INORGANIC CHEMISTRY
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2025
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IF 4.7
Xueli Mei,Xueyang Zhao,Hongtao Xie,Nemanja Gavrilov,Qin Geng,Qin Li,Huawei Zhuo,Yali Cao,Yizhao Li,Fan Dong
The electrocatalytic two-electron oxygen reduction reaction (2e-ORR) represents one of the most prospective avenues for the in situ synthesis of hydrogen peroxide (H2O2). However, the four-electron competition reaction constrains the efficiency of H2O2 synthesis. Therefore, there is an urgent need to develop superior catalysts to facilitate the H2O2 synthesis. In this study, graphite-phase carbon nitride and cerium dioxide composites (g-C3N4/CeO2) with varying CeO2 loadings were prepared with favorable 2e-ORR electrocatalysts. The optimized composite, containing 20 wt % CeO2 (g-C3N4/CeO2-20%) exhibited the highest Faradaic efficiency (FE) of 97% and notable H2O2 yielding of 9.84 mol gcat.–1 h–1 at the potential of 0.3 V (vs RHE) in a 0.1 M KOH electrolyte. Density functional theory calculations revealed that the improvement of the selectivity and yield of H2O2 for the composites were attributed to the charge transfer between g-C3N4 and CeO2, which causes the active site C atom donating electrons to form C+, thereby enhancing the adsorption and desorption of *OOH intermediates. Additionally, the g-C3N4/CeO2-20% composite exhibits excellent 2e-ORR performance in neutral and acidic electrolytes and demonstrates superior capability in electro-Fenton degradation of organic pollutants. This study not only provides new insights into the electrocatalytic mechanism of g-C3N4/CeO2 composites but also demonstrates an effective method for designing 2e-ORR catalysts.
研究领域:
材料科学
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电化学
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环境科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
·
IF 7.2
Fanqi Yi,Wenbo Li,Ling Li,Zhanpeng Zhou,Rongdi Tang,Chunxia Ding,Yaocheng Deng,Daoxin Gong
Photocatalytic cooperation with peroxymonosulfate (PMS) is considered to be an advanced oxidation process for purifying wastewater. This research synthesized g-C 3 N 4 /CeO 2 (GC) heterojunction catalysts and achieved efficient PMS activation under visible light. This catalyst has a reasonable band structure and efficient charge transfer ability. The experimental results indicated that within 60 min, the degradation efficiency of nitenpyram (NTP) by the GC/PMS/Vis system could reach 85.5 % (pH = 6.68), and the reaction rate constant was 1.74 times and 1.96 times that of the g-C 3 N 4 /PMS/Vis and CeO 2 /PMS/Vis systems, respectively. Additionally, this research systematically demonstrated that the GC belongs to type-II heterojunction, and employed electron spin resonance (ESR) and quenching experiments to ascertain that the system is dominated by singlet oxygen ( 1 O 2 ), hole (h + ), and superoxide (•O ¯ 2 ). In the natural organic matter experiments and cyclic experiments, the system demonstrated excellent stability and anti-interference ability, with the degradation efficiency remaining above 80 %. These results furnish a novel perspective for the rational configuration of transition metal oxide/PMS/Vis systems and concurrently disclose new revelations regarding the degradation of neonicotinoid pesticides.
研究领域:
环境科学
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农药化学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
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2024
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IF 5.2
Jun Cai,Hua Wang,Hui Li,Kongzhai Li
Solar energy can be used to convert CO 2 into valuable chemical compounds. However, the low activity of photocatalysts has hindered their development. By using defective g-C 3 N 4 /CeO 2 heterojunctions, CO 2 was successfully photo-reduced with high performance under ambient water vapor conditions without adding additives. g-C 3 N 4 in this system has a significant impact on CO 2 conversion efficiency, with 5 wt% g-C 3 N 4 /CeO 2 exhibiting competitive performance, achieving 45.66 μmol/g CO in 6 h with nearly 100% selectivity. Photoactivity is attributed to the formation of g-C 3 N 4 /CeO 2 heterojunctions, which provide excellent electron transport and electron-hole separation. Additionally, light enhances the CO 2 adsorption capacity of the catalyst, thereby improving reaction properties. The photogenerated electrons generated under light excitation can quickly gather at the surface and defective parts of the sample, facilitating effective CO 2 adsorption and promoting the formation of *COOH, thus promoting the photoreduction process of CO 2 . Cycle tests also demonstrate long-term stability. Highly efficient charge separation and reduced free energy of CO 2 reduction both promote CO 2 conversion performance. This work can provide an important idea for designing CeO 2 -based CO 2 photocatalysts.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Dandan Wang,Jing Li,Rong Zhang,Beiyu Xin,Xueru Huang,Yang Wang,Jifeng Guo
Microcystis aeruginosa (M. aeruginosa) is a typical harmful algal associated with eutrophication, making the study of its inactivation critical for water restoration. In this research, g-C 3 N 4 /CeO 2 composites with S-scheme heterojunctions were synthesized and incorporated into sodium alginate (SA) to successfully prepare photocatalytic gel beads with floating capabilities. A photocatalytic persulfate (g-C 3 N 4 /CeO 2 /SA/Vis/PMS) system was developed to systematically investigate the algal inactivation efficacy of floating catalysts. The g-C 3 N 4 /CeO 2 S-scheme heterojunctions significantly enhanced algal inactivation efficiency, achieving up to 96.65 % inactivation within 80 min. The alterations in algal cell properties during the inactivation process were examined. A decrease in the content of algal bile proteins indicated a disruption of the photosynthetic system within the algal cells, while an increase in the concentrations of K + , Ca 2+ , and Mg 2+ suggested further disruption of algal cell membranes and walls. Additionally, three-dimensional fluorescence spectroscopy (EEM) results indicated that the extracellular organic matter produced during the rupture of algal cells was degraded into humic acid-like substances. The energy bands and electronic structure of g-C 3 N 4 /CeO 2 were calculated using density functional theory (DFT) to analyze the electron transfer mechanism involved in this process, which is consistent with the S-scheme electron transfer pathway. The effective inactivation of M. aeruginosa was successfully achieved through the combined action of the non-radical 1 O 2 ,·O 2 – , and h + generated during the photogenerated carrier transfer process. This approach offers a promising strategy for the management of algal blooms in eutrophic waters.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Xueding Jiang,Shufeng Lai,Weicheng Xu,Jianzhang Fang,Xin Chen,Jingzi Beiyuan,Xiwu Zhou,Kaichun Lin,Junxing Liu,Gongcou Guan
In this work, a novel visible-light-driven ternary BiOI/g-C 3 N 4 /CeO 2 photocatalyst was successfully synthesized by calcination and hydrothermal treatment . The obtained ternary BiOI/g-C 3 N 4 /CeO 2 had high photocatalytic performance for the degradation of tetracycline (TC) under visible-light irradiation. The samples were characterized by X-ray diffraction (XRD), UV–Vis diffuse reflectance (DRS) spectroscopy, and Fourier transform infrared spectroscopy (FT-IR), etc. The results indicated that 3 wt% BiOI/g-C 3 N 4 /CeO 2 catalyst possessed the best photocatalytic activity (91.6%) among all the as-prepared samples. The enhanced photocatalytic activity could be attributed to a double charge transfer process between g-C 3 N 4 and other catalysts in the ternary heterojunction , so that the separation of photogenerated electron–hole pairs was more effective. The as-prepared ternary sample also exhibited high stability after six cycles of the photodegradation reaction. Additionally, the active species (h + ) were considered as the main reactive species during the degradation of TC. Based on the research results, a possible photocatalytic reaction mechanism for the BiOI/g-C 3 N 4 /CeO 2 sample was proposed and discussed in detail.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
ChemCatChem
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2018
·Vol. 11
·期 3
·1069-1075
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IF 4.674
Rui Tong,Zhi Sun,Xiongwei Zhong,Xina Wang,Jincheng Xu,Ye Yang,Baomin Xu,Shuangpeng Wang,Hui Pan
Graphical Photocatalytic hydrogen production : g-C 3 N 4 /CeCO 3 OH/CeO 2 ternary composite showed greatly enhanced photocatalytic performance for hydrogen production under visible light irradiation. Promoting the separation of photo-generated carriers is significantly important to improve the efficiency of photocatalytic hydrogen production. Therefore, we prepared g-C 3 N 4 /CeCO 3 OH/CeO 2 (CeCeCN) ternary nanocomposite via an easy synthetic way using g-C 3 N 4 and CeO 2 as reactants. A CeCO 3 OH layer was formed and resulted in the novel ternary photocatalyst. The CeCeCN composite shows superior photocatalytic (PC) H 2 generation performance in sunlight excitation. The H 2 evolution rate is about 764 μmol h −1 g −1 , which is over 11 times larger than those of g-C 3 N 4 and CeO 2 . Compared with g-C 3 N 4 and CeO 2 , CeCeCN further shows a larger photo-response current density and a lower charge-transfer resistance. The remarkably increased photocatalytic property of CeCeCN is because of the efficient charge migration induced by the formed heterojunction. Our findings demonstrate that building multi-heterostructures can liberate more excited electrons for efficient hydrogen production under sunlight.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Materials
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2020
·Vol. 13
·期 17
·3811
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IF 3.057
Zhiquan Huang,Leicheng Li,Zhiping Li,Huan Li,Jiaqi Wu
Herein, novel ternary kaolin/CeO2/g-C3N4composite was prepared by sol-gel method followed by hydrothermal treatment. The self-assembled 3D “sandwich” structure consisting of kaolin, CeO2and g-C3N4nanosheets, was systematically characterized by appropriate techniques to assess its physicochemical properties. In the prerequisite of visible-light irradiation, the removal efficiency of ciprofloxacin (CIP) over the kaolin/CeO2/g-C3N4composite was about 90% within 150 min, 2-folds higher than those of pristine CeO2and g-C3N4. The enhanced photocatalytic activity was attributed to the improved photo-induced charge separation efficiency and the large specific surface area, which was determined by electrochemical measurements and N2physisorption methods, respectively. The synergistic effect between the kaolin and CeO2/g-C3N4heterostructure improved the photocatalytic performance of the final solid. The trapping and electron paramagnetic resonance (EPR) experiments demonstrated that the hole (h+) and superoxide radicals (•O2−) played an important role in the photocatalytic process. The photocatalytic mechanism for CIP degradation was also proposed based on experimental results. The obtained results revealed that the kaolin/CeO2/g-C3N4composite is a promising solid catalyst for environmental remediation.Keywords:kaolin;CeO2;g-C3N4;visible-light irradiation;photocatalytic degradation
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Ren Zongli,Zhao Zhongwei,Ma Xin,Zhang Weiwei
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation estrone and congo red. In this paper, g-C 3 N 4 is chosen as the main photocatalyst, CeO 2 nanosheet with the unique Ce 4+ → Ce 3+ conversion performance and Fe 3 O 4 -Reduced graphene oxide are loaded onto the g-C 3 N 4 surface to bulid 2D-2D magnetic photocatalyst. The 2D–2D magnetic photocatalyst structure imparts reusability by magnetic retrieval and at the same time Fe 3 O 4 -Reduced graphene oxide acts as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performance is examined using etsrone and congo red. Photodegradation studies show the CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide a composite catalyst can degrade 71% of estrone, 92% of congo red and 89% phenanthrene, Free radical scavenger test shows superoxide and hydroxyl radical species play a major role in the degradation. Furthermore, it is demonstrated that the magnetic CeO 2 /g-C 3 N 4 / Fe 3 O 4 -Reduced graphene oxide possesses strong antibacterial properties against Proteus mirabilis and Escherichia coli. A three-factor-three-level Box–Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), The quality of photocatalyst(mg) and pollution concentration(ppm) by response surface methodology. It is expected that CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide can be used as a 2D–2D magnetic photocatalyst for to achieve its valorization, which have very broad development prospects in the field of environmental remediation or catalysis. Graphical Abstract
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Baogui Ye,Zhongwei Zhao,Hongmei Liu
Construction of multi-interface contact step-scheme photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation Estrone and Congo red (CR). In this work, g-C 3 N 4 was selected as the main component, CeO 2 nanosheets with unique Ce 4+ →Ce 3+ conversion property and M-rGO were loaded on the surface of g-C 3 N 4 to construct magnetic photocatalyst, whose structure imparted reusability by magnetic retrieval and at the same time M-rGO acted as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performances were investigated with Estrone and CR, and the results showed that the composite photocatalyst g-C 3 N 4 /CeO 2 /M-rGO could degrade 71% of Estrone and 92% of CR. Free radical scavenger test showed that superoxide and hydroxyl radical species played a major role in the degradation. Furthermore, it was demonstrated that the magnetic photocatalyst g-C 3 N 4 /CeO 2 /M-rGO possessed strong antibacterial properties against Proteus mirabilis. A three-factor-three-level Box-Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), the mass of photocatalyst (mg) and pollution concentration (ppm) by responding surface methodology. It was expected that the g-C 3 N 4 /CeO 2 /M-rGO can be used as a magnetic photocatalyst to achieve its valorization, which has very broad development prospects in the field of environmental remediation or catalysis.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
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