APPLIED SURFACE SCIENCE
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2021
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IF 6.707
Hao Ma,Xia Yang,Xiaoning Tang,Xinyue Cao,Rong Dai
A series of β-Bi 2 O 3 with different Co doping amounts were prepared by a co-precipitation and pyrolysis process. A flower-like self-assembly of β-Bi 2 O 3 sheets was realized by the doping of Co. Simulation results showed that an impurity state was introduced into the band gap of doped β-Bi 2 O 3 , mainly due to the Co 3d orbital. Co doping enhanced the visible light utilization rate by reducing the band gap and improving electrons holes separation efficiency. E. coli was used to evaluate the photocatalytic antibacterial ability of undoped and Co-doped β-Bi 2 O 3 under visible light . β-Bi 2 O 3 exhibited optimal efficiency for both electron-hole separation and antibacterial effect when doped with 0.4% Co (0.4%-CBO). Gradient experiments were performed to determine that reactive oxygen species (ROS) were the main factor behind the antibacterial effect of β-Bi 2 O 3 . The enhanced antibacterial properties of 0.4%-CBO were due to its increased production of O 2 – , OH, and H 2 O 2 , with scavenger experiments finding that O 2 – was the main contributor to its antibacterial effect. Through the detection of lipid peroxidation and bacterial respiratory chain dehydrogenase activity, it was determined that the antibacterial effect of ROS simultaneously occurred in the interior and exterior of E. coli and that this activity was enhanced by Co doping.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
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IF 4.61
Limin Hu,Guangshan Zhang,Meng Liu,Qiao Wang,Shuying Dong,Peng Wang
Nickel foam (NF)-functionalized Co 3 O 4 -Bi 2 O 3 nanoparticles (CBO@NF) synthesized using a facile one-step microwave-assistant method were employed as catalysts to activate peroxymonosulfate (PMS) with bisphenol A (BPA) as the target pollutant. The crystallinity , morphology, and chemical valence state of the synthesized CBO@NF were analyzed using XRD, SEM , and XPS, respectively. Moreover, effects of the preparation parameters, including the calcination temperature and calcination time as well as the loading dosage, were evaluated in detail. A degradation efficiency of 95.6% was achieved within 30 min with the optimal degradation system. The CBO@NF/PMS system shows great catalytic activity in a pH range from 3.0 to 11.0. The stability and reusability of the CBO@NF supported catalyst was evaluated through a recycling experiment. In addition, the possible degradation mechanism was also explored using a quenching experiment and electron paramagnetic resonance (EPR) detection. The result shows that both the surface-bound SO 4 − and OH play significant roles during the degradation process, where the electron transfer of Co 2+ /Co 3+ , Bi 3+ /Bi 5+ , and Ni 2+ /Ni 3+ realizes the sustained regeneration of the active radicals. This work provides new insight for the practical applications of sulfate radical-based advanced oxidation processes (SR-AOPs) in wastewater treatment .
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Hongjing Zhen,Muhammad Asim Khan,Mingzhu Xia,Wu Lei,Fengyun Wang
In this article, Bi 2 O 3 /Bi 2 MoO 6 composites were synthesized hydrothermally under optimized conditions, by adjusting pH, the concentration of polyvinylpyrrolidone (PVP (K30)) and reaction time. During the synthesis process, flower-root shaped zero-gap Bi 2 O 3 /Bi 2 MoO 6 heterojunctions were successfully synthesized. The adopted samples were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), Diffuse reflectance spectra (DRS), Photoluminescence (PL), and Fourier transform infrared spectroscopy (FT-IR). The photocatalytic activity was measured under visible-light-irradiation (λ > 420 nm) by degrading tetracycline (TC), ciprofloxacin (CPFX) (antibiotics) and rhodamine B (RhB), methylene blue (MB) (dangerous dyes). The degradation results indicated that photocatalyst sample synthesized at pH 9.0, PVP (K30) 0.05 mol/L and 80 min reaction time (Sup-Bi 2 O 3 /Bi 2 MoO 6 ) demonstrated highly efficient performance. The Sup-Bi 2 O 3 /Bi 2 MoO 6 showed the highest apparent rate constant (K app ) that’s 50% more than the samples prepared at ordinary conditions. Photocatalytic degradation order was i.e. RhB > TC > CPFX > MB, which depends on the polarity of the degrading medium.
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CERAMICS INTERNATIONAL
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2015
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IF 2.605
Tingting Li,Shenglian Luo
Ag 2 O/Bi 2 O 3 microspheres were successfully synthesized by a facile co-precipitation hydrothermal method in the presence of surfactant polyvinylpyrrolidone (PVP). X-ray diffraction confirmed that Ag 2 O/Bi 2 O 3 was made up of the cubic Ag 2 O phase and the tetragonal Bi 2 O 3 phase. Scanning electron microscopy and transmission electron microscopy showed that the synthesized Ag 2 O/Bi 2 O 3 microspheres were assembled by radially grown nanosheets with the thickness of about 50 nm. In comparison with N-doped TiO 2 , Bi 2 O 3 and Ag 2 O, the Ag 2 O/Bi 2 O 3 composites showed much higher efficiency for photodegradation of Rhodamine B (RhB) under visible light irradiation ( λ ≥420 nm). Among the Ag 2 O/Bi 2 O 3 composites, the sample with 0.3 mol fraction of Ag 2 O exhibited the highest photocatalytic activity. The excellent photocatalytic activity of Ag 2 O/Bi 2 O 3 may be ascribed to the strong visible light absorption resulting from the quantum dot sensitization of Ag 2 O and the efficient separation of photogenerated electron–hole pairs through Ag 2 O/Bi 2 O 3 heterojunction . The possible photocatalytic mechanism was proposed based on band gap structure analysis and the reaction effects by adding the radical scavengers.
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CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Hongqiang Shen,Jixiang Wang,Jinhui Jiang,Bifu Luo,Baodong Mao,Weidong Shi
A series of RGO-Cu 2 O/Bi 2 O 3 composite photocatalysts was developed by depositing Cu 2 O and Bi 2 O 3 nanocrystals on the surface of RGO via an in situ precipitation method. The Cu 2 O and Bi 2 O 3 nanocrystals distributed uniformly and separately on RGO, which favored the transfer of photogenerated electrons and holes towards an effective path. Compared with RGO-Cu 2 O and RGO-Bi 2 O 3 , the three-component RGO-Cu 2 O/Bi 2 O 3 composites presented a further improvement on the photodegradation of tetracycline (TC) under visible light irradiation, which can be attributed to the construction of a Z-scheme photocatalytic system where the RGO served as a solid-state medium for the transfer of the photogenerated electrons from the conduction band of Bi 2 O 3 to the valence band of Cu 2 O.
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JOURNAL OF HAZARDOUS MATERIALS
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2016
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IF 4.836
Qi Wang,Xiaodong Shi,Enqin Liu,John C. Crittenden,Xiangjuan Ma,Yi Zhang,Yanqing Cong
AgI sensitized BiOI-Bi 2 O 3 composite (AgI/BiOI-Bi 2 O 3 ) with multi-heterojunctions was prepared using simple etching-deposition process. Different characterization techniques were performed to investigate the structural, optical and electrical properties of the as-prepared photocatalysts. It was found that the ternary AgI/BiOI-Bi 2 O 3 composite exhibited: (1) improved photocurrent response, (2) smaller band gap, (3) greatly reduced charge transfer resistance and (4) negative shift of flat band potential, which finally led to easier generation and more efficient separation of photo-generated electron-hole pairs at the hetero-interfaces. Thus, for the reduction of Cr(VI), AgI/BiOI-Bi 2 O 3 exhibited excellent photocatalytic activity under visible light irradiation at near neutral pH. AgI/BiOI-Bi 2 O 3 was optimized when the initial molar ratio of KI to Bi 2 O 3 and AgNO 3 to Bi 2 O 3 was 1:1 and 10%, respectively. The estimated k Cr(VI) on optimized AgI/BiOI-Bi 2 O 3 was about 16 times that on pure Bi 2 O 3 . Good stability was also observed in cyclic runs, indicating that the current multi-heterostructured photocatalyst is highly desirable for the remediation of Cr(VI)-containing wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2017
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IF 6.216
Limin Hu,Guangshan Zhang,Qiao Wang,Yanlong Sun,Meng Liu,Peng Wang
A novel Co 3 O 4 -Bi 2 O 3 catalyst was synthesized by a microwave-assisted co-precipitation method and systematically characterized with multifarious techniques to investigate its crystallinity, morphology and chemical state of Co 3 O 4 -Bi 2 O 3 . The catalytic activity of Co 3 O 4 -Bi 2 O 3 in peroxymonosulfate (PMS) activation was assessed through bisphenol A (BPA) degradation. The results indicated that the catalyst synthesized by microwave irradiation and calcination treatment of 200 °C exhibited good stability, high catalytic activity and mineralization percentage of BPA degradation under a broad pH range in the Co 3 O 4 -Bi 2 O 3 /PMS system. The BPA degradation in aqueous solution of 20 mg·L −1 reached almost 100% within 30 min by using 0.3 g·L −1 of catalyst and [PMS]/[BPA] = 5 at pH ranging from 3.0–9.0. The activation energy ( E a = 50.59 kJ·mol −1 ) was calculated under different reaction temperatures, indicating that the catalytic reaction occurred easily in the Co 3 O 4 -Bi 2 O 3 /PMS/BPA system. According to the characterizations of catalyst, as well as the dissolving and trapping studies, it was illustrated that BPA molecules were degraded mainly by the surface-bound SO4 − radicals. At the same time, the increase of cobalt (III) content was caused by the catalytic reaction between PMS and cobalt (II) on the surface of catalyst. Overall, the study could lay groundwork toward the catalyst-activated peroxymonosulfate-based oxidation system in wastewater treatment.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 5
·4656-4666
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IF 2.741
Hu Limin,Zhang Guangshan,Liu Meng,Wang Qiao,Wang Peng
In this work, Co 3 O 4 -Bi 2 O 3 was successfully synthesized using a microwave-assisted method [Co 3 O 4 -Bi 2 O 3 (MW)] and employed as a peroxymonosulfate (PMS) activator for bisphenol A removal. A reference catalyst was prepared using the same preparation conditions but different heating mode and labeled as Co 3 O 4 -Bi 2 O 3 (CH). The series of Co 3 O 4 -Bi 2 O 3 was characterized using XRD, SEM, and N 2 adsorption to detect their crystallinity, morphology, and surface area, among others. Results indicated that both microwave and calcination significantly affected the characteristic and catalytic activity of the catalyst. Moreover, the microwave-irradiated catalyst calcined at 300 °C showed higher catalytic activity and mineralization percentage for BPA degradation than the conventionally heated catalyst calcined at the same temperature. Microwave temperature and microwave time of the proposed microwave-assisted method were also investigated. Compared with other catalysts, the present catalyst showed considerably superior preparation time and degradation efficiency. This study broadens a new horizon for advanced oxidation process using a PMS activator.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
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IF 3.8
Wen-Bo Li,Li-Xia Pang,Xiao-Long Wang,Wei-Guo Liu,Xiaogang Yao,Huixing Lin,Jin-Chao Miao,Di Zhou
This study examines the microwave dielectric properties of the Na 2 O–Bi 2 O 3 –Ln 2 O 3 –MoO 3 (Ln = Sm and Y) system, synthesized via a solid-state process at ultra-low sintering temperatures ranging from 600°C to 660°C. The X-ray diffraction and Rietveld refinement results suggested that a tetragonal sheelite phase was found in the x Na 5 Bi(MoO 4 ) 4 –(1− x )Na 5 Ln(MoO 4 ) 4 (0.05 ≤ x ≤ 0.20) ceramics. Scanning electron microscopy (SEM), backscattered electron image (BSE) and energy dispersive spectrometer (EDS) results indicated that the complex substitution of Bi 3+ produced a significant effect on the microstructural morphology. Besides, the substitution of Bi 3+ for (Sm 0.3 Y 0.7 ) 3+ effectively reduced the sintering temperature to 630°C. The variation of theoretical dielectric polarizabilities (α theo. ), the polarizability density (α theo. / V m ), the observed dielectric constant (ε r ), theoretical dielectric constant (ε theo. ), packing fraction (PF) values, and bond valence ( V i ) as a function of x value were investigated, which was helpful for understanding microwave dielectric properties. The ceramic composition 0.1Na 5 Bi(MoO 4 ) 4 –0.9Na 5 Ln(MoO 4 ) 4 sintered at 630°C for 2 h demonstrated the best microwave dielectric properties, exhibiting a ε r ∼ 9.3, Q × f value of about 31,200 GHz (at 11 GHz) and a temperature coefficient (τ f ) of −41.3 ppm/°C. Both XRD and EDS results indicated that the 0.1Na 5 Bi(MoO 4 ) 4 –0.9Na 5 Ln(MoO 4 ) 4 ceramic was chemically compatible with Ag at its sintering temperature (630°C). The x Na 5 Bi(MoO 4 ) 4 –(1− x )Na 5 Sm 0.3 Y 0.7 (MoO 4 ) 4 (0.05 ≤ x ≤ 0.20) ceramics in the Na 2 O–Bi 2 O 3 –Ln 2 O 3 –MoO 3 (Ln = Sm and Y) system are promising candidates for 5G and its successor 6G mobile communication technology.
研究领域:
材料科学
·
电子陶瓷
·
微波通信
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Ceramics-Switzerland
·
2026
·Vol. 9
·期 4
·37
·
IF 2.8
Chaochen Chen,Fang Lei,Shiqing Dang,Hongyang Zhang,Ying Shi,Haohong Chen
To address the lack of suitable glass systems for silicon nitride (Si3N4) surface metallization, which requires high wettability and thermal stability, and robust bonding between the copper layer and the ceramic substrate, a novel Bi2O3-TeO2-B2O3-CuO glass system was developed. This study systematically investigated the influence of Bi2O3concentration, glass properties, optimized paste composition, and brazing mechanism using phase analysis, microstructural characterization, particle size statistics, thermal analysis, and tensile testing. An optimal glass composition containing 20 mol% Bi2O3was identified, exhibiting high thermal stability (ΔT = 224 °C) and a coefficient of thermal expansion of 9.63 × 10−6°C−1. At a brazing temperature of 750 °C, the glass demonstrated excellent wettability with a contact angle of 27°. A conductive paste comprising 94 wt% Cu and 6 wt% glass yielded a thick film with a minimum resistivity of 6.25 μΩ·cm and a maximum tensile strength of 25.2 MPa. Mechanism analysis revealed that the superior wettability drives the liquid glass phase to form a thin intermediate layer that significantly reinforces adhesion. These findings contribute to the research and development of subsequent novel glass systems with superior performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 19.7
Xue Yang,Donghui Cui,Yu Liu,Yuexin Xiang,Fengyan Li,Guangshan Zhu
Al/Bi-O acid-base pairs were built by spatially selective Al doping in BiOBr/Bi 2 O 3 heterojunction. • The NH 3 yield reached 801.3 μmol g −1 h −1 in pure water, exceeding transition metal doped systems. • Al 3+ polarization activates lattice oxygen as primary Lewis base sites. • In situ KPFM visualizes S scheme charge transfer and the amplified built in field from Al doping. • Oxygen vacancies supply π backdonation channels and enrich electron density of nearby lattice oxygen. Photocatalytic nitrogen fixation has long been constrained by the intrinsic inertness of the N N bond and the severe recombination of photoexcited electron-hole pairs. Here, we construct an aluminum-doped BiOBr/Bi 2 O 3 S-scheme heterojunction in which Al 3 + selectively replaces Bi 3+ sites in the BiOBr lattice, while the Bi 2 O 3 phase retains its inherent crystal structure almost entirely. This asymmetric doping configuration strengthens the internal electric field across the S-scheme interface. The strong polarizing ability of Al 3+ activates nearby lattice oxygen atoms into Lewis base sites and induces the formation of additional oxygen vacancies (Ov), while simultaneously extracting electron density from adjacent Bi centers via Al-O-Bi bridge bonds, thereby enhancing the Lewis acidity of Bi. The resulting Al/Bi-O Lewis acid-base pair activates N 2 through a synergistic push-pull mechanism, in conjunction with the charge modulation induced by the oxygen vacancies. In pure water and in the absence of any sacrificial agent, the optimally designed photocatalyst achieves an NH 3 production rate as high as 801.3 μmol g −1 h −1 under simulated sunlight, surpassing transition-metal-doped analogues. This work establishes a lattice-confined Lewis acid-base pair paradigm, opening a new avenue for designing high-efficiency nitrogen-fixing photocatalysts. Download: Download high-res image (276KB) Download: Download full-size image In pure water and in the absence of any sacrificial agent, the optimally designed photocatalyst Al-BiOBr/Bi 2 O 3 achieves an NH 3 production rate as high as 801.3 μmol g −1 h −1 under simulated sunlight, surpassing transition-metal-doped analogues.
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Nature Communications
·
2026
·
IF 18.1
Wu Qianmin,Li Cui,Wu Yuxuan,Liang Qing,Lv Xuyu,Li Yanhong,Wang Chang,Wu Mengjie,Kong Lichun,Lu Ji-Qing,Zhang Wei,Li Zhengquan,Chen De-Li,Zhou Jing,Yang Fa
Stabilizing metal oxides is a prerequisite for elucidating their intrinsic mechanistic roles and sustaining high electrocatalytic activity. Here, we synthesize a high-temperature-phase La 2 O 3 -socketed sub-2 nm δ-Bi 2 O 3 heterojunction (δ-Bi 2 O 3 /La 2 O 3 ) that suppresses Bi 3+ reduction to metallic Bi, achieving ≥95% formate Faradaic efficiency for ~200 hours in industrial-level electrolyzers. Electronic structure analyses reveal that strong electrostatic interactions between δ-Bi 2 O 3 and La 2 O 3 drive oxygen migration to the interface, contracting δ-Bi 2 O 3 domains and enhancing La–Bi d-p orbital hybridization. This structural relaxation stabilizes interfacial Bi–O–La linkages and electron-deficient Bi 2 O 3+x species under cathodic potentials, as confirmed by in situ X-ray absorption spectroscopy. Pourbaix diagrams and in situ infrared spectroscopy demonstrate that La 2 O 3 promotes water dissociation to form a hydroxylated δ-Bi 2 O 3 surface under working potentials, enhancing protonation propensity. Consequently, the energy barrier for the rate-determining step (*CO 2 → *HCOO) is lowered to +0.15 eV on δ-Bi 2 O 3 /La 2 O 3 , significantly lower than the +0.83 eV barrier on pristine δ-Bi 2 O 3 . This work establishes a sub-nanoscale oxide/oxide heterojunction strategy to stabilize high-valent metal sites, enabling sustainable electrochemical conversion.
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