PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2023
·Vol. 25
·期 19
·13474-13486
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IF 3.3
Xin Guan,Xiao-li Wang,Xue-wen Zhu,Hui Yu,Ming Yang,Xiang-ting Dong,Ying Yang,Long Xia
β-Bi2O3 demonstrates excellent photocatalytic activity under visible light, but it has a very high photogenerated e−–h+ recombination rate and quite low quantum efficiency. AgBr also shows excellent catalytic activity but Ag+ is easily reduced to Ag under light radiation, which limits its application in the photocatalysis field, and there are few reports about the application of AgBr in photocatalysis. In this study, the spherical flower-like porous β-Bi2O3 matrix was first obtained, and then the spherical-like AgBr was embedded between the petals of the flower-like structure to avoid direct light radiation. The only light through the pores on the β-Bi2O3 petals could be transmitted onto the surfaces of AgBr particles to form a nanometer point light source, which photo-reduced Ag+ on the surface of the AgBr nanospheres to construct the Ag-modified AgBr/β-Bi2O3 embedded composite and a typical Z-scheme heterojunction was constructed. Under this bifunctional photocatalyst and visible light, the RhB degradation rate reached 99.85% in 30 min, and the photolysis water hydrogen production rate reached 6.288 mmol g−1 h−1. This work is as an effective method for not only the preparation of the embedded structure, quantum dot modification and flower-like morphology but also for the construction of Z-scheme heterostructures.
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Nanomaterials
·
2023
·Vol. 13
·期 5
·915
·
IF 5.3
Jing-Jing Yang,Ying-Zhuo Shen,Zheng Wang,Bo Zhou,Xiao-Ya Hu,Qin Xu
In this study, β-Bi2O3nanosheets functionalized with bisphenol A (BPA) synthetic receptors were developed by a simple molecular imprinting technology and applied as the photoelectric active material for the construction of a BPA photoelectrochemical (PEC) sensor. BPA was anchored on the surface of β-Bi2O3nanosheets via the self-polymerization of dopamine monomer in the presence of a BPA template. After the elution of BPA, the BPA molecular imprinted polymer (BPA synthetic receptors)-functionalized β-Bi2O3nanosheets (MIP/β-Bi2O3) were obtained. Scanning electron microscopy (SEM) of MIP/β-Bi2O3revealed that the surface of β-Bi2O3nanosheets was covered with spherical particles, indicating the successful polymerization of the BPA imprinted layer. Under the best experimental conditions, the PEC sensor response was linearly proportional to the logarithm of BPA concentration in the range of 1.0 nM to 1.0 μM, and the detection limit was 0.179 nM. The method had high stability and good repeatability, and could be applied to the determination of BPA in standard water samples.Keywords:β-Bi2O3;nanosheet;PEC sensor;bisphenol A;molecularly imprinted
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
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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SCIENCE OF THE TOTAL ENVIRONMENT
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2018
·
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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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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RSC Advances
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2023
·Vol. 13
·期 5
·2993-3003
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IF 3.9
YiZhi Zeng,Feng Zhou,Yuan Gao
In the present research, the preparation process parameters of TiO2 nanotube arrays (TNAs) prepared by anodic oxidation were systematically studied by the orthogonal experimental method for the first time. Herein, the parameters of nine factors were optimized; the optimal parameters were: the electrolyte was a 0.2 mol L−1 NaF solution with 3% vol H2O at pH 7, the anodic oxidation voltage was 40 V, the electrode spacing was 4 cm and the reaction was carried out for 60 minutes. The physicochemical properties of the materials were characterized by SEM, XRD, EDS, UV-vis, and PL spectroscopy. By electrodeposition of Bi2O3 modified TNAs, the degradation rate of unsymmetrical dimethylhydrazine (UDMH) wastewater on the TNAs-10 was 89.14% within 10 h, which was 2.69 times that on pure TNAs. A bias potential of +0.3 V (vs. open circuit potential) was applied to the modified TNAs-10. The degradation rate of UDMH was significantly enhanced on the TNAs-10 (bias) process as compared to the TNAs-10 process. The degradation rate of UDMH wastewater on TNAs-10 (bias) exhibited an exponential distribution. UDMH and its toxic by-products FDMH, NDMA were completely degraded after 8 h.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Lianyun Cheng,Yanwei Li,Guang Sun,Jianliang Cao,Yan Wang
With the growing concern on environment protection, fast and selective detection of various harmful gases with the sensors based on metal oxide semiconductor (MOS) has stimulated increasing interest. However, the unsatisfied gas sensing performance of pure MOS hinders its practical application. In this paper, we propose a Bi 2 O 3 -ZnO heterojunction strategy to upgrade the performance of ZnO sensor to realize ultrafast detection of triethylamine (TEA) with high sensitivity and selectivity. To expound it, nanoscale Bi 2 O 3 -ZnO p-n heterojunctions were uniformly modified on the ZnO porous nanosheets-assembled architecture (PNSA) via an impregnation, freeze-drying and calcination method by using self-made Zn 5 (CO 3 ) 2 (OH) 6 as precursor. The obtained Bi 2 O 3 /ZnO PNSAs are about 7 µm in size, in which the thickness of porous nanosheets is around 25–38 nm. Impressively, compared with the sensor based on pure ZnO PNSA, the Bi 2 O 3 /ZnO PNSA sensor exhibited remarkably boosted triethylamine (TEA) sensitive performances, especially of faster response speed (<1 s for 100 ppm TEA), better selectivity (S TEA/toluene = 406.013) and higher sensitivity (26.886/ppm for 1–100 ppm TEA). The sensitization mechanisms of Bi 2 O 3 -ZnO heterojunction on ZnO PNSAs was discussed in detail.
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Journal of Nanostructure in Chemistry
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2022
·Vol. 13
·期 5
·481-495
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IF 8
Jia Zi-ang,Zeng Qing-rui,Sun Yuan-bo,Feng Wei
A novel three-dimensional spherical LaFaO 3 /Bi 2 O 3 heterojunction was successfully constructed through a two-step synthesis, which included a biological template method and hydrothermal synthesis. Because of the addition of different quantities of LaFaO 3 , the as-prepared LaFaO 3 /Bi 2 O 3 composite showed different morphological structures, excitation energies, charge separation efficiencies, and degrees of photocatalytic performance. With the change in the amount of LaFaO 3 added, the morphology of the LaFaO 3 /Bi 2 O 3 complex changed from irregular clusters to a regular spherical structure. When the molar doping ratio of LaFaO 3 /Bi 2 O 3 was 1:2, it exhibited a near-perfect 3D spherical structure with external pyknotic grooves. The results of electrochemical impedance spectroscopy indicated that the 1:2 LaFeO 3 /Bi 2 O 3 catalyst exhibited the optimal charge separation efficiency. The bandgap of the prepared LaFaO3/Bi 2 O 3 composite changed from 1.95 eV (1:2) to 2.32 eV (3:4), which were lower than that of the Bi 2 O 3 template (2.81 eV). The 3D-spherical LaFaO 3 /Bi 2 O 3 catalyst almost completely removed 50 mg L −1 of tetracycline within 90 min. Electron spin resonance and radical trapping experiments revealed that radicals were the main oxidants in the photocatalytic reaction. The construction of a 3D floral spherically structured semiconductor composite photocatalyst improved the further degradation of tetracycline. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 6
·4265-4282
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IF 4.682
Hu Wenna,Wu Fan,Liu Wei
The objective of this study was to construct the S-scheme Bi 2 WO 6 / α- Bi 2 O 3 heterojunctions with high enhanced visible-light photocatalytic performance. The composites loaded various Bi 2 WO 6 mass ratios were prepared by a ball grinding method. The characterization and reaction mechanism of photocatalysts were explored in detail. Remarkably, the results demonstrated that the Bi 2 WO 6 / α- Bi 2 O 3 presented an outstandingly superior performance for photodegradation of nitrobenzene. Among them, the 10%Bi 2 WO 6 / α- Bi 2 O 3 possessed the best photocatalytic property, and it could reach up to 95.7% in 50 min with the top rate constant of 0.06178 min −1 , which was 4.3 and 3.6 times that of bare Bi 2 O 3 and Bi 2 WO 6 , respectively. Simultaneously, the Bi 2 WO 6 / α- Bi 2 O 3 was well stable after five cycling experiments. The efficiently improved photocatalytic performance was primarily attributed to the formation of S-scheme structure between Bi 2 WO 6 and α- Bi 2 O 3 , which enhanced the conspicuous separating efficiency of photogenerated carriers. The present study not only offers a method to solve the unsatisfactory activity of Bi 2 O 3 , but also provides some insights into the design of other novel S-scheme composites with great potential application in clean energy and environmental remediation. Graphical abstract The efficiently improved photocatalytic performance was primarily attributed to the formation of S-scheme structure between Bi 2 WO 6 and α- Bi 2 O 3 , which enhanced the conspicuous separating efficiency of photogenerated carriers.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 14
·3578-3589
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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.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Rui Yu,Yanling Yang,Zhiwei Zhou,Xing Li,Jingfeng Gao,Nan Wang,Jiaqi Li,Yongwang Liu
In this work, a novel ternary heterojunction composite with bismuth oxide (Bi 2 O 3 ), titanium dioxide (TiO 2 ) and reduced graphene oxide (rGO) was produced via a one-step hydrothermal process. The prepared Bi 2 O 3 /rGO/TiO 2 (BRGT) composite possessed a strong visible-light responsiveness and a high separation efficiency of photogenerated carriers, with a specific surface area of 133.1 m 2 /g. The optimal degradation performance towards tetracycline (94.3% removal) was obtained by BRGT-10 with Bi/Ti molar ratio of 10% and mass ratio of graphene oxide/Ti of 5% following conditions of 0.1 g/L BRGT-10 at pH of 6.7. The degradation rate of tetracycline by BRGT was 4.5, 3.8, 1.4, and 1.28 times that of TiO 2 , TiO 2 /rGO, Bi 2 O 3 /TiO 2 , and Bi 2 O 3 /TiO 2 @rGO, respectively. O 2 − radicals and holes play the dominant roles in the photodegradation of tetracycline. Based on density function theory calculation and liquid chromatography-mass spectrometry identification of intermediates, the degradation pathways of tetracycline were mostly attributed to the breakage of carbon-carbon double bonds, nitrogen-carbon bonds and rearrangement of hydroxyl groups, and the decreased toxicity of the formed intermediates was evaluated. The BRGT-10 composite owned optimal reusability and applicability. This study explores a facile synthesis process of ternary heterojunction composite and provides insights into photodegradation mechanism of refractory organics from water under visible-light.
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JOURNAL OF SOLID STATE CHEMISTRY
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2022
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IF 3.656
Lei Huai,Lu-Nan Zhang,Bei-Bei Zhang,Guangan Jia,Wen-Dong Yao,Wenlong Liu,Ru-Ling Tang
Inorganic oxide crystalline materials have been attractive owing to unusual structural and physical properties including superconductivity , nonlinear optics, photocatalytic degradation, molecular sieve and solar cells. Herein, a new molecule-inclusion strontium gallate , Sr 6 (Ga 12 O 24 )·Bi 2 O 3 , has been obtained by solid-state method. The compound crystallizes in the centrosymmetric space group R 3 ¯ (no. 148), and exhibits a three-dimensional network structure composed by corner-sharing connected GaO 4 tetrahedra and edge-sharing connected SrO 9 polyhedra with Bi atoms located in hexagonal tunnels. Spectral analysis shows that the compound exhibits strong Raman peak. Synthesis, crystal structure, versatile characterizations as well as theory calculations of Sr 6 (Ga 12 O 24 )·Bi 2 O 3 are presented in this work.
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