additional, Dong, Haoran, additional, and Yang, Qi, additional

Published
2022
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33. Nonradical-dominated peroxydisulfate activation by nitrogen-rich hierarchical porous graphite carbon for efficient degradation of tetracycline.

Author

Pi, Zhoujie, Hou, Kunjie, Yao, Fubing, He, Li, Chen, Shengjie, Fu, Yukui, Li, Xiaoming, and Yang, Qi

Subjects
*TETRACYCLINE, *HYDROTHERMAL carbonization, *TETRACYCLINES, *GRAPHITE, *ADSORPTION capacity, *CARBON
Abstract

A nitrogen(N)-rich hierarchical porous graphite carbon (NHC) was synthesized at different hydrothermal carbonization temperature (400, 600 and 800 °C) using a template-free and solvent-free method. The as-prepared materials possessed perfect bifunctional performance for tetracycline (TC) removal via synergistic adsorption and catalytic activation of peroxydisulfate (PDS). The carbonization temperature had a significant effect in the material structure and property adjustment. The carbonaceous material prepared at 800 °C (NHC-800) showed optimal adsorption and catalytic activation of PDS efficiency with 451.62 mg/g maximum TC adsorption capacity and 69.5% TC mineralization rate within 180 min. The pseudo-first-order rate constant for NHC-800 (0.0406 min−1) was 111.54-folders higher than NHC-400 (3.6400 × 10−4 min−1). Moreover, the NHC-800/PDS system had a good anti-interference ability to pH, inorganic anions and humic acid. The investigation of catalytic mechanism revealed that the nonradical process governed PDS activation process with defective edges, C O, graphitic N and pyridinic N as the active redox sites, while the large surface area of NHC-800 or the activated C(+) supported the adsorption of pollutants or PDS , further facilitated the electron-transfer process. Finally, the possible degradation pathway was proposed and the acute toxicity of degradation intermediates was assessed. This study not only provides a facile route for the synthesis carbonaceous materials, but also gives a detailed insight in N species and other reactive sites of carbonaceous materials in adsorption and catalytic degradation process. [Display omitted] • Carbonization temperature had great effect on both adsorption and catalytic ability of material. • Only 0.05 g/L dosage of material showed over 90% removal rate of TC within 60 min. • The active redox sites of NHC-800 were the defective edges, C=O, graphitic N and pyridinic N. • Nonradical electron-transfer and 1O 2 pathways were dominant in NHC-800/PDS system. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Revisiting the contribution of FeIVO2+in Fe(II)/peroxydisulfate system

Author

Hou, Kunjie, Shen, Peng, Wang, Zhu, Pi, Zhoujie, Chen, Fei, Li, Xiaoming, Dong, Haoran, and Yang, Qi

Abstract

Recent studies have proposed that the high-valent iron species (such as FeIVO2+) rather than sulfate radical (SO4•−) and hydroxyl radical (•OH) are the main reactive oxidant species (ROS) in Fe(II)/peroxydisulfate (PDS) system with the methyl phenyl sulfoxide (PMSO) as the FeIVO2+probe. However, many operational factors may interfere with the accuracy of this method, so the contribution of FeIVO2+calculated by this method is controversial. In this study, the possible effect of Fe(II) concentration, pollutant type, reducing agent, or coexisted anions on FeIVO2+production and its corresponding contribution to the removal of target pollutants in the Fe(II)/PDS system were investigated in detail, and the intrinsic mechanisms involved were also explored. This study shows that ROS generation is a complex process in the Fe(II)/PDS system, and multiple combinatorial approaches are urgently required to deeply explore the contribution of ROS to the elimination of target contaminants.

Published
2023
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