APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Jianmei Pan,Yahai Zhang,Yi Guan,Yingnan Yan,Hua Tang,Xianglong Liu,Mengdi Wang,Xiangxin Wei
The development of hydrogen (H 2 ) production photocatalyst with low cost, non-precious metal and high-activity for commercial application is a long-term target and challenge. In this work, novel silicon carbide (SiC) nanofibers/graphitic carbon nitride (g-C 3 N 4 ) nanosheets (SiC/CNNS) decorated via multipurpose nickel (Ni) nanoparticles were prepared by an easy heat treatment followed by hydrothermal method. The tight Ni interface layers as cocatalyst and electron transfer mediator can significantly enhance the H 2 production property over SiC/CNNS nanoheterojunctions under light-emitting diode (LED) illumination. The optimal Ni/SiC/CNNS with a mass fraction of 10% Ni loading shows the most superior H 2 -generation rate of 6183 μmol g −1 h −1 , which is approximately 53, 3 and 227 times compared to CNNS, 10 %Ni/CNNS and SiC/CNNS, respectively. The metallic Ni nanoparticles play the leading and multifunctional roles in improving photocatalytic activity, including collecting the photo-generated electrons efficiently, transferring and separating the charge carriers rapidly, facilitating the H 2 -production kinetics and decreasing the overpotentials of surface reactions for H 2 -production. It is highly expected that the multipurpose and non-precious metal cocatalyst to form tight interface layers can supply a simple and universal strategy to design high-efficiency cocatalyst-semiconductor–semiconductor photocatalysts for H 2 production.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
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2021
·Vol. 151
·期 12
·3592-3602
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IF 3.186
Chi Xianhu,Tan Siyu,Song Jun,Liu Fengjiao,Tian Yaxi,Yuan Haibin,Guan Rongfeng
g-C 3 N 4 has received much attention due to its role in photocatalytic hydrogen evolution and contaminants degradation. Nevertheless, the photocatalytic property of bulk g-C 3 N 4 (BCN) is seriously restricted owing to its short photo-generated carrier lifetime, small specific surface area and low visible light utilization rate, etc. In this study, nanosheet constructing and heteroatom phosphorus (P) doping, as two important strategies, are synergistically adopted to co-enhance its activity. The controllable P atoms were successfully doped into the framework of g-C 3 N 4 nanosheet (NCN-P) through forming P-N bond. The optimized NCN-P sample displays an excellent H 2 production rate (3263.99 µmol·g −1 ·h −1 ) under white LED light irradiation, which is more than 11.6 times that of the BCN. Moreover, it also exhibits excellent photocatalytic degradation ratio of tetracycline reached 80% in 1 h. Furthermore, the optimized NCN-P sample still maintains robust photocatalytic performance after recycling tests, making it as a bright prospect photocatalyst for solar energy utilization and contaminants removal. Graphic Abstract
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Tingting Song,Xiaoyan Meng,Huayu Wang,Chao Zhang,Ming Ge
Heterogeneous photocatalysis/persulfate oxidation process has been regarded as a promising technology for antibiotic contaminants removal. Magnetic ZnFe 2 O 4 /Ag composite catalyst was synthesized to activate peroxydisulfate (PDS) toward tetracycline (TC) degradation under the visible-LED-light irradiation. The synergistic effect of ZnFe 2 O 4 and Ag endowed the optimized ZFO/Ag-15 with excellent photocatalytic performance for PDS activation and TC degradation, and 90.06 % of TC (20 mg/L) was efficiently degraded after 80 min of reaction. Ag can enhance the visible light absorption of ZnFe 2 O 4 and accelerate the separation of photo-induced electron/hole pairs, thereby promoting the generation of O 2 − and SO 4 − radicals. In addition, Ag can directly activate PDS to generate SO 4 − . Although the catalytic performance of magnetic ZFO/Ag-15 gradually decreased after each cycle due to the corrosion of Ag and the formation of inactive AgO, the catalytic activity of used catalyst was partially recovered by heat treatment. Quenching experiments and EPR tests indicated that the free radical (O 2 − , SO 4 − and OH) and non-free radical ( 1 O 2 , h + ) oxidation processes cooperated to degrade TC in Vis-ZFO/Ag-15/PDS system. The effect of operational factors (PDS concentration, temperature, solution pH, coexisting inorganic anions and humic acid) on TC degradation was investigated, and TC removal from the different water matrices (river water, tap water and secondary effluent) was also evaluated. The degradation products were detected using LC-MS and the possible TC degradation pathways were established.
研究领域:
环境科学
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化学工程
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材料科学
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水处理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jing Wang,Qingfeng Fan,Lidong Kou,Huan Chen,Xing Xing,Wenjie Duan,Kai Jiang
Oxygen vacancies (OVs) and heterostructures of photocatalysts play crucial roles in photocatalysis driven by visible light. In this study, a novel photocatalytic textile was prepared by spraying heterostructures of OVs-rich bismuth oxide (BiO 2-x ) and urea-derived graphitic carbon nitride (UCN) on amine group-modified poly(acrylonitrile) nonwoven textile (APAN), and then studied for sulfamethazine (SMT) removal and bacterial ( S. aureus ) disinfection under irradiation of energy-efficient white light emitting diodes (LEDs). The optimal BiO 2-x , prepared within a much shorter time (i.e. 1 h), was actually a ternary mixture of NaBiO 3 -Bi 2 O 3 -BiO 2-x with rich OVs rather than pure BiO 2-x . Incorporation of UCN could help redistribute electrons and induce formation of more OVs, thereby improve the photocatalytic activity of the BU-0.2 hybrid (i.e. mass ratio of BiO 2-x /UCN = 1:0.2). The BU-0.2 could use full-spectrum white light (i.e. 380–760 nm) to achieve superior SMT removal in a wide pH range (pH 5.0–9.0) and in the co-presence of common water constituents. The enhanced photocatalytic performance of BU-0.2 was attributed to the formation of OVs and heterostructure, which could broaden light absorption, help charges separation, and favor adsorption and activation of molecular O 2 . Detection of reactive species demonstrated that 1 O 2 and holes were the dominant factors responsible for SMT removal. Spraying deposition of BU-0.2 on APAN could endow the resultant textile (i.e. APAN-BU-0.2) with excellent photocatalytic activity for SMT removal and bacterial disinfection under LED white light irradiation. The as-prepared photocatalysts showed promising application prospects in purification of emerging pollutants utilizing LED white light.
研究领域:
环境科学
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材料科学
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光催化
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水处理
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纺织工程
✓ 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）