ACS Applied Nano Materials
·
2024
·
IF 5.3
Xia Cheng,Xinyan Xiao,Fei Wang,Ting Lu,Yu Zhang
Photocatalysis is extensively implemented in organic pollutant degradation, and the critical point is to develop outstanding and stable photocatalysts. Herein, the synthesis of coral reef-like α-Bi2O3/BiOBr heterostructure photocatalysts involves the in situ growth of BiOBr nanosheets onto α-Bi2O3, with the latter derived through calcination utilizing a bismuth-based metal–organic framework (CAU-17) as the precursor. Under simulated sunlight, the 20% α-Bi2O3/BiOBr heterojunction degraded nearly 97.7% of RhB in 60 min, while pure α-Bi2O3 and BiOBr nanosheets degraded only 7.8 and 65.3%, respectively. Furthermore, the 20% α-Bi2O3/BiOBr nanocomposite exhibited superior recycling stability, degrading 86.6% RhB after four cyclic experiments. This is attributed to the fact that the nanoscale α-Bi2O3 material obtained by calcination can retain the exoteric diffusion channels of CAU-17, making α-Bi2O3/BiOBr heterojunctions have an enormous specific surface area, providing more adsorption sites and promoting their photocatalytic capacity. Free radical capture tests and electron paramagnetic resonance measurements indicated that h+ and •O2– were the primary active substances during photodegradation. On the basis of that, a feasible photodegradation mechanism of type II α-Bi2O3/BiOBr heterojunctions was proposed. This study opens up the possibility of designing type II heterojunctions with MOFs as precursors for dye degradation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 28
·期 10
·4769-4777
·
IF 2.961
Chang Xueyi,Qiu Yongfu,Cheng Zhiyu,Wang Xiaoting,Zhong Qingpeng,Huang Huizhen
To improve the specific capacitance of supercapacitor with bismuth oxide, this paper reports hollow nanosheet-assembled α-Bi 2 O 3 spheres prepared by solvothermal method as novel electrode materials. The electrochemical results show that the hollow nanosheet-assembled α-Bi 2 O 3 spheres exhibited a high electrochemical performance with a maximum specific capacitance of 1380.2 F g −1 at a current density of 1 A g −1 , which is the highest specific capacitance achieved to date with bismuth oxide as electrode material, and remarkable rate capability of 84.1% when the current density increased to as high as 15 A g −1 . The reasons for the high capacitance performance of the product are due to the monoclinic α-Bi 2 O 3 with a stable phase and more ion channels to transport and store ions, as well as the hollow spherical structure with porosity, which makes the material fully utilized. In a word, Bi 2 O 3 should be as a promising candidate towards high-performance electrode for pseudocapacitive supercapacitor.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 7
·2310-2321
·
IF 4.029
Lianwei Shan,Yuteng Liu,Hongtao Chen,Ze Wu,Zhidong Han
We prepared an α-Bi2O3/BiOBr core–shell heterojunction via a facile in situ chemical transformation method. Ultrathin BiOBr nanosheets were observed and these were found to be evenly distributed on the surface of α-Bi2O3/BiOBr by SEM and TEM. The results revealed that the prepared α-Bi2O3/BiOBr photocatalysts were porous, and their specific surface areas were found to be raised on comparing with α-Bi2O3 and BiOBr. In our experiments, the photocatalytic activity of α-Bi2O3 was obviously enhanced when assembling with ultrathin BiOBr compared with α-Bi2O3/BiOBr and the individual phase. It is considered that the surface porous structure increases the specific surface areas, which improved the adsorption characteristics of α-Bi2O3/BiOBr. The suitable band alignment (between α-Bi2O3 and BiOBr) and oxygen vacancy effect can be attributed to the increased photocatalytic activity under visible irradiation.
研究领域:
材料科学
·
物理化学
·
纳米科技
·
催化化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 3
·1594-1605
·
IF 3.9
Baikang Zhu,Qinbing Dong,Jianghua Huang,Debin Song,Lihui Chen,Qingguo Chen,Chunyang Zhai,Bohong Wang,Jiří Jaromír Klemeš,Hengcong Tao
To improve the efficiency of photocatalytic oxidative degradation of antibiotic pollutants, it is essential to develop an efficient and stable photocatalyst. In this study, a polymer-assisted facile synthesis strategy is proposed for the polymorph-controlled α-Bi2O3/Bi2O2CO3 heterojunction retained at elevated calcination temperatures. The p–n heterojunction can effectively separate and migrate electron–hole pairs, which improves visible-light-driven photocatalytic degradation from tetracycline (TC). The BO-400@PAN-140 photocatalyst achieves the highest pollutant removal efficiency of 98.21% for photocatalytic tetracycline degradation in 1 h (λ > 420 nm), and the degradation efficiency was maintained above 95% after 5 cycles. The morphology, crystal structure, and chemical state of the composites were analysed by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Ultraviolet-visible diffuse reflection, transient photocurrent response, and electrochemical impedance spectroscopy were adopted to identify the charge transfer and separation efficiency of photogenerated electron–hole pairs. The EPR results verified h+ and ˙OH radicals as the primary active species in the photocatalytic oxidation reactions. This observation was also consistent with the results of radical trapping experiments. In addition, the key intermediate products of the photocatalytic degradation of TC over BO-400@PAN-140 were identified via high-performance liquid chromatography-mass spectrometry, which is compatible with two possible photocatalytic reaction pathways. This work provides instructive guidelines for designing heterojunction photocatalysts via a polymer-assisted semiconductor crystallographic transition pathway for TC degradation into cleaner production.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lu Chen,Zhengkai Wu,Xueying Cheng,Shuyu Chen,Jiaxin Zhao,Hang Li,Yingna Guo,Qingkun Shang
In this paper, Bi 4 O 5 I 2 /α-Bi 2 O 3 composite photocatalysts were successfully prepared by loading Bi 4 O 5 I 2 nanosheets on the surface of α-Bi 2 O 3 nanorods. The photocatalytic performance was investigated for the degradation of propranolol under visible light. Bi 4 O 5 I 2 /α-Bi 2 O 3 (30) could degrade 95 % of propranolol within 120 min, and the degradation rates of propranolol were 64.3 and 2.68 times that of α-Bi 2 O 3 and Bi 4 O 5 I 2 , respectively. The mineralization degree of propranolol reached 54.7 %, which was also much higher than that of Bi 4 O 5 I 2 and α-Bi 2 O 3 alone. Based on the results of high-resolution mass spectrometry (HRMS), the possible degradation pathways and products of propranolol were proposed, and the environmental toxicity of the degradation products was evaluated. The formation mechanism of Bi 4 O 5 I 2 /α-Bi 2 O 3 Z-type heterojunction was proposed by investigating the band structure and photoelectric properties of the composite photocatalyst. This work provides a successful example for the construction and application of new heterojunction photocatalysts.
研究领域:
环境科学
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 117
·96685-96694
·
IF 3.84
Feng Ding,Sizhao Zhang,Xuegang Luo,Xiaoyan Lin
The treatment of organic dyes is often conducted using the photocatalytic technique, however, the necessity for ultraviolet irradiation and efficient degradation still limit its wide practical application. Here, we report on a facile and effective co-precipitation hydrothermal method for fabricating Ag3PO4/α-Bi2O3 (AB) hierarchical heterostructures with an improved visible-light response. Rod-like α-Bi2O3 was firstly prepared under hydrothermal conditions, and then silver nitrate and disodium hydrogen phosphate were successively added to form AB. The measurement results signify that heterojunctions of polyhedral Ag3PO4 adhered to rod-like α-Bi2O3 were apparently found. AB possesses a markedly enhanced photocatalytic performance and outstanding ability in decomposing methylene blue (MB), methyl orange (MO) and rhodamine B (RhB) under visible light, compared to pure α-Bi2O3 or Ag3PO4. The amount of silver ions released reveals that the formation of α-Bi2O3 could enhance the stability of the AB composites. The fluorescence tests indicate that AB is helpful in producing the ˙OH radicals responsible for enhanced photocatalytic activity. The degradation rate could be maintained even after three degradation cycles, suggesting an admirable chemical and physical stability of AB. In addition, a possible mechanism for the enhanced photocatalytic properties of AB was also discussed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yuanwen Hou,Jia Tang,Li Jiang,Ning Xie,Hongquan Fu,Juan Zhang,Hejun Gao,Bin Xu,Yunwen Liao
Piezocatalytic technology represents an innovative form of advanced oxidation technology for degradation of organic pollutants. Piezoelectric catalysis technology combines electrochemistry and piezoelectric properties, and promotes charge transfer through a piezoelectric field, thus promoting catalytic reactions. This study employed a one-step microwave method to fabricate an α-Bi2O3/BiO2 heterojunction with a narrow bandgap. This catalyst exhibited a high efficiency in the degradation of methyl orange dye, achieving a removal rate of 93% in 60 minutes, with a reaction rate constant of 0.0324 min−1. The investigation of the catalytic mechanism demonstrates that the construction of the α-Bi2O3/BiO2 heterojunction facilitates the separation of charge carriers, increases the degree of polarization, and consequently enhances the efficiency of piezoelectric catalytic degradation. This work opens the way for the design and development of high-performance piezoelectric catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yuxuan Ke,Shuzhen Chen,Suisui Su,Jiao Zhang,Shenghua Hu,Cuiqing Zhang,Changyuan Hu,Shizheng Zheng
Bi 2 O 3 has been recognized as a promising anode of aqueous secondary battery because of the high capacity, but the application is greatly hindered by the poor conductivity and limited actual capacity. Herein, for the first time, one dimensional (1D) α-Bi 2 O 3 nanobelt is fabricated via alkali etching strategy using rod-shaped Bi-MOF (CAU-17) as the self-sacrificial template. Specifically, high-crystalline and oxygen-deficient α-Bi 2 O 3 nanobelt with length and width of 6 μm and 300 nm are identified. The electrochemical results demonstrate the high specific capacity (247 mAh g −1 @1 A g −1 ) and acceptable stability of α-Bi 2 O 3 nanobelt. Such superior capacity is derived from the exposed electrochemical active sites, fast charge transfer and efficient ion diffusion in 1D high-crystalline and oxygen-vacancies enriched structure. The assembled Ni-Bi battery displays high capacity (78.3 mAh g −1 ) and high energy density of 100.2 Wh kg −1 (at power density of 2829.8 W kg −1 ). Our work provides rational guidance for architecting 1D high-capacitive electrodes for aqueous rechargeable alkaline battery.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Shui Tuan Lin,Lian Wei Shan,Cheng Guo Ma,Ming Qi Yuan,Zi Lan Fang,Yan Wei Xiao,Li Min Dong,Dan Li,Ying Kui Guo
Heterojunction semiconductor photocatalysis is an auspicious technique for clear up organic pollutants from water, and have been of valuable strategy in the area of photocatalysis. Herein, electrophoretic deposition procedure was used to prepare α-Bi2O3/CdS type-Ⅱ heterojunction photocatalysts. The results of PL, Raman, and EIS show that there is a heterojunction effect in α-Bi2O3/CdS, which is propitious to improve the separation efficiency of photogenerated electron-hole pairs. The DFT calculation reveals that the work function of CdS (4.57 eV) is higher than that of α-Bi2O3 (3.37 eV), which facilitates the migrating of e- from the CB of α-Bi2O3 to the CB of CdS, and the migrating of h+ from the VB of CdS to the VB of α-Bi2O3, thus the e--h+ pairs with high redox ability are retained. The performances were assessed by degrading methyl orange (MO), acid magenta under simulated visible light irradiation. Under simulated visible light irradiation, BC45 composite exhibited the highest degradation efficiency of 87% (MO) and 81% (acid fuchsin) for 4 h, which was about 2 times higher than that of CdS (MO) and (acid fuchsin). It is believed that the dual characteristics of H2O wettability and dye adsorption performance in α-Bi2O3/CdS composites promote photocatalytic process compared with single CdS and α-Bi2O3. The study could provide new insights to develop efficiently capable photocatalysts of the α-Bi2O3/CdS composites.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 14
·3578-3589
·
IF 7.779
Jie-hao Lia,Rui-hong Liu,Meng Ning,Yi-lei Li,Ying Liu,Xinying Liu,Phathutshedzo Khangale,Diane Hildebrandt,Xiao-jing Wang,Fa-tang Li
Constructing heterostructured photocatalysts will generally improve the separation efficiency of photo-induced carriers; however, the change in the energy band position that affects their redox ability has received little attention. In this work, α-Bi2O3/Bi5NO3O7 heterojunctions are prepared via solution combustion synthesis and characterized by UV-vis DRS, Mott–Schottky and Kelvin probes, and the band structures of α-Bi2O3 and Bi5NO3O7 before and after the formation of the heterojunction are obtained. The results of the degradation of rhodamine B and tetracycline indicate that the main active species are holes and superoxide anion radicals, respectively. Although separation efficiency over heterojunctions is higher than that over individual Bi5NO3O7 and α-Bi2O3, lower degradation ability is observed. The reason is that the heterojunction formation causes an upward shift of the valence band of Bi5NO3O7 and a downward shift of the conduction band of α-Bi2O3, which reduces the oxidation ability of holes and the ability to activate molecular oxygen, respectively. The decrease in the redox ability outweighs the positive impact of enhanced separation efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）