CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Yingzhen Zhang,Yonggang Lei,Tianxue Zhu,Zengxing Li,Shen Xu,Jianying Huang,Xiao Li,Weilong Cai,Yuekun Lai,Xiaojun Bao
Exploring efficient and stable photoanode materials is a necessary link to realize the practical application of solar-driven photoelectrochemical (PEC) water splitting. Hence, we prepared rutile TiO 2 nanorods , with a width of 50 nm, which was growth in situ on carbon cloth (TiO 2 @CC) by hydrothermal reaction. And then, Ag nanoparticles (NPs) and biomass N,S-C NPs were chosen for the additional modification of the fabricated TiO 2 nanorods to produce broccoli-like Ag-N,S-C/TiO 2 @CC nanocomposites . According to the result of ultraviolet–visible diffuse reflectance spectroscopy (UV–vis) and PEC water splitting performance tests, Ag-N,S-C/TiO 2 @CC broadens the absorption region of TiO 2 @CC from the ultraviolet region to the visible region. Under AM 1.5G solar light irradiation, the photocurrent density of Ag-N,S-C/TiO 2 @CC is 89.8 μA·cm −2 , which is 11.8 times higher than TiO 2 @CC. Under visible light irradiation, the photocurrent density of Ag-N,S-C/TiO 2 @CC reaches to 12.6 μA·cm −2 , which is 21.0 times higher than TiO 2 @CC. Moreover, Ag-N,S-C/TiO 2 @CC shows a photocurrent responses in full pH range. It can be found that Ag NPs and N, S-C NPs play key roles in broaden the absorption range of TiO 2 nanorods to the visible light region and, promote the occurrence of PEC water oxidation reaction due to the surface plasmon resonance effect of Ag NPs and the synergistic effect of N,S-C NPs. The mechanism demonstrated that Ag-N,S-C/TiO 2 @CC can separate the photogenerated electron-hole pairs effectively and transfer the photogenerated electrons to the photocathode (Pt plate) in time. This research provides a new strategy for exploration surface plasma metal coupled biomass carbon materials in the field of PEC water splitting.
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JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Jing Zhang,Weiqi Liao,Hao Zheng,Yunshang Zhang,Lebing Xia,Bo-Tao Teng,Ji-Qing Lu,Weixin Huang,Zhenhua Zhang
Pd supported on different anatase TiO 2 nanocrystals predominantly exposing either {1 0 0}, {1 0 1}, or {0 0 1} facets were tested for CO 2 hydrogenation into formate. Remarkable morphology-dependent catalysis was observed. Compared to 2%Pd/TiO 2 {1 0 1} and 2%Pd/TiO 2 {0 0 1} catalysts, 2%Pd/TiO 2 {1 0 0} is highly active and stable, affording an unprecedented turnover frequency of ca. 1369 h −1 and keeping stable after 6 cycles at 313 K. This can be associated with, on the one hand, higher density of moderate basic site and relatively more Pd(0) species over 2%Pd/TiO 2 {1 0 0} contribute to the activations of CO 2 and H 2 , respectively, favorable for the activity; On the other hand, higher oxygen vacancy concentrations in the TiO 2 {1 0 0} promote the Pd-TiO 2 interactions and result in the formation and stability of flat Pd particles over 2%Pd/TiO 2 {1 0 0}, beneficial to the stability. These results highlight the importance of oxide morphology in formate formation and open up possibilities of oxide morphology engineering for developing efficient Pd-based catalysts for CO 2 hydrogenation.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 48
·17911-17919
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IF 4.39
Can Wang,Ruikang Zhang,Yucong Miao,Qihui Xue,Borong Yu,Yuanzhe Gao,Zhangang Han,Mingfei Shao
TiO2-based nanosheet materials with a core–shell structure are expected to be one of the promising photocatalysts for the degradation of organic pollution. It is a challenge to synthesize TiO2 by the desired nucleation and growth process, so most reported TiO2 core–shell photocatalysts are prepared using TiO2 as a core material. Layered double hydroxides (LDHs) are considered ideal platforms to grow TiO2in situ and further serve as additional components to improve the separation of photogenerated charge carriers. In this work, we report the design and fabrication of anatase TiO2-coated ZnAl-layered double oxide (LDO@TiO2) nanosheets, which involve the in situ growth of TiO2 on ZnAl-LDH followed by subsequent calcination treatment. The resulting LDO@TiO2 photocatalyst yields typical core–shell nanosheet morphology with a mesoporous structure, exhibiting excellent photodegradation and mineralization efficiency for organic pollution.
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MOLECULES
·
2023
·Vol. 29
·期 1
·144
·
IF 4.6
Tao Tian,Jie Zhang,Lijiang Tian,Sijie Ge,Zhenyu Zhai
Visible-light-enhanced TiO2nanocatalysts doped with Cu and Fe were synthesized using the sol–gel method to investigate their performance in degrading gaseous benzene. The structure and morphology of mono- and co-doped TiO2(i.e., Cu/Fe-TiO2, Cu-Fe-TiO2) were characterized using SEM, EDS, XRD, BET, Raman, UV-vis-DRS, and XPS techniques. The results indicated that the presence of Cu/Fe mono- and co-doped TiO2leads to the formation of an anatase phase similar to pure TiO2. Furthermore, the introduction of Cu/Fe enhanced the presence of lattice defects and increased the specific surface area of TiO2. This enhancement can be attributed to the increase in oxygen vacancies, especially in the case of Cu-Fe-TiO2. Additionally, Cu-Fe-TiO2showed a higher concentration of surface-bound hydroxyl groups/chemically adsorbed oxygen and a narrower bandgap than pure TiO2. Consequently, Cu-Fe-TiO2exhibited the highest photocatalytic performance of 658.33 μgC6H6/(g·h), achieving a benzene degradation rate of 88.87%, surpassing that of pure TiO2(5.09%), Cu-TiO2(66.92%), and Fe-TiO2(59.99%). Reusability tests demonstrated that Cu-Fe-TiO2maintained a high benzene degradation efficiency of 71.4%, even after five experimental cycles, highlighting its exceptional stability and reusability. In summary, the addition of Cu/Fe to TiO2enhances its ability to degrade gaseous benzene by prolonging the catalyst’s lifespan and expanding its photoresponse range to include visible light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Xiaohong Hu,Jin Yuan,Zhuang Liu,Jinxing Mi,Houlin Wang,Shangchao Xiong,Jianjun Chen
TiO 2 crystal phase regulates oxide-support interaction strength in CeO 2 /TiO 2 . • Rutile-derived interfaces show stronger Ce-to-Ti charge transfer and higher Ti 3+ fractions. • CeO 2 /TiO 2 -R has lower oxygen-vacancy formation energy and enhanced oxygen activation. • 90% toluene conversion occurs approximately 70 °C lower on CeO 2 /TiO 2 -R than on CeO 2 /TiO 2 -A. Controlling the oxide–oxide interface is crucial for designing efficient oxide catalysts for volatile organic compound (VOC) oxidation, yet how the TiO 2 crystal phase regulates oxide-support interaction remains poorly understood. Here, CeO 2 supported on rutile (R) and anatase (A) TiO 2 was investigated as a model system for toluene oxidation. CeO 2 /TiO 2 -R exhibits markedly higher activity than CeO 2 /TiO 2 -A, with the temperature required for 90% toluene conversion lowered by approximately 70 °C. High-resolution transmission electron microscopy and quasi- in situ X-ray photoelectron spectroscopy show that the rutile-derived CeO 2 /TiO 2 interface exhibits stronger interfacial coupling and more pronounced electron redistribution between CeO 2 and TiO 2 , accompanied by a higher Ti 3+ -related contribution under oxidative conditions. In situ electron paramagnetic resonance measurements, together with density functional theory calculations, reveal enhanced oxygen activation at the CeO 2 /TiO 2 -R interface, associated with a lower interfacial oxygen-vacancy formation energy and promoted lattice‑oxygen activation as well as reactive oxygen species generation. Temperature-programmed infrared spectroscopy further shows faster turnover of toluene-derived oxygenated intermediates on CeO 2 /TiO 2 -R, with benzyl alcohol, benzaldehyde, and benzoate species identified along the reaction pathway, supporting an enhanced Mars–van Krevelen oxidation pathway enabled by enhanced oxygen activation. This work highlights crystal-phase engineering of oxide supports as an effective strategy to regulate oxide–oxide interfacial redox chemistry and improve VOC oxidation performance. Download: Download high-res image (496KB) Download: Download full-size image
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Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Lin Zhang,Jun Chen,Lai-Bo Song,Jun-Jie Pan,Qing Luo
Developing effective and stable photocatalysts for organic pollutants degradation are still a big challenge in practical water treatment now. In this work, La doped ZnO–TiO 2 composite (La/ZnO–TiO 2 ) were successfully fabricated by using PVP modified ZIF-8/TiO 2 as template via the absorption and pyrolysis routes. All as-fabricated materials were analyzed by XRD , SEM, TEM , BET, XPS , UV–vis absorption spectra and ESR spectra. PVP modified ZIF-8/TiO 2 was fully transferred into ZnO–TiO 2 after being pyrolyzed at high temperature under air atmosphere. The doping of La can make ZnO–TiO 2 exhibiting red-shifted, which is attributed to the capture of photo-generated electrons by La, leading to the effective separation between photo-generated electrons and holes. Furthermore, the photocatalytic performance of all as-fabricated materials were explored by degradation of tetracycline (TC) solution under UV light irradiation. La/ZnO–TiO 2 exhibits excellent stability. And the photocatalytic degradation rate of La/ZnO–TiO 2 is 99.2%, which is even higher than ZnO (87.4%), ZnO–TiO 2 (87.4%), P25 (TiO 2 ) (92.7%). More than that, the effect of catalyst's dose, effect of TC concentration and effect of pH for TC degradation have been well explored. The excellent photocatalytic performance of La/ZnO–TiO 2 makes it possible to be applied for degradation of organic pollutants in practice.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Cong Fu,Lingfang Liu,Xuelin Fan,Guofeng Zhao
Tracking the concentrations of surface-reaching photoexcited charges in photocatalysis is of great importance to fundamental science. Herein, through combining in situ and time-resolved diffuse-reflectance infrared spectroscopy (DRIFTS), we report an adsorbed methanol species surface elementary reaction kinetic analysis method. This strategy allows us to track the concentration of surface-reaching photoholes in well-defined anatase TiO2 nanoparticles, and compare it with that of rutile TiO2 nanoparticles. The photocatalytic oxidation of adsorbed methanol species on different TiO2 crystal phase surface follows first-order reaction kinetics. Thus, the corresponding rate constants of adsorbed methanol species have been acquired, which could directly mirror the concentration of surface-reaching photoholes under light irradiation. Based on the specific value of the reaction rate constant of adsorbed methanol species on different TiO2 crystal phase surface, for the first time, it can be concluded that concentration of surface-reaching photoholes in anatase is nearly 3.3 times greater than that of rutile under light irradiation. These results newly illustrate why anatase usually exhibits higher photocatalytic activity than rutile. Meanwhile, this work highlights that probing molecules in a surface elementary reaction kinetic analysis based on in situ and time-resolved DRIFTS could be utilized as an effective method to track the concentration of surface-reaching photoexcited charges in photocatalysis as well as other similar kinds of catalytic processes.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Lijie Li,Shuangqing Li,Gaohong He,Minqiang Jiang,Zixuan Xu,Wenjun Zhang
As one of the essential treatments for bilirubin removal in clinical, hemoperfusion of bio-sorbents required efficacy, efficiency and biosafety. Dopamine of biocompatibility and spontaneous polymerization was herein proposed for the bilirubin-imprinted adsorptive polymers of selectivity, doped with TiO 2 of adsorptivity and Fe 3 O 4 as fixed magnets. Via electrostatic reaction and hydrogen bonding, the magnetic sorbents composed of polydopamine doped with TiO 2 removed bilirubin of 263.5 mg·g −1 non-homogeneously during 240 min. With a competitive adsorption coefficient (t N ) of 10.4, the magnetic sorbents also exhibited the decent blood compatibility of acceptable hemolysis ratio and plasma recalcification time. Prospectively, the TiO 2 -doped bilirubin-imprinted PDA cored with Fe 3 O 4 was potentially for bilirubin selective removal via hemoperfusion in clinic.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 46
·17483-17499
·
IF 4.5
Tang Qin,Chen Hui,Shen Jun
The flower-like MoS 2 /cotton fiber-derived TiO 2 (MoS 2 /CF–TiO 2 ) composites were successfully prepared through the bio-template method and hydrothermal reaction. The influence of TiO 2 morphology and content on the electromagnetic wave (EMW) absorption performance of the composites was explored. The enhancement effect and mechanism of the heterostructure formed by MoS 2 and CF–TiO 2 on the EMW absorption performance were analyzed. The results showed that when CF–TiO 2 was added with a titanium-molybdenum atomic ratio of 2:1, the MoS 2 /CF–TiO 2 composites reached the minimum reflection loss (RL) of − 42.4 dB at 6.4 GHz when the thickness was 4.0 mm. The strong EMW absorption performance of MoS 2 /CF–TiO 2 composites could be attributed to the improvement of impedance matching. The good interface contact between the tubular CF–TiO 2 and flower-like MoS 2 not only increased the specific surface area of the material, but also greatly improved the conductivity of the material, enhancing the conduction loss and various polarization losses.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Rixiang Su,Wei Su,Jinyun Cai,Lei Cen,Shanshan Huang,Yu Wang,Peiyuan Li
Although photodynamic therapy (PDT) has great advantages for the treatment of bacterial infections, photosensitizers (PSs) often have many disadvantages that limit their application. Improving the shortcomings of PSs and developing efficient PDT antimicrobial materials remain serious challenges. In this study, a nanocomposite drug (TiO 2 /curcumin/hydroxypropyl-cyclodextrin, TiO 2 /Cur/HPCD) was constructed and combined with konjac glucomannan to form composite films (TiO 2 /Cur/HPCD films, KTCHD films). The stabilities of TiO 2 and Cur were improved in the presence of HPCD. The particle size of TiO 2 /Cur/HPCD was approximately 33.9 nm, and the addition of TiO 2 /Cur/HPCD enhanced the mechanical properties of the films. Furthermore, TiO 2 /Cur/HPCD and KTCHD films exhibited good biocompatibility and PDT antibacterial effects. The antibacterial rate of TiO 2 /Cur/HPCD was 74.46 % against MRSA at 500 μg/mL and 99.998 % against E. coli at 400 μg/mL, while it was adsorbed on the surface of bacteria to improve the effectiveness of the treatment. In addition, studies in mice confirmed that TiO 2 /Cur/HPCD and KTCHD films can treat bacterial infections and promote wound healing, with a highest wound healing rate of 84.6 % in the KTCHD-10 films + Light group on day 12. Overall, TiO 2 /Cur/HPCD is a promising nano-antibacterial agent and KTCHD films have the potential to be employed as antibacterial and environment-friendly trauma dressings.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Hongying Li,Bicheng Zhu,Jian Sun,Haiming Gong,Jiaguo Yu,Liuyang Zhang
Compared to hydrogen production through pure water photocatalysis , the direct utilization of seawater for hydrogen production aligns better with the principles of sustainable development. Seawater, however, contains impurity ions like Na + and Cl − , which pose higher demands on photocatalysts . It is widely acknowledged that RuO 2 and TiO 2 demonstrate excellent stability in seawater . Consequently, this study focuses on the model system of RuO 2 -modified TiO 2 for investigating hydrogen production in simulated seawater. TiO 2 /RuO 2 nanofibers (NFs) were synthesized via a one-step electrospinning method, ensuring intimate contact between the two components. The hydrogen production activity of TiO 2 /RuO 2 NFs in simulated seawater nearly matches that in pure water. Remarkably, RuO 2 serves as an oxidation cocatalyst, effectively scavenging holes from the valence band of TiO 2 and enhancing the separation efficiency of electrons and holes. Interestingly, Cl − ions, similar to RuO 2 , contribute to reducing excess holes. This study lays the groundwork for future research into hydrogen production from seawater.
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ChemSusChem
·
2023
·
IF 8.4
Pu Zhang,Haihua Zeng,Decai Wen,Xiaoyu Sui,Zhuan Wang,Ying Wang,Hailong Chen,Yuxiang Weng,Jinlin Long
Graphical With the combination of surface organometallic chemistry and post-synthetic ligand exchange or calcination, the coordination environments of Ni sites were precisely manipulated to achieve a splendid improvement in hydrogen evolution reaction (HER) under visible-light irradiation. Thereinto, the 2,2′-bipyridine bonded Ni catalyst showed the optimum HER ability, 260 folds as Ni without ligand and 2.5 folds as 2-phenylpyridine bonded Ni catalyst. Solar hydrogen production at a high efficiency holds the significant importance in the age of energy crisis, while the micro-environment manipulation of active sites on photocatalysts plays a profound role in enhancing the catalytic performance. In this work, a series of well-defined single-site Ni-grafted TiO 2 photocatalysts with unique and specific coordination environments, 2,2′-bipyridine-Ni−O−TiO 2 (T−Ni Bpy) and 2-Phenylpyridine-Ni−O−TiO 2 (T−Ni Phpy), were constructed with the methods of surface organometallic chemistry combined with surface ligand exchange for visible-light-induced photocatalytic hydrogen evolution reaction (HER). A prominent rate of 33.82 μmol ⋅ g −1 ⋅ h −1 and a turnover frequency of 0.451 h −1 for Ni are achieved over the optimal catalyst T−Ni Bpy for HER, 260-fold higher than those of Ni−O−TiO 2 . Fewer electrons trapped oxygen vacancies and a larger portion of long-lived photogenerated electrons (>3 ns, ~52.9 %), which were demonstrated by the electron paramagnetic resonance and femtosecond transient IR absorption, correspond to the photocatalytic HER activity over the T−Ni Bpy. The number of long-lived free electrons injected from the Ni photoabsorber to the conduction band of TiO 2 is one of the determining factors for achieving the excellent HER activity.
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