SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Zengyue Chen,Yunfeng Li,Fei Tian,Xin Chen,Zhansheng Wu
In this work, a green reaction route for the preparation of BiVO 4 /g-C 3 N 4 composite is constructed using the acetic acid and reusable ethylene glycol system combined with the microwave method. The rice grain-like BiVO 4 is successfully deposited on the surface of hollow tubular g-C 3 N 4 to form a S-scheme heterojunction within 25 min. The performance of the prepared photocatalysts is evaluated by removing glyphosate, methyl orange and tetracycline hydrochloride from simulated agricultural and urban runoff. The degradation evaluation results show that acetic acid in this route could play a better induction role compared to the conventional inducer nitric acid, while the ethylene glycol in this route can be recycled. The recovery of ethylene glycol could reach more than 85%, and the performance of the produced photocatalyst will not be decreased after the recovery of ethylene glycol reaches 20 times. The BV/CN 60 -R 20 sample has the highest photocatalytic activity for glyphosate removal under simulated sunlight irradiation, which is 14.5 times and 9.7 times higher than that of pure BiVO 4 and g-C 3 N 4 , respectively. In summary, the establishment of the ethylene glycol and acetic acid system not only provides a new perspective for the replacement of strong acids in the preparation of BiVO 4 -based photocatalyst but also provides a reference for the construction of other harmless and recyclable systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Wen-Chen Zhou,Wei-De Zhang
The development of stable and efficient non-noble metal-based photocatalysts for water splitting is currently a key but challenging process for effective conversion and storage of sustainable energy. Here, we designed a new non-noble metal composite photocatalyst by covalently connecting nickel molecular ligand (NiL) to the graphitized carbon nitride (CN) framework for photocatalytic hydrogen evolution under visible light irradiation. Compared to CN , NiL-modified CN (NiL/CN) shows excellent photogenerated carrier migration rate. Without Pt as a co-catalyst, NiL/CN exhibits high photocatalytic activity (23.4 μmol h −1 ) with high stability. Experiments and theoretical calculations disclose that ligand–metal charge transfer (LMCT) mechanism plays a key role on the enhancement of photocatalytic activity. This work provides a promising method for future designing low-cost, high-performance photocatalysts for hydrogen production under solar light.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Jiawei Zhang,Yuying Dang,Wei Wang,Haijuan Zhan,Xudong Song,Baojun Ma
g-C 3 N 4 has great potential as metal-free and low-cost photocatalyst . However, its efficiency of photo-excited carriers separation is very low, it needs large amount of Pt (such as 3.0%) to resolve this problem. Here, we designed composite co-catalyst (Pt/MoP) and prepared (Pt/MoP)/g-C 3 N 4 . The optimal activity of (Pt/MoP)/g-C 3 N 4 reaches 531.75 μmol/h/g with 1.0% Pt. Compared with 3.0%Pt/g-C 3 N 4 , the activity of (Pt/MoP)/g-C 3 N 4 increased 2 times, whereas the amount of Pt is reduced 3 times. Photoelectrochemistry , surface photovoltage (SPV) and transient photovoltage (TPV) spectra prove (Pt/MoP) can effectively separate photo-excited carriers, thereby improve photocatalyst activity of g-C 3 N 4 . Here, MoP acts as electron storage due to the large capacitance, and Pt acts as proton reduction sites. This article gives a method to effectively reduce the amount of noble metal in photocatalysts.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Yunhui Chen,Liping Wen,Jinxin Chen,He'an Luo,Jikai Liu
The clay mineral/g-C 3 N 4 composites were prepared through a simple one-pot synthesis with acid-treated clay minerals and melamine as precursors. Three typical clay minerals, e.g., kaolinite , sepiolite , and talc, were adopted as photocatalyst carriers. Notably, the acid-treated clay minerals coupled with g-C 3 N 4 in three different ways. The kaolinite/g-C 3 N 4 composite, in particular, proceeded with an intercalation reaction due to the in situ growth of g-C 3 N 4 within the layers of acid-treated kaolinite, leading to the expansion of kaolinite layers and a prominently large specific surface area of 61.9 m 2 g −1 . The resultant composites were used in photocatalytic H 2 generation by water splitting and CO 2 reduction, exhibiting superior photocatalytic performance to the g-C 3 N 4 . Among the obtained composites, the optimized kaolinite/g-C 3 N 4 showed the best photocatalytic activities , e.g. 3.03 μmol g −1 h −1 of CO evolution and 385 μmol g −1 h −1 of H 2 evolution, compared with merely 0.91 μmol g −1 h −1 of CO evolution and 96.4 μmol g −1 h −1 of H 2 evolution for bare g-C 3 N 4 . The superior performance of kaolinite/g-C 3 N 4 can be ascribed to the large specific surface area and better distribution of g-C 3 N 4 , which can enhance the light absorption , increase the number of active sites and favor the charge separation.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yundong Zeng,Yunlan Xu,Dengjie Zhong,Haoyang Yao,Nianbing Zhong
The development of traditional photocatalytic fuel cell (PFC) is severely hindered by poor visible-light response and limited reaction space. In this study, a visible-light responsive PFC with g-C 3 N 4 /BiOI/Ti photoanode was proposed and applied to activate peroxymonosulfate (PMS) to degrade rhodamine B. The degradation rate, maximum power density and maximum photocurrent density of the PMS/PFC system were respectively 95.39%, 103.87 μW cm −2 and 0.62 mA cm −2 , which was respectively 1.28, 2.18, and 1.98 times that of PFC. The excellent performance is attributed to the production of more reactive oxygen species and the extension of the reaction space range after the activation of PMS. The activation pathway of PMS and charge transfer pathway of the photoanode were discussed in detail, and it was proposed that PMS was activated by Z-scheme heterojunction g-C 3 N 4 /BiOI/Ti photoanode.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Xiaoming Liu,Suqing Wang,Fang Yang,Yinchu Zhang,Liushui Yan,Kexin Li,Huiqin Guo,Jiajun Yan,Jun Lin
In this paper, a novel Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite with 3D hierarchical microarchitecture has been successfully constructed by integrating Au/g-C 3 N 4 plasmonic photocatalyst composite with 3D ZnIn 2 S 4 nanosheet through a simple hydrothermal process. The Au nanoparticles were firstly anchored on the surface of pristine g-C 3 N 4 material to get Au/g-C 3 N 4 plasmonic photocatalyst. Ascribing to the surface plasmon resonance of Au nanoparticles , the obtained Au/g-C 3 N 4 plasmonic photocatalyst shows a significant improved photocatalytic activity toward hydrogen production from water with visible light response comparing with pristine g-C 3 N 4 . Further combining Au/g-C 3 N 4 plasmonic photocatalyst with 3D ZnIn 2 S 4 nanosheet to construct a heterojunction composite. Owing to the synergistic effect of the surface plasmon resonance of Au nanoparticles in Au/g-C 3 N 4 and the heterojunction structure in the interface of Au/g-C 3 N 4 and ZnIn 2 S 4 , the prepared Au/g-C 3 N 4 /ZnIn 2 S 4 plasma photocatalyst heterojunction composite shows an excellent photocatalytic activity toward hydrogen production from water with visible light response, which is around 7.0 and 6.3 times higher than that of the pristine C 3 N 4 and Znln 2 S 4 nanosheet, respectively. The present work might provide some insights for exploring other efficient heterojunction photocatalysts with excellent properties.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 24
·28321-28334
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IF 2.478
Jiang Yinying,Wang Yizheng,Zhou Kuan,Ding Senxu,Yu Jiang
In recent years, heterojunction photocatalytic materials have received more and more attention. Ball milling and microwave–assisted heating were used in this work to prepare the g–C 3 N 4 /TiO 2 heterojunction photocatalytic nanocomposites with different g–C 3 N 4 /TiO 2 mass ratios (0.5:1, 1:1, 2.5:1, 5:1, 10:1, 20:1, 30:1, and 40:1, labeled as TCN–1, TCN–2, TCN–3, TCN–4, TCN–5, TCN–6, TCN–7, and TCN–8, respectively). The crystal structure, morphology, and optical properties of the samples were characterized by various analytical techniques. The photocatalytic activity was evaluated by the degradation efficiency of Rhodamine B (RhB) and methylene blue (MB) under visible light and UV irradiation. After 120 min at visible light illumination, TCN–7 had the best degradation efficiency with 99.41% for RhB and 91.75% for MB, whereas after 120 min at UV light illumination, TCN–7 exhibited the best degradation effect, and the efficiency reached at 48.66% for RhB and 71.64% for MB, respectively. The analysis of crystal structure of the as–prepared TCN samples confirmed that TCN–7 has a good crystallinity, which is facilitated for photocatalytic activity. In photocatalytic reactions, superoxide radical (·O 2 − ), hydroxyl radical (·OH), and hole (h + ) are recognized as the main active groups, and ·O 2 – plays the main role for TCN–7 in the photocatalytic reaction system for the degradation of RhB.
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-12
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IF 5.7
Liu Xinyu,Yu Yang,Xie Tianhua,Cao Zijin,Li Zhiyan,Li Yuejing,Gu Yingqiu,Han Caiqin,Yang Guohai,Qu Lulu
Monolayer g-C 3 N 4 -modified Au/Ag nanorods (g-C 3 N 4 /Au/Ag NRs) array is fabricated as a dual-function platform with high surface-enhanced Raman scattering (SERS) response and excellent photocatalytic degradation ability for bisphenol A (BPA) residues. FDTD simulation results of Au/Ag NRs proves that the electromagnetic field intensity is significantly enhanced at the gap of Ag NRs and Au NPs and the protrusion of Au NPs, which endows the arrays with excellent SERS activity. The arrays exhibit high sensitivity for rhodamine 6G (R6G) (LOD = 1.1 × 10 -11 mol/L) and high SERS enhancement (EF = 9.2 × 10 7 ). In addition, the g-C 3 N 4 /Au/Ag NRs could degrade ˃90% of BPA adsorbed on the substrate surface within 140 min under visible light irradiation, and maintains its SERS activity after repeated use for 4 times. The dual-function platform with high SERS response and excellent recycling capability is proved to be reliable and is very promising for monitoring of BPA residues in food. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
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IF 22.1
Desen Zhou,Xuan Zhang,Zheng Li,Jun Zhang,Tielin Wang,Shaowen Cao
Photocatalytic conversion of CO 2 to usable fuels provides a new strategy for solving energy problems and the greenhouse effect. Porphyrin-based metal-organic frameworks (MOFs) are promising in photocatalysis due to their remarkable light harvesting ability, and the metal active site and its coordination environment can be further adjusted to achieve the high activity. In this work, g-C 3 N 4 /PCN-222 composites with different porphyrin metal centers were fabricated and the g-C 3 N 4 /PCN-222(Fe III ) catalyst showed the highest photocatalytic CO 2 reduction performance than that of g-C 3 N 4 /PCN-222(Fe II ) and other g-C 3 N 4 /PCN-222( M , M = Co, Ni, Cu, Zn) composites. Experimental studies and theoretical calculations showed that the axial coordination in g-C 3 N 4 /PCN-222(Fe III ) distorts the square planar field (Fe-N4) to quasi-octahedral coordination, which led to the moderate adsorption ability of CO 2 reduction intermediate (*CO), resulting in the high photocatalytic activity.
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ANALYTICAL CHEMISTRY
·
2017
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IF 6.32
Xue Li,Lusheng Zhu,Yunlei Zhou,Huanshun Yin,Shiyun Ai
A novel photoelectrochemical (PEC) assay is developed for sensitive detection of protein kinase A (PKA) activity based on PKA-catalyzed phosphorylation reaction in solution and signal amplification strategy triggered by PAMAM dendrimer and alkaline phosphatase (ALP). In this strategy, it is noteworthy at this point that PKA phosphorylation was achieved in solution instead of on the surface of the electrode, which has advantages of the good contact in reactants and simple experimental procedure. For immobilizing the phosphorylated peptide (P-peptide) on electrode surface, graphite-like carbon nitride (g-C3N4) and titanium dioxide (TiO2) complex is synthesized and characterized, which plays a significant role for TiO2 conjugating phosphate groups and g-C3N4 providing PEC signal. Subsequently, PAMAM dendrimer and ALP can be captured on P-peptide and TiO2/g-C3N4 modified ITO electrode via interaction between the -COOH groups on the surface of PAMAM dendrimer and the -NH2 groups of peptide and ALP, which can lead to the increase of ALP amount on the modified electrode surface assisted with the PAMAM dendrimer. As a result, the amount of ALP catalyzes of L-ascorbic acid 2-phosphate trisodium salt (AAP) to produce electron donor of ascorbic acid (AA), resulting in an increased photocurrent. The proposed detection assay displays high selectivity and low detection limit of 0.048 U/mL (S/N = 3) for PKA activity. This biosensor can also be applied for the evaluation of PKA inhibition and PKA activity assay in cell samples. Therefore, the fabricated PEC biosensor is potentionally well in PKA activity detection and inhibitor screening.
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Nanomaterials
·
2023
·Vol. 13
·期 22
·2964
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IF 5.3
Yilin Pan,Kai Qiao,Chuangyu Ning,Xin Wang,Zhiquan Liu,Zhihong Chen
g-C3N4has been regarded as a promising photocatalyst for photo-reforming antibiotics for H2production but still suffers from its high charge recombination, which has been proven to be solvable by constructing a g-C3N4homo-junction. However, those reported methods based on uncontrollable calcination for preparing a g-C3N4homo-junction are difficult to reproduce. Herein, an amorphous/crystalline g-C3N4homo-junction (ACN/CCN) was successfully synthesized via the electrostatic self-assembly attachment of negatively charged crystalline g-C3N4nanorods (CCN) on positively charged amorphous g-C3N4sheets (ACN). All the ACN/CCN samples displayed much higher photo-reforming of antibiotics for H2production ability than that of pristine ACN and CCN. In particular, ACN/CCN-2 with the optimal ratio exhibited the best photocatalytic performance, with a H2evolution rate of 162.5 μmol·g−1·h−1and simultaneous consecutive ciprofloxacin (CIP) degradation under light irradiation for 4 h. The UV–vis diffuse reflectance spectra (DRS), photoluminescence (PL), and electrochemical results revealed that a homo-junction is formed in ACN/CCN due to the difference in the band arrangement of ACN and CCN, which effectively suppressed the charge recombination and then led to those above significantly enhanced photocatalytic activity. Moreover, H2was generated from the water reduction reaction with a photogenerated electron (e−), and CIP was degraded via a photogenerated hole (h+). ACN/CCN exhibited adequate photostability and reusability for photocatalytic H2production with simultaneous CIP degradation. This work provides a new idea for rationally designing and preparing homo-junction photocatalysts to achieve the dual purpose of chemical energy production and environmental treatment.Keywords:H2production from wastewater;carbon nitride;homo-junction
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yuzhen Li,Zhaoxin Sun,Sufang Wang,Runbin Duan,Shaojie Wang,Shuo Li,Borong Lan,Lizhen Gao
Herein, the ternary CdS/Zn 2 In 2 S 5 /g-C 3 N 4 (CdS/ZIS/CN) heterojunction photocatalyst was successfully prepared via a one-pot method for photodegradation of tetracycline (TC) under visible light irradiation. The surface morphology, structure and optical properties of the prepared photocatalytic material were analyzed by XRD , SEM , TEM, UV–vis DRS, FT-IR and PL . Moreover, the experimental results exhibited that the ternary CdS/ZIS/CN photocatalyst revealed excellent photocatalytic activity compared with g-C 3 N 4 . In this work, 94.73% of TC (20 mg/L, pH=11) was degraded by 0.5 g/L 30CdS/ZIS/CN within 60 min of visible light irradiation. Additionally, the degradation rate of the photocatalyst decreased by about 9.41% after the fourth cycle, indicating its high stability and reusability. Subsequently, a possible double type-II mechanism of photodegradation was eventually provided based on active radical capture experiments. The current investigation provided a promising strategy to construct the high-efficiency heterojunction photocatalyst to degrade antibiotic contaminants.
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