APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Jian-guo Guo,Ying Liu,Ying-juan Hao,Yi-lei Li,Xiao-jing Wang,Rui-hong Liu,Fa-tang Li
Heterostructured Bi 3 O 4 Br/α-Bi 2 O 3 nanocomposites are prepared via in situ one-step self-combustion of ionic liquids. Tetrabutylammonium bromide (TBAB) is employed to be fuel, complexing agent for ionic liquids, as well as the reactant supplying Br for the objective material. The ratio of Bi 3 O 4 Br/α-Bi 2 O 3 can be easily adjusted by controlling the amount of TBAB. The heterojunctions show higher photocatalytic ability towards both azo dye methyl orange (MO) and colorless pollutant phenol . The electron spin resonance (ESR) test and p-nitro blue tetrazolium chloride (NBT) degradation result indicate that generation amounts of superoxide anion radicals ( O 2 − ) over heterojunctions are less than that over pure Bi 3 O 4 Br. Photoelectrochemical measurements show that separation efficiencies of photo-generated electrons and holes are decreased after the combination of Bi 3 O 4 Br and α-Bi 2 O 3 . Work function test and scavenger experiments display that holes play key role for pollutant degradation and the position of holes on α-Bi 2 O 3 is lowered via hybridization. Thus, the enhanced photocatalytic activity over composites can be attributed to the position decline of α-Bi 2 O 3 valence band, thus improving the reactivity of holes in direct oxidation of pollutants. In this case, valence band position is confirmed to be more important than separation efficiency of charge carriers in affecting photocatalytic performance.
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International Journal of Environmental Science and Technology
·
2024
·
IF 3
Dou W.,Song Y.,Zhang Y.,Liu T.,Kong L.,Hu X.,Li D.
Removal of chloride (Cl(− I)) and fluoride (F(− I)) ions is a major issue in metallurgical waste acid recycling. This study explored the synchronous and two-step precipitation approaches using bismuth oxide (Bi 2 O 3 ) to remove Cl(− I) and F(− I). Under the mole ratio of Bi 2 O 3 and halide ions at respectively 0.3 and 0.7 for the first and second steps, residual concentrations of Cl(− I) and F(− I) below 100 and 50 mg/L, respectively, were obtained, where the removal proportions of Cl(− I) and F(− I) in the first and second steps were respectively 1:1.1 and 1:3.3. During the treatment, Bi 2 O 3 was dissolved to produce Bi 3+ , which reacted with Cl(− I) first and then F(− I), leading to the precipitation of bismuth oxychloride and bismuth oxyfluoride. After the removal of Cl(− I) and F(− I), residual Bi 3+ was removed to a final concentration of 1.3 mg/L through introduction of hydrogen sulfide (H 2 S) and recovered as bismuth sulfide (Bi 2 S 3 ). In this method, approximately 97.6% of Bi 2 O 3 was regenerated, additionally, Cl(− I) and F(− I) were transferred to a NaOH/NaCl/NaF concentrate with minimal volume. This two-step approach for the removal of Cl(− I) and F(− I) using Bi 2 O 3 exhibited excellent performance in terms of high efficiency, high reagent recovery rate and low secondary pollution risk.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 2
·1-10
·
IF 2.8
Liu Longbin,Gao Wenkai,Kang Zeyu,Xi Chuying,Gao Shang,Tang Yu,Li Yongyan,Du Fengling,Yue Yunlong,Kang Junfeng
In this paper, alkali-free boroaluminosilicate glasses with low thermal expansion coefficient and low dielectric loss were prepared. The effect of Bi 2 O 3 substitution for CaO on structure, thermal expansion, elastic modulus, and dielectric properties of the samples was investigated by Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermal dilatometer, ultrasonic thickness gauge, and impedance analyzer. The results show that the polymerization degree of the glass network structure increases first and then decreases, which reaches the highest with the substitution of 0.5 mol% Bi 2 O 3 for CaO. The thermal expansion coefficient and dielectric constant decrease and then increase, while elastic modulus shows the opposite trend, which is attributed to the change in the glass network structure. The atomic mass of Bi much greater than that of Ca causes the obvious increase of glass density. The ionic radius of Bi 3+ ions is larger than that of Ca 2+ ions, making it more difficult to migrate through the glass network, reducing dielectric loss. In particular, the sample with 0.5 mol% Bi 2 O 3 substitution shows excellent properties, such as low thermal expansion coefficient (3.07 × 10 –6 /K), high elastic modulus (80.58 GPa), low dielectric constant (5.52), and dielectric loss (3.15 × 10 –3 ), which is very suitable for use as chip packaging material.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
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.
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RADIOCHIMICA ACTA
·
2021
·Vol. 110
·期 3
·193-203
·
IF 1.44
Wenhong Han,Guilin Wei,Yi Liu,Xirui Lu,Shunzhang Chen,Zhentao Zhang,Yi Xie,Xiaoyan Shu
A new glass solidification process aims at radioactive iodine waste was explored in order to reduce the possible harm to environment. Samples with different iodine content in silver-coated silica gel were pretreated by hydration device at 300 °C and then sintered at relatively low temperatures (500, 550 and 600 °C). XRD results show that AgI is mainly chemically fixed in the glass network with some AgI particles being physically wrapped by the glass. Moreover, as the sintering temperature reached to 550 °C, B element crystallized. SEM-EDS results show that Ag and I elements are enriched, while the other elements are evenly distributed. AFM results showed that the sample surface becomes rougher as the iodine content increases in the silver coated silica gel. The FT-IR results show that the structure of the sintered sample is mainly composed of [BiO 3 ], [BiO 6 ] and [BO 3 ]. This study provides a new sintering method by hydration device for the treatment of radioactive iodine waste.
研究领域:
材料科学
·
核废物处理
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Jiajun Wan,Jiyang Tian,Qian Zhang,Jie Liu
Developing renewable green energy is one of key approaches to achieve dual carbon goals, which is supported by high-efficiency energy storage technologies. Aqueous Zn-I 2 batteries (AZIBs) are quite promising grid energy storage systems due to their intrinsic safety and low cost, but are plagued by polyiodide shuttling and sluggish conversion kinetics. To tackle the issues, a binder-free Bi 2 O 3 @N-CNTs aerogel electrode with hierarchical pore structure has been developed, featured by Bi 2 O 3 nanoparticles embedded in the N-doped CNTs matrix. Removing of polymer binder not only reduces the inactive component in the electrode but also avoids covering active sites. Notably, polyiodide affinity and catalytic capability of novel Bi 2 O 3 electrocatalyst can be enhanced significantly via the formation of Bi–N bonds, which has been demonstrated by the X-ray photoelectron spectroscopy and systematic electrochemical tests. The resultant AZIB demonstrates superior cycling stability, maintaining a capacity of 148.7 mA·h·g −1 after 5,000 cycles with a high capacity retention of 87.1%. Specially, the high-loading pouch cell can also deliver a stable capacity of 2 mA·h over 40 cycles with an areal loading of 10 mg·cm −2 , highlighting the practicality of the Bi 2 O 3 @N-CNTs aerogel electrode.
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TRIBOLOGY INTERNATIONAL
·
2026
·
IF 7.6
Qingqing Zhang,Junhong Jia,Runze Wei,Xiaoyu Jiao,Nairu He,Jie Yang,Haichao Zhao,Dongshen Li
NiCrAlY-based composite coatings with 10–30 wt% MoO 3 -Bi 2 O 3 (1:1) were fabricated by atmospheric plasma spraying (APS) for high-temperature self-lubrication. Their tribological behaviors against GH5188 superalloy were evaluated from room temperature (RT) to 800 ℃. While both porosity and microhardness increased with oxide content, the 20 wt% coating (NMB2) exhibited optimal overall performance, achieving a minimum friction coefficient of 0.28 and a wear rate of 2.84 × 10 −5 mm 3 /(N·m) at 800 ℃. At elevated temperatures, lubricating oxides such as NiMoO 4 and CoMoO 4 formed on the wear surface. Concurrently, Co and W from the GH5188 counterpart oxidized and transferred, contributing to a stable composite tribofilm. This synergistic film effectively reduced friction and wear, identifying the NMB2 as a promising protective solution for high-temperature reciprocating components in aerospace applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jin Qin,Shangshi Ye,Kai Yan,Jingdong Zhang
A visible light-driven photoelectrocatalytic system was constructed based on Bi/Bi 2 O 3 /TiO 2 nanotubes (NTs) to treat wastewater containing oxytetracycline and Cu 2+ mixed pollutants. The surface morphology , crystal phase, elemental composition , light absorption property and photoelectrochemical activity of the synthesized Bi/Bi 2 O 3 /TiO 2 NTs were investigated. The composite film , Bi/Bi 2 O 3 /TiO 2 NTs was used for the photoelectrochemical removal of oxytetracycline, and it had excellent visible light photoelectrocatalytic performance. Under optimal conditions, the composite film was simultaneously used to remove coexisting oxytetracycline-Cu 2+ . The study results show that the reduction of Cu 2+ on cathode was promoted by oxytetracycline while the degradation of oxytetracycline on photoanode was slightly suppressed by Cu 2+ . Also, possible photoelectrocatalytic degradation pathways for oxytetracycline-Cu 2+ were analyzed by HPLC-MS.
研究领域:
环境科学
·
材料科学
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Science Bulletin
·
2025
·
IF 21.1
Han-Yue Yang,Bin Sun,Xue Xiao,Xuan Ai,Rui-Bin Jiang,Pei Chen,Yu Chen
Glycerol, a byproduct of biodiesel production, can be efficiently converted into valuable chemicals through electrocatalytic reaction. In this study, platinum (Pt) nanocrystals decorated on bismuth oxide (Bi 2 O 3 ) nanosheets (PtBi DONS) with an optimal Pt:Bi ratio of 1:1 were successfully synthesized using a galvanic replacement method. Pt 1 Bi 1 DONS exhibit remarkable electrocatalytic performance for glycerol electrooxidation, achieving an excellent catalytic activity (current of 0.82 A mg Pt –1 at 0.67 V vs. reversible hydrogen electrode (RHE)) and an exceptional selectivity of 96.6% for C 3 products, particularly glyceric acid. The superior performance stems from two key factors: (1) electron transfer from Bi 2 O 3 to Pt creates electron-rich Pt sites that suppress C–C bond cleavage and (2) Bi 2 O 3 facilitates favorable glycerol adsorption configurations through multiple hydroxyl group interactions. Mechanistic studies using operando spectroscopy and electrochemical impedance spectroscopy revealed that the synergistic effect between Pt and Bi 2 O 3 promotes rapid charge transfer and stable intermediate formation. Moreover, PtBi DONS showed excellent versatility in oxidizing other polyols compared with monoalcohols.
研究领域:
化学工程
·
材料科学
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 5
·1901486
·
IF 3.217
Xiangyan Feng,Yuanyuan Lv,Lan Zhang,Jianjun Ding,Jun Sun,Xiaoxiao Li,Lin Chen,Kang Zheng,Xian Zhang,Xingyou Tian
With the rapid development of microelectronic information technology, high-power electronic devices require high heat dissipation. Herein, the preparation of low-temperature cofired ceramic (LTCC) applications with excellent thermal conductivity and dielectric properties is focused. B 2 O 3 –Bi 2 O 3 –SiO 2 –ZnO (BBSZ) glass/Al 2 O 3 /BN green sheets are prepared by tape casting and sintered at 850 °C. The crystal phase composition, microstructure, thermal conductivity, thermal expansion coefficient, and dielectric properties of LTCC are investigated. It is shown that nanoscale rod crystals ZnAl 2 O 4 and Bi are formed in the composite. The generated nanoscale rod crystals build a 3D heat conduction channel in the composite. The thermal conductivity of the sintered sheet with 20 wt% BN is 5.165 W m −1 K −1 . The sintered sheet containing 20 wt% BN has a low coefficient of thermal expansion (2.92 ppm °C −1 ) matched well with silicon and excellent dielectric properties ( ε r = 3.9672, tan δ = 1.49 × 10 −3 ) at 20 GHz. This material has great potential applications in electronic devices.
研究领域:
材料科学
·
电子材料
·
陶瓷
·
微电子
·
热管理
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xiaoting Zhang,Bin Cui,Yu Qiu,Rong Ma,Yueyao Fan
In this paper, morphology engineering was developed to optimize the overall temperature-stable energy storage performance of ceramic capacitors. First, SrSn 0.1 Ti 0.9 O 3 (SST) particles were coated on Na 0.5 Bi 0.5 TiO 3 (NBT) rods to form "core-shell" NBT@SST rods by a co-precipitation method to improve the relaxor behavior. And the rods were compounded with the Bi 2 O 3 -B 2 O 3 -SiO 2 (BBS) glass to dense into NBT@SST-BBS composites. The nanorods morphology of ceramic grains can increase the charge storage sites to induce higher polarization value. The moderate- ε r SST shell with highly lattice matching could lower the interfacial polarization between ceramic and glass phase so as to boost the breakdown strength. Comparatively, composites with nanorod morphology can reach the highest recoverable energy density of 2.19 J/cm 3 at 229 kV/cm with superior temperature stability ( Δε/ε 150 ° C ≤ 15% at 30–395 °C). We hope this work will give guidance to fabricate the next-generation dielectric capacitors through morphology engineering.
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BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Xiao Chen,Wenqin Wu,Qi Zhang,Cheng Wang,Yingying Fan,Huimin Wu,Zhaowei Zhang
Designing a photoelectrochemical (PEC) biosensor with preponderant sensitivity and anti-interference is a challenge for detecting small molecules in real samples with complex matrices . To this end, the Bi 2 O 3 /CuBi 2 O 4 was synthesized in one step to enhance visible light's absorption ability, transferring the interfacial carrier's efficiency, a high-active Z-scheme heterojunction , and a photocathode biosensor was proposed. For the first time, we used the density functional theory to verify a Z-scheme transfer pathway of photogenerated electrons in Bi 2 O 3 /CuBi 2 O 4 and the energy band structure of Bi 2 O 3 and CuBi 2 O 4 , respectively. Bi 2 O 3 /CuBi 2 O 4 -based PEC biosensor was developed for competive immunoassay of small molecular, aflatoxin B1 (AFB1) as an example, resulting in a low detection limit of 297.4 fg/mL and a linear range of 1.4 pg/mL-280 ng/mL in urine, water, peanut, and wheat samples. Using spiked experiments, the satisfied repeatability, reproducibility, stability, and specificity of the Bi 2 O 3 /CuBi 2 O 4 -based PEC biosensor indicated a promise for application in health care, the environment, and food.
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