JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Shipeng Liao,Muhammad Arif,Xingyue Qian,Guangyu He
The development of hybrid heterostructure photocatalysts with enhanced visible light absorption capacity holds significant importance in environmental remediation. However, the challenge persists in exploiting strong visible-light responsive photocatalysts with both high efficiency and stability. Herein, we successfully synthesized a hybrid Z-scheme heterojunction of Bi 2 O 3 and UiO-66-NH 2 (Bi 2 O 3 /UiO-66-NH 2 ) through a simple hydrothermal route. The visible light photocatalytic performance of Z-scheme Bi 2 O 3 /UiO-66-NH 2 heterojunction is systematically evaluated for persistent antibiotic tetracycline hydrochloride (TC-HCl) both in the clean and real water matrix. All heterojunction catalysts exhibit superior photodegradation capabilities compared to pristine Bi 2 O 3 and UiO-66-NH 2 . The optimal ratio of the two components heterojunction (BUN-150), in particular, demonstrates the highest removal efficiencies for TC-HCl (95 %) within a 90-min timeframe. This remarkable photocatalytic performance is credited to the Z-scheme charge transfer occurring at the interface of Bi 2 O 3 and UiO-66-NH 2 in Bi 2 O 3 /UiO-66-NH 2 heterojunction. The active species experiments and electron paramagnetic resonance analyses are conducted to identify the active reactive species during the TC-HCl degradation (·OH, h + , and ·O 2 − ), and a precise photocatalytic degradation mechanism is explained. Additionally, the photodegradation intermediates of TC-HCl are detected using the HPLC-MS analysis to explain the degradation pathways of TC-HCl. This research paves the way for the development of novel Z-scheme Bi 2 O 3 -based heterojunction catalysts for outstanding photocatalytic applications.
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Nano Energy
·
2024
·
IF 16.8
Yang Wang,Chaogang Ban,Yajie Feng,Jiangping Ma,Junjie Ding,Xiaoxing Wang,Lujie Ruan,Youyu Duan,Mikhail G. Brik,Liyong Gan,Xiaoyuan Zhou
Rational design of highly efficient photocatalysts for CO 2 conversion into carbonaceous fuels is of great significance to mitigate the global greenhouse effect and energy shortage problem. Among numerous materials studied for this purpose, the carbon nitride (g-C 3 N 4 ) has been widely used in photocatalytic CO 2 reduction (PCR) due to its decent optical properties, low cost and environment friendliness. However, its wide use still remains a substantial challenge due to inefficiency of the active site and rapid recombination of photogenerated electrons and holes. Herein, we suggest a Z-scheme system of nitrogen vacancies g-C 3 N 4 /β-Bi 2 O 3 heterojunction photocatalyst based on self-assembly of nitrogen vacancies in g-C 3 N 4 nanosheets and β-Bi 2 O 3 micro-flowers, yielding an enhanced CO evolution rate of 30.56 μmol·g −1 ·h −1 under the simulated solar light without any cocatalysts and sacrificial agents. Our detailed studies indicate that the promoted PCR performance originates from the stronger adsorption capability of the *COOH intermediates due to the cleavage of the C-C bond in nitrogen vacancies g-C 3 N 4 (N V -C 3 N 4 ), turning the most endothermic step from the formation of *COOH intermediates to *CO. Moreover, the unique Z-scheme feature can efficiently facilitate the separation of photoelectron-hole pairs and enhance redox capability by optimizing the energy band structure. To sum up, this work provides deep insights and guidelines for rational design of highly efficient Z-scheme heterojunctions catalysts for CO 2 photoreduction to solar fuels.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhengjie Su,Xinru Wu,Dong-Hau Kuo,Baoqian Yang,Binghong Wu,Longyan Chen,Pengkun Zhang,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, an Ag/S co-doped Bi2O3-based sulfur oxide catalyst was prepared via a facile green method. The Ag/S–Bi2O3 catalyst with suitable Ag/S doping demonstrated super visible light photocatalytic hydrogen evolution (PHE) at 7.52 mmol g−1 h−1, with an apparent quantum efficiency (AQE) of 8.67% at 420 nm. Ag/S co-doping can adjust the energy band structure of an oxidation type Bi2O3 catalyst, converting it into a visible light hydrogen production catalyst suitable for hydrogen production. Sulfur doping adjusts the content of oxygen vacancies to enhance the surface active sites, and the introduction of noble metal silver endows the catalyst with more excellent electrical conductivity and electron trapping ability. Thus, Bi2O3 with Ag/S co-doping produced a suitable energy band structure, enhanced the content of oxygen vacancies and the number of surface active sites, and endowed the catalyst with excellent electrical conductivity and electron trapping ability, significantly producing catalysts with excellent visible light PHE activity. Furthermore, Ag/S–Bi2O3-3 exhibited super visible light PHE activity and excellent stability and persistence and is expected to play a potential role in the field of PHE reactions (PHERs).
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2013
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IF 5.825
Xin Xiao,Ruiping Hu,Chao Liu,Chunlan Xing,Cheng Qian,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A facile solvothermal–calcining route for the large-scale synthesis of uniform β-Bi 2 O 3 nanospheres has been demonstrated. The morphology, structure, and photoabsorption of β-Bi 2 O 3 were characterized, and the effects of the preparation conditions on the structural properties of products were analyzed. The results show that monodisperse bismuth nanospheres are formed through the solvothermal reaction where the d -fructose acting as the dominant reductant, and subsequently converted to β-Bi 2 O 3 nanospheres after the calcination in air. It is shown that the composition and structure of the products are greatly affected by the amount of d -fructose, the solvothermal and calcination temperature. The formation mechanism of β-Bi 2 O 3 nanospheres is assumed to undergo the “in situ reduction” of Bi(III)–ethylene glycol complex spheres which serve as self-sacrificing templates, followed by the “in situ oxidation” of bismuth nanospheres by oxygen during the calcination in air. The visible light-induced photocatalysis of the synthetic photocatalysts applied to the degradation of acetaminophen (APAP, a widely occurring human-derived pharmaceutical found in the environment) has been studied systematically. The photocatalytic reaction of APAP over the β-Bi 2 O 3 nanospheres follows pseudo first-order kinetics according to the Langmuir–Hinshelwood model, and exhibits a higher reaction rate constant, which is 2.5, 7, 8.1, and 79 times higher than that of commercial Bi 2 O 3 , synthetic α-Bi 2 O 3 , nitrogen doped TiO 2 (N-TiO 2 ), and Degussa P25, respectively. The superior photocatalytic activity is attributed to the narrower band gap energy (approximately 2.36 eV), nanostructure, good dispersion and high oxidation power of the β-Bi 2 O 3 nanospheres. Only one intermediate at m / z 110 can be detected by liquid chromatography/mass spectrometry (LC/MS) in the photodegradation process, while several low-molecular-weight organic acids were identified by ion chromatography (IC) analysis. By combining with the experimental determination of reactive oxygen species in the photocatalytic process and the theoretical calculation of frontier electron density of APAP, a simple, hole-predominated photodegradation pathway is proposed. In addition, the high mineralization efficiency indicates that the as-synthesized β-Bi 2 O 3 nanospheres photocatalyst can avoid secondary pollution during photocatalysis, which is important in practical applications.
研究领域:
材料科学
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环境催化
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纳米材料
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光催化
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环境污染治理
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CERAMICS INTERNATIONAL
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2016
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IF 2.758
Hao Li,Zonglian Huang,Lijin Cheng,Shu Kong,Shaojun Liu
Novel monoclinic Bi 2 O 3 -xRE 2 O 3 -yMoO 3 (RE=Pr, Nd, Sm, and Yb) based low temperature co-fired ceramics (LTCC) systems with high sintering density and low microwave dielectric loss are synthesized by conventional solid state reaction technique. The structure and dielectric properties of Bi 2 O 3 -xRE 2 O 3 -yMoO 3 ceramics are investigated. Dense BiNdMoO 6 ceramics sintered at 900 °C for 8 h in air have a low dielectric constant ε r =~7.5, a high quality factor Q × f =~ 24, 800 GHz at 7.0 GHz, and τ f =~−16 ppm/̊C. Especially, good chemical compatibility of BiNdMoO 6 with Ag electrodes is represented as well. In contrast, BiSmMoO 6 ceramics sintered at 1000 °C for 8 h show enhanced Q×f =~43, 700 GHz at 7.8 GHz with ε r = ~8.5 and τ f = ~−27 ppm/°C. Bi 2 O 3 -xRE 2 O 3 -yMoO 3 (RE=Pr, Nd, Sm, and Yb) based ceramics could be considered as promising microwave ceramics for LTCC applications.
研究领域:
材料科学
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电子工程
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Tongtong Zhang,Yuqi Wang,Xin Xie,Yanning Shao,Yuhao Zeng,Siyu Zhang,Qishe Yan,Zhongjun Li
A dual Z-scheme carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 photocatalyst were synthesized by simple solvothermal and calcination methods. The physical and chemical properties of prepared samples were explored via a series of characterization and Density Functional Theory (DFT) calculations. The formation mechanism of the composite photocatalyst was systematically studied and the formation process was simulated. Under the irradiation of visible light, 10% carbon-bridged g-C 3 N 4 /BiOI-Bi 2 O 3 exhibited the best photocatalytic performance. And the kinetics reaction model was followed pseudo-first-order kinetics. Moreover, the possible TC degradation pathways were established based on LC-MS. The enhanced photocatalytic activity was mainly attributed to the dual Z-scheme heterojunction formed by carbon-bridged g-C 3 N 4 deposition on the surface of Bi 2 O 3 and BiOI and a higher charge transfer rate of carbon-bridged g-C 3 N 4 , which effectively promoted the separation and transfer of electron-hole pairs. The trapping experiments were carried out to further explore its photocatalytic mechanism. This work provided an in-depth understanding of g-C 3 N 4 and bismuth-based catalysts.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Hui Zou,Xiancheng Ren,Jing Zhang
In this study, a superior hydrophilic polyvinylidene fluoride (PVDF) membrane with an enhanced monomer grafting ratio was prepared via an ultraviolet (UV) photografting polymerization method. The water contact angle (WCA) of the Bi2O3–acrylic acid (AA)-modified PVDF membrane reduces to 40.4° with the increasing of Bi2O3 content, illustrating significant enhancement of membrane hydrophilicity. Attenuated total reflection Fourier transform infrared spectra and atomic absorption spectroscopy reveal that Bi2O3–AA-modified membranes have more than five times AA grafting degree onto the surface of the hydrophobic PVDF membranes than only the AA-modified membrane. The mechanism of Bi2O3 promoting degree of AA grafting during the polymerization process is also especially explored in this research, and h+ and •O2– are proved to be primary active species in graft polymerization. Unexpectedly, the modified membrane has much better retention performance compared with the neat membrane. In addition, the Bi2O3–AA modified membrane also shows self-cleaning property for degradation dyes on the membrane surface.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Fei Xie,Huan Liu,Jijie Zhao,Shuai Wen,Minyu Bai,Yang Chen,Yechuan Zhu,Yao Li,Weiguo Liu
Promoting grain growth and optimizing microstructure are valid strategies for enhancing gyromagnetic and microwave dielectric properties of low-temperature sintered ferrite materials. Here, a modified low-temperature sintering technique was attempted for the synthesis of LiZnTi ferrites that have compact microstructure and improved performances. Trace amounts of CuO-Bi 2 O 3 mixtures (0.50 wt%) were adopted as sintering additives to promote grain growth and to reduce the sintering temperature. Meanwhile, Li 0.42 Zn 0.27 Ti 0.11 Fe 2.2 O 4 nanoparticles (∼21.9 nm) were synthesized using a sol-gel auto-combustion method and were used to optimize the microstructure and to restrain abnormal grain growth . XRD Rietveld refinement and SEM images revealed that uniform and dense LiZnTi ferrites with single-phase spinel structure were obtained. Results demonstrated that co-doping of Li 0.42 Zn 0.27 Ti 0.11 Fe 2.2 O 4 nanoparticles and CuO-Bi 2 O 3 mixtures allows low-temperature sintering (900 °C) to be achieved and also promotes grain growth and densification. In particular, LiZnTi ferrites that were modified with 5.00 wt% Li 0.42 Zn 0.27 Ti 0.11 Fe 2.2 O 4 nanoparticles and 0.50 wt% CuO-Bi 2 O 3 sintering additives exhibited narrow ferromagnetic resonance linewidth (Δ H , ∼145 Oe) and low dielectric loss tangent (tan δ ε , ∼2.45 × 10 −4 ) at ∼9.50 GHz, high saturation flux density ( B s , ∼364 mT), and high squareness ratio ( B r / B s , ∼0.89). Such a modified sintering technique at a low sintering temperature, as reported in this work, provides a reference for other advanced ferrites.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 47
·期 31
·14828-14839
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IF 3.3
Lin Dong,Yunlan Xu,Dengjie Zhong,Nianbing Zhong,Zhuofan Han,Yi Liu,Haixing Chang
The low electron–hole separation in the photoanode generally restricts the visible light response of photocatalytic fuel cell (PFCs). In this study, 5% NH2-MIL-125/g-C3N4/Bi2O3/Ti photoanode was synthesized and assembled with a PFC with Cu cathode to degrade rhodamine B and generate electricity. With visible light irritation, the maximum photocurrent density, maximum power density, and degradation rate of the PFC were 0.59 mA cm−2, 29.88 μW cm−2, and 97.48% (1 h), respectively. The major active species in the PFC were h+, ˙O2−, and ˙OH. The good performance of the PFC was ascribed to the formation of a double Z-type heterojunction in the 5% NH2-MIL-125/g-C3N4/Bi2O3/Ti photoanode so that the photoelectrons of NH2-MIL-125 and Bi2O3 directly combine with the photoholes of g-C3N4, making the photoholes of NH2-MIL-125 and Bi2O3 and the photoelectrons of g-C3N4 directly or indirectly involved in the RhB degradation process and generating electricity. Thus, the separation rate of the e−–h+ pairs in the photoanode and the capability of the PFC are greatly improved.
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MATERIALS TECHNOLOGY
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2018
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IF 1.232
Jixiang Wang,Hongqiang Shen,Xiaohui Dai,Chunmei Li,Weidong Shi,Yongsheng Yan
The photocatalytic technology provides a simple and effective strategy for the ever-increasing environmental and energy problem. In this work, we put forward a practical method to facilitate effectively the separation of photogenerated electrons and holes by addition of graphene oxide in Ag3PO4 and Bi2O3 nanocrystals semiconductor composite. Compared with GO-single component, the three-component GO-Ag3PO4/Bi2O3 composites with the optimum Ag3PO4/Bi2O3 ratio (6:4) and content of GO (6 wt-%) presented a further improvement on the photodegradation of tetracycline by visible light irradiation driven. GO served as a medium is used to effectively transfer of the photogenerated electrons from the conduction band Bi2O3 of to the valence band of Ag3PO4, the Z-Scheme photocatalytic degradation mechanism was proposed. Our work provides an effective method for development of pragmatic photocatalyst in present environmental pollution, energy problems and other related fields.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Binbin Shao,Zhifeng Liu,Guangming Zeng,Zhibin Wu,Yang Liu,Min Cheng,Ming Chen,Yujie Liu,Wei Zhang,Haopeng Feng
Herein, the nitrogen-doped hollow mesoporous carbon spheres (N-HMCs) modified g-C3N4/Bi2O3 direct dual semiconductor photocatalyst (g-C3N4/Bi2O3@N-HMCs) were synthesized by a facile thermal process. The morphology, structure, elements, and photoelectrochemical properties of the as-prepared samples were characterized by electron microscopy, N2 sorption–desorption, X-ray diffraction, X-ray photoelectron spectroscopy, diffuse-reflectance spectra, and photoluminescence spectroscopy, among other technologies. The photocatalytic efficiency was evaluated toward degradation of antibiotics tetracycline hydrochloride (TCH) and ciprofloxacin hydrochloride (CFH) under visible-light irradiation, and the results showed that the g-C3N4/Bi2O3@N-HMCs composite exhibited superior photocatalytic efficiency than other comparison samples, which could be attributed to the synergistic action of g-C3N4/Bi2O3 direct dual semiconductor photocatalytic system and the N-HMCs. The characterization techniques revealed that N-HMCs play three vital roles in improving photocatalytic efficiency. First, N-HMCs could serve as a photosensitizer to enhance visible-light absorption. Second, N-HMCs are an excellent conductive material to transfer the photoexcited electrons quickly to hinder the electron–hole pairs recombination. Third, N-HMCs could provide more active sites in the photocatalytic process. The scavenger experiments and electron-spin-resonance results revealed that the active substances h+, •O2–, and •OH performed together in the photodegradation system. Additionally, the g-C3N4/Bi2O3@N-HMCs composite showed favorable photostability after six rounds of recycling, suggesting the great prospects of the practical application of g-C3N4/Bi2O3@N-HMCs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Guangping He,Chunlan Xing,Xin Xiao,Ruiping Hu,Xiaoxi Zuo,Junmin Nan
Novel three-dimensional flower-like Bi 12 O 17 Cl 2 /β-Bi 2 O 3 composites are prepared using a facile solvothermal-calcining process and their photocatalytic performances for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) are evaluated under visible light irradiation. The formation of such composites is assumed to involve the reduction of Bi(III) to nano-metallic bismuth via a solvothermal process, followed by the reaction of bismuth with oxygen and bismuth oxide chloride hydroxide during the calcination in air. The XRD, XPS, EDS mapping, HRTEM, UV–vis DRS, and photocurrent measurement results indicate that heterojunctions are formed between Bi 12 O 17 Cl 2 and β-Bi 2 O 3 with broad contact interfaces. The as-synthesized Bi 12 O 17 Cl 2 /β-Bi 2 O 3 hybrid materials possess favorable band structures, heterojunction structures, relatively high specific surface areas, and hierarchical micro/nano-structures, resulting in superior photocatalytic and mineralization efficiencies for the decomposition of PTBP under visible light irradiation. The optimum photocatalytic activity of a Bi 12 O 17 Cl 2 /β-Bi 2 O 3 sample is approximately 3, 12, 51, and 107 times higher than the activities of single β-Bi 2 O 3 , Bi 12 O 17 Cl 2 , nitrogen-doped TiO 2 , and BiOCl, respectively. In addition, the photogenerated reactive species are identified based on free radicals trapping experiments and EPR analysis, which reveals that the photodegradation of PTPB over Bi 12 O 17 Cl 2 /β-Bi 2 O 3 under visible light is dominated by direct hole and superoxide radical oxidation rather than oxidized by hydroxyl radical.
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