NANOTECHNOLOGY
·
2022
·Vol. 33
·期 50
·505602
·
IF 3.953
Fan Fang,Haochen Liu,Zuoliang Wen,Chenxi Liu,Bing Xu,Zhikuan Zhang,Kai Wang,Mehmet Ertugrul,Wei Lei,Xiao Wei Sun
Colloidal quantum dots (QDs) are promising luminescent materials for display and lighting, but their stability has long been an issue. Here, we designed a passivation strategy of doping Ti ions into the shell of alloyed CdZnSeS@ZnS QDs. The results showed that Ti ions were successfully doped into the ZnS shell and the stability of QDs was improved. In the aging test, the Ti ions doped QDs maintained 51.4% of the initial performance after 90 h of aging, while the pristine QDs decreased to less than 25% of the initial value. In addition, we discuss the reasons why Ti ions doping improves the stability of QDs. Ti ions are found to form Ti–S bonds in the ZnS shell, which has high binding energy and strong oxidation resistance. Most importantly, since there is no external physical insulating coating, the optimized QDs can also be directly used in electroluminescent devices, showing great potential in electroluminescence applications.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 36
·17481-17490
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IF 4.682
Mo Peicheng,Chen Jiarong,Chen Chao,Hu Qiaofan,Pan Xiaoyi,Xiao Leyin,Lin Feng
Polycrystalline cubic boron nitride (PCBN) was synthesized at high temperature and ultra-high pressure, using cBN, TiN, AlN and Ti as starting materials. The effects of CBN content (48–63 wt%) and sintering temperature (1300–1600 °C) on the composition, microstructure and mechanical properties of PCBN materials were studied. X-ray diffraction and scanning electron microscope were used to analyze the phase composition, microstructure and surface crack morphology of PCBN. At the same time, the compactness, microhardness, fracture toughness and flexural strength of PCBN were tested. Research shows that the phase components of PCBN samples are mainly composed of BN, TiB 2 , TiN and AlN. Almost all Ti reacts with cBN during the sintering process to form TiN and TiB 2 phases. When the sintering temperature is 1500 °C, the reaction has been fully completed. When the cBN content increases from 48 to 63 wt%, the relative density, flexural strength and hardness of PCBN increase with the increase in cBN content. When sintered at 1500 °C and the cBN content is 63 wt%, the relative density, flexural strength, fracture toughness and microhardness of the composite are 99%, 820.8 MPa, 6.6 MPa.m 1/2 and 3362 Hv, respectively.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Shenghao Zhao,Tianqi Wang,Zhijiao Ji,Yajun Song,Yi Li,Jia Liu,Wenping Hu
Methanol electro-oxidation reaction (MOR) is the kernel of methanol fuel cell. When the multi-step microscopic transformations process of MOR couples and occurs on the same active site, undoubtedly it reduces the probability of reaction and increases the steric hindrance, resulting in slow reaction kinetics and degradation of catalytic performance. In order to decouple the dehydrogenation and CO oxidation in MOR, herein we synthesized the hierarchical catalyst (NiCo/N-TiO 2 @NaOH) with bifunctional spatial distribution, which displayed 73 mA cm −2 at the potential of 1.5 V (vs. RHE) and only 20 % degradation of performance after continuously electrolysis over 40,000 s. Based on analysis of mass transfer and electron transport in hierarchical structure, combining with in-situ mass spectrometry and theory calculation, the high MOR performance of NiCo/N-TiO 2 can be ascribed to the spatial decoupling the MOR reactions including dehydrogenation under synergic effect of Ni/Co and CO oxidation on N-TiO 2 film.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qiong Li,Hao Qian,Tianyang Zheng,Xiaoyuan Sun,Yunfei Liu,Yinong Lyu
The cation displacement closely related to the local symmetry and corner-connected oxygen octahedral rotation are the structural origin of macroscopic properties in ABO 3 perovskite oxides. This work describes in detail the relationship between microstructure and macroscopic properties in 0.78BT-0.12CT-0.1BZS ceramic, which achieves the enhanced strain of 0.19 % with a hysteresis of 6.56 %. The atomic level structure is revealed by aberration corrected scanning transmission electron microscope (AC-STEM). The AC-STEM HAADF images reveal the coexisting of polar nanoregions with O and T symmetries. Such a microstructure has a lower energy barrier, facilitating dynamic polarization rotation flexibly under external stimuli. The AC-STEM ABF image reveals the existence of the BO 6 octahedral rotation, with rotation patterns of the a 0 b 0 c 0 and a - b + c - , and rotation angles are quantitatively measured. The BO 6 octahedral rotation and cation displacement are found to be consistent, the greater octahedral rotation with greater cation displacements. These results have important implications for understanding the structural origin of the excellent properties in ferroelectrics .
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Cuilin Meng,Qiongfang Zhuo,Anqi Wang,Jingjing Liu,Zehong Yang,Junfeng Niu
In this study, TiO 2 nanotube arrays (TiO 2 -NTA) were used as an intermediate layer to provide effective electrocatalytic activity and stability for Ti/TiO 2 -NTA/Ti 4 O 7 anode. Compared with Ti/Ti 4 O 7 anode, Ti/TiO 2 -NTA/Ti 4 O 7 anode exhibited higher oxygen evolution potential (2.40 V), larger active specific surface areas (1.81 m 2 g −1 ), stronger radical generation capacity (64.42 μM), longer accelerated service life (56.0 h), and superior favipiravir removal ratio. The flow-through electrochemical reaction system was constructed by using the porous Ti/TiO 2 -NTA/Ti 4 O 7 anode. The removal ratio, TOC removal ratio and mineralization current efficiency of favipiravir in the flow-by electrochemical system were significantly improved and the energy consumption was reduced compared with the conventional flow-by electrochemical system, verifying the superiority of the porous flow-through Ti/TiO 2 -NTA/Ti 4 O 7 anode. The effects of operating parameters on the removal of favipiravir in the flow-through electrochemical reaction system were investigated. The degradation mechanisms of favipiravir are the synergetic effects of the free radical (·OH and SO 4 − ·) and the direct electron transfer. Ti/TiO 2 -NTA/Ti 4 O 7 anode displayed excellent stability in five consecutive cycles, exhibited significant removal ratio (87.7%) of favipiravir from actual wastewater, and remained efficient and versatile for a wide range of typical PPCPs pollutants. Therefore, Ti/TiO 2 -NTA/Ti 4 O 7 is a promising porous anode material in the engineering application.
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ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Yong Cheng,Han-Qing Zhao,Aqiang Ding,Fei Chen,Jun Liu,Dazhi Fang,Chenglong Li,Yongkui Huang,Peili Lu
The widespread application of quaternary ammonium compounds (QAC) has posed a serious hazard to the environment and human being, and high concentration of Cl − in QAC wastewater may further increase the difficulty of pollutants elimination . In this study, such a QAC wastewater under high salinity conditions was chosen as the target, the prepared Ti/(Ru x Ir y )O 2 anode exhibited favorable catalytic performance for the oxidation and mineralization of QAC under high salinity conditions. Increasing the Ru/Ir ratio of Ti-based electrode coating also slightly promoted the inner catalytic capacity. The combination of electron paramagnetic resonance (EPR) and quenching experiments indicates that 1 O 2 served as a main reactive specie in the Ti/(Ru x Ir y )O 2 electrooxidation system. The increase of pH could decrease the removal efficiency of QAC for the reduced 1 O 2 yield, and the rise of Cl − concentration could favor the QAC oxidation, and Cl − was a better electrolyte to promote the oxidation of organic contaminants when compared to Na 2 SO 4 or Na 2 CO 3 . Additionally, the conversion pathway of the model pollutant was tentatively investigated, the results demonstrated that there were almost no halogenated final products residual by electrocatalytic oxidation with Ti/(Ru x Ir y )O 2 anode. This study not only elucidate the reaction mechanism of Ti/(Ru x Ir y )O 2 anode electrocatalytic oxidation of high salinity QAC wastewater, but also may provide an efficacious and eco-friendly method for the treatment of high salinity QAC wastewater.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Pijun Gong,Feng He,Junlin Xie,Haitao Wu
Zn species that exist in the flue gas are dangerous toxicants for SCR catalysts, which will seriously damage its catalytic activity and service life. Hence, the multi-layered nanosheets γ-Al 2 O 3 with (110) facets were introduced into the CeTiOx catalyst to improve the Zn-poisoning resistance performance. Benefiting from the structural and compositional merits, as well as the superior reducibility, abundant acid sites, and chemisorbed oxygen, the 3%Zn–Ce 0.3 -Al 0.4 -Ti catalyst with multi-layered nanosheets structure exhibits excellent NH 3 -SCR activity, over 90% NO conversion between 240 °C and 340 °C. In addition, in situ DRIFTS results suggest the SCR reaction mainly follows L-H and E-R mechanisms on 3%-Ce 0.3 -Al 0.4 -Ti samples, result from the multi-layered nanosheets γ-Al 2 O structure improves the BET specific surface area and Ce 3+ , promotes the adsorption/activation of more NH 3 and NOx species. More interestingly, compared with CeO 2 and TiO 2 the Zn species prefer to absorbed on nanosheets γ-Al 2 O 3 with (110) facets, so it can effectively protect CeO 2 from poisoning as a sacrificial agent .
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Catalysts
·
2023
·Vol. 13
·期 5
·817
·
IF 3.9
Haoyu Yuan,Chao Zhang,Wenjing Chen,Yuzhou Xia,Lu Chen,Renkun Huang,Ruiru Si,Ruowen Liang
Metal–organic frameworks (MOFs) are new porous materials composed of metal centers and organic ligand bridges, which received great attention in the field of photocatalysis. In this work, Ag2CrO4@MIL–125(Ti)–NH2(denoted as AgCr@M125) Z–scheme heterojunctions were synthesized via a simple microemulsion method, by which highly dispersed nano–sized Ag2CrO4can be anchored uniformly on the surfaces of porous MIL–125(Ti)–NH2(denoted as M125). Compared with pure M125 and Ag2CrO4, the as–prepared AgCr@M125 hybrids show significant photocatalytic efficiency against inactivatedStaphylococcus aureus(S. aureus), reaching over 97% inactivation of the bacteria after 15 min of visible light irradiation. Notably, the photocatalytic activity of the obtained 20%AgCr@M125 is about 1.75 times higher than that of AgCr–M125, which was prepared via a traditional precipitation method. The enhanced photocatalytic antibacterial activity of the AgCr@M125 photocatalytic system is strongly ascribed to a direct Z–scheme mechanism, which can be carefully discussed based on energy band positions and time–dependent electron spin response (ESR) experiments. Our work highlights a simple way to enhance the antibacterial effect by coupling with Ag2CrO4and M125 via a microemulsion–assisted strategy and affords an ideal example for developing MOFs–based Z–scheme photocatalysts with excellent photoactivity.Keywords:MIL–125(Ti)–NH2;Ag2CrO4;S. aureus;Z–scheme;microemulsion method
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ACS Applied Electronic Materials
·
2023
·
IF 4.7
Zhiyuan Chen,Peipei Han,Wenhui Chen,Zhi Wan,Jizhou Yang,Zhigang Liu,Peng Hu,Feng Teng,Haibo Fan
In recent years, Ga2O3 flexible solar-blind ultraviolet photodetectors (UVPDs) are gradually becoming the focus of research and the industry because of their excellent wearability, low manufacturing cost, portability, large area compatibility, and high scalability. However, the crystallization temperature required for high-quality α-phase Ga2O3 films exceeds the heat resistance of most flexible materials, so the growth of Ga2O3 films on flexible substrates is a very big challenge. In this study, a highly ordered α-Ga2O3 nanorod array and flexible solar-blind UV PDs with excellent performance were successfully prepared on a flexible titanium (Ti) substrate at 500 °C by a simple water bath heating method. When irradiated by 254 nm ultraviolet light, the α-phase Ga2O3 flexible photodetector exhibits an excellent self-power optical response at 0 V bias and exhibits excellent photoelectric performance with a responsivity of 15.3 mA/W, a fast rise and fall time of 0.104 and 0.077 s, a photocurrent density of 45.7 μA/cm2, and a high detectivity of 13.8 × 109 Jones. Bending and repeating experiments demonstrated that the detector had high stability. This study provides a simpler and less expensive method for the preparation of flexible self-powered α-Ga2O3 solar-blind UV photodetectors.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yan Du,Xiaohan Li,Limei Cao,Ji Yang
Although mercury is one of the heavy metal pollutants that endanger human health and the environment, it is also an essential raw material needed for industrial development. We try to use electrochemical reduction method to realize the resource utilization of mercury. MoS 2 @Ti electrodes were prepared using a one-step solvothermal method, and XRD, XPS, SEM and EDS were used to analyze the MoS 2 powder. The prepared highly reactive MoS 2 @Ti electrode was used as a cathode to electrochemically reduce the mercury-containing solution. After a series of single-factor experiments, under the conditions of stirring rate of 400 r/min, electrode spacing of 20 mm, constant potential of 2 V and electrolytic time of 2 h, the removal efficiency of Hg 2+ in 10 ∼ 50 mg/L HgSO 4 -10 % H 2 SO 4 solution reached 94.5 % or above. The reaction mechanism of MoS 2 @Ti was investigated mainly by using the indirect reaction of superoxide radicals and hydrogen radicals to achieve the reduction of Hg 2+ . And the MoS 2 @Ti electrode can still reach 80.0 % removal efficiency after five times of repeated use. A neural network model was used to predict the efficiency of Hg 2+ reduction in this system with a high accuracy of RMSE 1.3049 and R 2 0.9511. The above study contributes to the realization of the resource utilization of mercury.
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FUEL
·
2023
·
IF 7.4
Yiqing Zeng,Weilong Rong,Shule Zhang,Qin Zhong,Zhaoxiang Zhong
Synergistic control of multiple pollutants has high benefits during the control of emissions from fuel utilization, and catalysis can contribute to efficient removal of multiple pollutants. In this work, Ti species regulated CuO/CeO 2 (Cu/Ce) catalyst was constructed to efficient simultaneous NH 3 -SCR denitration and CO oxidation under oxygen-rich conditions. It is found that the introduction of Ti species into Cu/Ce catalyst induces the formation of three-dimensional pore structure and promotes the phase transition from crystalline to amorphous, which significantly enhances the specific surface area and the dispersion of CuO and CeO 2 . The well dispersed CuO and CeO 2 species provide a larger number of adsorbed sites for CO and NO and enhance the Cu-Ce interaction, which can contribute to reducing the competitive adsorption between CO and NO and the formation of a richer surface oxygen vacancies. Owing to above improvements, the Ti species regulated Cu/Ce catalyst can achieve more than 90% removal efficiency of NO x and CO at 148–218 °C, and the active temperature windows widened by 36 °C in comparison with Cu/Ce catalyst. Through this work, we expect to shed some light on the synergistic control of CO and NO x under oxygen-rich conditions.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Liu Yang,Jing Li,Guoqiang Cao,Yiyan Yang,Wen Luo,Zhiqi Zhang,Lizhi Feng,Xinglai Zhang,Baodan Liu
This study reports on the development of highly-efficient Pt/CuO-Fe 2 O 3 /TiO 2 monolithic catalysts for the low-temperature conversion of NO to N 2 via CO-SCR. In this case, ultrathin TiO 2 nanosheet arrays are designed to in situ grow on flexible Ti mesh to provide more spaces/areas for the loading of highly-dispersed Fe 2 O 3 and CuO active components. Furthermore, Pt nanoparticles with an average size of 1.30 nm are effectively decorated on the surface of CuO-Fe 2 O 3 /TiO 2 . The H 2 -TPR and NO-TPD results demonstrate that the excellent synergistic effect between TiO 2 , CuO, Fe 2 O 3 and trace amounts of Pt is conducive to enhance the adsorption of NO and finally promote the CO-SCR. The obtained Pt/CuO-Fe 2 O 3 /TiO 2 catalysts exhibit excellent CO-SCR performance with 100 % NO conversion, and 100 % N 2 selectivity at 250 °C, showing great potential of de-NO x application by using toxic CO as reductant in industry.
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