SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Wenqi Liu,Jingyan Zhang,Mei Dong,Zhaoyi Ding,Qunfei Wang,Fanghao Ning,Qin He,Yanyan Chen,Zhen Zhao,Zhongfu Li,Conghua Liu
Low-silica chabazite (CHA) catalysts with varying configurations of Cu 2+ -2Z and [Cu(OH)] + -Z active centers are developed through the regulation of the opening of CHA-cages. The catalysts are subsequently applied to the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reactions. A series of characterizations and performance evaluations indicate that the density of [Cu(OH)] + -Z in eight-member rings (8MRs) is positively correlated with low-temperature performance. Moreover, the presence of partial Cu 2+ -2Z in six-member rings (6MRs) enhances activity and tolerance at high temperatures. The residual K + ions in the CHA-cages after NH 4 + exchange are retained in the 6MRs. Density functional theory calculations demonstrate that the residual K + ions stabilize the 6MRs structure, ensuring the entry and stable presence of the active Cu 2+ -2Z centers. In situ analysis reveals the reaction intermediates involved in the NH 3 -SCR process on representative catalysts. These findings can further elucidate the active centers of CHA-type catalysts and guide the design of commercial catalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Xia Zhang,Changcheng Yang,Jian Su,Zhi-Hui Xie,Shixiong Hao
The lower specific surface area and limited surface contact between BiOCl and TiO 2 in composite fabricated by hybridization of TiO 2 with BiOCl extremely hinder its catalytic performance. In this work, the area of interface contact between BiOCl and TiO 2 was increased through the mediation of SiO 2 , and a Bi-modified ternary 0D/2D/2D TiO 2 /BiOCl Z-scheme heterojunction photocatalyst with large specific surface area (= 237.83 m 2 g −1 ) and surface plasmon resonance (SPR) effect was constructed in situ by ingeniously utilizing the reduction of carbon species generated during the calcination process. The results show that the COD removal rate of Bi/TBOC-10% for real liquor brewing wastewater (LBW) reaches 90.5% after 10 hours of visible light irradiation, which is 2.6 times and 2.1 times that of TiO 2 and Degussa P25, respectively. The COD removal rate of the composite was reduced only by 8.9% after five cycles of performance test (50 h). Photoluminescence spectroscopy (PL), Transient Photocurrent Response (TPR), Electrochemical Impedance Spectroscopy (EIS) and BET characterization suggest that its excellent photocatalytic activity should be attributed to the Z-scheme heterojunction that broadens the light absorption range while retains strong oxidation-reduction active sites, the SPR effect that facilitates the separation and migration of photogenerated carriers, and high specific surface area of the composite that provides more active sites for the photodegradation reaction.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Xinglin Li,Pengfei Zhu,Yu Chen,Maojie Zhang,Yunhui Jiang
In this paper, Co 2+ was successfully assembled into a complex by solvothermal method with meso-tetra (4-carboxyphenyl) porphyrin (TCPP), and then a novel P/BiOIO 3 /Co-TCPP inorganic-organic composite photocatalytic material was prepared by one-pot solvothermal method. It was found that after 60 min of reaction under visible light, the degradation rate of the preferred P/BiOIO 3 /Co-TCPP composite material for 20 mg/L oxytetracycline hydrochloride (OTC) reached 88.15 %, with its pseudo-first-order kinetic model fitting constant measured at 0.03852 min −1 . It was 5.12 and 1.52 times that of BiOIO 3 and P-doped BiOIO 3 respectively, and there was no significant decrease in activity after three consecutive uses. Meanwhile, the noxiousness of the OTC solution after photocatalytic degradation by this catalyst was significantly reduced. The characterization results indicate that the primary factor contributing to the improved activity is the P/BiOIO 3 /Co-TCPP catalyst can be attributed to the doping of BiOIO 3 by P and the coupling of Co-TCPP to BiOIO 3 , which significantly improves the catalyst's response ability to visible light. Meanwhile, P/BiOIO 3 and Co-TCPP form a Z -scheme heterojunction, which greatly facilitates the separation of photogenerated carriers. Finally, the electron transfer mechanism and possible degradation pathways of the photocatalytic degradation of OTC by P/BiOIO 3 /Co-TCPP were proposed. This study provides a feasible and effective method for the modification of BiOIO 3 -based heterojunction photocatalysts and the treatment of antibiotics in water bodies.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 97
·期 5
·1326-1335
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IF 3.709
Dandan You,Ming Li,Zhuren Pan,Zhenyang Yin,Ning Wang
BACKGROUND 2,4-Dichlorophenol (2,4-DCP) is widely used as a preservative, pesticide, germicide, etc. However, it is very damaging to organisms and the environment, and it is difficult to decompose because of its high stability. To improve the photocatalytic ability of photocatalysts for degrading hazardous substances, like 2,4-DCP, constructing heterojunction is an effective strategy because of its restraint of electron–hole recombination and extension of light absorption spectra. RESULTS A novel photocatalyst Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was successfully synthesized by one-step in-situ co-crystallization method. The formation of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 composite was confirmed by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectrometer (FTIR spectrometer) and transmission electron microscope (TEM). The obtained optimal composite exhibited an excellent photocatalytic performance of degrading 2,4-DCP with an efficiency of 95% under visible-light irradiation. The trapping experiments indicated that superoxide radicals, electrons, and singlet oxygen played vital roles in 2,4-DCP decomposition and confirmed the dual Z-scheme heterojunction structure of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 . Furthermore, the possible reaction pathway was deduced based on the trapping experiments and the intermediate products detected by liquid chromatography tandem mass spectrometry. CONCLUSION The photocatalytic performance of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was enhanced because the more efficient separation and transfer of photogenerated charge carriers was achieved due to the formation of dual Z-scheme heterojunction. This work presented a simple and feasible synthesis method to prepare a ternary photocatalyst for improving the photocatalytic ability, and it can assist in further understanding the reaction mechanism of 2,4-DCP degradation. © 2022 Society of Chemical Industry (SCI).
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Fei Chen,Qi Yang,Yali Wang,Fubing Yao,Yinghao Ma,Xiaoding Huang,Xiaoming Li,Dongbo Wang,Guangming Zeng,Hanqing Yu
Despite massive research efforts are devoted into wastewater treatment, the coexistence of organic compounds and heavy metals is an escalating environmental problem, especially in surface waters. In this work, a rapid reduction of Cr(VI) and oxidation of refractory ciprofloxacin (CIP) were achieved simultaneously by the Ag/AgBr decorated BiVO 4 Z-scheme heterojunction under visible light irradiation. The ternary photocatalyst was fabricated by a facile hydrothermal method, followed by photoreduction process. Superior photocatalytic performance of Ag/AgBr/BiVO 4 was not only reflected in single Cr(VI) reduction or CIP oxidation, but also displayed in simultaneous removal of two contaminants, which should be attributed to the enhanced visible light absorption, high charge carriers separation efficiency and redox of their photo-generated electrons and holes in the constructed Z-scheme heterostructure. Characterization methods including UV–vis absorption spectra (UV–vis DRS), transient photocurrent response (PC), photoluminescence spectra (PL) and electrochemical impedance spectra (EIS) were employed to confirm the mechanism. The active species trapping experiments and electron spin resonance (ESR) measurements demonstrated that h + , O 2 − and OH all participated in CIP degradation, while e − and O 2 − were the main active groups for Cr(VI) reduction. The presence of Ag facilitated a Z-scheme Ag/AgBr/BiVO 4 photocatalyst due to its electron mediator role. The CIP mineralization was verified by three-dimensional excitation-emission matrix fluorescence spectra (3D EEMs) and total organic carbon (TOC) removal. At last, the possible CIP degradation pathway was also proposed. This work will provide a new route to design the novel Z-scheme photocatalysts for the simultaneous degradation of organic pollutants and reduction of heavy metal ions in water.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Bing Feng,Zhengying Wu,Jinsong Liu,Kongjun Zhu,Ziquan Li,Xin Jin,Yindi Hou,Qingyang Xi,Mengqi Cong,Pengcheng Liu,Qilin Gu
Inspired by the natural photosynthesis in green plants, artificial heterogeneous Z-scheme photocatalytic systems are widely used to settle environmental concerns and energy crises, and their excellent characteristics come from long-term stability, wide absorption range, high charge-separation efficiency, and strong redox ability. However, the contribution of the surface-adsorbed dyes antenna molecule is seldom considered in the process of Z-scheme photocatalysis. In this study, we construct AgBr quantum dots decorated MoO 3 nanobelts as a novel Z-scheme photocatalyst by an oriented diffusing and charge induced deposition. For the first time, we find the synergistic effect caused by the suitable energy band match among RhB dyes, AgBr nanoparticles, and MoO 3 nanobelts, leading to the ultrafast dye-sensitized-assisted electron transfer process. This is responsible for excellent photocatalytic activities of the achieved AgBr/MoO 3 monolithic catalyst for degrading RhB under visible light irradiation. Simultaneously, changing of the band gaps and detailed mechanism for high efficiency degradation is analyzed and explored by theoretical calculations and designing further experiments. It is proposed that ultrafast degradation of the RhB on the AgBr/MoO 3 nanocomposites is due to both the photocatalytic process and the dye sensitization; the superoxide radical O 2 − , which is produced by accumulated dye-sensitization-induced abundant electrons with powerful potential in the CB of AgBr accompanying by quick combination of electrons in the CB of MoO 3 with photogenerated holes in the VB of AgBr, is a dominant reactive species for the degradation of RhB under visible light irradiation.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenfei Yang,Xinnian Xia,Luhua Shao,Longlu wang,Yutang Liu
Herein, Ag 3 PO 4 /mixed-valence MIL-88A(Fe) [AMM] Z-scheme heterojunctions with an in-situ-generated photo–Fenton process were successfully constructed. The optimized AMM-20 heterojunctions show the maximum rate of photocatalytic TC degradation, which is 2.5 and 6.6 times of pristine Ag 3 PO 4 and MIL-88A(Fe). The electronic and band structures of Ag 3 PO 4 , MIL-88A(Fe), m-MIL-88A(Fe) and AMM heterojunctions were deeply investigated by both experimental and theoretical simulation. The Z-scheme transfer pathway greatly accelerates the transfer rate of charge carriers and effectively inhibits the photocorrosion, leading to the improvement of photocatalytic activity and photostability. Moreover, the adjustment of the Fe II /Fe III ratio of mixed-valence MIL-88A(Fe) further enhances the photocatalytic activity of the hybrid photocatalysts, benefiting from the promotion of the efficiency of the in-situ-generated photo-Fenton process. The Z-scheme transfer route coupling with an in-situ-generated photo–Fenton process was verified by the free radical trapping experiment, in-situ XPS measurement, in-situ ESR measurement, and coumarin fluorescence analysis. The degradation pathways of TC were determined through LC-MS analysis and theoretical calculation. Furthermore, the toxicity of intermediates was evaluated by QSAR prediction.
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高影响因子
APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Ning Li,Xueyun Gao,Haikuan Fan,Yangqin Gao,Lei Ge
Effective and suitable utilization of solar energy was achieved using a full-spectrum-response photocatalyst AgBr/Cs x WO 3 , applied in the photocatalytic and photochromic field. Benefitting from near-infrared (NIR) absorption ability of Cs x WO 3 , AgBr/Cs x WO 3 exhibits enhanced visible-near-infrared (Vis-NIR) driven photocatalytic activity. Based on X-ray photoelectron spectroscopy (XPS), photoluminescence spectra (PL), and the photoelectrochemical analysis, AgBr and Cs x WO 3 formed a Z-scheme system at the interface to efficiently separate and transfer photo-induced electrons at a fast rate. The quenching experiment and the electron spin resonance (ESR) tests indicated that the photocatalytic reaction is activated by the production of superoxide radicals. Furthermore, the photochromic analysis to different light exhibits the AgBr/Cs x WO 3 heterostructure is stable under visible light with negligible photodeposition of AgBr, and has excellent double photochromic activity with visible-shielding effect of AgBr to Ag 0 and infrared-blocking effect of Cs x WO 3 under ultraviolet light. This research provides new insights into the manufacture of energy-efficient and environmentally friendly materials that provide excellent performance in both thermal insulation and decontamination.
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高影响因子
Small
·
2025
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IF 12.1
Kai Zhang,Yao Niu,Haiyang Xing,Peifeng Wang,Lingbing Wu,Xianghua Yao,Youlong Xu
Layered transition metal oxide P2-Na 0.7 MnO 2 typically faces challenges such as low potential plateau, phase transitions, and poor rate capability. A cost-effective high-entropy substitution strategy is developed to synthesize P2-Na 0.7 Li 0.02 K 0.02 Fe 0.2 Cu 0.2 La 0.02 Ti 0.02 V 0.02 Mn 0.5 O 2 . The study elucidates that the synergistic influence of substituted elements, specifically Cu 2+ /Cu 3+ and Fe 3+ /Fe 4+ , engenders higher redox potentials, substantially enhancing the potential plateau (the discharge midpoint potential increased from 2.36–3.5 V). The addition of La improves structural stability and conductivity. This high-entropy substitution methodology adeptly mitigates volumetric O2 phase transitions, fostering the formation of a moderate self-regulating P2+“Z” phase. The material's volume change in the second cycle at approximately the same potential (≈2.6 V) is about -0.17%. Notably, Hall effect testing indicates that the material primarily conducts electricity through holes. Both bulk and surface carrier concentrations, as well as mobility, have increased. The conductivity increases up to four times (from 8.43E-06 (S cm −1 ) to 3.49E-05 (S cm −1 )). The material delivers a reversible capacity of 151.8 mAh g −1 at 0.1 C within the range of 1.5–4.5 V, retaining 81.3% of capacity at 1 C after 100 cycles. It retains 97.6% capacity at 1 C after 50 cycles within the range of 2.0–4.2 V.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2025
·
IF 2.5
Sujing Zou,Xu Lu,Xiqiang Mao,Lei Wu,Jun Li,Shaoyi Li,Jian Yang,Ximei Fan
In photocatalysis, the construction of double Z-type heterojunction can effectively improve the photogenerated carrier separation efficiency, enhance the light absorption capacity and improve the photocatalytic reaction rate. Herein, a series of TiO2/KWO/BiOBr photocatalysts are successfully synthesized via hydrothermal and electrostatic self-assembly method. All the samples are investigated and characterized by X-ray diffraction, Scanning electron microscopy, Ultraviolet–visible spectroscopy and X-ray photoelectron spectroscopy to insight into the microstructures and optical properties. During the photocatalytic degradation of toluene experiments, the optimized TiO2/KWO/BiOBr sample exhibits the excellent photocatalytic performance. Under the irradiation of xenon lamp for 120 min, degradation rate of toluene reaches 95%, which is 10.75, 7.12 and 7.41 times higher than that of TiO2, KWO and BiOBr, respectively. The UV–vis diffuse reflectance, electrochemical impedance spectroscopy and transient photocurrent response of the TiO2/KWO/BiOBr photocatalyst verify that the enhanced photocatalytic activity is ascribed to its expanded light absorption range and the efficient separation efficiency of photogenerated carriers. In addition, the degradation experiments of toluene are also carried out in different atmospheres which could control the formation of different free radicals. It shows that superoxide anions and hydroxyl radicals play critical roles in the toluene degradation. The corresponding photocatalytic degradation mechanism is proposed that the excellent photocatalytic activity is attributed to providing more active sites and strong oxidation capacity for toluene.
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高影响因子
LANGMUIR
·
2025
·
IF 3.9
Meiting Li,Bingxin Yuan,Chi Zhang,Jia Li,Xuejiao Wang
Hierarchical BiOCl/BiOI and BiO(Cl,I) photocatalysts were obtained via a solution-phase reaction for visible-light-driven elimination of aqueous pollutants, where the phase/morphology evolution, relationship between energy band/microstructure structure and photocatalytic properties, and photoreaction mechanism can be deciphered in detail. It was well-documented that the R = 8:1 BiOCl/BiOI heterojunctions with a coherent interface of Bi and O atoms showed a relatively strong redox capacity owing to their rapid Z-scheme charge transfer and large interfacial contact and eventually degraded ∼92.52% and 96.57% of rhodamine B (RhB) and tetracycline (TC) molecules under 10 min of visible light irradiation, which was larger than those of bare BiOCl and BiOI. However, their poor photocatalytic stability was proved to be unfavorable to practical applications. The best BiOCl0.88I0.12 solid solutions separately elucidated the optimal RhB and TC removal efficiency of ∼99.97% and 97.54% after 10 and 6 min of illumination, and it still maintained a high photodegradation efficiency toward RhB after five consecutive runs. The exceptional photocatalytic performance is cogoverned by the characteristics of in situ generated oxygen vacancies and defect energy levels.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guojun Li,Zheng Lian,Zhengwei Wan,Zhinian Liu,Jingwen Qian,Yue Deng,Shule Zhang,Qin Zhong
Photocatalytic oxidation offers a viable method for removing low-concentration NO from the atmosphere. However, poor oxygen adsorption-activation capacity and high re-combination rate of electrons and holes limit the photocatalytic NO oxidation activity. To over-come these problems, Ni(OH) 2 clusters decorated NiTiO 3 Z-scheme heterojunctions are constructed by a precipitation method. The tight interfacial contacts and built-in electric field between the (0 0 2) crystal facet of Ni(OH) 2 and (0 1 2) crystal facet of NiTiO 3 promote a Z-scheme charge transfer mechanism. This Z-scheme mechanism will enhance the charge-transfer driving force and result in high separation efficiency of the charges, thus leading to an enhanced photocatalytic performance. Importantly, introducing Ni(OH) 2 is considered a promising strategy to enhance the adsorption ability of the O 2 , NO and NO 2 . This might help to increase O 2 activation efficiency and speed up NO deep oxidation, leading to high NO removal efficiency and low NO 2 selectivity. Benefiting from the above excellent properties, the photocatalytic NO oxidation efficiency of Ni(OH) 2 /NiTiO 3 composites is enhanced and the formation of more toxic NO 2 is inhibited compared with that of NiTiO 3 . This work offers a promising and effective route to design efficient NiTiO 3 -based photocatalysts in the application of environmental remediation.
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高影响因子
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