Journal of Water Process Engineering
·
2024
·
IF 6.3
Jingjing Ning,Zihan Kang,Ni Qin,Mengshi Chen,Jiang Wu,Dinghua Bao
The discharge of toxic pollutants and the abuse of antibiotics present significant risks to both global food safety and public health. The utilization of clean mechanical energy for catalytic degradation has been demonstrated as a promising approach to overcome prevalent obstacles. In this work, we employ the approach of manipulating carrier separation through interface engineering to boost the piezocatalytic performance of BiFeO 3 (BFO). Specifically, a Z -scheme heterojunction is established with BFO by utilizing energy band-matching Bi 2 S 3 (BS). In contrast to the pure BFO (1.49 × 10 −2 min −1 ) and BS (1.64 × 10 −2 min −1 ), the BFO/BS heterojunction demonstrates a notable enhancement in piezocatalytic performance, reaching 3.56 × 10 −2 min −1 . This enhancement is believed to be due to the presence of a polarization field facilitating band tilt and the construction of Z -scheme heterojunction. Following the implementation of light assistance, the piezocatalytic efficiency of BFO/BS is enhanced to a greater extent (6.07 × 10 −2 min −1 ), attributing to the enhanced separation of photogenerated carriers facilitated by the piezoelectric polarization field. This study not only demonstrates the potential of BFO/BS as a catalytic candidate material by multimodal renewable energy harvesting, but also offers insights for the strategy of enhancing catalytic activity through interface engineering.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 47
·22550-22560
·
IF 3.925
Lili Wang,Lei Chen,Mengyao Tang,Shoujie Jiang,Dawei Gao
A novel AgI/Ag6Si2O7/PET Z-scheme heterojunction photocatalyst with strong redox capability was fabricated via a facile successive ionic layer adsorption and reaction (SILAR) method to degrade methyl orange (MO). Compared with Ag6Si2O7/PET and AgI/PET, the prepared AgI/Ag6Si2O7/PET heterojunction exhibits superior photocatalytic performance under visible light because of its strong interfacial coupling effects. The degradation rate constant of the optimal AgI/Ag6Si2O7/PET is up to 0.144 min−1, which is approximately 5.5 and 9.6 times greater than that of Ag6Si2O7/PET and AgI/PET, respectively. The radical capture experiments and ESR characterization demonstrate that h+ and ˙O2− are two major oxidative species responsible for the photocatalytic degradation of dyes. The PL, photocurrent and EIS analyses indicate that AgI/Ag6Si2O7/PET shows enhanced electron–hole pair separation efficiency. This phenomenon is related to three aspects, namely the high light-harvesting efficiency, greatly enhanced accessibility to the active site, and the formation of Z-scheme heterojunction structures that effectively improve the photoelectron–hole separation efficiency and the redox capacity of the photocatalyst. Our work, therefore, provides novel insights into the development of a heterojunction composite with boosted photocatalytic activity, excellent stability, and reusability for the degradation of organic pollutants.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Changdi Wang,Tingting Ji,Wenqian Luan,Dong Yao,Ruiyang Zhao,Jishu Han,Lei Wang
The high efficient utilization of light absorption and the effective separation of photogenerated carriers are critical factors in enhancing the performance of photocatalysts. In this study, CoNi-layered double hydroxide was synthesized using zeolitic imidazolate frameworks-67 as a template, followed by calcination to form CoS 2 /NiS 2 . Subsequently, ReS 2 was deposited onto the surface of CoS 2 /NiS 2 , resulting in the ReS 2 /CoS 2 /NiS 2 photocatalyst demonstrated notable hydrogen evolution activity under visible light, achieving a maximum hydrogen production rate of 40111.8 μmol/g. The construction of the Z-scheme heterojunction was found to facilitate the transfer and separation of photogenerated carriers while extending the lifetime of photogenerated electrons, thereby contributing to the enhancement of photocatalytic activity. This study provides a new approach for the development of sulfide heterojunctions aimed at improving photocatalytic hydrogen production efficiency.
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
PubMed
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Yuyang Wang,Chun Cai
It is a promising endeavor to explore the photocatalytic oxidation for 5-hydroxymethylfurfural (HMF) to produce high-value-added derivatives. The absence of efficient photocatalytic systems has hindered the transformation of HMF to 2,5-diformylfuran (DFF), while DFF is susceptible to subsequent oxidation into 2,5-furandicarboxylic acid (FDCA). Herein, we design a Z-scheme heterojunction photocatalyst α-Fe2O3/Zn0.5Cd0.5S via hydrothermal methods, which exhibits superior activity toward the selective oxidation of HMF to DFF or FDCA in aqueous solution. Photocatalytic investigations demonstrated the highest activity for 15% Fe2O3/Zn0.5Cd0.5S, resulting in a DFF selectivity of 99% and conversion of 75%, affording FDCA selectivity of 85% and conversion of 99%. The high catalytic activity has been ascribed to the effective separation of photogenerated charge carriers and generation of reactive oxygen species (ROS) in different atmospheres with the Z-scheme mechanism. Research revealed that the oxidation to DFF is associated with •OH in an Ar environment, while the generation of FDCA is related to •O2– in the air. Moreover, selective oxidation may also exhibit significant potential for the utilization of sunlight and other benzene substrates. Overall, this study offers a unique demonstration of designing a noble metal-free Z-scheme heterojunction photocatalyst for the oxidation of HMF to selective products in water.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Yanxian Geng,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Heterojunctions have attracted considerable attention for efficiently utilizing solar energy and improving conversion efficiency during pollutant degradation. Herein, carbon nitride and hematite (α-Fe 2 O 3 ) are used to prepare a Z-scheme 2D/2D α-Fe 2 O 3 /g-C 3 N 4 heterojunction using an impregnation-hydrothermal method. The unique 2D/2D structure has a high interfacial area and widely-dispersed active sites. The energy band structure of the Z-scheme heterojunction leads to broad visible-light absorption and promotes charge transfer. Optimizing the content of the α-Fe 2 O 3 precursor in composite leads to a maximum efficiency of 60.8% for the removal of 600 ppb of NO , which is approximately 1.78 times that of g-C 3 N 4 (34.2%). The photocatalytic performance is greatly promoted because of the formation of the heterojunction and the strong interfacial action between g-C 3 N 4 nanosheets and α-Fe 2 O 3 nanoplates. Cycling experiments verify that the α-Fe 2 O 3 /g-C 3 N 4 heterojunction has good stability and reusability. The α-Fe 2 O 3 /g-C 3 N 4 heterojunction therefore has great potential in sustainable and efficient pollutant degradation.
研究领域:
环境催化
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材料科学
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物理化学
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纳米科技
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光化学
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DOI
高影响因子
Nano Research
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2024
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IF 9.5
Shen Huidong,Yang Chunming,Hong Song,Hao Leiduan,Xu Liang,Robertson Alex W.,Sun Zhenyu
Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental issues. Nevertheless, the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge separation. Here we design and fabricate a heterojunction consisting of copper, carbon-modified TiO 2 , and sulfur-doped g-C 3 N 4 nanosheets (i.e., S-C 3 N 4 /Cu/C-TiO 2 ). The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation, achieving an 82.6% removal efficiency within 30 min under visible light irradiation, about 15.4 and 7.3 times higher than that of S-C 3 N 4 and C-TiO 2 , respectively. The superior performance is attributed to the synergy between Cu doping and the Z-scheme heterojunction, which not only enhances the interfacial electric field effect, facilitating charge separation, but also boosts the redox capability. The charge carrier transfer between Cu/C-TiO 2 and S-C 3 N 4 follows a Z-scheme, as verified by trapping experiments, electron spin-resonance spectroscopy, and density functional theory calculations. Furthermore, the tetracycline hydrochloride degradation pathways are enunciated by liquid chromatograph mass spectrometry analysis. This work provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.
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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化学工程
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产品关联
DOI
高影响因子
ChemSusChem
·
2025
·Vol. 18
·期 11
·e202402588
·
IF 6.6
Shengnan Duan,Teng Gu,Chiasa Uragami,Shin-ichi Sasaki,Yuanqi Zhou,Ruohan Tao,Xianju Zhou,Chunbao Feng,Hitoshi Tamiaki,Xiao-Feng Wang,Zeyun Xiao,Hideki Hashimoto
Graphical A layered cascade bio-solar cell inspired by artificial photosynthesis is constructed using chlorophyll (Chl) and bacteriochlorophyll derivatives (BChl) to emulate PSI and PSII, respectively. Sub-ns TAS reveals a prolonged charge transfer state from BChl to Chl (Chl – /BChl + ), compared to the reverse (Chl + /BChl – ). This confirms the biomimetic device effectively replicates the natural photosynthetic electron transfer mechanism. The natural Z-scheme of oxygenic photosynthesis efficiently drives electron transfer from photosystem II (PSII) to photosystem I (PSI) via an electron transport chain, despite the lower energy levels of PSII. Inspired by this sophisticated mechanism, we present a layered cascade bio-solar cell (CBSC) that emulates the Z-scheme. In this design, chlorophyll derivatives (Chl) act as PSI analogs, while bacteriochlorophyll derivatives (BChl) serve as PSII analogs in the active layer. The resulting photocurrent, prominently detected in the near-infrared region, is validated through external quantum efficiency measurements. Sub-nanosecond transient absorption spectroscopy reveals a prolonged charge transfer (CT) state from BChl to Chl (Chl – /BChl + species) compared to the reverse direction (Chl + /BChl – species). This asymmetry highlights a dominant electron flow from BChl (PSII analog) to Chl (PSI analog) under simultaneous excitation, effectively replicating the natural Z-scheme electron transfer. These findings represent a significant advance in the design of bio-inspired solar cells, paving the way for artificial photosynthesis systems and offering profound insights into improving photovoltaic theory and efficiency.
研究领域:
生物化学
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光合作用
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Xiaoqing Wang,Cong Du,Yue Yu,Weiyi Li,Tuo Li,Siyuan Wang,Shanjun Mao,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
Given the crucial impact of lattice matching on the charge-transfer efficiency and overall catalytic activity in heterojunctions, we pre-designed an α-Bi 2 O 3 /Co 3 O 4 photocatalytic system with high lattice matching to reduce dangling bonds and lattice mismatches in heterojunctions (A-axis: 2.77 %, B-axis: 0.86 %). The α-Bi 2 O 3 /Co 3 O 4 heterojunction was synthesized using a coprecipitation strategy and showed a wide optical absorption range, with enhanced absorption beyond 420 nm, and ideal photoelectrochemical responses (the highest current intensity: 0.26 μA (cm 2 ) −1 ). Under simulated sunlight irradiation, the heterojunction removed 97.30 % and 85.32 % of methylene blue and tetracycline, respectively, within 120 min. The degradation was corroborated by total organic carbon removal efficiencies, with methylene blue achieving 92.51 % and tetracycline 87.33 % within 120 min, indicative of the effective mineralization process. Our density functional theory calculations indicated that α-Bi 2 O 3 and Co 3 O 4 generated an internal electric field during the Fermi equilibrium process, which caused the conduction band electrons of α-Bi 2 O 3 to flow towards the valence band of Co 3 O 4 , forming a Z-scheme electron flow. Electrons and holes could be separated and transported in heterojunctions with low interface resistance and then react with dissolved oxygen to generate highly active OH and O 2 − radicals, which induced the efficient degradation of organic pollutants. We explored the key influence of structure on catalytic activity on lattice matching and analyzed the catalytic mechanism of α-Bi 2 O 3 /Co 3 O 4 heterojunctions in terms of charge properties. Our findings should serve as a crucial reference for developing excellent structured photocatalytic materials.
研究领域:
材料科学
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环境科学
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计算化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
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 Water Process Engineering
·
2024
·
IF 6.3
Bingkun Liu,Ruoyu Li,Beibei Liu,Guanghui Wang,Jiayu Sun,Hongda Huang,Hengzhen Shi,Jingtao Zhang
Z-scheme WO 3 /AgI heterojunctions on carbon fiber (CF) cloth were fabricated through in-situ hydrothermal method and chemical bath deposition route. The CF@WO 3 /AgI cloth achieved highly efficient photocatalytic abilities under visible light , which could eliminate 95.7 % of Rhodamine B (RhB) in 70 min and 70.0 % of tetracycline hydrochloride (TC-HCl) in 110 min, superior to those of CF, CF@WO 3 and CF@AgI cloths. Moreover, the catalyst was able to achieve 7.0 ± 0.16 log 10 CFU/mL reduction of E. coli cells within 40 min. Recycling test confirmed the repeatability and stability of CF@WO 3 /AgI cloth. The enhanced photocatalytic performance was attributed to the increased visible light utilization, accelerated charge carriers separation and high photo-redox capabilities which came from the formation of Z-scheme heterojunction. This work provided inspiration for the construction of high-efficiency flexible photocatalysts for environmental decontamination .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 58
·46897-46903
·
IF 3.84
Yi Zheng,Gang Chen,Yaoguang Yu,Jingxue Sun,Yansong Zhou,Fang He
The first example of an all tungsten based Z-scheme photocatalyst (composed of WO3·0.33H2O and PbWO4) has been synthesized via an ion exchange method. The composites exhibit much higher photocatalytic activities than those of individual hydrated tungsten trioxide and lead tungstate. The apparent photodegradation rate constants of RhB over the composites are more than 6 to 8 times higher than those of the two monomer components. After 30 min, the RhB can be removed almost completely by the composite, while only 30% RhB and 35% RhB can be, respectively, eliminated for the two single components. In addition, the composite photocatalyst displays excellent activity in the photodegradation of methyl orange (MO). The relationship between the two monomer components has been investigated using XRD, Raman, XPS, SEM, and TEM measurements. The hydrated tungsten trioxide is formed on the surface of lead tungstate via a complex process that includes ion exchange and crystal structure rearrangement. Ion exchange occurs at the end of the (110) facet of lead tungstate. The results of photocatalytic mechanism and photodeposition Pt experiments indicate that the excellent photocatalytic activity of the composite photocatalyst is due to the advantage of its Z-scheme configuration. This study suggests that highly effective Z-scheme photocatalysts can be built by ion exchange.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 5
·118305
·
IF 7.2
Qian Xie,Zhengxin Cai,Yuxuan Wang,Jiajia Cai,Jianmin Wang,Shineng Sun
Photoelectrochemical cathodic protection (PCP) driven by solar energy represents a promising alternative to conventional corrosion protection methods. However, severe photocarrier recombination within the photoanode remains a major obstacle limiting PCP efficiency. Herein, a Z-scheme heterojunction composed of 3D TiO 2 nanotube arrays (T) and 2D ZnIn 2 S 4 (ZIS) nanoflowers was rationally constructed for the controllable growth and effective application in the PCP of Q235 steel. Benefiting from the Z-scheme charge transfer pathway, intimated interfacial contact, and broad UV–visible light absorption capability, the T/ZIS heterojunction exhibited significantly enhanced charge separation and transport efficiency. In the optimized configuration, the open-circuit potential under illumination (OCP L ) of T/ZIS-5 coupled with Q235 reached −1.07 V vs. SCE, accompanied by a photocurrent density of 240 μA/cm 2 , over 6-fold higher than that of bare T and superior to other reported photoanodes under similar conditions. This work highlights the important role of electrode design and interface engineering in optimizing PCP performance and provides valuable insights for the development of high-performance heterojunction-based photoelectrodes for solar-driven corrosion protection in marine environments.
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DOI
高影响因子
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