JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jiayi Wang,Penggang Ren,Yanli Du,Xueyan Zhao,Zhengyan Chen,Lu Pei,Yanling Jin
Graphitic carbon nitride (g-C 3 N 4 ) is a promising photocatalyst with lots of merits, such as visible light driven (200–1000 nm), cost-effective and high stability. However, the single g-C 3 N 4 photocatalyst is limited in its performance due to the high complexation rate of photogenerated electrons and holes and the confined specific surface area. Herein, a S-scheme heterojunction catalyst involving tubular g-C 3 N 4 (TCN) and TiO 2 is designed and constructed via precursor reforming strategy with subsequent hydrothermal calcination process. The tubular structure offers more active centers, conducive to light absorption and contact with pollutants, while the heterojunction facilitates the transfer and separation of electrons and holes. Thus, the TCN/TiO 2 catalyst exhibits excellent photocatalytic activity with degradation efficiencies for methylene blue (MB) and tetracycline (TC) reaching 96.6 % and 100 %, respectively, as well as high degradation efficiency for other dyes (Congo red and Eosin y). Besides, TCN/TiO 2 catalyst demonstrates outstanding stability and potential for practical application. An innovative S-scheme heterojunction system has shown remarkable potential for improving the separation and transferring electron-hole pairs, as well as delivering stronger redox capability. This work provides a promising strategy for the preparation of g-C 3 N 4 /TiO 2 catalyst for the effective treatment of contaminated water.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 20
·6665
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IF 3.4
Manying Sun,Chuanwei Zhu,Su Wei,Liuyun Chen,Hongbing Ji,Tongming Su,Zuzeng Qin
Photocatalytic CO2reduction is a tactic for solving the environmental pollution caused by greenhouse gases. Herein, NH4H2PO4was added as a phosphorus source in the process of the hydrothermal treatment of melamine for the first time, and phosphorus-doped hollow tubular g-C3N4(x-P-HCN) was fabricated and used for photocatalytic CO2reduction. Here, 1.0-P-HCN exhibited the largest CO production rate of 9.00 μmol·g−1·h−1, which was 10.22 times higher than that of bulk g-C3N4. After doping with phosphorus, the light absorption range, the CO2adsorption capacity, and the specific surface area of the 1.0-P-HCN sample were greatly improved. In addition, the separation of photogenerated electron–hole pairs was enhanced. Furthermore, the phosphorus-doped g-C3N4effectively activated the CO2adsorbed on the surface of phosphorus-doped g-C3N4photocatalysts, which greatly enhanced the CO production rate of photocatalytic CO2reduction over that of g-C3N4.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zhuofan Han,Dengjie Zhong,Yunlan Xu,Haixing Chang,Lin Dong,Yi Liu
In this study, based on Ag@AgCl/tubular g-C 3 N 4 (Ag@AgCl/TCN) composite, Ag nanoparticles were deposited on its surface to form Ag nanofilm enhanced composite through photoreduction of excessive silver nitrate solution to obtain Ag nanofilm Ag@AgCl/TCN photocatalyst . Finally, Ag nanofilm Ag@AgCl/TCN/Ti photoanode was successfully prepared by silica-sol drop-coating method, and assembled with Cu 2 O/Cu cathode to construct a photocatalytic fuel cell (PFC). Ag nanofilm can not only enhance the light absorption and utilization of Ag@AgCl/TCN/Ti, but also extend its light response wavelength to visible light , and be used as an electron transfer medium to reduce internal resistance. The photocurrent density and the photoconversion efficiency of the Ag nanofilm/Ag@AgCl/TCN/Ti are 8.01 mA·cm −2 and 1.24%, respectively, which are 2.49 and 2.54 times those of the Ag@AgCl/TCN/Ti photoanode, respectively. The first-order kinetic constant and the maximum power density of the Ag nanofilm-coated Ag@AgCl/TCN/Ti-Cu 2 O/Cu PFC system are 0.064 min −1 and 46.37 μW·cm −2 , respectively, which are 1.39 and 1.94 times those of the Ag@AgCl/TCN-Cu 2 O/Cu PFC system, respectively. In addition, it degraded more than 95% of rhodamine B, 72.68% of tetracycline and 54.25% of bisphenol A within 60 min. The excellent performance of Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu is due to the strengthening of Ag nanofilm and the formation of S-type heterojunctions between AgCl and TCN. Free radicals (•Cl, h + , •OH, •O 2 - ) and non-radicals ( 1 O 2 ) are involved in the degradation reaction of RhB degradation. It is worth noting that 6% Ag nanofilm/Ag@AgCl/TCN/Ti-Cu 2 O/Cu has a positive effect on the production of •O 2 - , and its output is approximately 1.89 times that of the Ag@AgCl/TCN/Ti-Cu 2 O/Cu. A series of material characterization experiments have been completed and possible mechanisms of operation have been proposed. This study provides a new scheme for the design and preparation of high-efficiency photoanode of PFC.
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
ANALYTICA CHIMICA ACTA
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2023
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IF 6.2
Yuanyuan Zhang,Yuan Zhu,Tianjing Zeng,Lu Qiao,Mingjuan Zhang,Kexin Song,Nian Yin,Yani Tao,Yue Zhao,Chang Zhang,Yi Zhang
A highly sensitive photoelectrochemical aptasensor based on phosphorus-doped hollow tubular g-C 3 N 4 /Bi/BiVO 4 (PT-C 3 N 4 /Bi/BiVO 4 ) for tobramycin (TOB) detecting was developed. This aptasensor is a self-powered sensing system which could generate the electrical output under visible light irradiation with no external voltage supply. Based on the surface plasmon resonance (SPR) effect and unique hollow tubular structure of PT-C 3 N 4 /Bi/BiVO 4 , the PEC aptasensor exhibited an enhanced photocurrent and favorably specific response to TOB. Under the optimized conditions, the sensitive aptasensor presented a wider linearity to TOB in the range of 0.01–50 ng mL −1 with a low detection limit of 4.27 pg mL −1 . This sensor also displayed a satisfying photoelectrochemical performance with optimistic selectivity and stability. In addition, the proposed aptasensor was successfully applied to the detection of TOB in river water and milk samples.
研究领域:
分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
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