Catalysis Science & Technology
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2017
·Vol. 7
·期 3
·725-733
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IF 5.773
Ning Liu,Zhimin Wu,Meng Li,Shanshan Li,Yongfei Li,Rongdong Yu,Langsheng Pan,Yuejin Liu
Bimetallic Al–La oxides were conjointly precoated on SBA-15 prior to the introduction of potassium fluoride to achieve solid superbases at low temperature by a modified wetness impregnation method. This breaks the tradition of decomposition of KNO3 at high temperature and gives rise to a new approach to generating superbasic sites on SBA-15. The physico-chemical characteristics of the prepared KF/Al–La@SBA-15 materials were investigated using FT-IR, XRD, TG-DTG, N2 adsorption–desorption, TEM, SEM-EDS, acid–base titration, Hammett indicators and CO2-TPD measurements. The results demonstrated that the addition of Al species promoted the dispersion behavior of La species inside the channels, and the bimetallic species could synergistically protect the mesoporous structures of SBA-15 against KF corrosion. With increasing Al content, KF/Al–La@SBA-15 exhibited a long-range ordering of the pores with relatively narrow pore size distribution as well as high specific surface area. The research results showed that the KF/Al–La@SBA-15 (0.4) catalyst possessed a total basicity up to 0.79 mmol g−1 and superbasicity with a strength of 26.5. The catalytic activity of the prepared materials was evaluated in the ring-opening reaction of propylene oxide with methanol. Compared with the SBA-15 supported monometallic oxide (Al or La) catalysts, KF/Al–La@SBA-15 (0.4) exhibited the highest catalytic activity for the ring-opening reaction of propylene oxide with methanol. This is associated with the synergistic effects between Al and La species and the high dispersion of active components on the SBA-15 support.
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CHEMOSPHERE
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2016
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IF 3.698
Fan Bu,Baoyu Gao,Ruihua Li,Shenglei Sun,Qinyan Yue
Two kinds of aluminum-based coagulants and epichlorohydrin-dimethylamine (DAM-ECH) were used in the treatment of humic acid-kaolin simulated water by coagulation-ultrafiltration (C-UF) hybrid process. Coagulation performance, floc characteristics, including floc size, compact degree, and strength were investigated in this study. Ultrafiltration experiments were conducted by a dead-end batch unit to implement the resistance analyses to explore the membrane fouling mechanisms. Results showed that DAM-ECH aid significantly increased the UV 254 and DOC removal efficiencies and contributed to the formation of larger and stronger flocs with a looser structure. Aluminum chloride (Al) gave rise to better coagulation performance with DAM-ECH compared with poly aluminum chloride (PACl). The consequences of ultrafiltration experiments showed that DAM-ECH aid could reduce the membrane fouling mainly by decreasing the cake layer resistance. The flux reductions for PACl, Al/DAM-ECH (dosing both Al and DAM-ECH) and PACl/DAM-ECH (dosing both PACl and DAM-ECH) were 62%, 56% and 44%, respectively. Results of this study would be beneficial for the application of PACl/DAM–ECH and Al/DAM–ECH composite coagulants in water treatment processes.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2016
·
IF 2.477
Ran Li,Yin Zhao,Ruien Hou,Xin Ren,Shuai Yuan,Yanyan Lou,Zhuyi Wang,Dongdong Li,Liyi Shi
The optimization of charge transfer at the TiO 2 /dye/electrolyte interface is crucial to the design of dye-sensitized solar cells. In this paper, the Al doped TiO 2 layers were coated on the mesoporous TiO 2 films by a chemical bath deposition process, followed by sintering at 500 °C. Its performance as the TiO 2 /dye/electrolyte interface layer was investigated. The analysis results reveals that the Al doped TiO 2 coating can reduce the oxygen vacancy-Ti 3+ concentrations in the photoanodes significantly, which is beneficial to suppress the back electron transfer process from TiO 2 to electrolyte. Furthermore, the electron mobility of the modified photoanodes was increased. Consequently, the dye sensitized solar cells (DSSC) based on the photoanodes modified by Al-doped TiO 2 coating show an improvement on both enhancing the electron transport and suppressing the charge recombination process. The dye sensitized solar cell based on the photoanode modified by 1.0 mol% Al-doped TiO 2 layer, shows a power conversion efficiency as high as 7.66%, increasing 9.12% compared with the unmodified reference cell. Finally, our works show a facile and scalable technique to further optimize interfacial charge transfer process in dye sensitized solar cells.
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MATERIALS & DESIGN
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2016
·
IF 3.997
Chunpei Yu,Wenchao Zhang,Ruiqi Shen,Xing Xu,Jia Cheng,Jiahai Ye,Zhichun Qin,Yimin Chao
The performances of nanothermites largely rely on a meticulous design of nanoarchitectures and the close assembly of components. Three-dimensionally ordered macroporous (3DOM) NiO/Al nanothermite film has been successfully fabricated by integrating colloidal crystal template (CCT) method and controllable magnetron sputtering. The as-prepared NiO/Al film shows uniform structure and homogeneous dispersity, with greatly improved interfacial contact between fuel and oxidizer at the nanoscale . The total heat output of 3DOM NiO/Al nanothermite has reached 2462.27 J·g − 1 at optimal the deposition time of 20 min, which is significantly more than the values of other NiO/Al structural systems that have been reported before. Intrinsic reduced ignition temperature (onset temperature) and less gas production render the wide applications of 3DOM NiO/Al nanothermite. Moreover, this design strategy can also be readily generalized to realize diverse 3DOM structured nanothermites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Jinhui Hao,Wenshu Yang,Zhe Zhang,Baoping Lu,Xi Ke,Bailin Zhang,Jilin Tang
A facile simple hydrothermal method combined with a post-solution reaction is developed to grow interconnected three dimensional (3D) hierarchical Co-Al layered double hydroxides (LDHs) on reduced graphene oxide (rGO). The obtained 3D hierarchical rGO-LDHs are characterized by field emission scanning electron microscopy, X-ray diffraction, and X-ray photo-electron spectroscopy. As LDHs nanosheets directly grow on the surface of rGO via chemical covalent bonding, the rGO could provide facile electron transport paths in the electrode for the fast Faradaic reaction. Moreover, benefiting from the rational 3D hierarchical structural, the rGO-LDHs demonstrate excellent electrochemical properties with a combination of high charge storage capacitance, fast rate capability and stable cycling performance. Remarkably, the 3D hierarchical rGO-LDHs exhibit specific capacitance values of 599 F g −1 at a constant current density of 4 A g −1 . The rGO-LDHs also show high charge–discharge reversibility with an efficiency of 92.4% after 5000 cycles.
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PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2017
·
IF 2.589
K.Q. Song,Z.C. Lu,M. Zhu,R.Z. Hu,M.Q. Zeng
Nanocomposite Al–Sn-based bearing alloys produced by mechanical alloying (MA) exhibit high hardness; however, their poor sintering density and ductility limit their wide spread application. Here, we present a strategy to produce a dual-scale structure in an Al–Sn–Si alloy consisting of coarse and ultrafine grains through a combination of conventional powder sintering and thermomechanical treatment . We found that severe deformation and the presence of an Al–Si eutectic mixture for sample induced abnormal grain growth of Al to create the dual-scale Al–Sn–Si alloy through annealing treatment. An optimum matching of ductility and strength , and optimum wear performance were achieved at annealing temperatures of 500 and 550 °C. Detailed investigation of the wear mechanism revealed that the combination of high strength and high ductility provided by the dual-scale structure is a key factor for the improvement of the wear properties.
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THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Liang Yu,Lv Shen,Hongzhe Zhong,Ru Zhou,Min Hao,Juncheng Jiang
Polypropylene (PP) flammability poses great fire risks for its application. A metal-organic framework (MOF), NH 2 -MIL-53(Al), was synthesized and subsequently integrated into PP, the flame-retardant efficacy in conjunction with piperazine pyrophosphate (PAPP) and melamine cyanurate (MCA) was additionally examined. When the total mass fraction of the additives was 25 %, the limiting oxygen index (LOI) of PP composite reached 31.1 %, it also passed the UL-94 test with a V-0 rating. The peak heat release rate (pHRR) and the total heat release rate (THR) was reduced by 88.55 % and 79.75 %, respectively, compared with the pure PP. The char residual char percentage increased to 8.02 %. The Tensile Strength reached 30.1 MPa. The results indicate that adding NH 2 -MIL-53(Al) significantly enhanced the flame retardancy and thermal stability of PP composites, without significantly affecting their mechanical properties, which offers a novel potential direction for the advancement of polymer flame retardants (FRs).
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Jianan Shan,Gaoming Mo,Qing Sun,Jing Huang,Qin Ouyang,Qing Huang
SiC fiber is an important structural material in high-temperature extreme environments and nuclear energy applications. Oxidation and electron irradiation are main curing methods for the fabrication of industrial SiC fibers. In this work, a photo-sensitive polyvinylaluminocarbosilane (PVACS) is facilely prepared by blending polyaluminocarbosilane (PACS) and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi), which can be melt spun, cured by ultraviolet irradiation at room temperature. After thermal pyrolysis and sintering, the SiC(OAl) fibers with oxygen content of 8.84 wt% and C/Si ratio of 1.34, the SiC(Al) fibers with oxygen content of 0.29 wt% and C/Si ratio of 1.03 are achieved. The cured mechanism and the structural evolution from the precursor fiber to the final ceramic fibers is investigated. The results show that homopolymerization of D4Vi is the main curing mechanism in addition to the β-addition of hydrosilylation. Different from the typical oxidative curing, the oxygen in the fibers mainly comes from D4Vi. At about 800 ℃, the SiAl x O y phase, the SiC x O y phase and free carbon are formed. At 1200 ℃, the Al-C bonds possibly in Al 4 C 3 are formed. At around 1600 ℃, Al may exist mainly in the form of Al 4 O 4 C, and the amorphous carbon phase changes into crystalline graphitic structure. Meanwhile, a lot of mesopores and macropores in the SiC(OAl) fibers are formed due to thermal decomposition of the SiC x O y phase. However, at 1800 ℃, the SiC(Al) fibers densify again due to the formation of Al 2 OC and Al 4 SiC 4 phases, which also inhibit the growth of β-SiC and favor the formation of α-SiC.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Fuliu Yang,Yong Chen,Xiaochun Wu,Yufeng Da,Peipei Xiong,Chenxi Wu,Yue Du,Yuhang Shi,Junfeng Zhao,Yong Liu
Coagulation–Fenton oxidation stands as a prevalent method for organic pollutant removal from MBR effluent in landfill leachate. However, its dependence on intricate coagulant preparation and hazardous H 2 O 2 handling presents challenges in logistics. Herein, a novel Al 0 /C–N, Cl composite was developed via high-energy ball milling and high-temperature sintering, which facilitates in situ generation of H 2 O 2 and aluminum salt coagulant upon stirring in oxygen-containing aqueous solutions. Under conditions of 2 g/L Al 0 /C–N, Cl and initial pH 9, H 2 O 2 production achieved 459 mg/L within 1 h, yielding an Al 3+ /H 2 O 2 bifunctional reagent. Subsequent coagulation in MBR effluent and Fenton oxidation achieved removal efficiencies of 85.5 %, 76.4 %, and 99.3 % for UV 254 , total organic carbon, and chromaticity, respectively. The efficient degradation of refractory fulvic-like substances was obtained from this novel “coagulation–Fenton” hybrid process without additional coagulants and H 2 O 2 . These results illustrated that the hybrid process is a promising and efficient technology for the advanced treatment of landfill leachate.
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Materials Today Communications
·
2024
·
IF 3.7
Xianze Meng,Qianru Zhang,Xuantong Lv,Jiabo Chen,Yingzi Peng,Pengxuan Dong,Qingqing Sun
The corrosion inhibition performance of three amino acids, namely L-Phenylalanine (Phe), L-Methionine (Met) and L-Histidine (His) on 7150 Al alloy in 0.1 M HCl + 1 M NaCl solution was investigated by using electrochemical impedance spectroscopy (EIS), cyclic polarization, DFT and MD simulations. Electrochemical results indicate that all the studied amino acid inhibitors are cathodic type, and the inhibition efficiency follows the following order under all studied temperatures (25, 35 and 45 ℃): His > Met > Phe. A strong correlation between corrosion inhibition efficiency and DFT parameters is not evident, but the adsorption sites (N and O of NH 2 -COOH-, S atom of Met and two N atoms in the imidazolyl ring of His) can be determined by Fukui indices and Mulliken charges of the local atoms. In addition, MD simulations indicate that corrosion inhibition efficiency increases with the decreasing of adsorption energy.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Laigang Hu,Weiwei Wang,Xiaozeng Miao,Min Hu,Dong Luo,Wenhao Wu,Daohui Lin,Kun Yang
Benzene (Bz) vapor poses significant health risks to humans, even at trace concentrations. Additionally, the separation and recycling of Bz and cyclohexane (Cy) is challenging due to their similar kinetic diameters and boiling points. Developing an adsorption-separation material with stronger interactions with Bz than with Cy could serve as a viable strategy for trace Bz adsorption and Bz/Cy separation. In this study, we present a novel aluminum-based metal–organic framework, ZJU-521(Al), composed of tetrakis (4-carboxyphenyl)methane and a helical chain [Al 5 (OH) 7 (−COO) 8 ] ∞ , featuring a simple network of one-way rods and tetrahedra. This framework exhibited a uniform micropore size of 7.23 Å and a specific surface area of 1,248 m 2 g −1 , demonstrating excellent trace Bz adsorption (4.18 mmol g −1 ) at P/P 0 = 0.01, attributed to its straight channel and orthogonal-array pocket pore structure. The ideal adsorbed solution theory selectivity and separation factor values of ZJU-521(Al) for Bz/Cy were 22.50 and 6.20, respectively, indicating its potential as a material for Bz/Cy separation. Multicomponent simulations showed that Bz molecules were preferentially adsorbed in the pocket due to stronger interactions, such as Al–π interactions. Thus, ZJU-521(Al) exhibits stronger interactions with Bz than with Cy, facilitating effective Bz/Cy separation.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Lijia Huang,Ge He,Yi Yuan,Tian Cheng Zhang,Yan Wang,Shaojun Yuan
Rationally regulating the photogenerated carrier transfer behavior and band structure of TiO2 through metal doping is an effective strategy for enhancing the photocatalytic activity in the removal of malodorous gas hydrogen sulfide (H2S). In this study, TiO2 modified with the doping of Group IIIA metal ions (Al3+, Ga3+, and In3+) was utilized as an efficient photocatalytic desulfurizer under ultraviolet irradiation. Among these samples, the 4% In-TiO2 exhibited the best photocatalytic H2S removal efficiency of 100% for a duration of 120 min, nearly 3 times higher than that of commercial P25 TiO2. The UV–vis DRS and PL spectra demonstrated that the incorporation of Group-IIIA metal ions into TiO2 resulted in the formation of a shallow acceptor level above the valence band in the energy band structure, which induced a slight redshift at the edge of the visible light absorption band and reduced the electron–hole recombination rate. In situ DRIFTS and DFT calculations revealed that the adsorption and activation of H2S occurred simultaneously on In-TiO2, facilitated by its strong oxygen vacancy formation and adsorption capability. The ln3+ doping into TiO2 promoted photothermal-catalytic oxidation reaction on the surfaces of In-TiO2, thereby significantly enhancing the desulfurization efficiency of H2S. This study not only offers a deeper understanding of the regulated band structure of TiO2 by doping of Group IIIA metal ions, but also provides a promising and green photocatalytic desulfurizer of In-TiO2 for efficient removal of H2S.
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