APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jie Ding,Zan Dai,Fan Qin,Huiping Zhao,Shuai Zhao,Rong Chen
To solve serious energy and environmental crises caused by rapid industrial development, Z-scheme photocatalytic system provides a potential strategy to as ideal photocatalyst with wide absorption range, high charge-separation efficiency and strong redox ability. In this work, we develop a facile time-dependent method to fabricate Z-scheme BiO 1-x Br/Bi 2 O 2 CO 3 photocatalyst with rich oxygen vacancies for visible light photocatalysis , which exhibits highly enhanced performance for antibiotics (CIP, 4-MAA etc.) photodegradation . A possible mechanism of the improved photocatalytic efficiency based on the Z-scheme photocatalytic system formed via oxygen vacancy is also proposed. Oxygen vacancies, acting as electron mediator, could significantly promote the separation of photoinduced charge carriers. Due to the increase of redox ability, it benefits to the production of superoxide radical ( O 2 − ) on the CB of BiO 1-x Br and hydroxyl radical ( OH) on the VB of Bi 2 O 2 CO 3 , respectively. This work demonstrates that a simple oxygen vacancy involved Z-scheme photocatalytic system could efficiently enhance the photocatalytic activity for the degradation of pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22297-22311
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IF 2.22
Guan Yiyin,Liu Wenjie,Zuo Shixiang,Yuan Kun,Wu Fengqin,Ji Jinjin,Yao Chao
In this paper, rutile phase titanium oxide/Sb-SnO 2 /anatase phase titanium oxide (TiO 2 (R)/C-TiO 2 (A)) heterostructured nanocomposites were prepared by a sol–gel method and a hydrothermal method. By optimizing the mass ratio between TiO 2 (R) and C-TiO 2 (A), the rod-ball heterostructures of TiO 2 (R)/C-TiO 2 (A) were formed and exhibited enhanced simulated sunlight-driven photocatalytic desulfurization performance. According to the results, the desulfurization rate of TiO 2 (R)/C-TiO 2 (A) was 93.98% after 60 min, which is higher than C-TiO 2 (A) and TiO 2 (R)/TiO 2 (A). In addition, the photocatalytic recyclability test indicated that after three times the reuse of TiO 2 (R)/C-TiO 2 (A) could still reach 85.98%. The enhanced photocatalytic performance could be attributed to the double Z-scheme heterojunction in the TiO 2 (R)/C-TiO 2 (A) and the uniformly structure of rod array, which resulted in the higher separation efficiency of electrons and holes. Furthermore, the results of photocatalytic active radical species trapping experiments showed that the main substances in the photocatalytic reaction are ∙O 2 − and h + . This paper also established the double Z-scheme heterojunction reaction mechanism.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
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2022
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IF 8.008
Jiaxi Hu,Hongjie Song,Cheng Chen,Lichun Zhang,Mingxia Sun,Yi Lv
Cataluminescence as a highly efficient gas transduction principle has attracted wide attention among research in environmental monitoring and clinical diagnosis with increasing awareness of human safety. Nowadays, the development of innovation sensing systems and the construction of the sensing mechanism to improve the analytical performance of compounds remain a major challenge. Herein, we construct an advanced photoinduced thermocatalytic chemiluminescence (PI-TC-CL) gas-sensing system via the introduction of a Z-scheme heterojunction Ag3PO4/Ag/Bi4Ti3O12 to achieve higher efficient detection of H2S. The unique electron transport path of the Z-scheme heterojunction and the LSPR effect of Ag nanoparticles fascinate the generation of the photoinduced electron–hole pair on the surface of catalysts when stimulated by LED lamps and slow down the recombination of electron–hole pairs under thermal conditions. Thus, based on the cooperative effect of the Z-scheme heterojunction AgPO/Ag/BTO and PI-TC-CL system, we have successfully established an efficient H2S CTL detection system, which has a response three times higher than that on the traditional CTL system and even 45 times higher than that on BTO and ranges among the best of the state-of-the-art CTL performance in H2S detection with the linear range of 0.095–8.87 μg mL–1 and a limit of detection of 0.0065 μg mL–1. Besides, to explore the gas-sensing mechanism, the synergetic effects of photoinduction and thermal catalysis are investigated thoroughly via conductivity and electrochemical experiments. This research provides a new perspective of engineering highly efficient catalysts and ingenious sensor systems through designing the nanostructure of materials and synergism catalytic mechanism.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Jie Hu,Xiuwu Xu,Xin Wei,Maobin Xiao,Weiran Wu,Zhaoyu Wang,Lele Wang,Qinqin Liu
Developing artificial photosynthetic system with high activity is significant for long-term solar light conversion. Inspired by the natural Z-scheme photosystem, a ternary core-shell ZnIn 2 S 4 /MoO 3 /MoS 2 (ZOS) composite with double Z-scheme junction was prepared by in-situ vulcanization of MoO 3 nanosheets . Such in-situ formed intimate interfaces can overcome the high interfacial charge transfer barrier between different composites thus boosting the charge separation efficiency. The dual Z-scheme heterojunction provided dual electron transfer routes and favored the charge transfer. In addition, the ternary core-shell structure offered more spatially separated active sites which also increased the photocatalytic activity. Profiting from these strategies, the optimized ZOS-1 sample afforded 3.71 mmol·g −1 ·h −1 hydrogen evolution rate at 420 nm, which was 18.5 and 2.5 times higher than that of MoO 3 and ZnIn 2 S 4 , respectively. In addition, 88% tetracycline can be eliminated in the solution within 70 min in the presence of ZOS-1 sample. This study provides an effective strategy for designing high-efficiency artificial photosynthetic systems under Z-scheme charge transfer routes in photocatalytic reactions.
研究领域:
材料科学
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光合作用工程
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环境科学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Yujie Zhang,Zexin Cui,Rongfang Yuan,Huilun Chen,Beihai Zhou
As the persistent contamination of water sources with antibiotics poses a growing environmental challenge, effective strategies for the degradation of such pollutants are urgently needed. Herein, a novel organic-inorganic Z-scheme heterojunction material, reduced Graphene Oxide (rGO)@PANI/SnO 2 , was prepared for the photocatalytic degradation of sulfadiazine (SD). When the PANI/SnO 2 with PANI doping amount of 1% was loaded on 1% rGO, the catalyst showed the best photocatalytic activity, with a reaction rate constant of 0.184 h -1 , which was 32.8 and 7.19 times higher than that of PANI and SnO 2 , respectively. The improved photocatalytic activity was mainly due to the high electrical conductivity of rGO and the formation of a Z-scheme heterojunction between PANI and SnO 2 , which effectively facilitated the transfer of photogenerated carriers. Quenching experiments showed that ·OH is the main active species. Besides, Density Functional Theory (DFT) calculations found that the sulfonamide bond and pyrimidine heterocyclic were vulnerable site in the SD. Then, four possible degradation pathways were proposed, primarily involving the breaking of the sulfonamide bond and the ring-opening of the pyrimidine heterocycle. The response surface method (RSM) was used to confirm that the removal of SD was affected by the single factor of initial SD concentration, pH value and catalyst dosage, and the magnitude of the effect of different parameters was in the order of pH > catalyst dosage > SD concentration. It was found that Cl - and SO 4 2- inhibited the photocatalytic process, whereas HCO 3 - facilitated the process through its ability to produce ·OH by hydrolysis and provide a weakly alkaline environment. This work provides novel ideas for the preparation of organic-inorganic heterojunction photocatalysts and enhances the application of organic materials in the photocatalytic degradation of antibiotics in water.
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
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Qiuling Chen,Shun Wang,Baoji Miao,Qiuping Chen
The creation of a Z-scheme heterojunction is a sophisticated strategy to enhance photocatalytic efficiency. In our study, we synthesized an In 2 S 3 /MnO 2 /BiOCl dual Z-scheme heterostructure by growing BiOCl nanoplates on the sheets of In 2 S 3 nanoflowers, situated on the surface of MnO 2 nanowires. This synthesis involved a combination of hydrothermal and solution combustion methods. Experiments and density functional theory (DFT) calculations demonstrated that the In 2 S 3 /MnO 2 /BiOCl composite exhibited notable photo reduction performance and photocatalytic stability. This was attributed to the pivotal roles of BiOCl and MnO 2 in the composite, acting as auxiliaries to enhance the electronic structure and facilitate the adsorption/activation capacity of CO 2 and H 2 O. The yield rates of CO, CH 4 , and C 2 H 4 over In 2 S 3 /MnO 2 /BiOCl as the catalyst were 3.94, 5.5, and 3.64 times higher than those of pure In 2 S 3 , respectively. Photoelectrochemical analysis revealed that the dual Z-scheme heterostructure, with its oxygen vacancies and large surface area, enhanced CO 2 absorption and active sites on the nanoflower/nanowire intersurfaces. Consequently, the dual Z-scheme charge transfer pathway provided efficient channels for boosting electron transfer and charge separation, resulting in high C 2 H 4 , CH 4 , and CO yields of formed and exihibits an promising photoreduction rate of CO 2 to CO (51.2 µmol/g.h), CH 4 (42.4 µmol/g.h) and C 2 H 4 (63.2 µmol/g.h), respectively. DFT, in situ Diffuse reflectance infrared fourier transform spectroscopy, and temperature-programmed desorption tests were employed to verify the intermediates pathway. The study proposed a potential photocatalytic mechanism based on these findings.
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
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Decai Yang,Qing Ye,Chao Qu,Fanwei Meng,Lanyang Wang,Yongqi Li
In the quest to enhance photocatalytic performance, structural regulation and interface engineering stand out as effective strategies for amplifying active sites and fostering the separation of photogenerated electron-hole pairs. In this study, a pioneering approach was employed, utilizing a straightforward two-step calcination method to prepare a novel photocatalyst : porous graphite carbon nitride (g-C 3 N 4 , CN) nanosheets (NS) loaded with mesoporous cerium oxide (CeO 2 /CNNS). The distinctive architecture of CeO 2 /CNNS not only elevates the specific surface area and catalytic active sites but also facilitates efficient mass transfer. Experimental results and density functional theory (DFT) calculations corroborate the existence of an internal electric field (IEF) within the Z-scheme heterojunction formed by uniformly dispersed CeO 2 and CNNS. This IEF proves pivotal in promoting charge separation and migration, thereby maintaining robust redox capabilities. Under visible light irradiation, CeO 2 /CNNS demonstrates an impressive 4.2-fold increase in the hydrogen production rate compared to bulk g-C 3 N 4 (BCN), coupled with a 48.5% boost in the photocatalytic degradation rate constant (k) of tetracycline (TC). This study not only unveils the innovative design of CeO 2 /CNNS but also paves the way for a fresh perspective on the design and preparation of multifunctional photocatalysts.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Dongfang Hou,Qian Zhu,Junjie Wang,Min Deng,Xiu-qing Qiao,Bojing Sun,Qingwen Han,Ruan Chi,Dong-Sheng Li
Optimized fabrication of Z-scheme photocatalyst based on MOF materials offers sustainable energy generation and environmental improvement due to their attractive properties. The Z-scheme heterojunctions consisting of UiO-66 cubes covered with Zn 0.5 Cd 0.5 S nanoparticles were fabricated by a facile solvothermal method. Thanks to the Z-scheme carrier transport under simulated sunlight irradiation, UiO-66@Zn 0.5 Cd 0.5 S exhibited enhanced photocatalytic performance of H 2 generation synchronized with organic pollutant degradation in fluoroquinolone antibiotic wastewater. Synergistically, the highest comprehensive performance was obtained in ciprofloxacin solution. The H 2 yield reached 224 μmol∙ g −1 ∙ h −1 and simultaneously the removal efficiency was up to 83.6 %. The degradation pathways revealed that the process of piperazine ring cleavage and decarboxylation also generates H protons, further promoting the production of H 2 . Therefore, the effective spatial separation and transfer of the photoinduced carriers are attributed to the good band structure, large specific surface area, and cooperative reduction and oxidation reactions of UiO-66@Zn 0.5 Cd 0.5 S, resulting in significant photocatalytic activity. The toxicity assessment of antibiotics and intermediate products during the photocatalytic reaction also verifies the reduction of environmental risk. This study highlights a promising way to expand the application of the MOFs-based photocatalyst in clean energy conversion coupling with water remediation.
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
PubMed
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Dong Yuqi,Qiao Qing-an,Wang Ruping,Yang Yueyue,Cai Honglan,Gao Hongwei
Environmental pollution caused by industrial waste is an increasing concern, and the design and development of efficient photocatalysts offer promising approaches to address this issue. A series of novel Zn 0.6 Cd 0.4 S/ZnO/g-C 3 N 4 composites were prepared through a calcination‒hydrothermal method. Under visible light, these materials demonstrated exceptional performance in the photodegradation of methylene blue (MB), rhodamine B (RhB), and tetracycline (TC). Among the composite materials, Z 0.6 C 0.4 S/ZnO/CN-35% exhibited the highest degradation efficiencies for MB (98.52%), RhB (99.45%), and TC (98.20%), demonstrating excellent reusability as well. The photocatalytic performance of the catalysts was assessed across various water sources and different pH conditions. The findings revealed that the degradation efficiency for contaminants in seawater, lake water, and tap water closely mirrored that observed in deionized water, suggesting wide adaptability among different aqueous solutions. The exceptional photocatalytic performance of the composite materials can be attributed primarily to the efficient separation and migration of holes (h + ) and electrons (e − ) via well-contacted interfaces. Free radical capture experiments confirmed that hydroxyl radicals (·OH) and superoxide ion radicals (·O 2 - ) play crucial roles in the reaction process. The photocatalytic mechanism was also revealed via density functional theory (DFT) calculations. This work introduced an innovative strategy to design and fabricate novel photocatalysts, emphasizing their extensive applications from both theoretical and experimental aspects.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaofang Feng,Runxuan Long,Chenchen Liu,Ying Lu,Xiaobo Liu
This study fabricated PENS/TA/ZIF-67@Ag 2 S (PZA), a double self-cleaning network antifouling polymer membrane reactor, by the non-solvent-induced phase separation (NIPS) method. Due to the synergistic effect of the double self-cleaning structure, it showed an excellent separation efficiency of 99.65% and a high flux of 1198.011 L·m −2 ·h −1 in the separation of oil-in-water emulsion experiments. After eight cycles, Oil-water separation efficiency remains >99% recyclable. The Z-type heterogeneous conjunctival reactor we constructed has a high-efficiency degradation rate of 99.94% and a mineralization rate of 80.315% for sulfamethoxazole (SMX) within 120 min. From the results of mechanical properties, TGA and DSC, it can be seen that PZA has good strength, toughness and high temperature resistance. According to the experimental analysis of active substances, the active ingredients produced by PZA are •OH., h + , •O 2 – . Based on Density functional theory (DFT) calculations and intermediate analysis, sulfamethoxazole's active sites and degradation pathways (SMX) were explored. According to the Quantitative Structure-Activity Relationship (QSAR) of the Toxicity Estimation Software Tool (TEST), the toxicity of the intermediates produced during the degradation of SMX was predicted. This study provides a feasible strategy for fabricating Z-scheme metal-organic framework (MOF)-based polymer membrane reactors for efficient green antibiotic wastewater treatment and oil-water self-cleaning.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Chenglong Liu,Jiacheng Jin,Fan Dong,Zhipeng Zhang,Daolin Zhou,Mingxin Jin,Haohao Wan,Min Shao,Yushan Wan
This article aims at preparing of Z-scheme heterojunction NiCo-LDH/Bi 2 WO 6 (LDH: layered double hydroxides) via a solvothermal technique, addressing the rapid recombination of electron-hole pairs caused by the narrow bandgap of Bi 2 WO 6 . Successful loading of NiCo-LDH onto Bi 2 WO 6 was confirmed through various characterization techniques, assessing the composite's crystal structure, morphological traits, and performance. Notably, the NiCo-LDH/Bi 2 WO 6 composite exhibited excellent photocatalytic performance in the degradation of tetracycline (TC), achieving an optimal reaction rate of 0.03 min −1 , which is 4.8 times faster than that of Bi 2 WO 6 alone. The findings demonstrate that the formation of the heterojunction structure facilitated the separation of photogenerated electron-hole pairs by reducing recombination in monomers. Free radical trapping experiments showcased that the decomposition of TC is primarily driven by h + and ∙O 2 − . Additionally, liquid chromatography-mass spectrometry analysis identified the degradation products of TC and suggested two potential degradation pathways. The present research provides a novel approach for preparing LDH photocatalytic materials using NiCo-LDH/Bi 2 WO 6 .
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
高影响因子
危险品化学品经营许可证（带存储）