CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Yu Liu,Tianyi Hu,Shufei He,Likui Feng,Qingliang Zhao,Junqiu Jiang,Liangliang Wei
Inspired by the high sustainability, energy saving, cleanliness of photocatalysis (PC) with respect to antibiotics decomposition, we developed a stable, highly efficient Bi 2 Ti 2 O 7 @Bi 2 S 3 /polyurethane (BTO@Bi 2 S 3 /PU) photocatalytic system. It exhibited the best degradation performance with the removal of 82.08 % oxytetracycline (OTC) within 180 min under the optimal reaction parameters. Systematic characterization of BTO@Bi 2 S 3 /PU revealed its wider light-harvest capacity, higher electron–hole (e − –h + ) separation efficiency, lower interface resistance, and better redox potential in heterojunction. Based on electrochemical characterization and density functional theory calculation, the construction of Z-scheme BTO@Bi 2 S 3 photocatalyst substantially optimized the band structure. Moreover, the redox cycles of Bi 3+ /Bi 5+ and Ti 4+ /Ti 3+ further enhanced the charge transfer rate during the photoactivation process. For the OTC photodegradation pathways, ·OH, h + , ·O 2 − , and 1 O 2 dominated the pollutant decomposition and the toxicity of intermediates were decreased. Overall, the BTO@Bi 2 S 3 /PU photocatalytic system may provide a universal and stable technique for advanced photoheterojunction applications and wastewater purification.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
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IF 14.229
Jinhong Zhang,Jincheng Liu,Xiaoyu Wang,Jijin Mai,Wei Zhao,Zhongxiang Ding,Yanxiong Fang
The novel Z-scheme WO 3 nanosheets-carbon dots (CDs) composites were prepared by assembling carbon dots with different terminal groups of amine groups and carboxylic acid groups on the surface of WO 3 nanosheets. Their microtopography, structural composition, optical and electrochemical properties are further compared. The lower fluorescence intensity and interfacial resistance of WO 3 -N-doped carbon dots (NCDs) composites indicate the efficient electron transfer between the two semiconductors. The WO 3 -NCDs composites show the significantly improved photothermal catalysis activity of cyclohexane oxidation with the highest conversion of 7.88% and selectivity to KA oil of 98.9%. This performance is 1.2 times that of WO 3 -carbon dots with the carboxyl groups (CCDs) composites and 1.5 times that of pure WO 3 nanosheets. The significantly increased catalytic performance was caused by the effective Z-scheme charge transfer between NCDs and WO 3 , and the accelerated chain initiation of cyclohexane oxidation by the photothermal synergistic catalysis.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Siyuan Wang,Shuda Liu,Shuyun Meng,Yuqing Li,Na Dong,Zuo Chen,Wenjia Li,Dong Liu,Tianyan You
Microcystin-LR (MC-LR), a toxic cyanotoxin, poses severe risks to environmental and human health with its efficient detection urgently required for water safety monitoring. Here, we reported a photoelectrochemical (PEC)-surface-enhanced Raman scattering (SERS) dual-mode aptasensor based on WS 2 /copper(II) meso-tetra(4-carboxyphenyl) porphyrin (WS₂/Cu-TCPP) MOFs Z-scheme heterojunction with a single laser source to produce photocurrent and SERS signals. To access interference between PEC and SERS signals, their correlation was systematically examined by applying a certain bias voltage. This bias voltage drives photogenerated electrons into external circuit, thereby enhancing carrier separation efficiency and suppressing the return of Raman photons to the ground state. In this way, a complementary “PEC-enhancement/SERS-attenuation” signal pattern can be achieved to allow better reliability for biosensing. The presence of ascorbic acid (AA) replicated an identical response to confirm competitive coupling between PEC and SERS derived from WS₂/Cu-TCPP heterojunction. Based on this signal transduction mechanism and localized generated AA by magnetic separation, a dual-mode aptasensor was developed for MC-LR detection with superior sensitivity and interference resistance. It allowed a linear range of 0.01–50 ng mL −1 and a detection limit of 0.14 pg mL −1 for MC-LR as well as high selectivity and stability for real water samples analysis. This work should offer an efficient paradigm for precise analysis of hazardous pollutants in complex matrices.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
·
IF 4.3
Jin Chen,Suqing Qin,Xiaofeng Yang,Yueying Wang,Tai Yang,Meidan Que,Yuzhao Ma,Yanjun Li
BiOBr can effectively mitigate the ecological and environmental problems caused by pollution with antibiotics, and its photocatalytic properties can be improved by utilizing heterojunction structures and cocatalysts. In this study, the Z-scheme heterojunction ternary photocatalyst BiOBr/g-C 3 N 4 /CQDs (BCC x ) was obtained by using an uncomplicated electrostatic self-assembly process. The incorporation of carbon quantum dots (CQDs) with high conductivity provided a conduit for charge transfer between g-C 3 N 4 and BiOBr. The loading density of CQDs on BiOBr/g-C 3 N 4 could be rapidly adjusted by changing the concentration of the CQDs precursor in solution. The presence of CQDs enhanced the absorption of visible light and inhibited the synthesis of photogenerated charge carriers, thereby resulting in a synergistic effect on the Z-scheme heterojunction and improving the photocatalytic properties under visible light. In particular, BCC50 had the highest catalytic performance, with a tetracycline pollutant degradation efficiency of 100% within 60 min. The degradation efficiency remained above 95% even after repeated use in five cycles. The principles of semiconductor energy bands and internal electrostatic field generation are applied to explain the photocatalytic mechanism responsible for tetracycline degradation using BiOBr/g-C 3 N 4 /CQDs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
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IF 3.375
Hu Wang,Bingxia Wu,Yuan Cai,Chengwei Zhou,Nengjie Feng,Geng Liu,Chong Chen,Hui Wan,Lei Wang,Guofeng Guan
The core–shell-structured Co–Z@TiO2(N2+O2) catalyst, which was prepared by subsequent pyrolysis and calcination from precursor ZIF-67 coated by amorphous TiO2, was applied in Fischer–Tropsch synthesis (FTS). Compared with Co–Z@TiO2 catalyst, which was directly calcinated in air (Co–Z@TiO2(O2)) or pyrolyzed in N2 (Co–Z@TiO2(N2)), the Co–Z@TiO2(N2+O2) catalyst showed better dispersion, easier reducibility, and optimal metal cobalt particle size (8.4 nm) due to the intermediate pyrolysis treatment and core–shell structure. The Co–Z@TiO2(N2+O2) catalyst exhibited high cobalt time yield (14.84 μmolCO·gCo–1·s–1), high selectivity to C5+ (81.5%), and low selectivity to low carbon hydrocarbon (CH4 (12.7%) and C2–C4 (5.8%)). The core–shell structure could enhance diffusion limitations to transform intermediate products into heavier hydrocarbons. After 110 h of evaluation, the Co–Z@TiO2(N2+O2) catalyst still maintained good catalytic performance and cobalt particle size distribution.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 13
·期 6
·120289
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IF 7.2
Tiantian Zhang,Weilu Sun,Jiazhuang Chen,Jianxin Chen,Yinhui Li
The misuse of tetracycline (TC) harms ecosystems and human health. CeO 2 , with its stable structure and abundant oxygen vacancies (OVs), is a focus for TC photocatalytic degradation but suffers from high carrier recombination, poor visible light absorption, and nanoparticle agglomeration. In this study, to overcome the drawbacks of CeO 2 mentioned above, PVP-modified SrTiO 3 (STO) was used as the support, PVP efficiently captures the precursor Ce 3 + by taking advantage of its network structure. And a layer of ultrafine nanoparticles CeO 2 was uniformly loaded on its surface by hydrothermal synthesis to form a core-shell structure composite material CeO 2 @STO, effectively solving the problem of CeO 2 nanoparticle agglomeration. A large specific surface area and sufficient active sites have been obtained, which enables CeO 2 to fully exert its catalytic degradation ability. The TC removal rate of the composite material CeO 2 @STO-2 was 80.50 %, which was 1.5 times and 2.5 times that of CeO 2 and STO respectively, and still maintained a high TC removal rate after 5 cycles, with only a decrease of 10.03 %. Furthermore, for tetracycline antibiotics such as chloramphenicol (CTC) and oxytetracycline (OTC), the removal rates were as high as 85.60 % and 78.60 %, which were significantly higher than those of CeO 2 and STO. The enhanced catalytic performance is attributed to the broadened visible-light absorption of composites, a Z-scheme heterostructure that suppresses carrier recombination, and interfacial doping that enriches oxygen vacancies. Toxicity simulations and bean sprout experiments confirmed significantly reduced toxicity after degradation. This work provides a novel strategy for developing high-performance OV-rich core-shell photocatalysts.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Di Zhang,Juanyuan Hao,Peng Wan,Dan Zhang,Quan Sun,Zongjun Liu,Fei Li,Haitao Fang,You Wang
The rapid recombination and poor redox capability of photoinduced charge carriers seriously impede the photocatalytic activity . Herein, a direct Z-scheme photocatalyst was fabricated by selectively depositing Ag 6 Si 2 O 7 nanoparticles (NPs) on the {0 4 0} facets of BiVO 4 . Owing to the facet-dependent band structure of BiVO 4 , the photoinduced electrons and holes can be pre-separated upon photoillumination and transfer to {0 4 0} and {1 1 0} facets of BiVO 4 , respectively. A rapid combination of the separated electrons at the {0 4 0} facets of BiVO 4 with holes of the Ag 6 Si 2 O 7 NPs then takes place triggering a direct Z-scheme photocatalysis. Such a charge pre-separation triggered by the faceted BiVO 4 , together with Z-scheme at the interface warrants not only effective photoinduced charge separation but also excellent redox capability owing to the increased redox potential. The photocatalytic rate constant of the optimum BiVO 4 {0 4 0}/Ag 6 Si 2 O 7 heterostructure is 28.2 and 17.2 times higher than those of pristine BiVO 4 and Ag 6 Si 2 O 7 , respectively. This study offers a new insight for constructing direct Z-scheme photocatalysts with high degradation efficiency based on facet-controlled crystals.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yachao Xu,Xue Han,Zhong Zhou,Peng Yu,Bojing Sun,Ying Wang
Designing an efficient reduction of soluble U(VI) to insoluble U(IV) is a challenge, and efficient electron-hole transfer efficiency is the key to the conversion of U(VI) to U(IV). Herein, defective transition metal sulfide (O v -ZAF) Z-Scheme tandem heterojunctions with spatial separation were synthesized using an in situ self-assembly method. O v -ZAF has excellent electron-hole separation, stabilized reactive active sites, and excellent visible light absorption. O v -ZAF is able to realize the photocatalytic U(VI) reduction reaction (URR) and water oxidation reaction (WOR) synergistically. The results showed that O v -ZAF was able to reduce 498.3 mg/g of U(VI) in 100 ppm uranium solution for 200 min, with a reduction efficiency of 99.8 %. O v -ZAF showed excellent reduction ability in a variety of uranium-containing waste solutions as well as in real seawater. In addition, O v -ZAF is capable of generating reactive oxygen radials (ROS) and has excellent antimicrobial activity against Escherichia coli, Staphylococcus aureus and Pseudoalteromonas xiamen . Oxygen vacancies and tandem components can tune both occupied and unoccupied orbitals near the Fermi level of O v -ZAF. This work provides a possibility of efficient uranium reduction engineering through tunable compositions and electronic structures.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Hanlu Zeng,Yunlan Xu,Dengjie Zhong,Yuqin Yang,Qingmei Qiao
Photocatalytic fuel cell (PFC) provides a new method to degrade organic pollutants and recover their energy simultaneously. In this work, a novel flower-like hierarchical photoanode (PANI/Bi 2 Sn 2 O 7 /BiOBr/Ti) was synthesized by solvothermal method and assembled with Cu cathode to form a PFC for rhodamine B (RhB) degradation and simultaneous power generation. The crystal structure, chemical composition, and morphology of the photoanode was characterized by a variety of analysis techniques. The photocatalytic activity of the ternary hierarchical composite photoanode was superior to that of single and binary composite photoanodes. Its maximum photocurrent density, maximum power density, degradation rate and FF were 0.241 mA·cm −2 , 21.52μW·cm −2 , 92.97 % (90 min) and 0.18, respectively. In addition, it still maintains high photocatalytic activity after five consecutive uses. Based on the analysis results of transient photocurrent (i-t), EIS, DRS spectrum, M-S curve and free radical capture experiments, the improvement of photocatalytic performance of PANI/Bi 2 Sn 2 O 7 /BiOBr/Ti photoanode is attributed to the formation of dual Z-scheme heterojunction between PANI and BiOBr and between Bi 2 Sn 2 O 7 and BiOBr, which realizes the rapid separation and transfer of electron-hole pairs, and retains the strong oxidation of holes in VB of BiOBr and the strong reduction of electrons in LUMO of PANI and CB of Bi 2 Sn 2 O 7 . This study provides a new research idea for the design and construction of high efficiency photoanode in PFC system.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Kexin Yang,Zhijia Song,XiaoXiao Fu,Wei Yan,Tao Zhang,Yiwei Hua,Haixin Lin,Qin Kuang,Zhaoxiong Xie
The photocatalytic direct one-step two-electron (2e-) oxygen reduction reaction (ORR) holds great potential in efficient H2O2 synthesis. However, it is still a significant challenge to design photocatalysts for achieving high-efficiency H2O2 production via this direct one-step 2e- ORR pathway. To address this, we have constructed a Z-scheme BAIO/C3N4 heterojunction by in situ growing Ba2AgIO6 (BAIO) on the surface of C3N4 nanosheets. Under visible light irradiation, the optimal sample, with a BAIO:C3N4 mass ratio of 1:1.5, exhibited a remarkable H2O2 yield of up to 535.9 μmol g-1 h-1, which is 8.8 times higher than that of pure C3N4. This enhancement is attributed to the improved charge separation and migration efficiency facilitated by the enhanced internal electric field (IEF) in BAIO/C3N4 heterojunction. Furthermore, the heterojunction altered the O2 adsorption configuration to the Yeager-type, promoting a more efficient and selective direct one-step 2e- ORR for H2O2 production. This study highlights the importance of regulating the reaction pathway to enhance photocatalytic H2O2 production activity and offers a new insight for designing highly active photocatalysts.
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RSC Advances
·
2025
·Vol. 15
·期 38
·31508-31521
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IF 4.6
Donghai Li,Yunrui Xu,Shilin Zhang,Linping Wang
To improve the utilization of solar energy and the efficiency of photocatalytic organic pollutant degradation, novel Z-scheme heterojunctions with high visible light catalytic performances have been widely developed. Herein, a novel Z-scheme BiFeO3/Ag/g-C3N4 heterojunction with a hierarchical 1D/0D/2D structure and visible light absorption was constructed by matching the suitable band structure between 1D BiFeO3 and 2D g-C3N4 and employing the localized surface plasmon resonance (LSPR) effect of 0D Ag nanoparticles. BiFeO3 nanofibers were synthesized via the electrospinning technique, providing short electron transport paths and visible light absorption range for g-C3N4. Plasmonic Ag nanoparticles were photodeposited on the surface of BiFeO3 to enhance the separation efficiency of the photogenerated electron–hole pairs between the bulk interfaces. UV-vis DRS, PL, photocurrent and EIS spectra confirmed the important roles of Ag and BiFeO3 in improving the photocatalytic activity of the Z-scheme heterojunction. The working principle of the BiFeO3/Ag/g-C3N4 Z-scheme heterojunction was proposed, indicating that ˙O2− and ˙OH are the main active species for the photocatalytic degradation of methylene blue (MB). The prepared BiFeO3/Ag/g-C3N4 heterojunction exhibited the highest photocatalytic activity, where its rate constant was 5.84 times higher than that of the pristine BiFeO3 and 3.26 times higher than that of the pristine g-C3N4. This study offers a new means for the design of novel high-performance photocatalysts, which can be a promising candidate in industrial applications.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Haiping Liu,Jing Liang,Li shao,Jinge Du,Qiancheng Gao,Shuai Fu,Li Li,Miao Hu,Fengying Zhao,Jianguo Zhou
The dual defect mediated Z-scheme MoS 2 /g-C 3 N 4 photocatalyst was fabricated via a simple ultrasonic dispersion and annealing method. The structural, optical and electronic property was systematically characterized. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the MoS 2 was anchored on the g-C 3 N 4 through strong interface electrostatic interaction , which led to the formation of built-in electric field at the contact interface. The optimized MoS 2 /g-C 3 N 4 heterojunction achieved a superior photoefficiency towards bisphenol A (BPA) degradation and exhibited the reaction rate normalized to specific surface area of 3.22 × 10 −4 g·min −1 m −2 , approximately 10.0 and 6.7 times larger than these of g-C 3 N 4 and MoS 2 , respectively. The origin of the enhanced photocatalytic activity of MoS 2 /g-C 3 N 4 was attributed to the formation of intimate Z-scheme surface heterostructure between MoS 2 and g-C 3 N 4 , thus improved the light-harvesting ability, facilitated fast charge separation and created more active sites. The impact of anionic towards degradation efficiency was investigated. The degradation activity and degree of BPA were investigated by three-dimensional excitation-emission matrix (3D EEM) fluorescence technique. The Z-scheme charge transfer mechanism and the significant contribution of holes (h + ) and superoxide radicals ( O 2 − ) were demonstrated by electron spinning resonance (EPR), radical scavenger experiment and spectral quantification technology. This work could offer a new protocol for the design of highly efficient heterostructure photocatalysts towards environmental remediation.
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