Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Hongji Li,Dandan Wang,Chun Miao,Fengwu xia,Yubo Wang,Yutong Wang,Chunbo Liu,Guangbo Che
Photo-degradation of pollutant and photo-reduction of CO 2 are efficient ways to address challenges of water pollution , the greenhouse effect and energy crisis, respectively. In our work, via fastening two-dimensional (2D) BiOI nanoplates on 2D g-C 3 N 4 nanosheets , a BiOI/g-C 3 N 4 (BI/CN) S-scheme photocatalyst with closely stacked structure were prepared though a self-assembly process. The prepared BI/CN S-scheme heterojunction could improve the transfer and separation efficiency of photo-generated electron-hole pairs by facilitating the electrons transfer from BiOI to g-C 3 N 4 . Under visible light exposure, the photo-degradation efficiencies of tetracycline hydrochloride (TC) and p-chlorophenol (4-PC) by BI/CN-50% reached nearly 100% and 46%, respectively, which were more excellent in comparison with other samples. And BI/CN-50% sample exhibited the best CO production (12.45 μmol∙g −1 ) with visible-light irradiation of 4 h. This value was approximately 4.37 and 5.41 times higher than that of BI (2.85 μmol∙g −1 ) and CN materials (2.30 μmol∙g −1 ), respectively. Moreover, the excellent photocatalytic performance had no visible decay during five cycles. Meanwhile, an S-scheme charge transfer process was confirmed by species trapping experiments and electron spin-trap analysis. This study offers new insights into the activity, kinetics, and mechanism over BiOI-based materials for photocatalysis technology .
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ANALYTICA CHIMICA ACTA
·
2022
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IF 6.911
Haoye Wang,Aijuan Xie,Shuji Li,Jiajun Wang,Kaixuan Chen,Zilong Su,Ningning Song,Shiping Luo
A three-dimensional g-C 3 N 4 /MWNTs/GO hybrid modified electrode was constructed as an electrochemical sensor for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). Due to the high conductivity of MWCNTs and the strong synergy between g-C 3 N 4 and GO , the combination of the three effectively improved the electrocatalytic activity of the modified electrode for the oxidation of AA, DA, and UA, and solved the problems such as overlapping anodic peaks. The electrochemical performance of the as-constructed sensor was investigated and optimized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The linear response range of AA, DA, and UA in the optimal condition was 0.2–7.5 mM, 2–100 μM, and 4–200 μM, respectively. The detection limits (S/N = 3) of AA, DA, and UA were 96, 0.22, and 1.36 μM, respectively. The recoveries of AA, DA and UA in serum samples from three groups were 92.82–106.50%, and the relative standard deviations were less than 2%. The results show that the as-constructed g-C 3 N 4 /MWNTs/GO modified electrode has the advantages of simplicity, high sensitivity and good selectivity , and can simultaneously determine AA, DA, and UA.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xufei Li,Yanling Qiu,Zhiliang Zhu,Ting Chen,Hua Zhang,Daqiang Yin
Insufficient photocatalytic activity and poor recyclability are considered as two main factors that limit the further application of photocatalysts in environmental remediation. Herein, a new magnetic g-C 3 N 4 /α-Fe 2 O 3 /Bi 3 TaO 7 (CN/FO/BTO) heterojunction with dual Z-scheme system was first synthesized via an ultrasound-assisted calcination process. The results showed that the removal efficiency of ciprofloxacin (CIP) by optimized CN/FO/BTO heterojunction could reach 95.6% within 120 min illumination of visible light, which was 6.1, 15.9, 5.2, 3.7 and 2.3 times as much as that of single CN, FO, BTO, binary CN/FO and CN/BTO, respectively. Characterization analysis indicated that the improved photocatalytic activity derived from the synergistic effects of the three components, including the dispersion of FO and BTO by CN sheet, the enhanced light absorption of CN by addition of FO and BTO, and the reduced photogenerated charge recombination by their intimate contact. Further mechanism study revealed that the dual Z-scheme system of CN/FO/BTO leaded to efficient photoexcited carrier separation and strong redox capacity, in which •O 2 – and •OH were main radicals during photocatalytic process. Meanwhile, CN/FO/BTO possessed supreme adaptability to pH as well as co-existing matters, favorable magnetic separation property and excellent stability, making it a potential candidate for environmental remediation applications.
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APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Chao Yin,Yali Liu,Xiaorong Kang,Xin Li
Graphitic carbon nitride (g-C 3 N 4 , CN) has been applied to degrade a variety of pollutants. However, two major defects, the low utilization of light energy and the high recombination of photogenerated electron and hole (e - -h + ) pairs, need to be improved. In this study, a LED-light-driven photocatalyst, carbon dots decorated graphitic carbon nitride (CNC), was successfully prepared by simple thermal polymerization. Due to the remarkable up-conversion photoluminescence properties and superior charge transport capability of CDs, CNC had higher e - -h + separation efficiency and broader visible light response. In this experiment, a combined process of CNC and persulfate (CNC/PS) was used for tetracycline (TC) degradation. High-efficient photocatalytic degradation rate of 81.9% was obtained in the CNC/PS system. Moreover, the mechanism analysis indicated that the reaction between PS and photogenerated e - effectively promoted the separation of electrons-holes pairs, thereby enhancing the formation of dominant active radicals •O 2 - and holes for TC degradation.
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 13
·6267-6273
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IF 3.925
Qinyi Mao,Dandan Li,Yuming Dong
Recently, much attention has been focused on the development of photocatalysts for hydrogen evolution. Up to now, efficient hydrogen generation is still greatly challenging due to the restraints of the surface redox reaction rate, and the introduction of a co-catalyst is one of the keys to this problem. Here, dual non-noble co-catalysts NixP and Mn3O4 were proposed and prepared on a g-C3N4/red phosphorus (CNP) hybrid structure with a high light adsorption capability by a two-step photo-deposition method. The photo-excited charge on the composite catalyst separate and transfer from C3N4 to red phosphorous due to a type I heterojunction structure. NixP and Mn3O4 act as reductive and oxidative co-catalysts, respectively. The hydrogen production rate was 5851.3 μmol g−1 h−1, 12.4 times that of pure CNP. The consistent catalytic activity in an actual 25 mL flask for hydrogen evolution over eight hours accumulated 245.08 μmol H2 under solar simulated irradiation. This work provides practical reference for the development of a novel inexpensive photocatalyst system.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Ganghua Zhou,Lirong Meng,Xin Ning,Weiqin Yin,Jianhua Hou,Qiao Xu,Jianjian Yi,Shengsen Wang,Xiaozhi Wang
Constructing type II heterojunction is an efficient strategy to enhance the light absorption and promote the charge transport. However, the improvement effect is limited by the decreased redox ability of charge carriers. The rational design of heterojunction from type II to Z-scheme is expected to overcome this obstacle. Herein, we demonstrate that the introduction of interfacial oxygen vacancies (OVs) can switch charge transfer of g-C 3 N 4 /BVO heterojunction from type II to Z-scheme. The interfacial OVs acted as the reactive center of charge carriers to quench the electrons of BVO and holes of g-C 3 N 4 , thereby promoting charge separation and migration. As a result, the interfacial OVs mediated Z-scheme g-C 3 N 4 /BVO heterojunction kept the strong oxidation/reduction potential of two single-component photocatalysts thereby significantly enhancing the photodegradation of tetracycline and CO 2 photoreduction. The kinetic constant of tetracycline degradation on the optimal g-C 3 N 4 /BVO-20 sample was 2.04-fold and 2.29-fold higher than those on g-C 3 N 4 nanosheets and pure BVO, respectively. This work provides a feasible strategy by the interfacial vacancy engineering of heterojunction for enhanced photocatalysis .
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 8
·3727-3737
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IF 3.925
Zhujun Huang,Dongying Zhu,Haiyan Wang,Jinhua Luo,Chenxi Zhao,Fuyou Du
Developing excellent photocatalysts for pollutant degradation is of vital significance but still a big challenge. In this work, an electrospun g-C3N4/Bi12O17Cl2/poly(acrylonitrile-co-maleic acid) (E-spun g-C3N4/Bi12O17Cl2/PANCMA) nanofiber photocatalyst was fabricated by coaxial electrospinning of g-C3N4/Bi12O17Cl2 and PANCMA and showed high adsorption capacity and excellent visible light catalytic degradation performance with the adsorption amount and degradation rate of antibiotic ofloxacin (OFL) as high as 4.44 mg g−1 within 6 min and 94% within 20 min, respectively. Compared to pure g-C3N4 and Bi12O17Cl2, the g-C3N4/Bi12O17Cl2 heterojunction showed higher visible light absorption and degradation ability, ascribed to the synergistic effect of g-C3N4 and Bi12O17Cl2 on the separation and utilization efficiency of photogenerated electron–hole pairs. E-spun g-C3N4/Bi12O17Cl2/PANCMA nanofibers exhibited highly efficient photocatalytic activity over a wide pH range of 4.0–8.0 and some interference of metal ions and inorganic anions, and the reactive species including holes (h+), superoxide radicals , and hydroxyl radicals (˙OH) all participated in the photocatalytic degradation of OFL. Moreover, the E-spun g-C3N4/Bi12O17Cl2/PANCMA possessed excellent cycling stability of 81.9% efficiency retention after fifteen consecutive tests. In addition, the possible degradation mechanism, intermediate products and degradation pathways of OFL were investigated by ESR tests, radical scavenger experiments, and LC-MS analysis. This study developed a feasible exemplificative strategy for fabricating new highly efficient and reusable photocatalyst candidate materials to remove environmental pollutants.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 7
·4482-4496
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IF 2.779
Wang Tao,Ding Huihui,Xiao Huan,Sun Tianyi,Xu Jiahui,Zhang Zhengmei,Bian Haiqin,Li Shuang,Zhang Hengyang
In this article, P-g-C 3 N 4 /TiO 2 (the protonated g-C 3 N 4 is noted as P-g-C 3 N 4 ) heterojunction photocatalytic materials with hollow sphere structure were synthesized mainly by high-temperature calcination and secondary hydrothermal methods. To obtain highly efficient heterojunction catalytic materials with more uniform surface compounding, we protonated and exfoliated ultrasonically the obtained g-C 3 N 4 before compounding further, which changed its morphology while retaining its semiconductor properties and optical band gap unchanged, and finally obtained the ultra-thin nanoflake structures. On this basis, an optimal proportion of the highest catalytic activity between these two substances was explored by degrading RHB. It was found that the highest catalytic activity of the complexes was achieved at 110 min with a weight ratio of 0.1 of P-g-C 3 N 4 to TiO 2 after protonating under the same conditions, and complete degradation was reached at 110 min. Afterward, to further investigate its physicochemical properties, we made various characterizations and proposed a suitable catalytic mechanism of Z-scheme regarding its excellent catalytic properties.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 27
·70260-70276
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IF 5.8
Yang Guoliang,Jiang Yan,Yin Bingjie,Liu Guocheng,Ma Dong,Zhang Guangshan,Zhang Guodong,Xin Yanjun,Chen Qinghua
Polycyclic aromatic hydrocarbons (PAHs) in soil have potential harm on human health. However, remediation of PAH-contaminated soils through photocatalytic technology remains a challenge. Therefore, the photocatalyst g-C 3 N 4 /α-Fe 2 O 3 was synthesized and applied to photocatalytic degradation of fluoranthene in soil. The physicochemical properties of g-C 3 N 4 /α-Fe 2 O 3 and various degradation parameters, such as catalyst dosage, the ratio of water/soil, and initial pH, were investigated in detail. In soil slurry reaction system (water/soil=10:1, w/w), the optimal degradation efficiency on fluoranthene was 88.7% after simulated sunlight irradiation for 12 h (contaminated soil=2 g, initial fluoranthene concentration=36 mg/kg, catalyst dosage=5%, and pH=6.8), and the photocatalytic degradation followed pseudo-first-order kinetics. The degradation efficiency of g-C 3 N 4 /α-Fe 2 O 3 was higher compared with P25. Degradation mechanism analysis showed that •O 2 - and h + are the main active species in photocatalytic degradation process of fluoranthene by g-C 3 N 4 /α-Fe 2 O 3 . Coupling g-C 3 N 4 and α-Fe 2 O 3 enhances the interfacial charge transport capacity via Z-scheme charge transfer route and inhibits the recombination of photogenerated electrons and holes of g-C 3 N 4 and α-Fe 2 O 3 , then significantly improves the production of active species and photocatalytic activity. Results showed that photocatalytic treatment of soil by g-C 3 N 4 /α-Fe 2 O 3 is an effective strategy for remediation of soils contaminated by PAHs.
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ENVIRONMENTAL RESEARCH
·
2023
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IF 8.3
Chunyan Hu,Jinke He,Jianjun Liang,Tao Lin,Qiuliang Liu
A novel photo-Fenton catalyst α-Fe 2 O 3 @g-C 3 N 4 @NH 2 -MIL-101(Fe) (FGN) with dual Z-scheme heterojunction was successfully prepared by hydrothermal method to degrade tetracycline (TC). The preparation conditions were optimized by orthogonal test, and the successful synthesis was confirmed by characterization analyses. The prepared FGN showed better light absorption performance, higher photoelectrons-holes separation efficiency, lower photoelectrons transfer resistance, and higher specific surface area and pore capacity compared with α-Fe 2 O 3 @g-C 3 N 4 and α-Fe 2 O 3 . The effects of experimental conditions on the catalytic degradation of TC were investigated. The degradation rate of 10 mg/L TC could reach 98.33% within 2 h when the dosage of FGN was 200 mg/L, and the degradation rate could remain 92.27% after 5 times of reuse. Furthermore, the XRD spectra and XPS spectra of FGN before and after reuse were compared to explore the structural stability and catalytic active sites of FGN, respectively. According to the identification of oxidation intermediates, three degradation pathways of TC were proposed. Through H 2 O 2 consumption experiment, radical-scavenging experiments, EPR results, the mechanism of the dual Z-scheme heterojunction was proved. The improved performance of FGN was attributed to the dual Z-Scheme heterojunction effectively promoting the separation of photogenerated electrons from the holes and accelerating the electrons transfer , and the increase of the specific surface area.
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RSC Advances
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2023
·Vol. 13
·期 19
·13142-13155
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IF 3.9
Jiancheng Li,Chi Wang,Yixing Ma,Kai Li,Yi Mei
A new heterojunction material BP/RP-g-C3N4/SiO2 was obtained by a one-step ball milling method, and its photocatalytic capacity was researched by the degradation of Rhodamine B (RhB) and ofloxacin (OFL) in simulated sunlight. The construction of an in situ BP/RP heterojunction can achieve perfect interface contact between different semiconductors and effectively promote the separation of photogenerated carriers. The composite material was well characterized, which proved that the multi-heterogeneous structure was prepared. Furthermore, the type II heterojunction was formed between the g-C3N4 and BP/RP interface, playing an important role in the degradation and promoting electron transfer. The degradation effect of BP/RP-g-C3N4/SiO2 on RhB reached 90% after 26 min of simulated solar irradiation, which was 1.8 times that of g-C3N4/SiO2. The degradation of OFL by BP/RP-g-C3N4/SiO2 reached 85.3% after illumination for 50 min, while the degradation of g-C3N4/SiO2 was only 35.4%. The mechanisms were further discussed, and ˙O2− and h+ were found to be the main active substances to degrade RhB. The catalyst also revealed distinguished stability of catalyst and recyclability, and the degradation effect of RhB can still realize 85% after 4 runs of experiment. Thus, this study provided a novel method for the design and preparation of multi-heterojunction catalysts in the removal of organic pollutants from wastewater.
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ACS Applied Nano Materials
·
2023
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IF 5.9
Hui Zhong,Yonghua Yuan,Min Qing,Jianli Zuo,Yueyuan Li,Lijuan Bai
The extracellular domain of the human epidermal growth factor receptor (HER2-ECD) is a breast cancer biomarker. Accurate and sensitive detection of HER2-ECD concentration in serum is crucial in the diagnosis and patient follow-up. Herein, an “off–on” type electrochemiluminescence (ECL) aptasensor based on the resonance energy transfer (RET) between AuPt@ZIF-67 and AuNPs/g-C3N4/PDDA was developed for detecting HER2-ECD. First, AuNP-modified g-C3N4 (AuNPs/g-C3N4/PDDA), as a signal substrate, generates ECL signals under the co-reactant peroxodisulfate (S2O82–) in a specific potential range and shows significantly enhanced signal strength and stability. Then, AuPt@ZIF-67 expeditiously quenched the ECL signal of AuNPs/g-C3N4/PDDA because of ECL resonance energy transfer (ECL-RET) between AuPt@ZIF-67 and AuNPs/g-C3N4/PDDA. We designed a new aptasensor detection platform for HER2-ECD detection. After specific binding of the aptamer with HER2-ECD, the AuPt@ZIF-67 content in the system decreased, and the ECL response recovered. The biosensor demonstrated a linear range of HER2-ECD detection between 100 fg/mL and 100 ng/mL under ideal circumstances, with a low detection limit of 17.3 fg/mL. Furthermore, this biosensor was successfully tested in human serum samples. This strategy, as a novel ECL system with satisfactory stability and excellent sensitivity, can realize the detection of other biological molecules by changing the probe, which is a promising method.
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