CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 12
·15036-15047
·
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
·
环境催化
·
光催化
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纳米材料
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环境工程
✓ 已验证
DOI
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
·
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Dehui Leng,Tingting Wang,YingFen Li,Zibin Huang,Huimin Wang,Yixin Wan,Xiaoxiao Pei,Junli Wang
Plasmonics, especially the localized surface plasmon resonance (LSPR) in non-noble metal bismuth nanoparticles (Bi NPs), and its spectral features and applications have stimulated increasing research interest in recent years. However, the lack of mature methods to prepare Bi NPs with a well-controlled size and/or shape significantly limits the experimental investigations concerning the LSPR optical properties. Herein, we realize the size-tunable synthesis of nearly monodisperse spherical Bi NPs through a thiolate pyrolysis reaction in solution. The instantaneous thermolysis of a layered molecular intermediate, bismuth dodecanethiolate [Bi(SC12H25)3], results in a classical LaMer mechanism for the nucleation and growth of Bi NPs, allowing for a precise size control from 65 to 205 nm in the average diameter. The diameter tunability enables a systematic study on the size dependence of LSPR optical properties of Bi NPs, and we observe rich ultraviolet–visible–near-infrared spectral responses arising from the LSPR absorption and scattering of Bi NPs as their size varies, which will greatly benefit the light harvesting and manipulation in the solar spectrum. Furthermore, we find that a complete oxidation occurs to Bi NPs under air flow at the temperature when they melt and accordingly generate metastable tetragonal-phase β-Bi2O3 NPs that show an optical band gap of 2.15 eV and interesting temperature-dependent β → α → δ → (γ + β) polymorphic transitions.
研究领域:
等离子体学
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纳米技术
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材料科学
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光学性质
·
化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junli Nie,Gangqiang Zhu,Weibin Zhang,Jianzhi Gao,Peng Zhong,Xiaotao Xie,Yu Huang,Mirabbos Hojamberdiev
Flower-like n -type CeO 2-δ is hybridized with p -type β-Bi 2 O 3 nanoparticles to design a novel β-Bi 2 O 3 /CeO 2-δ p - n heterojunction photocatalyst via a thermal treatment process of Bi/Ce(CO 3 )(OH) precursor. The synthesized β-Bi 2 O 3 /CeO 2-δ exhibits a remarkable enhancement in NO removal and significant suppression of toxic intermediates nitrogen dioxide (NO 2 ) under visible light irradiation. The superior photocatalytic activity of β-Bi 2 O 3 /CeO 2-δ for NO removal is mainly derived from the synergistic effects of the oxygen vacancies (OVs) and p-n heterojunction. The OVs not only enhance the visible light utilization and boost the separation of electron-hole pairs but also improve the adsorption and activation of NO and O 2 . Particularly, the p-n heterojunction is beneficial for the interfacial migration of photogenerated charge carriers. Electron spin resonance (ESR) and trapping experiment reveal that the synergistic effects of OVs and p-n heterojunction can induce the generation of more active species. The electrochemical measurements and density-functional theory (DFT) calculations in-depth confirm that both p-n heterojunction and OVs can accelerate the interfacial charge transfer, resulting in the deep oxidation of reactants. Therefore, the flower-like β-Bi 2 O 3 /CeO 2-δ p-n heterojunction photocatalyst exhibits an advanced photocatalytic activity for deep NO removal and a suppressed NO 2 generation. In addition, monitoring the reaction products by in situ Fourier transform infrared spectrum (FTIR) further validates that the main products of nitrates are formed during the photocatalytic process. This work demonstrates a straightforward approach for construction of p-n heterojunction photocatalysts, which can enhance the effective photocatalytic activity and stability for NO removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123628
·
IF 7.5
Yan Wang,Jiang Meng,Siyao Wang,Yuzi Yin,Tianyi Huang,Yue Wang,Jianyu Han
The development of efficient photocatalysts for antibiotic removal remains constrained by the lack of well-defined active sites and severe charge recombination. Herein, a nitrogen-vacancy-rich carbon nitride coupled with mixed-phase bismuth oxide (α-Bi 2 O 3 /β-Bi 2 O 3 /g-C 3 N 4 -nitrogen vacancies, denoted as N V -αβBO) was rationally constructed via NaBH 4 -assisted defect engineering and in-situ phase transformation. The optimized N V -αβBO-4 shows significantly enhanced photocatalytic performance under visible light and rapidly removes tetracycline hydrochloride (TCH). Systematic characterizations show that nitrogen vacancies facilitate O 2 adsorption and activation. Meanwhile, the interfacial coupling among α-Bi 2 O 3 , β-Bi 2 O 3 and defective g-C 3 N 4 (N V -CN-10) promotes directional charge transfer and suppresses carrier recombination. More importantly, a dual S-scheme charge-transfer pathway is established. This pathway preserves photogenerated electrons and holes with strong redox capability, thereby promoting reactive oxygen species (ROS) generation. This work demonstrates a synergistic strategy by integrating defect engineering with phase-junction construction, providing new insights into the design of high-performance photocatalysts for antibiotic wastewater treatment.
✓ 已验证
DOI
高影响因子
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