APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 9
·1-10
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IF 2.983
Wu Xiang-Feng,Fu Yun-Xuan,Chang Tian-Long,Jia Yun-Ning,Shang Jia-Lu,Wang Hui,Fan Zi-Hao,Wang Chen-Xu,Su Jun-Zhang,Ci Li-Jie
Bi nanoparticles were used to fabricate Bi/Bi 2 O 3 heterojunction by an in situ sintering method in a muffle furnace. The experimental results show that the surface plasmon resonance (SPR) effect and oxygen vacancy (OV) defects of Bi/Bi 2 O 3 hybrids can enhance the visible-light absorption and carrier separation efficiency, and thus improve the photocatalytic activity of Bi/Bi 2 O 3 composites for tetracycline (TC) degradation under visible-light illumination. Moreover, by means of increasing the calcination time of Bi nanoparticles, the photocatalytic degradation efficiency of the as-prepared hybrids shows a tendency of first increasing and then decreasing. When the calcination time was 15 min, a maximum value of 81.7% was reached within 60 min. This is higher than that of 16% of the pristine Bi nanoparticles. In addition, h + plays a major role during the degradation reaction of TC. This study can provide promising guide for the rational design and development of Bi-based photocatalysts and degradation of antibiotics under solar light illumination.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Yingnan Zhao,Xing Qin,Xinyu Zhao,Xin Wang,Huaqiao Tan,Huiying Sun,Gang Yan,Haiwei Li,Wingkei Ho,Shun-cheng Lee
Bismuth-based photocatalysts are a class of excellent visible-light photocatalysts; however, their redox activity is relatively poor and the efficiency of photogenerated carrier separation is low, limiting their development and application in the field of photocatalysis . To address these issues, a series of polyoxometalate PW 12 O 40 3– -doped Bi 2 O 3– x /Bi Schottky photocatalysts PW 12 @Bi 2 O 3– x /Bi- n (PBOB- n , where n is the amount of NaBH 4 , i.e., 6, 12, 18, 24, and 48 mg) were prepared by a simple electrospinning/calcination/in-situ NaBH 4 reduction method. In this composite photocatalyst, the doping of PW 12 could effectively adjust the electronic structure of Bi 2 O 3– x and improve its redox properties. As a shallow electron trap, PW 12 promoted the separation of the photogenerated carriers. Furthermore, desirable Schottky junction between the metal Bi nanoparticles and PW 12 @Bi 2 O 3– x further accelerated the separation of the photogenerated carriers. The synergistic effect of the aforementioned factors endowed PBOB- n with excellent photocatalytic activity. Among the samples, PBOB-18 exhibited superior photocatalytic activity. Under visible-light irradiation, 93.7% (20 mg catalyst) of 20 ppm tetrabromobisphenol A (TBBPA, 20 mL) was degraded in 60 min. Its activity was 4.4 times higher than that of Bi 2 O 3 . PBOB-18 also exhibited an ultrahigh photocatalytic performance for the removal of NO. Its removal rate (600 ppb) reached 83.3% in 30 min, making it one of the most active Bi-based photocatalysts. Furthermore, the photocatalytic mechanisms of PBOB-18 for TBBPA and NO have been proposed. This work provides a new direction and reference for the design of low-cost, efficient, stable, and versatile photocatalysts.
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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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Catalysis Science & Technology
·
2022
·Vol. 12
·期 5
·1685-1696
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IF 6.177
Liruhua Zhang,Qianhong Shen,Renyuan Zhan,Suhua Zheng,Jiansong Sheng,Hui Yang
Novel oxygen-vacancy-rich hierarchical Bi2MoO6@Bi2O3 core–shell fibers were prepared by the in situ growth of Bi2MoO6 nanosheets on Bi2O3 nanofibers via an electrospinning–calcination–solvothermal method. The in situ growth contributed to the formation of an intimate interface between Bi2MoO6 nanosheets and Bi2O3 nanofibers, thereby constructing an efficient 1D/2D heterojunction and obtaining a 3D hierarchical structure at the same time. More importantly, the growth of Bi2MoO6 nanosheets on Bi2O3 yielded superficial oxygen vacancies. Such a special morphology and defect structure could not only increase the light harvesting, but also promote the separation of photo-induced electrons and holes through a Z-scheme charge transfer mechanism. Therefore, the Bi2MoO6@Bi2O3 composite photocatalyst showed excellent photocatalytic performance under weak visible-light illumination, thus exhibiting potential for application in the degradation of antibiotics. This promising Bi2MoO6@Bi2O3 photocatalyst had a superior photocatalytic degradation rate of 96.3% for TC under 5 W LED visible-light irradiation for 3 hours, which was 6.0 and 4.9 times higher than those of pristine Bi2O3 and Bi2MoO6, respectively. Moreover, two main possible photocatalytic degradation pathways for TC over the Bi2MoO6@Bi2O3 photocatalyst were also proposed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Bowen Chen,Yuanwen Hou,Hanke Li,Hejun Gao,Hongquan Fu,Fang Liao,Juan Zhang,Yunwen Liao
The catalytic conversion of nitrogen to ammonia is one of the most significant processes in nature and the chemical industry. However, the traditional Haber-Bosch process of ammonia synthesis consumes substantial energy and emits a large amount of carbon dioxide . The efficiency of photocatalytic N 2 activation is severely limited by the lack of N 2 adsorption sites and poor carrier utilization. Herein, an efficient α-Bi 2 O 3 /Bi 3 O 4 Br heterojunction is proposed with a photocatalytic nitrogen fixation activity of 238.67 μmol·g −1 ·h −1 . Compared with the BiOBr precursor, α-Bi 2 O 3 and Bi 3 O 4 Br, the α-Bi 2 O 3 /Bi 3 O 4 Br heterojunction with oxygen vacancies can improve the adsorption and activation capacity of N 2 and promote the separation efficiency of charge carrier pairs by accommodating photogenerated electrons under visible light through the mechanism of N -type semiconductors. Therefore, oxygen vacancies and heterojunction engineering of semiconductive nanomaterials provide a promising method for the rational design of photocatalysts to enhance the rate of ammonia synthesis under mild conditions.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng Zhang,Yu Huang,Yongfang Rao,Meijuan Chen,Xinwei Li,Wingkei Ho,Shuncheng Lee,Junji Cao
Bulk materials with a microporous structure are adverse to light adsorption, photoelectron and reactant transport in a photocatalytic reaction. Mesoporous photocatalysts have shown many marked advantages in photocatalytic fields. Herein, uniform mesoporous Bi@Bi 2 O 3 nanospheres were fabricated by HCl–ethanol chemical etching at low temperature (60 °C). The obtained mesoporous photocatalysis increased the NO removal efficiency (16%) and inhibited toxic NO 2 generation (3%) under visible light irradiation. Further oxidation of Bi and calcination at high temperatures were avoided during template removal. Moreover, the as-prepared sample possessed a remarkably narrower pore size distribution (3.2–3.9 nm) and stronger light and NO adsorption ability than the bulk microporous Bi@Bi 2 O 3 . Work function and the electron spin resonance test results also indicated that the position of the entire energy bands on Bi 2 O 3 was lowered. The amount of reactive oxygen species generated over the uniform mesoporous structure was higher than that over bulk Bi@Bi 2 O 3 . However, photoelectrochemical measurements indicated that the separation efficiencies of the photo-generated carriers were not improved over the uniform mesoporous Bi@Bi 2 O 3 . Comprehensive studies have shown that the oxidation ability rather than the enhanced separation efficiency of charge carriers accounted for the enhanced photocatalytic activity. This work elucidates the roles of a uniform mesoporous structure in NO x photocatalytic oxidation and provides an efficient strategy for structural engineering in preparing highly reactive and practical photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 15
·12325-12332
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IF 2.22
Yang Yan,Li Jie,Zhang Huaiwu,Wang Gang,Gan Gongwen,Rao Yiheng
The development of miniaturized high frequency ferrite ceramics is attracting widely interest for next generation MLCI (multi-layer chip inductors). However, there exist short comings in the microstructure adversely affecting magnetic properties. In this study, 0.5 wt% MnO 2 - x wt% Bi 2 O 3 ( x = 0.1, 0.5, 1.0, 1.5, 2.0, and 3.0) were introduced into NiCuZn ferrites to adjust the microstructure at low temperatures. Also, the microstructure changes and high frequency magnetic properties of NiCuZn ferrites were investigated via controlling the addition of MnO 2 –Bi 2 O 3 and sintering temperatures. SEM results indicated that quantitative MnO 2 can suppress abnormal grain growth when optimized amount of Bi 2 O 3 was added. In addition, various amounts of Bi 2 O 3 were added to adjust the magnetic properties by controlling grain growth. Results revealed that 0.5 wt% MnO 2 -1.5 wt% Bi 2 O 3 composite addition is a critical point to enhance the homogeneity of the samples. Also, interestingly, the dominant contribution to dynamic magnetization mechanism changes from spin rotation to domain wall motion when the content of Bi 2 O 3 is greater than 1.0 wt%. Finally, fine microstructure of NiCuZn ferrites with high permeability ( μ ′ ≈ 291), high saturation magnetization ( M s ≈ 58.83 emu/g), high saturation flux density ( B s ≈ 290.04), high Q factor (~ 75) and enhanced cutoff frequency (~ 60 MHz) can be obtained sintered at 925 °C. Thus, this work may provide new guidance for developing RF frequency LTCC NiCuZn ferrite ceramics.
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JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Jinfeng Zhang,Yingfei Hu,Xiaoliang Jiang,Shifu Chen,Sugang Meng,Xianliang Fu
A direct Z-scheme photocatalyst Bi 2 O 3 /g-C 3 N 4 was prepared by ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface areas, photoluminescence technique (PL), and electron spin resonance (ESR) technology. The photocatalytic activity was evaluated by degradation of methylene blue (MB) and rhodamine B (RhB). The results showed that Bi 2 O 3 /g-C 3 N 4 exhibited a much higher photocatalytic activity than pure g-C 3 N 4 under visible light illumination. The rate constants of MB and RhB degradation for Bi 2 O 3 (1.0 wt.%)/g-C 3 N 4 are about 3.4 and 5 times that of pure g-C 3 N 4 , respectively. The migration of photogenerated carriers adopts a Z-scheme mechanism. The photoexcited electrons in the CB of Bi 2 O 3 and photogenerated holes in the VB of g-C 3 N 4 are quickly combined, so the photoexcited electrons in the CB of g-C 3 N 4 and holes in the VB of Bi 2 O 3 participate in reduction and oxidation reactions, respectively. O 2 − , OH and h + are the major reactive species for the Bi 2 O 3 /g-C 3 N 4 photocatalytic system.
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高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Guangli Li,Nayu Chen,Yafeng Zhang,Tianyu Wang,Rui Zhu,Yuan Jin,Nanke Ma
Rhodamine B (RhB) is highly carcinogenic and is therefore prohibited as a food colorant. Hence, it is necessary to establish a simple but effective technique for the sensitive determination of RhB in foodstuff. Herein, an efficient voltammetric platform was established for the detection of RhB in chili oil based on flower-like β-Bi 2 O 3 microsphere/multiwalled carbon nanotube composites (β-Bi 2 O 3 /MWCNTs). Various microscopic and spectroscopic techniques confirmed the successful formation of β-Bi 2 O 3 /MWCNTs. Owing to the synergistic effect from β-Bi 2 O 3 microspheres and MWCNTs, the β-Bi 2 O 3 /MWCNTs demonstrated superior electrocatalytic activity for the oxidation of RhB as compared to the individual components. Electrochemical kinetics tests confirmed that the RhB electrooxidation was governed by an irreversible and adsorption-controlled process, and involved two electrons one proton transfer pathway. The oxidation peak currents of RhB were linearly correlated with RhB concentrations ranging from 0.05 to 100 μM with a low limit of detection (0.002 μM). The β-Bi 2 O 3 /MWCNT demonstrated strong anti-interfering ability against other azo colorants, and retained robust voltammetric responses for at least 14 days. Moreover, the concentrations of RhB in chili oil were accurately detected by the β-Bi 2 O 3 /MWCNT via second-order derivative linear scan voltammetry with satisfactory recovery. Overall, the β-Bi 2 O 3 /MWCNT/GCE shows great potential for in-situ analysis of trace amounts of RhB in various food matrices.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Lanfei Wei,Jiaquan Liu,Qiuman Zhou,Shaolong Liu,Zhifeng Su,Yurong Yan
Bismuth trioxide (Bi 2 O 3 ) acts as an ideal material for supercapacitors because of its high theoretical specific capacity, but its crystal form and compact accumulation limit its specific capacitance below its theoretical value of 1370 F g -1 . In this study, a specific kapok fiber@chitosan-derived carbon (KCC) doping inside β/α hybrid-crystal Bi 2 O 3 (KCC-Bi 2 O 3 ) was constructed by KCC assisting to enhance the contact area between Bi-MOF and air during calcination. A specific capacitance of 1135 F g -1 at 1 A g -1 was obtained for KCC-Bi 2 O 3 , which matched 82.3 % of its theoretical value. An asymmetric capacitor, with KCC-Bi 2 O 3 as a negative electrode and NiCo-LDH as a positive electrode, exhibits a potential window of 1.6 V and an energy density of 17.3 Wh kg -1 at 800 W kg -1 . The result demonstrates that incorporating a KCC carbon source can significantly enhance the capacitance of mixed crystal form Bi 2 O 3 , highlighting its potential in supercapacitor applications.
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JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Wenxiao Zhang,Zize Zhao,Ziyang Zhu,Li Zhang,Xiaohui Xu,Xuemei Chen,Xinyan Wang,Min Lu
The rapid development of high-performance electrode materials for asymmetric supercapacitors (ASCs) needs to solve the bottleneck problem of low energy density. Compared with the positive electrode material, the development of the negative electrode material is relatively lagging and has become one of the key "short board" to limit the energy density of the supercapacitor device. In this study, the oxygen vacancy-rich CuBi 2 O 4 nanoparticles are triumphantly anchored on the interface of rod-like Bi 2 O 3 after calcination to prepare the heterostructure CuBi 2 O 4 /Bi 2 O 3 (CBO/BO) composites by the combination of simple hydrothermal process and calcination. Due to the unique anchoring mode, heterogeneous structure, and oxygen vacancy introduction, the CBO/BO as the cathode processes the capacitance of 294.7 mAh g −1 at 1 A g −1 . In addition, bimetallic NiCo layered double hydroxides (NCL) with the 3D flower-like structure prepared by a one-pot process is used as the positive electrode and the specific capacitance of 186.7 mAh g −1 at 1 A g −1 . The assembled water-based NCL//CBO/BO ASC triumphantly amplifies the potential window to 1.7 V, achieves the ultrahigh energy density between 91.8 and 52.9 Wh kg −1 at 850–8500 W kg −1 , and maintains the remarkable cycle consistency. Density functional theory calculation fully proves that oxygen vacancy and copper doping can significantly improve the electrochemical performance of electrode materials. Therefore, the research results in this paper afforded a feasible way to further develop asymmetric supercapacitors with ultrahigh energy density.
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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.
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