CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 12
·15036-15047
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IF 3.45
Hui Zhou,Songtao Zhong,Ming Shen,Yufeng Yao
A three-dimensional (3D) flower-like β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunction photocatalyst was synthesized via decomposition of the precursor fabricated using a composite soft template, which was constructed from dl -aspartic acid and nonionic amphiphilic triblock copolymer (Pluronic F127). The morphology, phase structure, composition , effect of reactant concentration, and possible formation mechanism were systematically studied. The results showed that dl -aspartic acid was chosen as the coordination- and structure-directing agent, while F127 was used as the capping agent during preparation of the precursor. The as-prepared flower-like β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunction obtained after calcination of the self-sacrificing precursor at 290 °C showed excellent photocatalytic performance in the degradation of the refractory colorless antibiotic agent tetracycline (TC) under simulated sunlight irradiation, with 98.79% TC degradation being achieved within 60 min of irradiation. This excellent photocatalytic performance was attributed to the narrow band gap, heterojunction structure , and 3D hierarchical structure. The results further revealed that photogenerated holes (h + ) and hydroxyl radicals ( • OH) dominated the photocatalytic process. Furthermore, the β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunction catalyst was not photocorroded after six consecutive cycles, suggesting an excellent photostability.
研究领域:
材料科学
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环境催化
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光催化
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纳米材料
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环境工程
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 12
·5903-5914
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IF 3.3
Xiaoqing Wang,Yujie Ren,Hongjing Lu,Zirui Song,Yangdong Cui,Shiyao Jin,Binhe Zhao,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
Using macroporous ion exchange resin macrosphere D113 as an inexpensive organic carbon source, a composite precursor was constructed with Bi(OH)3 using a hydrothermal method. A series of new bismuth-based composite photocatalytic materials, Bi2O3/C, were prepared using pyrolysis technology and it was shown that the bismuth element existed in the form of Bi2O3 in the composite. It was uniformly distributed on the surface of a graphitized carbon macrosphere and exhibited a high electron transfer rate. The UV-vis diffuse reflectance spectrum and photoluminescence verified that Bi2O3/C exhibited a good light absorption performance and a low photogenerated electron hole recombination rate due to the optimized band structure. Electrochemical tests such as an i–t curve and electrochemical impedance spectroscopy showed that Bi2O3/C-500 had a good photoelectric response. In combination with the Tauc curve, the band structure of Bi2O3/C-500 was verified. Bi2O3/C-500 could degrade methylene blue (20 mg L−1) completely in 120 min, and the degradation rate remained at 90.30% for three photocatalytic cycles. The preparation method of the new Bi2O3/C was simple, inexpensive, and convenient for the commercial application of dye wastewater.
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高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 9
·3500-3509
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IF 8.067
Dongnv Jin,Jiliang Ma,Runcang Sun
Coupling a semimetal with a semiconductor on nitrogen-doped carbon for photocatalytic reforming of biomass-derived feedstocks into high value-added chemicals is of great significance; however, no success has been achieved to date. Here, uniformly dispersed Bi/Bi2O3 nanospheres with a Mott–Schottky heterojunction embedded on the nitrogen-doped biochar nanosheets (Bi/Bi2O3@N-BC) were developed and successfully used in photocatalytic biomass-reforming to lactic acid. A built-in electric field between the interfaces of Bi and Bi2O3 was constructed via the Schottky effect of the Bi/Bi2O3 heterojunction, resulting in the rapid separation/migration of electrons–holes; whereas the N-BC facilitates the adsorption of reactants and the mass transfer of products or by-products. The highest yield of lactic acid reached was 91.21%, and Bi/Bi2O3@N-BC displayed excellent stability, reusability and universality. The experimental results indicated that the contents of photoinduced h+, ˙O2−, ˙OH and 1O2 increased with prolonging the visible-light irradiation time, and trapping tests suggested that ˙O2−, 1O2 and h+ promoted the lactic acid production in turn, whereas ˙OH inhibited the reaction. A 1000-fold scale-up experiment showed that the economically and environmentally viable system has potential for application in the industrial production of lactic acid, and this work also provides an efficient strategy for the development of functional photocatalysts and photocatalytic biorefinery.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Luobin Zhang,Qin Sun,Jintao Wang,Zheng Zhang,Weiwei Zhang,Jianqiang Wang,Hongtao Chen,Mingyu Li
We studied the feasibility of using Bi-based lead-free glass paste as bonding material on soda-lime glass substrates, without any activation preparation on the bonding surfaces. In order to fabricate Bi 2 O 3 -B 2 O 3 -ZnO-BaO-SrO system low-melting glass frit, quenching is performed using deionized water after melting using a muffle furnace. Glass paste consisting of glass frit mixed with organic solvent is deposited on the surface of the soda-lime glass substrate by screen printing, and the sealing of the glass substrate is finally achieved at the bonding temperature (500 °C). we discuss the properties of glass powder, the joint microstructure of irregular amorphous glass, the shear properties and the glass frit bonding mechanism based on the characterization results of DSC , XRD , FTIR, Raman, XPS , SEM and TEM. Furthermore, the investigation concentrated on mechanical properties and microstructural characterization of the joined area with two silica substrates. As the SrO content increased from 0 to 3 mol%, T g increased from 396 °C to 418 °C with increasing SrO content. Accompanied by an increase in SrO content from 1 mol% to 2 mol%, the room-temperature shear strength of the glass specimens increased from 28.5 to 45 MPa. The growth of Bi 24 B 2 O 39 crystallites precipitated at the interface was studied.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74977-74985
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IF 3.84
Xin Xiao,Shunheng Tu,Chunxia Zheng,Huan Zhong,Xiaoxi Zuo,Junmin Nan
Large-scale synthesis of nanosized β-Bi2O3 is a significant challenge due to its metastable state. A facile L-asparagine-assisted reflux–calcination route was successfully developed for the large-scale preparation of β-Bi2O3 micro/nanostructures under mild conditions (low temperature, atmospheric pressure, and wide temperature windows). The composition, phase structure, morphology, surface area, and photoabsorption properties of as-synthesized β-Bi2O3 and its precursor were systematically characterized. The phase transformation conditions and possible formation mechanism of flower-like β-Bi2O3 were discussed. It is found that with a simple reflux process under atmospheric pressure at 100 °C, uniform monodisperse bismuth–asparagine complex microspheres with average diameters of ∼500 nm were produced and flower-like β-Bi2O3 micro/nanostructures were then conveniently obtained after precursor calcination at temperatures ranging from 340 °C to 420 °C. A surface CO32− coordination effect introduced from L-asparagine explained the formation of stabilized β-Bi2O3 at low temperatures (up to 420 °C). The as-synthesized β-Bi2O3 shows excellent photocatalytic activity toward the degradation of 4-phenylphenol under visible-light irradiation, which is 3.7 and 21.4 times faster than the removal rates of β-Bi2O3 nanospheres and a commercial β-Bi2O3, respectively, and allows for the elimination of 93.2% total organic carbon after 60 min of irradiation. In addition, the photogenerated reactive species were identified by radical scavenger experiments and electron paramagnetic resonance spectroscopy, and a possible visible-light-induced photocatalytic mechanism was then proposed.
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 48
·38373-38381
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IF 3.84
Xin Xiao,Ruiping Hu,Shunheng Tu,Chunxia Zheng,Huan Zhong,Xiaoxi Zuo,Junmin Nan
β-Bi2O3 micro/nanostructures with tunable morphologies were synthesized via a one-pot solvothermal–calcining route, and their photocatalytic activity toward degrading methylparaben (MeP, a widely used preservative with estrogenic activity) was evaluated under visible-light (λ ≥ 420 nm) irradiation. The formation process of β-Bi2O3 catalysts can be described as reduction of Bi3+ through a solvothermal reaction, followed by oxidization of metal Bi via calcination in air. During this process, the organic reductants (single or a mixture of ethylene glycol, D-fructose, and ascorbic acid) play important roles in determining the final morphologies and structures of the materials. Photocatalytic tests reveal that MeP can be effectively degraded and mineralized by using synthetic β-Bi2O3 catalysts, and the reaction rate constant of an optimum sample is more than 25 and 160 times faster than a commercial Bi2O3 and synthetic N-TiO2, respectively. The superior photocatalytic activity of the optimum product is ascribed to its pure beta phase with a narrower band gap, good absorption of visible light, more efficient separation of electrons and holes, relatively higher BET specific surface area, and three-dimensional architectures, which favor more surface active sites and easier mass and photoinduced charge transportations. In addition, the main reactive oxygen species and possible degradation intermediates were detected, and the results suggest that photogenerated holes and superoxide radicals are the predominant species in the photochemical oxidation process.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Chunping Su,Mengxi Cheng,Hong Gao,Jun Li,Rong Chen
A superhydrophilic/underwater superoleophobic BiOCl/Bi 2 O 3 coated mesh was successfully prepared through a facile one-step hydrothermal method, which exhibits outstanding mechanical stability against sandpaper friction and resistance to water erosion and corrosive liquids. Notably, it demonstrates excellent oil/water separation efficiency and photocatalytic performance under visible light irradiation while preventing the adhesion of microorganisms to the coating surface, endowing anti-biofouling properties to the mesh. To achieve simultaneous separation of oil from water as well as degradation of soluble dye and bacteria pollutants in a single device, a superhydrophobic/superoleophilic BiOCl/Bi 2 O 3 coated mesh was also prepared using surface modification with octadecanethiol. Subsequently, a dual-layer mesh (DLM) was obtained by overlaying the superhydrophilic BiOCl/Bi 2 O 3 coating onto the superhydrophobic BiOCl/Bi 2 O 3 coating. The resulting dual-layer mesh with its superwetting properties enables concurrent oil–water separation, photodegradation of organic contaminants and photocatalytic bactericidal activity within trapped sewage. Furthermore, this versatile BiOCl/Bi 2 O 3 coated mesh can serve as a template for fabricating other bismuth-containing micro/nanostructure coatings with remarkable wetting properties. It is anticipated that such a versatile BiOCl/Bi 2 O 3 coated mesh possessing superior superwetting properties, robust mechanical durability, excellent anti-biofouling properties and outstanding photocatalytic activity will find promising applications in complex oily sewage purification systems.
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高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Yanting Ma,Yan Tang,Yajuan Xu,Suisui Su,Shuzhen Chen,Shizheng Zheng,Changyuan Hu,Xin Li,Kejie Dai,Rongbin Zhang
Metal oxides are promising alkaline battery electrodes with high theoretical capacity, but the low energy density and poor stability make them far away from actual application. Herein, single Bi-MOF derived ultrastable Bi2O3@C and BiOCl@C anodes are architected via a two-for-one manner. Specifically, optimal Bi2O3@C anode with hierarchical and porous structure delivers high specific capacity (278.3 mAh g–1 at 1 A g–1) owing to the exposed electrochemical active sites, fast charge transfer, and efficient ion diffusion. More importantly, ultrahigh stability (110%, 5000 cycles) is achieved due to the in situ morphological self-optimization and oxygen vacancy creation. Similarly, BiOCl@C anode also displays remarkable capacity and ultralong cycling stability (94%, 15000 cycles) due to the conductive and protective carbon layer, abundant reactive centers, and ion transport channels. Moreover, the in situ phase transition of BiOCl to Bi2O2CO3 also contributes to the outstanding stability. Our work provides rational guidance for architecting high capacitive and ultrastable anodes for aqueous rechargeable alkaline battery.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yuling Zhang,Juan Zhang,Qianying Yi,Fengliang Wang,Hongquan Fu,Hejun Gao,Yunwen Liao
Photocatalytic nitrogen fixation is considered as a multielectron reaction and a complex kinetic process, building high-performance nitrogen fixation photocatalysts to solve the activation of N2 and inhibit the recombination of photogenerated holes and electrons under the visible light condition. Herein, porous β-Bi2O3/BiOCOOH heterojunction photocatalysts with oxygen vacancies were prepared via BiOCOOH as a sacrificial precursor by the calcination method. The as-obtained β-Bi2O3/BiOCOOH catalyst with oxygen vacancies exhibited a high catalytic activity of about 65.56 μmol·g–1·h–1 for N2 fixation via deionized water as a solvent and methanol as a sacrificial agent. Both experimental and theoretical research indicated that the activity of β-Bi2O3/BiOCOOH heterojunction catalysts originated from the oxygen vacancies and lattice oxygen species. Compared to the single-component BiOCOOH structure, the porous β-Bi2O3/BiOCOOH heterojunction catalysts have achieved the absorption visible light range and have promoted the separation efficiency of charge carrier pairs by accommodating photogenerated electrons. Our findings afford a chance to improve a promising catalyst for photocatalytic nitrogen fixation.
研究领域:
材料科学
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催化化学
·
环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peng Zhang,Yongfang Rao,Yu Huang,Meijuan Chen,Tingting Huang,Wingkei Ho,Shuncheng Lee,Junbo Zhong,Junji Cao
The inevitable amorphous Bi 2 O 3 on the surface of plasmonic Bi nanospheres serving as the recombination center of hot electron-hole pairs, hindered the transfer of photo-generated hot electrons and production of reactive oxygen species (ROS) seriously. In this study, Bi@amorphous Bi 2 O 3 was transformed to Bi@crystal Bi 2 O 2 CO 3 by secondary hydrothermal reaction. Bi@Bi 2 O 2 CO 3 core–shell photocatalyst exhibited higher visible-light catalytic activity (34.1%) than Bi@Bi 2 O 3 did (12.3%) in terms of NO x removal. Photoelectrochemical, surface photovoltage spectroscopy spectra and Kelvin probe force microscopy measurement results indicate that Bi 2 O 2 CO 3 shell reduced the transmission resistance of hot electrons excited from Bi core. O 2 -TPD, trapping experiments and density functional theory further confirmed that the transferred hot electrons were a help for ROS generation and •O 2 − radicals were the major contributor. This study not only addresses the unsettled issue of surface amorphous Bi 2 O 3 , but also provides a facile method to transform the amorphous shell to crystal phase of core–shell photocatalyst and new insights into the hot electrons separation and the formation of main ROS over the surface crystal transition of plasmonic Bi.
研究领域:
材料科学
·
环境科学
·
化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Chunwen Chang,Qiang Xue,Rong Wang,Zeyu Liu,Yao Liu,Lin He,Fei Liu,Haijiao Xie
Development of an efficient monitoring technology for rapid detection of toxic Pb(Ⅱ) ion in water environments is extremely important. Here, a novel and highly sensitive sensor was prepared using one-step calcination technique, based on Bi 2 O 3 nanoparticles and carbonized metal–organic framework (MOF) nanocomposite. Scanning electron microscopy, transmission electron microscopy, contact angle and X-ray photoelectron spectroscopy characterization methods were used to analyze the morphology and structure of the prepared materials. Based on the electrical double-layer capacitance theory and Raman spectroscopy, changes to the active sites of different modified materials were investigated. Besides, differential charge densities and adsorption energies of the different modified materials in Zr-O clusters were calculated using density functional theory (DFT). A Bi 2 O 3 and carbonized UIO-66-NH 2 (Bi 2 O 3 /C-UIO-66-NH 2 ) -modified glassy carbon electrode was used to detect Pb(Ⅱ) by differential pulse anodic stripping voltammetry. Under optimal experimental parameters, the developed electrochemical sensor has a wide linear range (2–130 μg/L) and a low detection limit (0.05 μg/L). Meanwhile, the sensor has excellent stability, repeatability, and anti-interference properties and has been successfully applied to detect Pb(Ⅱ) in actual water samples. The results of this paper show that our developed sensor an efficient and rapid sensor technology for monitoring lead in water environment.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xin Xu,Shang Wu,Xin Sun,Shuo Tian,Chaoyang Liu,Penghui Zhang,Shuaishuai Fu,Yanbin Wang,Qiong Su,Xia Wang,Quanlu Yang
The rectangular nanorods microstructure with abundant pores can reduce structural damage caused by the volume contraction during charging-discharging processes and enhance the specific capacitance. In this work, to enhance the energy density and accelerate the marketable applications of supercapacitors , Bi 2 O 3 /BiFeO 3 rectangular nanorods with rich mesoporous structure derived from the iron‑bismuth based Prussian blue analogue are rationally designed to achieve a large specific capacitance through precipitation and annealing measures. There are a huge specific capacity of 741 F g −1 and long cycle life. The NiCo-LDH/rGO (954 F g −1 ) demonstrated an impressive stability of 86 % after 10,000 cycles and is utilized to establish asymmetric supercapacitor device. Amazingly, the NiCo-LDH/rGO//Bi 2 O 3 /BiFeO 3 device achieves an enormous energy density of 59.7 Wh kg −1 at 800 W kg −1 . In addition, the capacity retention ratio is 79.3 % after 7000 cycles. The work has suggested that Bi 2 O 3 /BiFeO 3 has great potential as a negative electrode of supercapacitors.
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高影响因子
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