APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Yingying Jiao,Yike Li,Jianshe Wang,Zhanhang He,Zhongjun Li
Photocatalyst with double Z-scheme mechanism can promote the separation and transmission of photo-induced carriers effectively. In this work, a novel C 3 N 4 nanotube (CNT)/N-doped carbon dots (NCDs)/Ni 2 P composite photocatalyst was prepared by decorating NCDs and Ni 2 P nanoparticles on CNT, respectively. A variety of test results, including photoluminescence spectra (PL), electrochemical impedance spectrum (EIS) and transient photocurrent responses (TPR), show that compared with CNT and CNT/Ni 2 P, CNT/NCDs/Ni 2 P composite can dramatically facilitate the separation and transmission of charge. Impressively, the CNT/NCDs/Ni 2 P composite achieves a hydrogen evolution rate of 627.2 µmol g -1 h −1 which is well above that of CNT and CNT/Ni 2 P, respectively (no detection and 48.5 μmol g -1 h −1 ). Combining the above characterization results with energy band calculation, we speculate that the remarkably optimized photocatalytic activity was predominantly ascribed to the double Z-scheme charge transfer mechanism for CNT/NCDs/Ni 2 P nanocomposite. This work provides a new member for family of photocatalysts with double Z-scheme mechanism, which is beneficial to further fundamental and applied research.
研究领域:
材料科学
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能源化学
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光催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Jiabao Gu,Chaogang Ban,Jiazhi Meng,Qianwen Li,Xuanyu Long,Xiaohan Zhou,Nan Liu,Zequan Li
Rapid recombination of the photogenerated carrier, a limited range of photoexcitation, and unsatisfactory photocatalytic activity are the limiting factors in photocatalytic applications. Accelerating photogenerated carrier transfer and constructing surface active sites have become critical tasks. In this study, a dual Z-scheme UNiMOF/BiVO 4 /S-C 3 N 4 (NBSCN) photocatalyst with a 2D/3D/2D structure was successfully constructed. Under visible-light irradiation, NBSCN outperforms single and binary composites in photocatalytic tetracycline photodegradation and Cr(VI) photoreduction due to the synergistic effect of adsorption and photocatalysis. The maximum photocatalytic efficiency of tetracycline (90.1 %) and Cr(VI) (93.6 %) in 120 min was achieved by NBSCN-20 %. The exceptional photocatalytic activity of NBSCN-20 % can be attributed to the large specific surface area, increased active sites, improved visible-light absorption ranges, and the construction of heterojunctions. The fabricated dual Z-scheme heterojunction at the interface of NBSCN reduces the recombination rate of photogenerated carriers and widens the range of light absorption. NBSCN-20 % exhibits excellent stability in the process of cyclic experiments. On the basis of the results, the feasibility of the dual Z-scheme mechanism is proposed. This work demonstrates that NBSCN-20 % photocatalyst has promising application prospects in removing heavy-metal ions and organic pollutants from aqueous environments.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Ting Liang,Jingwen Wei,Shiming Zhang,Jinhang Yang,Jiangli Sun,Zuji Li,Zhihong Li,Zebin Yu,Shuangfei Wang,Yanping Hou
Design of photocatalysts with high-efficiency for sunlight utilization is one of the prerequisites for CO 2 photoreduction . Besides, modulating a stable electron-donating environment to meet the energy barrier for CO 2 reduction to CO is crucial. In this work, the ZnSe/Ag 2 Se/AgBr (ZAA) heterojunction was fabricated by growing the ZnSe on the AgBr surface accompanied by in-situ generation of Ag 2 Se between the two components by hydrothermal process. Results showed that the ZAA exhibited excellent light response ability over the full wavelength range. X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) demonstrated that the charge transfer of the ZAA conformed to dual Z-scheme mechanism, with the Ag 2 Se acting as an electron transfer bridge, which in turn acted as an electron reservoir to accelerate electron transfer, facilitating carriers’ separation. The highest CO yield of 54.14 µmol/g/h was obtained from the optimal ZAA-2, which was 11.76 and 10.44 times of pure ZnSe and Ag 2 Se, respectively. This work demonstrated the feasibility of a dual Z-scheme heterostructure with full spectrum response for offering stable electron-donating environment and improving electron transfer for enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Environmental Science and Ecotechnology
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2023
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IF 12.6
Jing-Yan Zhang,Jie Ding,Lu-Ming Liu,Rui Wu,Lan Ding,Jun-Qiu Jiang,Ji-Wei Pang,Yan Li,Nan-Qi Ren,Shan-Shan Yang
Sulfamethoxazole (SMX) is a significant environmental concern due to its adverse effects and ecological risks. SMX elimination in aquatic environments via photocatalysis presents a viable solution, given its high oxidation potential. However, such a solution remains controversial, primarily due to a lack of selectivity. Here we introduce a molecularly imprinted TiO 2 @Fe 2 O 3 @g-C 3 N 4 (MFTC) photocatalyst designed for the selective degradation of SMX. To assess MFTC's selectivity, we applied it to degrade synthetic wastewater containing SMX alongside interfering species sulfadiazine (SDZ), ibuprofen (IBU), and bisphenol A (BPA). The results demonstrated a selective degradation efficiency rate of 96.8%, nearly twice that of competing pollutants. The molecularly imprinted sites within the catalyst played a crucial role by selectively capturing SMX and enhancing its adsorption, thereby improving catalytic efficiency. The degradation process involved •OH and •O 2 − free radicals, with a newly proposed double Z-scheme mechanism and potential pathway for SMX degradation by the MFTC photocatalytic system. This study enriches the application of photocatalysis using molecularly imprinted nanocomposite materials for treating complex pollutant mixtures in water.
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
PubMed
高影响因子
LANGMUIR
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2025
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IF 3.9
Shuo Yang,Kaiyue Li,Wei Feng,Ping Huang,Keyan Liu,Yuquan Zhuo,Wenhui Li,Ziwen Yang,Donglai Han
As the widespread discharge of antibiotics, pesticides, and dyes exacerbates water pollution, the development of efficient photocatalytic materials has become crucial for addressing this challenge. In this study, a new paradigm of n-p-p ternary heterojunction photocatalyst composed of ZnO nanospindle, Ag2CO3, and Ag2O nanoparticles was synthesized via a hydrothermal and coprecipitation method followed by calcination. By adjusting the calcination time, the phase transition from Ag2CO3 to Ag2O was precisely controlled, leading to enhanced charge separation, transition, and improved light absorption properties. The prepared ZnO/Ag2CO3/Ag2O (Z/AC/A) photocatalyst exhibited outstanding photocatalytic performance for the degradation of typical water pollutants, including 2,4-dichlorophenol (2,4-D), tetracycline (TC), and malachite green (MG) under simulated sunlight irradiation. And the photocatalytic efficiencies reached 90.8, 94.8, and 97.4%, respectively, with the ZnO/Ag2CO3/Ag2O photocatalyst, which was calcined at 195 °C for 12 min, abbreviated as Z/AC/A-3, demonstrating the highest activity. Radical scavenging experiments and electron spin resonance (ESR) tests revealed that superoxide radicals (•O2–) serve as the dominant active species, while holes (h+) and hydroxyl radicals (•OH) play secondary roles in the photocatalytic process. Additionally, the photocatalytic degradation mechanism was confirmed to follow a dual Z-scheme charge transfer pathway, which effectively enhanced the charge separation and photocatalytic performance. The photocatalyst also exhibited excellent structural stability and reusability over five consecutive cycles. These results suggest that the Z/AC/A n-p-p ternary heterojunction holds promising potential for practical photocatalytic applications in environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22297-22311
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IF 2.22
Guan Yiyin,Liu Wenjie,Zuo Shixiang,Yuan Kun,Wu Fengqin,Ji Jinjin,Yao Chao
In this paper, rutile phase titanium oxide/Sb-SnO 2 /anatase phase titanium oxide (TiO 2 (R)/C-TiO 2 (A)) heterostructured nanocomposites were prepared by a sol–gel method and a hydrothermal method. By optimizing the mass ratio between TiO 2 (R) and C-TiO 2 (A), the rod-ball heterostructures of TiO 2 (R)/C-TiO 2 (A) were formed and exhibited enhanced simulated sunlight-driven photocatalytic desulfurization performance. According to the results, the desulfurization rate of TiO 2 (R)/C-TiO 2 (A) was 93.98% after 60 min, which is higher than C-TiO 2 (A) and TiO 2 (R)/TiO 2 (A). In addition, the photocatalytic recyclability test indicated that after three times the reuse of TiO 2 (R)/C-TiO 2 (A) could still reach 85.98%. The enhanced photocatalytic performance could be attributed to the double Z-scheme heterojunction in the TiO 2 (R)/C-TiO 2 (A) and the uniformly structure of rod array, which resulted in the higher separation efficiency of electrons and holes. Furthermore, the results of photocatalytic active radical species trapping experiments showed that the main substances in the photocatalytic reaction are ∙O 2 − and h + . This paper also established the double Z-scheme heterojunction reaction mechanism.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xufei Li,Ting Chen,Yanling Qiu,Zhiliang Zhu,Hua Zhang,Daqiang Yin
The coupling of photocatalysis and peroxymonosulfate (PMS) activation is considered as a promising strategy for the removal of organic pollutants. However, the development of visible-light-excited efficient photocatalysts for PMS activation remains challenging. Herein, a new recyclable dual Z-scheme g-C 3 N 4 /BiVO 4 /CuFe 2 O 4 (CN/BVO/CFO) heterojunction was first fabricated employing a simple hydrothermal approach. The results showed that the photocatalytic degradation behavior of levofloxacin (LEV) by CN/BVO/CFO under visible light illumination was enhanced compared with single BVO, CN, CFO and binary CN/BVO. Moreover, after adding PMS, the removal efficiency of LEV over CN/BVO/CFO/Vis/PMS system reached 96.2% within 60 min, which was 3.5 and 4.3 times higher than that of CN/BVO/CFO/Vis and CN/BVO/CFO/PMS, respectively. Characterization test and mechanism analysis indicated that the improved catalytic activity resulted from the dual Z-scheme heterostructure and the synergistic effect between photocatalysis and PMS activation, making the production of multiple active species. Additionally, CN/BVO/CFO/Vis/PMS system exhibited supreme mineralization ability, low degradation product toxicity and acceptable adaptability to solution pH, coexisting anions and organics. More importantly, the favorable magnetic separation and stability would provide convenience for the potential practical application of CN/BVO/CFO. This research may give a perspective on the design of efficient dual Z-scheme photocatalyst for PMS activation in environmental remediation.
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
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