Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 32
·11027-11033
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IF 6.4
Yin Jiang,Zhaoyang Wang,Qihang Zhou,Peizhi Yang,Peng Qin,Fuqiang Huang,Wen Yang
TiO2 nanomaterials are cheap and stable candidates for the photocatalytic degradation of antibiotic residues in water. However, their activity is still limited by insufficient photon absorption and charge extraction. Here, ruthenium-doped mesoporous TiO2 crystals (Ti1−xRuxO2−y) are prepared by corroding a step-like layered K2Ti8−xRuxO17 precursor. The removal of potassium ions and the reconfiguration of [TiO6] octahedrons in K2Ti8−xRuxO17 lead to the formation of mesoporous crystals. Meanwhile, the addition of Ru3+ can create Ti3+ species and oxygen vacancies in situ inside the crystals, extending the photon absorption from the UV to the whole visible region. The mesoporous Ti0.95Ru0.05O2−y crystals show a 98.74% degradation efficiency of tetracycline hydrochloride within 50 min under simulated sunlight (AM 1.5 G 100 mW cm−2) illumination. This work offers an effective way for the construction of efficient photocatalysts with high photon absorption and charge extraction simultaneously.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yanni Guo,Jiayao Qi,Fei Wang,Binbin Fan,Wenming Hao,Ruifeng Li
Two industrial Y zeolites were treated sequentially by steaming and citric acid to investigate the Al migration and acidity of the modified Y zeolites. Even though the two parent Y zeolites displayed similar properties including crystallinity, Si/Al ratio, and textural structure, they showed different acidic and textural properties upon identical post-treatments by steaming and citric acid due to the different Al migration rules, resulting in their different activity and cracking ability in the methylcyclohexane transformation. Steaming treatment performed the prominent dealumination, leading to the increase of the framework Si/Al ratio from ca. 2.5 to ca. 5.0 and the formation of extra-framework Al species. During steaming treatment, the dealumination is related with the transformation from Al(IVb) to Al(V). The following citric acid leaching hardly removed the framework Al but removed the extra-framework Al species that existed in the form of Al(V) readily and some residual Na+ ions. The remaining framework-associated Al species are related to the generation of Lewis acid sites.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yu Jiang,Marhoun Ferhat,Wenhao Fan,Shaoping Chen,Yachao Wang,Jie Chen,Rasha Abdullah Ahmed Al-Yusufi,Chaochao Dun
Additional cation doping is one of the potential strategies to enhance the thermoelectric (TE) performance of Mg 3 Sb 2 -based materials with precise regulation of interaction between cations and the host. In this work, using Mg 3 Sb 1.5 Bi 0.5 as an example, we confirmed that co-doping rare-earth elements with Y and La is capable to simultaneously improve its power factor and suppress the thermal conductivity : Y is an effective n -type dopant to regulate the optimal carrier concentration, while La doping can modulate the band structure and increase the effective mass that related to the improved Seebeck coefficient . A promising power factor of 18.3 μW cm -1 K -2 is obtained after co-doping. Meanwhile, the lattice thermal conductivity is dramatically reduced to 0.39 W m -1 K -1 at 750 K thanks to the extra defect scattering introduced by Y and La. As a result, a peak figure of merit ( zT ) of 1.76 and a competitive average zT of 1.1 among 300–750 K are achieved in Mg 3.2 Y 0.04 La 0.01 Sb 1.5 Bi 0.5 . The synergistic effect stemming from dual-cations doping provides profound insights for controllable host-dopant design and modulation toward high-efficient n-type TE materials .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Wei Guo,Huanhao Chen
Nonthermal plasma (NTP)-assisted CO2 methanation can activate and convert stable CO2 molecules under ambient conditions as compared to conventional thermal catalysis (normal operation temperature up to 450 °C), which is a good technique to reduce CO2 emissions and simultaneously utilize the renewable energies like solar and wind. It is critical to develop a robust catalyst with good catalytic performance in order to make NTP catalytic CO2 methanation more competitive. Herein, we present a simple yet efficient synthesis of CeO2-supported Ni catalysts with yttrium (Y) as the promoter (i.e., Ni–Y/CeO2) via mechanochemical synthesis for efficient NTP catalytic CO2 methanation. The developed 7.5Ni–1Y/CeO2 catalyst demonstrated the highest energy efficiency values for CO2 conversion and CH4 yield, i.e., ∼57 gCO2 kWh–1 and ∼17 gCH4 kWh–1, respectively. The CO2-TPD and HRTEM results confirmed that the doped Y positively enhanced the basicity of the catalysts and also decreased the particle size of Ni nanoparticles, thus promoting the NTP catalytic activity of CO2 methanation. The catalyst displayed excellent short-term stability for plasma catalytic CO2 methanation over a 12 h on-stream evaluation, showing a CO2 conversion of 84.2 ± 1.8% and a CH4 selectivity of 83.3 ± 1.9%.
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MINERALS ENGINEERING
·
2023
·
IF 4.8
Lingyun Fei,Xin Ma,Hongyu Sun,Shuai Wang,Zhanfang Cao,Hong Zhong,Lanqing Deng
High consumption and low selectivity of traditional collectors limit the efficient flotation recovery of rhodochrosite particles from finely disseminated complex ores. Herein, a novel “Y” structure multi-functional surfactant, 2-decanoylamino-4-hydroxycarbamoyl-butyric acid (DHBA) was developed for flotation recovery of rhodochrosite. The micro-flotation results showed that DHBA exhibited an excellent collecting ability for rhodochrosite than common collector octanohydroxamic acid (OHA) (the recovery reached 85.7% for 7 × 10 – 5 mol·L – 1 DHBA, while only 27.9% for OHA). Meanwhile, DHBA can selectively separated rhodochrosite from quartz at neutral pH and low collector dosages. The experimental analysis combined with the density functional theory calculations revealed that DHBA was lattice matched to the rhodochrosite via the oxygen atoms of carboxyl and hydroxamate groups chelating with two Mn atoms, conferring strong adsorption affinity of DHBA. In addition, intermolecular hydrogen bonds coexist through the amide groups, promoting the collectors' self-assembly on the rhodochrosite surface, improving surface hydrophobicity. This research provides a feasible collector design protocol for the separation and enrichment of manganese carbonate ore.
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CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
You Ma,Chunying Zhu,Taotao Fu,Youguang Ma,Huai Z. Li
Dynamics of non-Newtonian droplet (CMC aqueous solution) breakup with partial obstruction in microfluidic Y-junction was visually investigated. Three breakup stages were found: squeezing, transition and pinch-off. The effects of the concentration c of CMC, continuous capillary number Ca c and dispersed phase local capillary number Ca d on droplet breakup were studied. In squeezing stage and transition stage, the breakup process could be promoted by increasing Ca d or decreasing c . The pinch-off stage relied primarily on the surface tension and was almost independent of inertial force and viscous force. For the shear thinning non-Newtonian droplet, the length of the daughter droplet was always linearly stretched with time until breakup and the maximum gap width increased with Ca c , but decreased with the increases of c and Ca d .
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Reaction Kinetics Mechanisms and Catalysis
·
2020
·Vol. 132
·期 1
·417-429
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IF 1.52
Xie Qi,Miao Changxi,Lei Tianqi,Hua Weiming,Yue Yinghong,Gao Zi
Dehydrogenation of ethane assisted by CO 2 has been investigated over Au catalyst supported on Y-doped CeO 2 nanorod. The catalysts were characterized by XRD, TEM, N 2 adsorption, XPS, TG, H 2 -TPR and Raman spectroscopy. Enhanced activity can be obtained after the proper Y doping. The optimal catalyst Au/Ce 0.9 Y 0.1 exhibits an ethane conversion of 20.9% and nearly 100% selectivity to ethylene without any evident tendency of deactivation in 50 h. The reducibility of surface oxygen species is found to play a key role in the dehydrogenation assisted by CO 2 , which can be improved by proper Y doping into CeO 2 nanorod. The promoting effect of CO 2 on activity is evident over Au/Ce 0.9 Y 0.1 catalyst, due to the quick transformation of H 2 product into H 2 O by the reverse water gas shift reaction. The catalyst stability is also improved by the addition of CO 2 , attributed to the elimination of coke by Bouduoard reaction.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
J. Yi,M.L. Li,H.X. Zhou,Andreas Rosenkranz,B. Wang,H. Song,N. Jiang
Chemical vapor deposition (CVD) is an efficient approach to prepare coatings on complex cutting tools. However, MoS 2 with self-lubrication ability and excellent tribological properties fabricated by CVD have been rarely reported in literature. The aim of this study was to deposit pure MoS 2 coatings and yttrium (Y) doped MoS 2 (Y/MoS 2 ) composite coatings on cemented carbide blades coated with titanium nitride by CVD. The structural and mechanical properties of the coatings were examined by scanning electron microscopy (SEM) and nanoindentation , respectively. The results demonstrated that the microstructure of Y/MoS 2 composite coatings was denser than that of the pure MoS 2 coating. The hardness and the adhesional properties were significantly enhanced for the Y/MoS 2 composite coatings. The tribological performance of the as-deposited coatings were investigated under atmospheric environment. Y/MoS 2 compostite coatings demonstrated an enhanced tribological performance with a stable and low coefficient of friction (COF) over the entire sliding time. In contrast, the COF of pure MoS 2 coating dramatically increased to value above 0.3 after a sliding time of only 30 min. Additionally, the Y/MoS 2 composite coatings showed a decreased wear rate (8.36 ± 0.29 × 10 −7 mm 3 /Nm) compared to the pure MoS 2 coatings (3.41 ± 0.48 × 10 −5 mm 3 /Nm) thus reflecting an improvement by two order of magnitude.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Honghong Lei,Peng Jiang,Bin Li,Yuncheng Zhou,Rui Zhang,Jianlei Kuang,Wenbin Cao,Wei Wang
The (S, N) co-doped Ba 2 In 2- x Cr x O 5+ y (0 ≤ x ≤ 0.5) oxides are successfully obtained by mixing the Ba 2 In 2- x Cr x O 5+ y oxides and thiourea through a simple ball milling method followed by sintering at 400 °C for 3 h. The colors of the compounds change from orange-brown to yellow-green after reacting with thiourea. When Cr amount is small ( x = 0.1), the crystal structure of (S, N) co-doped Ba 2 In 2- x Cr x O 5+ y is orthorhombic Ba 2 In 2 O 5 phase. When x ≥ 0.3, the crystal structure of the sample is cubic BaInO 2.5 phase. And this phase transition is the same as Ba 2 In 2- x Cr x O 5+ y . XPS results reveal that Cr 6+ in Ba 2 In 2- x Cr x O 5+ y (0 ≤ x ≤ 0.5) oxides are reduced to Cr 3+ after sintering. S exists in both cation and anion forms, and N exists in substitutional forms. UV–Vis analysis indicates that the yellow-green hue comes from the d-d transition of Cr 3+ , and the doping of S, N ions leads to a red shift of the absorption edge of the samples.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Jiaojiao Zhou,Wenjing Wang,Shuojun Li,Axiu Nie,Zhiyong Song,Mohamed F. Foda,Zhicheng Lu,Ling Zhao,Heyou Han
An innovative fluorescent and colorimetric dual-mode strategy based on Y-shaped DNA was proposed for the detection of rabies virus oligonucleotide. The cascade assembly of hairpin probes was initiated by the target, leading to the formation of Y-shaped DNA accompanied by freeing target to catalyze the next assembly process. The fluorescence recovery of the fluorophore FAM was accompanied by opening of hairpin probe. A colorimetric signal was generated by the proximity of glucose oxidase (GOx) and horseradish peroxidase (HRP), which was reflected by enhanced catalytic capability to TMB. Using this method, target DNA can be detected with a wide linear range from 0.1 to 6 nM with a detection limit of 15 pM, and from 0.5 to 60 nM with a detection limit of 60 pM for fluorescent and colorimetric readout, respectively. Moreover, the dual-mode detection strategy exhibited excellent selectivity towards the target compared with interference oligonucleotides. In addition, recoveries ranging from 96.0% to 106% with RSD values varying from 3.2% to 5.4%, and from 91.0% to 102% with RSD values varying from 3.3% to 7.1% for fluorescent and colorimetric studies, respectively, were obtained in diluted cerebrospinal fluid samples. The proposed dual-mode sensor is easy to operate with excellent detection performance. It would be superior to single mode detection and more practicable for quantitative detection of nucleic acid-related biomarkers due to the self-correction capability.
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Hua-Yu Zhang,Jiu-Li Wen,Qi Shao,Ai Yuan,Hai-Ting Ren,Fang-Ying Luo,Xiao-Liang Zhang
La/Y-codoped microporous organosilica membranes were successfully fabricated by sol-gel procedure with 1,2-bis(triethoxysilyl)ethane (BTESE) as silica precursor for efficient desalination. The rare earth elements were confirmed to be doped into silica frameworks during the sol-gel procedure by various characterizations, which would decrease particles size and size distribution of BTESE-derived sols and form hydrothermally stable Si–O–RE (RE for La and Y) bonds. It could significantly influence membrane surface morphology , microstructure properties and hydrophilcity of La/Y-codoped membranes, and then improve their desalination performance. Under the optimized preparation conditions, La 25 Y 75 -SiO 2 (La:Y = 25:75, mol%) membranes exhibited the highest water flux of 10.3 kg m −2 h −1 and NaCl rejection of nearly 100% towards 3.5 wt% NaCl feed solution even at room temperature of 25 °C. It was attributed to strongest hydrophilcity, finest microstructure, and lowest mass resistance of water permeation for La 25 Y 75 -SiO 2 membranes. Moreover, such these organosilica membranes demonstrated good stability for 200 h simulated seawater desalination tests without any significant changes of separation performance and promising hydrothermal durability under various salts solutions with different concentrations at 25–60 °C.
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DYES AND PIGMENTS
·
2018
·
IF 3.767
Yuncheng Zhou,Peng Jiang,Honghong Lei,Yong Li,Wenbin Cao,Jianlei Kuang
BaAl 2-x Mn x O 4+y (0 ≤ x ≤ 0.10) showing intense turquoise to green colors were prepared by the sol-gel method from metal nitrides as precursors and followed by a thermal treatment at 900 °C. The X-ray diffraction of all of the as-synthesized samples are indexed with BaAl 2 O 4 stuffed tridymite structure. The oxidation state of Mn is confirmed to be +5 by X-ray photoelectron spectroscopy analysis. The colors of the samples are tuned to intense turquoise and green with the increase of Mn content . The optical properties are characterized by UV–Vis absorbance spectra and CIE L ∗ a ∗ b ∗ coordinates. The reason for the intense colors is due to the Mn 5+ doping in the [AlO 4 ] tetrahedral sites. The pigments are applied to poly(methyl methacrylate) (PMMA) and the colours of the polymer composite were characterized.
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