BIOSENSORS & BIOELECTRONICS
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2022
·
IF 12.545
Xiao Chen,Wenqin Wu,Qi Zhang,Cheng Wang,Yingying Fan,Huimin Wu,Zhaowei Zhang
Designing a photoelectrochemical (PEC) biosensor with preponderant sensitivity and anti-interference is a challenge for detecting small molecules in real samples with complex matrices . To this end, the Bi 2 O 3 /CuBi 2 O 4 was synthesized in one step to enhance visible light's absorption ability, transferring the interfacial carrier's efficiency, a high-active Z-scheme heterojunction , and a photocathode biosensor was proposed. For the first time, we used the density functional theory to verify a Z-scheme transfer pathway of photogenerated electrons in Bi 2 O 3 /CuBi 2 O 4 and the energy band structure of Bi 2 O 3 and CuBi 2 O 4 , respectively. Bi 2 O 3 /CuBi 2 O 4 -based PEC biosensor was developed for competive immunoassay of small molecular, aflatoxin B1 (AFB1) as an example, resulting in a low detection limit of 297.4 fg/mL and a linear range of 1.4 pg/mL-280 ng/mL in urine, water, peanut, and wheat samples. Using spiked experiments, the satisfied repeatability, reproducibility, stability, and specificity of the Bi 2 O 3 /CuBi 2 O 4 -based PEC biosensor indicated a promise for application in health care, the environment, and food.
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PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Weili Huang,Junhui Yi,Xiaoying Liao,Changquan Jiao,Runkun Xie,Beifang Chen,Zebo Lin,Yupeng Yang,Weitao Liu,Huimei Mo
AgVO 3 and AgI have attracted great interest in environmental remediation. Aiming at enhancing the catalytic activity and stability of AgVO 3 . Visible light response Z-scheme AgI/Ag/AgVO 3 hybrid nanorods were prepared by in situ reduction and ion exchange grown. The results of characterization and experiment showed that obtained hybrid material are primarily composed of AgVO 3 nanorods, whose surface were closely attached to AgI and Ag particles. Compared with AgVO 3 and Ag/AgVO 3 , the absorbance of Z-scheme AgI/Ag/AgVO 3 hybrid nanorods in the visible light region is dramatically enhanced. The degradation efficiency of sample is five times of that of AgVO 3 and four times of that of Ag/AgVO 3 , respectively. And the degradation efficiency still keep 90% after the fourth repeat experiment. The trapping experiments of active species confirmed that the contribution of the degradation for AO-II is mainly attributed to h + and ∙O 2 − . The efficient photocatalytic activity can be explained by Z-type mechanism, which promote effective separation of photogenerated charges. This study provides an idea for the design of efficient visible light photocatalysts .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yuqing Lu,Chunsheng Ding,Jun Guo,Wei Gan,Peng Chen,Miao Zhang,Zhaoqi Sun
There is a high demand for photocatalysts that can efficiently degrade antibiotics; however, there are challenges in technological development related to charge transfer and light capture ability. In this study, ternary Bi 2 MoO 6 /GQDs/TiO 2 (denoted as BGT; GQDs refer to graphene quantum dots) heterojunction photocatalysts with high ciprofloxacin (CIP) photodegradation efficiency were successfully prepared. BGT with a 0.20 mL GQD dispersion solution (BGT-2) exhibited the highest CIP photodegradation efficiency (90.21 %). The rate constant of BGT-2 was 15.49 × 10 −3 min −1 , which was 4.01, 4.16, and 9.22 times higher than those of Bi 2 MoO 6 /TiO 2 (3.86 × 10 −3 min −1 ), Bi 2 MoO 6 (3.72 × 10 −3 min −1 ), and TiO 2 (1.68 × 10 −3 min −1 ), respectively. The degradation efficiencies of amoxicillin and tetracycline hydrochloride were 78.98 % and 92.49 %, respectively. The effects of pH values, water sources, and inorganic anions on CIP degradation were systematically explored. In addition, three environmentally friendly degradation pathways were proposed based on liquid chromatography-mass spectrometry (LC-MS) results and the toxicity evaluation of the various intermediates. Testing the optical and electrochemical properties of the catalysts showed that the synthesized dual Z-scheme heterojunctions can significantly improve the light capture ability and reduce the photogenerated electron-hole recombination rate, effectively addressing the challenges encountered with the use of photocatalysts.
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TALANTA
·
2022
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IF 6.556
Yi Wu,Keren Lu,Fubin Pei,Yanghao Yan,Shasha Feng,Qingli Hao,Mingzhu Xia,Wu Lei
The wide clinical application of d -penicillamine (D-PA) makes it inevitably accumulates in the environment, seriously threatening human health and the ecological environment. To better supervisory control D-PA, a highly sensitive and reliable photoelectrochemical (PEC) sensor based on gold nanoparticles (Au NPs) loaded on graphitic carbon nitride sheet and hexagonal NH 2 -UiO-66 composite (g-C 3 N 4 /Au/NH 2 -UiO-66) was synthesized. Tactfully using the strong bonding between D-PA and Au NPs and the effective carrier separation of Z-scheme heterojunction, the designed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC sensor without an extra recognition unit exhibited a selective and sensitive photocurrent to D-PA. With the aid of UV diffuse reflectance spectra (UV-DRs), electron paramagnetic resonance (EPR) characterization, and free radical capture experiments, the electron transfer path of the PEC sensing system was deduced. The proposed g-C 3 N 4 /Au/NH 2 -UiO-66 PEC-based sensor achieved a low detection limit of 0.0046 μM (S/N = 3) with a wide linear response ranging from 10 nM to 400 μM. In addition, its good stability and selectivity also laid a good foundation for practical applications.
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高影响因子
JOURNAL OF POROUS MATERIALS
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2022
·Vol. 29
·期 5
·1431-1440
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IF 2.523
Zhang Shixian,Rong Xinshan,Sun Ting,Gao Ping,Liu Jun,Qiu Xuchun,Zhou Xiangtong,Wu Zhiren
An energy-efficient and environmentally friendly nitrogen fixation process is urgently needed to solve problems of high energy consumption and high emissions in the traditional ammonia industry. In this work, a Z-scheme porous g-C 3 N 4 /ZnFe 2 O 4 photocatalyst was synthesized, characterized and employed for N 2 photofixation. Temperature programmed desorption characterization confirmed that the adsorption capacity of nitrogen was improved for the porous structure. From N 2 photofixation evaluation experiments, the highest ammonia production efficiency can reach 147.33 μmol/L within 120 min. Photocatalytic performance is greatly improved because of the increasing of specific surface areas, enhancement of N 2 adsorption ability and synergistic effect of Z-scheme photocatalytic system. In the ammonia production process of the research, visible light is used as energy; N 2 and H 2 O are used as raw materials, which possesses a good application potential due to the advantages of being energy-efficient, environmentally friendly and pollution-free.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yang Li,Qiao Yin,Yingshan Zeng,Zhi Liu
The core of realizing the effective CO 2 conversion by solar energy is to develop a stable photocatalyst with high CO 2 adsorption capacity and high charge separation efficiency. In this work, a hollow spherical Z-scheme SnS 2 /g-C 3 N 4 /C (SCC) photocatalyst is successfully constructed by a morphology-inherited strategy. Biomass mabospores are utilized as both the precursor for formation of hollow spherical structure and carbon source, and the g-C 3 N 4 and SnS 2 nanosheets tightly anchor on the surface of mabospores-derived carbon spheres. The Z-scheme SCC heterostructure exhibits 5.5 times activity enhancement on CO 2 photoreduction to CO with a high evolution rate up to 40.86 μmol∙g −1 ∙h −1 . Examined by various photoelectrochemical analysis, the boosted photocatalytic activity originates mainly from the construction of hollow spherical Z-scheme heterojunction, providing the more preferable basic sites for CO 2 adsorption, promoting the separation efficiency of electron-hole pairs, as well as increasing the reductionability of electrons in conduction band of g-C 3 N 4 . The formed internal electric fields between the g-C 3 N 4 and SnS 2 can also further reinforce the spatial separation of photogenerated charge carriers. Theoretical calculations further verify that the SCC Z-scheme heterostructure can effectively decrease the energy barriers of formed intermediates, especially the crucial COOH*, and thus leading to the facile conversion of CO 2 -to-CO. This work induces a new strategy to construct g-C 3 N 4 -based Z-scheme heterojunction assisted by versatile biomasses with optimized structure and enhanced photoelectrochemical merits for efficient CO 2 conversion into chemical fuels.
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Shirong Kang,Hao Zhang,Mingyu Dou,Gaimei Gao,Hongjie Zhu,Hua Yang,Dacheng Li,Jianmin Dou
The heterojunction structure with CdS@g-C 3 N 4 photocatalyst was obtained via a simple microthermal chemical in-situ deposition method. The catalyst CdS@g-C 3 N 4 (weight ratio of 1:3) maintained excellent degradation activity to 10 ppm tetracycline (TC) after four cycles due to Z-scheme electron transport mechanism, which was demonstrated through several methods, and the photo-corrosion of CdS was inhibited successfully own to this electron transfer paths. Microscope images showed CdS nanoparticles were uniformly distributed on g-C 3 N 4 nanosheets , such surface morphology provided numerous active sites and excellent adsorption performance for photodegradation process. Mechanism study demonstrated the high energy active species including h + , •O 2 − and •OH take part in the degradation process. Through the mass spectrometry analysis , intermediate products and degradation pathway were inferred on TC during photodegradation process. In addition, this study proved the extremely low toxicity of TC aqueous solution after degradation, there was special significance for ecological and environmental protection. This work provided a reference for the design of the Z-scheme photocatalyst and synthesis of catalysts at low temperature (80 °C), and it has application potential in the treatment of water pollution.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Fangshu Xing,Renyou Zeng,Chuchu Cheng,Qiuwen Liu,Caijin Huang
Efficient aromatic alcohol oxidation with simultaneous H 2 evolution under aqueous conditions is achieved in a polyoxometalate (POM)-incorporated ZnIn 2 S 4 dual-functional photocatalytic system. The synergy between HPM and ZIS contributes to the formation of a Z-type heterojunction structure and thus enhances redox capacity. Moreover, the sub-nanometer size of POM clusters endows molecular-level interfacial contact, which acts as an "electron bridge" ensuring faster interfacial charge transfer kinetics. Therefore, an impressive nearly 100% yield of benzaldehyde and 10.6 mmol·g −1 ·h −1 H 2 -evolution rate are observed for POM/ZIS nanocomposites even under an anaerobic atmosphere with water as the solvent. This is the first application of POM-based materials in the anaerobic oxidation of benzyl alcohol with concomitant H 2 production. This study expands the possibilities for designing multifunctional POM-based photocatalysts for economic and ecological photoredox applications.
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Advanced Sustainable Systems
·
2022
·Vol. 6
·期 5
·2100516
·
IF 6.737
Dawang Zhou,Li Wang,Fangzhou Zhang,Jing Wu,Huaping Wang,Jianping Yang
Fiber-based microplastic (FMP) pollution in the wastewater of the textile industry and urban sewage has become an emerging issue and a potential threat to marine life and human health. However, most reported reduction strategies, such as physical adsorption/filtration and chemical-catalytic degradation are limited by the secondary pollution caused by the desorption of FMPs and inferior degradation performance. Advanced technologies for efficient FMP control remain largely insufficient and underdeveloped. This work reports a Z-scheme Bi 2 O 3 @N-TiO 2 heterojunction synthesized by a solvothermal and wet-impregnation strategy. Bi 2 O 3 @N-TiO 2 degrades ≈10.23 ± 1.91 wt% of polyethylene terephthalate (PET)-FMPs (a major FMP existing in the environment) at pH = 9, which is nearly three times higher than that at pH = 7. Experimental results show that the hydrolysis of PET-FMPs in alkaline media is the main reason for the superior performance. Importantly, the hydrophilic, weight-average molecular weight and crystallinity of PET-FMP are the key factors affecting the photocatalytic degradation performance of PET-FMPs. This study demonstrates an eco-friendly strategy for remediation of FMP contamination.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 11
·5176-5187
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IF 3.925
Yuzhen Li,Shaojie Wang,Yunsheng Xia,Lizhen Gao
A series of Z-scheme CuSnO3/g-C3N4 heterojunctions were synthesized by a precipitation–calcination method. Morphological features, chemical composition, optical properties and crystallographic information of the prepared materials were obtained using scanning electron microscopy (SEM), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV–Vis diffuse reflection spectroscopy (UV-Vis DRS), and photoluminescence spectroscopy (PL). The as-fabricated catalysts assisted by H2O2 showed remarkably enhanced photocatalytic performance for the degradation of tetracycline (TC) under visible light irradiation. The 20 wt% CuSnO3/g-C3N4 composite exhibited the highest photocatalytic degradation activity, which could be up to 93.6% at 60 min for the degradation of TC under visible light irradiation. Reactive species scavenging experiments revealed that superoxide radicals were the main active species during the photocatalytic process. This work will be useful for the design of other direct Z-scheme photocatalytic systems for applications in energy conversion and environmental remediation.
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ADVANCED POWDER TECHNOLOGY
·
2023
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IF 5.2
Kai Wang,Xiaojiao Yu,Fan Yang,Zongbin Liu,Ting Zhang,Jinfen Niu,Binhua Yao
p–n heterojunction composites with high-charge-transfer efficiency have attracted considerable attention owing to their unique structure and interface interactions. Herein, a novel Z-scheme Cu 2 O/SrBi 4 Ti 4 O 15 p–n heterojunction was successfully constructed using the microwave hydrothermal method for DOC removal under visible light irradiation. The structure, composition, and photoelectric chemical properties of Cu 2 O/SrBi 4 Ti 4 O 15 nanocomposites were studied. The composites exhibited high photocatalytic activity for DOC, and 92.2% of DOC was decomposed within 60 min, which is 9.2 and 5.2 times higher than those of original Cu 2 O and SrBi 4 Ti 4 O 15 , respectively. The extraordinary degradation performance can be attributed to the formation of Z-scheme heterostructure. On the one hand, a unique interface structure can significantly enhance the number of active sites on the catalyst surface. On the other hand, Z-scheme heterostructure can accelerate generation and migration of the photoinduced carriers. Furthermore, the effects of operational parameters such as catalyst dosage, initial concentration, inorganic salts, and water sources, were investigated. Finally, a photodegradation mechanism of Z-scheme Cu 2 O/SrBi 4 Ti 4 O 15 p–n heterojunction for DOC was proposed.
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Catalysts
·
2023
·Vol. 13
·期 5
·817
·
IF 3.9
Haoyu Yuan,Chao Zhang,Wenjing Chen,Yuzhou Xia,Lu Chen,Renkun Huang,Ruiru Si,Ruowen Liang
Metal–organic frameworks (MOFs) are new porous materials composed of metal centers and organic ligand bridges, which received great attention in the field of photocatalysis. In this work, Ag2CrO4@MIL–125(Ti)–NH2(denoted as AgCr@M125) Z–scheme heterojunctions were synthesized via a simple microemulsion method, by which highly dispersed nano–sized Ag2CrO4can be anchored uniformly on the surfaces of porous MIL–125(Ti)–NH2(denoted as M125). Compared with pure M125 and Ag2CrO4, the as–prepared AgCr@M125 hybrids show significant photocatalytic efficiency against inactivatedStaphylococcus aureus(S. aureus), reaching over 97% inactivation of the bacteria after 15 min of visible light irradiation. Notably, the photocatalytic activity of the obtained 20%AgCr@M125 is about 1.75 times higher than that of AgCr–M125, which was prepared via a traditional precipitation method. The enhanced photocatalytic antibacterial activity of the AgCr@M125 photocatalytic system is strongly ascribed to a direct Z–scheme mechanism, which can be carefully discussed based on energy band positions and time–dependent electron spin response (ESR) experiments. Our work highlights a simple way to enhance the antibacterial effect by coupling with Ag2CrO4and M125 via a microemulsion–assisted strategy and affords an ideal example for developing MOFs–based Z–scheme photocatalysts with excellent photoactivity.Keywords:MIL–125(Ti)–NH2;Ag2CrO4;S. aureus;Z–scheme;microemulsion method
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