INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Jingjing Wang,Zhiwei Liu,Liying Wang,Lu Li,Qian Liu,Zhiwei Liu,Zhenzhu Cao,Yongfeng Zhang,Lin Cheng,Jucai Yang
A novel photocatalyst WO 3 /BiMOF/Bi 2 WO 6 was prepared by self-assembly of benzene dicarboxylic acid ligand (H 2 BDC) anchoring Bi source on the surface of Bi 2 WO 6 to form BiMOF, in which WO 3 spherical particles were scattered uniformly. Thereby, an amount of metal and oxygen vacancies (V M + O ) are generated. The 3D flower-like spherical photocatalyst has a large specific surface area and close interfacial contacts, which can provide sufficient channels for carrier migration. The introduction of BiMOF enhanced the light absorption capability of photocatalyst. As a result, the flower-like WO 3 /BiMOF/Bi 2 WO 6 structure exhibits excellent nitrogen fixation as well as high-level photocatalytic activity in degrading Rhodamine B (RhB) and tetracycline (TC) under visible light. For one thing, WO 3 /BiMOF/Bi 2 WO 6 produce ammonia up to 227 μmol L −1 h −1 . For another, the degradation efficacy displayed by RhB 99.3% in 15 min and TC 93.6% degradation in 50 min, respectively. In addition, the catalysts showed excellent cyclic stability, with constant degradation efficiencies for at least 4 cycles. The experimental results of free radical scavenging showed that holes (h + ) and superoxide radical (·O 2− ) were the main active substances in the photodegradation process. Therefore, the photocatalytic mechanism of 3D flower-like WO 3 /BiMOF/Bi 2 WO 6 was also proposed.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yanyu Song,Xianbo Sun,Long D. Nghiem,Jun Duan,Wen Liu,Yongdi Liu,Zhengqing Cai
Fe-based metal–organic frameworks (Fe-MOFs) have been extensively studied as fascinating photocatalysts due to their tunable structure and appealing light response. However, the application of traditional three-dimensional (3D) Fe-MOFs is limited by rapid carrier recombination and inaccessible active sites. In this work, a novel two-dimensional (2D) Bi decorated Fe-MOFs nanosheet photocatalyst was constructed, which exhibits significantly enhanced solar-driven photocatalytic activity due to the synergistic effect of localized surface plasmon resonance (LSPR) and surface high-density exposed metal active sites. Unlike 3D structures, 2D nanosheets enable surface densely exposed Fe-O clusters, which can be conveniently triggered by incident light to improve light response. 2D Fe-MOFs exhibit narrower bandgap and faster electron transfer thanks to the superior electronic effects of ultrathin nanosheets, including quantum confinement, electron delocalization and induction effects. Moreover, the unique 2D structure drastically reduces mass transfer resistance and guarantees quick pollutant diffusion, thus achieving adequate contact between pollutants and more accessible reactive sites. Bi nanoparticles (NPs), a non-precious plasma metal, further facilitate carrier separation and migration through LSPR effect. Driven by local electromagnetic field, photoinduced hot electrons move from Bi NPs to 2D Fe-MOFs, where they contribute to the production of active species. Meanwhile, light scattering effect of Bi NPs endows the catalyst with boosted light absorption by prolonging the incident photons path. With carbamazepine as target pollutant, the photocatalysis rate of 2D Bi decorated Fe-MOFs (Bi@Fe-MOFs) under solar light is 10.3 times that of 3D Fe-MOFs. This work provides new insights for designing MOFs photocatalysts with efficient solar-driven photocatalytic water purification.
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Qingying Feng,Yingqing Zhan,Wei Yang,Ao Sun,Hongyu Dong,Yu-Hsuan Chiao,Yucheng Liu,Ximin Chen,Yiwen Chen
Developing the multi-functional membranes including oil/water emulsion separation and removal of hazardous organic pollutants is essential to the purification of the complicated wastewater. However, it remains a daunting challenge to combine these intended functions while maintaining high separation efficiency. Herein, we developed a new 2D lamellar MXene/poly (arylene ether nitrile) (PEN) fibrous composite membrane through the self-assembly of TiO 2 nanoparticles intercalated MXene nanosheets onto the porous PEN nanofibrous mats and bioinspired polydopamine triggered chemical-crosslinking with polyethyleneimine (PEI). Such nano-intercalation and mussel-inspired crosslinking could effectively regulate the interlayer spacing of the MXene nanosheet skin layer and surface wettability of the composite membrane, which also further contributed to the fast separation and unique bifunctional feature. It was found that the MXene@TiO 2 /PEN fibrous composite membrane exhibited low oil-adhesion and superhydrophilic (WCA = 0°)/underwater superoleophobic (UOCA > 155°) properties, which could efficiently separate various surfactant-stabilized oil-in-water emulsions under low pressure of 0.04 MPa while keeping good stability (Under 1 M HCl and 2 M NaOH solutions) and recyclability. Interestingly, the fibrous composite membrane achieved favorable permeation flux of 908–1003 Lm −2 h −1 (2270–2507.5 Lm −2 h −1 bar −1 ) in comparison to other reported MXene based multifunctional composite membranes. Moreover, owing to the synergistic effect of MXene nanosheets and TiO 2 nanoparticles, the MXene@TiO 2 /PEN membrane showed excellent photocatalytic degradation performance for various dyes under visible light, i.e. the photocatalytic degradation efficiency for 15 ppm MB, MO, CV, and MeB solutions achieved 92.31%, 93.50%, 98.06%, and 99.30% within 60 min, respectively. Such 2D MXene bio-functional composite membranes with outstanding oil/water emulsions separation and photocatalytic degradation of dyes pave an avenue for treating complicated oily wastewater.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Fang Deng,Qian Zhang,Lixia Yang,Xubiao Luo,Aijie Wang,Shenglian Luo,Dionysios D. Dionysiou
Although Bi-based compounds are effective photocatalysts for degrading organic pollutants under visible-light irradiation, their visible-light photocatalytic activities are still low and far from practical application. In this study, novel graphene-functionalized Bi-bridge Z-scheme black BiOCl/Bi 2 O 3 (black BiOCl-Bi-Bi 2 O 3 /rGO) heterojunctions with oxygen vacancies were prepared via in situ Fe reduction of BiOCl/graphene oxide nanoplates. In comparison with BiOCl/graphene oxide nanoplates, the black BiOCl-Bi-Bi 2 O 3 /rGO heterojunctions have stronger visible-light absorption, and exhibit more efficient charge separation and higher visible-light photocatalytic activity in degrading 2-nitrophenol (2NP). The black BiOCl-Bi-Bi 2 O 3 /rGO 0.4 shows the highest visible-light photocatalytic activity with almost complete degradation of 2NP, which is attributed to proper bandgap match between black BiOCl and Bi 2 O 3 , multiple charge transfer channels via Bi-bridge and rGO, and efficient charge separation. Of special importance, black BiOCl-Bi-Bi 2 O 3 /rGO heterojunction can effectively treat real industrial wastewater with 70.3% COD removal efficiency, and it shows superior long-term stability. Additionally, a possible photocatalytic mechanism of black BiOCl-Bi-Bi 2 O 3 /rGO heterojunctions based on multiple charge transfer channels was proposed.
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Zhiqun Xie,Jiali Zhou,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
Novel Fenton-like catalyst γ-Cu-Al 2 O 3 -Bi 12 O 15 Cl 6 with electron-poor Cu centre and electron-rich Bi centre was synthesized for selective degradation of phenolic compounds. Different from electron-rich Cu centre catalysts, the electron-poor Cu centre, which was induced by high electronegativity of Bi, could facilitate the formation of σ-Cu-ligand with phenolic compounds. On one hand, H 2 O 2 could directly oxidize σ-Cu-ligand to HO-adduct radicals with the generation of OH. Meanwhile, Cu(II) in the σ-Cu(II) complexes could be reduced to Cu(I) by oxidization of the HO-adduct radicals to hydroxylation products. Such reaction not only prevented Cu(II) from oxidizing H 2 O 2 to HO 2 /O 2 − but also enhanced the redox cycle of Cu(II)/Cu(I), which improved the catalytic activity and H 2 O 2 utilization. On the other hand, although the σ-Cu-ligand was gradually decreased with the decrease of phenolic compounds, dual-reaction centre played the dominant role in catalytic reaction . In addition, large amounts of oxygen vacancies (OVs) are formed in Bi 12 O 15 Cl 6 during the calcining process (BiOCl→Bi 12 O 15 Cl 6 ) , which can also increase the generation of OH. Thus, both electron-rich Bi center and OVs could still reduce H 2 O 2 to · OH for organics degradation even without the formation of σ-Cu-ligand. Being attributed to the synergistic effect of σ-Cu-ligand, dual-reaction centre and OVs mentioned above, γ-Cu-Al 2 O 3 -Bi 12 O 15 Cl 6 achieved high catalytic activity for phenolic compounds degradation and utilization efficiency of H 2 O 2 (η). In addition, various analytic methods (XPS, TPR, FT-IR, Raman, EPR and solid-state EPR) were used to prove the synergistic effect of the electron-poor/rich centre, σ-Cu-ligand and OVs of catalyst.
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高影响因子
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