KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 12
·3377-3388
·
IF 3.146
Sun Shuhan,Li Shiling,Hao Yibing,Yang Xiao,Dou Xiaomin
g/C 3 N 4 -ZnO composite catalysts were synthesized through surface hybridization of the delocalized conjugated- π structure of g/C 3 N 4 with the closely contacted surface of ZnO via a successive and simultaneous calcination procedure, and two kinds of photocatalysts, g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, were obtained. Heterojunctions were formed between the two components, which promote the separation of photogenerated carriers efficiently, and then enhanced the degradation of 100 mg/L of AMX The degradation rate of g/C 3 N 4 -ZnO1 was 1.54, 11.33, and 2.52-fold that of g/C 3 N 4 -ZnO2, g/C 3 N 4 and ZnO, respectively, at a 3.5-h reaction period, with the dosage of 0.3 g/L, and solution pH at 7.0±0.2. The recycle and reuse ability was excellent and 90.5% of AMX mitigation was achieved in the fifth cycle. For g/C 3 N 4 -ZnO1, electrons migrated from the conduction band of g/C 3 N 4 to that of ZnO via the heterojunction. ·OH and h + were the main active species for AMX degradation, compared to ·O
− 2
dominated for g/C 3 N 4 . Twelve intermediate products were identified, and two degradation pathways were inferred for g/C 3 N 4 -ZnO1 and g/C 3 N 4 -ZnO2, respectively. Finally, transformation products without lactam rings were achieved, which lost most of the antibacterial potencies, and the ecotoxicity was also dramatically decreased as indicated by the ECOSAR program.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Tingting Yu,Qingsong Liu,Guang Chen,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang
A novel heterostructure of g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 (ZB-3) was designed, and used in the microbial coupled photocatalytic fuel cell (MPFC). It can effectively improve electron utilization efficiency and pollutant degradation using this double Z-scheme heterojunction structure . The current–time ( I – t ) curves demonstrated that the current density of ZB-3 was higher than that of ZnO, ZnO/Bi 4 O 5 Br 2 (ZB-1), g-C 3 N 4 /ZnO (ZB-2). Electrochemical impedance spectroscopy (EIS) indicated ZB-3 possessed the minimum charge-transfer resistance. This MPFC for degrading rhodamine B (RhB) and tetracycline (TC) under different conditions were developed using these materials. Even in the dark condition, MPFC with g-C 3 N 4 /ZnO/Bi 4 O 5 Br 2 demonstrated 93% and 82% degradation efficiency for RhB and TC, respectively. Furthermore, the electron transport mechanism of the MPFC and ZB-3 were proposed. It paves the approach for more efficient pollutant degradation via MFC photocatalysis .
研究领域:
环境科学
·
能源材料
·
电化学
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光催化
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水处理技术
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DOI
高影响因子
DYES AND PIGMENTS
·
2026
·
IF 3.9
Zhiling Qiu,Ziyi Yan,Zhangjian Qian,Huimin Zhang,Yucheng Pan,Nan Jiang,Shangyun Wang,Li Na,Xin Xiao
A facile one-pot synthesis of g-C 3 N 4 /ZnO heterojunctions is reported for water remediation. The optimal composite (3:7 mass ratio) achieves enhanced visible-light degradation of methylene blue (k = 0.02033 min -1 ), attributed to interfacial charge separation rather than adsorption, as evidenced by PL and photocurrent measurements. Radical trapping and LC-MS identify •OH and h + as dominant species and reveal a stepwise demethylation degradation pathway. DFT calculations verify a type-II band alignment with a built-in electric field that thermodynamically drives carrier separation. The composite maintains excellent stability over multiple cycles, highlighting its potential for practical photocatalytic applications.
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产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·215
·
IF 4.034
Shengqiang Zhang,Changsheng Su,Hang Ren,Mengli Li,Longfeng Zhu,Shuang Ge,Min Wang,Zulei Zhang,Lei Li,Xuebo Cao
The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized by XRD, UV–VIS diffuse reflectance spectroscopy (DRS), N2adsorption-desorption, FTIR, TEM, and SEM. These nanocomposites’ photocatalytic properties were evaluated in methylene blue (MB) dye photodecomposition under UV and sunlight irradiation. Interestingly, compared with ZnO nanorods, g-C3N4/ZnO nanocomposites (x:1, obtained from urea and ZnO nanorods) exhibited weak photocatalytic activity likely due to a “shading effect”, while nanocomposites (x:1 CN, made from g-C3N4and zinc acetate) showed enhanced photocatalytic activity that can be ascribed to the effective establishment of heterojunctions. A kinetics study showed that a maximum reaction rate constant of 0.1862 min-1can be achieved under solar light illumination, which is two times higher than that of bare ZnO nanorods. The photocatalytic mechanism was revealed by determining reactive species through adding a series of scavengers. It suggested that reactive ●O2−and h+radicals played a major role in promoting dye photodegradation.Keywords:ZnO nanorods;dye photodegradation;graphitic carbon nitride;nanocomposites;in situ synthesis
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 2
·1-12
·
IF 2.9
Khatun Most Munera,Islam Ashraful,Yan Chunjie,Nesa Most Jinnatun
A nano-ZnO semiconductor material loaded with mineral attapulgite (ATP) photocatalyst has been investigated. Using ATP as a carrier, a variety of various mixtures of ZnO/ATP composites was synthesized. A scanning electron microscope (SEM), X-ray diffractometry (XRD), and UV-Vis spectrophotometer (UV-Vis) were used to examine the morphology, synergistic effects, and photocatalytic properties of ZnO/ATP nanocomposites. The target pollutant for photocatalytic degradation is methylene blue solution. When ATP is mixed with pure ZnO, the degrading performance of composite nanomaterials in methylene blue solution is considerably enhanced. The degree of methylene blue degradation increases as the amount of ATP in the composite grows, and the degradation rate of ZnO/40% ATP can reach 96% in 45 min under solar light illumination. The amount of ATP in the system is excessive, and the adsorption effect is visible. The optimal composite ratio was determined to be ZnO/30% ATP. After discovering the ideal composite ratio and synergy of ZnO/ATP, g-C 3 N 4 was compounded in the aforesaid system, dramatically increasing the composite’s photocatalytic activity. At 45 min, the degradation rate of methylene blue reaches 97%. The absorption range and intensity of ternary composites increased, and the photogenerated electron-hole recombination rate decreases significantly. The reaction rate constant increases from 0.033 to 0.069 min −1 . SEM revealed rod-like attapulgite particles packed with tiny zinc oxide particles and a moderate layered structure of C 3 N 4 . The XRD pattern indicated that C 3 N 4 ’s crystallinity is poor and ZnO’s peak intensity is excessively high, masking the composite material’s distinctive peaks. The degradation rate of g-C 3 N 4 /ZnO/30% ATP to methylene blue was found to be 91.5% after 5 cycles.
研究领域:
材料科学
·
环境科学
·
纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dingzhou Xiang,Shiqi Zhang,Guanghui Cheng,Lu Li,Xing Wang,Chenghuan Zhong,Shan Gao
Direct photocatalytic methane conversion into high-value liquid oxygenates has garnered significant research interest under mild conditions, yet a critical challenge is to obtain an excellent formaldehyde yield rate and selectivity only using H 2 O as the oxidant. Herein, a 2D g-C 3 N 4 nanosheet/ 0D ZnO quantum dots (ZCN) Z -scheme heterojunction was established by the self-assembly strategy to acquire an outstanding C1 liquid oxygenates (methanol and formaldehyde) with productivity of 908.13 μmol g cat −1 h −1 under ambient temperature and pressure without extra oxidant. Notably, the HCHO yield rate could be reached to 706.32 μmol g cat −1 h −1 with a selectivity of 69 %. The confinement effect of ZnO quantum dots (ZnO QDs) broadens the bandgap to some extent, making the catalyst possess a strong oxidation potential that could oxidize H 2 O to generate enough hydroxyl radical ( · OH) for activating CH 4 . Meanwhile, the ZCN Z -scheme heterostructure improves the migration and transport efficiency of photoexcitons but also enhances the activation and adsorption of CH 4. In situ experiments verify that the ZCN heterostructure accelerates the generation of methyl radical ( · CH 3 ) and · OH. This work paves a new way toward rationally constructing photocatalysts for CH 4 conversion into desirable chemical products under ambient conditions.
研究领域:
光催化
·
材料科学
·
化学工程
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）