APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Rui Zhang,Yihong Guo,Jianguo Yu,Sen Lin
Lithium/aluminum layered double hydroxide imprinted with SO 4 2- (ILDH) was prepared to enhance the lithium adsorption performance in low grade sulfate-type brines. The systematical characterization confirmed the ILDH had a morphology of two-dimensional lamella that was less randomly arranged than the traditional lithium/aluminum layered double hydroxide (TLDH). ILDH demonstrated a significantly enhanced adsorption performance in the long-term adsorption–desorption cycle replying on the excellent structural stability from the imprinting effects compared to TLDH. The adsorption capacity of ILDH was about 3.0 mg/g after 10 cycles, and the column experiments manifested that the Mg 2+ /Li + mass ratio could be significantly declined from 57.99 in the Yiliping sulfate-type brine to 2.36 in the desorption solution with 2.77 mg/g Li + adsorption capacity at room temperature .
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·513-526
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IF 4.186
Bingheng Sun,Benxue Jiang,Jintai Fan,Le Zhang,Long Zhang
Red-emitting color-convertors have attracted considerable attention for promising applications in solid-state lighting (SSL) to improve color rendition. However, the current nitride and fluoride phosphor powders have encountered several challenges, such as high cost, narrow emission bands, and insufficient stability during operation, which limit the development of high-power full-spectrum SSL. In this study, thermally robust Gd 3 (Al,Ga) 5 O 12 :Mn (GAGG:Mn) solid-solution ceramics (SSCs) with dual wavelength red-emission bands were prepared via an oxygen solid-state sintering reaction. The doped Mn ions occupied octahedral Al 3+ and Ga 3+ sites to generate Mn 4+ luminescent centers with pronounced deep-red emissions peaking at 698 nm ( 2 E → 4 A 2 ), and Mn 2+ luminescent centers with broad red emissions at 628 nm ( 4 T 1 → 6 A 1 ). Because the cationic radius matching effect induced the regulation of valence state of Mn, the photoluminescence of the GAGG:Mn SSCs can be tailored by the substitution of Al 3+ with Ga 3+ . Moreover, the Mn 3+ also existed in the GAGG lattice host, and their concentration decreased with increasing Ga 3+ contents owing to the mismatch of ionic radius between Mn 3+ and Ga 3+ ions. With the optimization of Al/Ga ratio and concentration of Mn ions, a broad emission band ranging from 550 to 800 nm (bandwidth = 250 nm) was achieved from Gd 3 Al 3 Ga 2 O 12 :0.3%Mn SSCs upon 465-nm excitation. Moreover, the GAGG:Mn SSC has over 17-fold enhanced thermal conductivity compared with the corresponding phosphor powder. This paper opens a door of regulating the valence state of luminescence centers with cation substitution and the application of oxide red-emitting color-convertors.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Yingshu Liu,Haiyang Tao,Xiong Yang,Xiaoyong Wu,Jinjuan Li,Chuanzhao Zhang,Ralph T. Yang,Ziyi Li
Adsorption is a promising technology for capturing nitrogen oxides (NO x ) from humid flue gases , for which as the preferred NO x adsorbent, zeolite with an appropriate silica to alumina (Si/Al) ratio provides the key step for success in practical applications. In this work, the effects of Si/Al ratio, temperature, relative humidity (RH), and feed gas (NO x -H 2 O(g)–CO 2 –O 2 -N 2 ) compositions on NO x sorption behavior on HZSM-5 zeolites were systematically investigated, based on a series of characterizations, fixed-bed adsorption and temperature programmed desorption (TPD) tests. The low-silica HZSM-5(25) showed the best performance (326.6 μmol/g and 39.2 μmol/g at dry and 90%RH) as compared to others with higher Si/Al ratios at each RH, in which the roll-up effect was positively correlated with the Si/Al ratios and humidity. O 2 enhanced NO x adsorption and reached an optimal adsorption capacity at the concentration of 14%, while CO 2 had little effect on NO x adsorption. The decrease in temperature increased NO x adsorption capacity on HZSM-5(25), benefitting from NO 2 physisorption as well as satisfactory NO oxidation within the active adsorbent structure. The facile thermal desorption of NO x and significant NO–NO 2 conversion on HZSM-5(25) was exhibited by bimodal TPD peaks at 343–353K and 533–543K respective for NO and NO 2 , in contrast to those on Silicalite-1. A potential “water-resistant” strategy via the enhancement of NO x adsorption competitiveness was revealed, providing a theoretical guideline for NO x adsorbent screening in industrial applications.
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Advanced Electronic Materials
·
2022
·Vol. 8
·期 11
·2200577
·
IF 7.633
Nan Xin,Guihua Tang,Yifei Li,Hao Shen,Yinan Nie,Min Zhang,Xin Zhao
Single crystal tin selenide (SnSe) has a recorded high thermoelectric figure of merit (ZT) value of 2.6 at 923 K, but it is easy to form mechanical cracks and difficult to apply in thermoelectric conversion devices. Polycrystalline SnSe has better mechanical properties but inferior ZT values, which needs further optimization for applications. This work aims at enhancing the thermoelectric performance of polycrystalline SnSe through synergistic optimization of sliver (Ag) and aluminum (Al) co-doping with the hydrogen reduction. The effects of Ag and Al doping on electronic transport properties are systematically investigated by density functional theory calculation and experimental measurement. Compared with pristine SnSe, Ag doping can effectively increase the hole concentration to 1.58 × 10 19 cm −3 and improve the conductivity. Results also indicate that using Al dopant may slightly decrease the hole concentration but reduce the thermal excitation temperature, and introduce point defects reducing the lattice thermal conductivity through scattering phonons. In addition, the hydrogen reduction of sample powders before synthesis can effectively remove Sn oxides and reduce lattice thermal conductivity. At last, a state-of-the-art maximum ZT value of 1.69 at 823 K is obtained in Ag 0.01 Al 0.01 Sn 0.98 Se. This study provides a theoretical basis and technical guidance for designing high-performance polycrystalline SnSe.
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Defence Technology
·
2022
·
IF 4.035
Xiaogang Guo,Taotao Liang,Junfeng Guo,Huisheng Huang,Shuying Kong,Jianwei Shi,Binfang Yuan,Qi Sun
For solving the dilemma of the short exothermic life-span of WO 3 based metastable interstitial composites (MICs) with extensive application prospect, this paper has firstly designed the promising anti-wetting Al/WO 3 MICs via electrophoresis assembly of nano-Al and WO 3 particles fabricated by hydrothermal synthesis method, followed by the subsequent fluorination treatment. A combination of X ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR) techniques were utilized in order to characterize the crystal structure, microstructure, and elemental composition distribution of target films after different natural exposure tests. The product with uniform distribution and high purity possesses a high contact angle of ∼170° and a minute sliding angle of ∼1°, and displays the outstanding anti-wetting property using droplets with different surface tensions. It also shows great moisture stability in high relative-humidity circumstances after one year of the natural exposure experiment. Notably, the heat output of a fresh sample can reach up to 2.3 kJ/g and retain 96% after the whole exposure test, showing outstanding thermo-stability for at least one year. This work further proposed the mechanism of anti-wetting Al/WO 3 MICs considering the variation tendency of their DSC curve, providing a valuable theoretical reference for designing other self-protected MICs with a long exothermic life-span applied in wide fields of national defense, military industry, etc.
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CHEMOSPHERE
·
2022
·
IF 8.943
Yuqi Zhou,Hanqing Lv,Jin Lin,Tianyu Lv,Nan Wang,Heqing Tang,Lihua Zhu
This work reports a mechanochemical (MC) method for complete defluorination of perfluorooctanoic acid (PFOA) by using Al and Al 2 O 3 as milling agents. Both the Al/Al 2 O 3 molar ratio ( n Al / n Al 2 O 3 ) and the pre-thermal treatment of Al 2 O 3 strongly influenced the defluorination of PFOA. When commercial γ -Al 2 O 3 was pre-treated at 1200 °C, the use of Al and heat-treated γ -Al 2 O 3 with n Al / n Al 2 O 3 of 1: 1 led to PFOA defluorination of 100% after ball milling for 26 min at 350 rpm, being much higher than those (8.3%–58.1%) for using singlet milling agents or binary milling agents containing γ -Al 2 O 3 pre-heated at temperatures lower than 700 °C. It was clarified that the carboxylate-mediated adsorption of PFOA on Al 2 O 3 was essential for the MC decarboxylation as a degradation initiation step, and the in-situ generated electron on milled Al consequently caused the reductive dissociation of C–F bonds in the decarboxylation intermediate. A larger n Al / n Al 2 O 3 increased the in-situ electron generation rate ( r e ), and a higher heat-treatment temperature decreased OH − /H 2 O adsorbed on Al 2 O 3 to low the PFOA decarboxylation rate ( r dec ). The r e / r dec ratio determined defluorination pathways, and the percentage of the defluorination of PFOA in its total degradation including the generation of any degradation intermediates increased linearly with increasing r e / r dec .
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PubMed
高影响因子
Particuology
·
2022
·
IF 3.251
Lichen Zhang,Shuo Wang,Xing Su,Xiaodong Li,Meishuai Zou
The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition temperature. In this study, the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method, and 3-Perfluorohexyl-1, 2-epoxypropane (PFHP) (F 3 C(CF 2 ) 5 CH 2 C 2 H 3 O) was coated to form a uniform and controllable core-shell Al@PFHP. The core-shell Al@PFHP showed better thermal reaction and ignition performance. The exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times, with lower ignition temperature (reduced by about 140 °C) and longer burning duration (increased by about 1.5 times) after coating with PFHP, compared with raw aluminum powder. In addition, the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junjie Lu,Dong Wang,Keqiang Zhang,Suwen Li,Bin Zhang,Xueqin Zhang,Lu Zhang,Wenqing Wang,Ying Li,Rujie He
To obtain both plasticity and toughness of the material at the same time, various manufacturing techniques of ceramic-metal composites and structures have been studied. In this work, a bio-inspired Al 2 O 3 ceramic scaffold with Gyroid structure was designed and prepared by stereolithographic (SL) additive manufacturing , then the Al 2 O 3 /Al ceramic-metal hybrid structure was prepared by infiltrating molten Al into the Al 2 O 3 ceramic structure. The performances of the Al 2 O 3 ceramic scaffold and the Al 2 O 3 /Al ceramic-metal hybrid structure were compared and analyzed by a quasi-static compression experiment. The quasi-static compressive strength of the pristine Al 2 O 3 scaffold was 14.36 MPa, while that of the Al 2 O 3 /Al ceramic-metal hybrid structure was up to 89.06 MPa. Moreover, the plasticity of the Al 2 O 3 /Al ceramic-metal hybrid structure was much higher than that of the Al 2 O 3 scaffold. During compression, the Al 2 O 3 /Al ceramic-metal hybrid structure had excellent energy absorption, reaching up to 2569.16 KJ/m³, 15 times that of the Al 2 O 3 scaffold. Therefore, this method can obtain materials with excellent ductility and toughness.
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APPLIED ENERGY
·
2022
·
IF 11.446
Xianyao Yan,Yingjie Li,Chaoying Sun,Chunxiao Zhang,Liguo Yang,Xiaoxu Fan,Leizhe Chu
The sorption-enhanced steam gasification of biomass (SESGB) using CaO-based materials is considered as a promising method for H 2 production. Ca-Al-Ce material has been reported as a good bi-functional material in SESGB process. Red mud is a solid waste in aluminium industry with large yield, which is rich in Fe 2 O 3 . In this work, a red mud-doped Ca-Al-Ce bi-functional material was prepared by wet-mechanical mixing method for H 2 production from SESGB. The CO 2 capture, H 2 production, and tar reduction performances during SESGB process using the red mud-doped Ca-Al-Ce bi-functional material were studied. The results show that the optimum addition amount of red mud in the bi-functional material is 5 wt%. After 20 SESGB cycles, the H 2 concentration using the red mud-doped Ca-Al-Ce material achieves 65.1 vol%, which is 82.4% higher than that using Ca-Al-Ce material. Besides, with the addition of red mud in the bi-functional material, the tar, residue char yields and CO 2 concentration decrease by 25.2%, 8.6% and 52.2%, respectively. Fe 2 O 3 in the red mud reacts with CaO to form Ca 2 Fe 2 O 5 in the 1st cycle, and Ca 2 Fe 2 O 5 is stable during 20 cycles, which is beneficial for the generation of oxygen vacancy. The oxidation states of Fe species in the material increase with the number of SESGB cycles, thus the catalytic effects on water gas shift reaction and tar reduction are promoted. The red mud addition is the key factor that results in high H 2 production, CO 2 capture and tar reduction performances, so the red mud-doped Ca-Al-Ce material appears promising for SESGB.
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高影响因子
FUEL
·
2022
·
IF 8.035
Min Zhong,Pengju Yang,Bo Hou,Ming Xia,Jungang Wang
The main requirement for Co-based catalysts in Fischer-Tropsch synthesis (FTS) is to efficiently convert syngas (H 2 +CO) into long-chain hydrocarbons (C 5+ ). Since the formation of long-chain hydrocarbons (C 5+ ) is thermodynamically favored at low temperatures, it is desirable to develop efficient catalytic systems that can allow working at a relatively low reaction temperature. Herein, the Al 2 O 3 /Al composite has been used as support for the Co-based catalysts. The catalytic performance of Co/Al 2 O 3 /Al catalysts in FTS can be regulated by varying the Al 2 O 3 -layer thickness. With the thickening of Al 2 O 3 -layer, the catalytic activity and selectivity toward C 5+ hydrocarbons over Co/Al 2 O 3 /Al decrease markedly, although the number of accessible Co 0 sites increases obviously. This Al 2 O 3 -thickness-dependent FTS performance can be attributed to a variation of the proportion of active species Co-AlO x -Al and less active species Co-Al 2 O 3 . On the basis of the above finding, a highly active catalyst (Co/Al-0) has been developed using commercial Al metal powers as support, which will enable the FTS process to work at a fairly low reaction temperature (below 185 °C) and maintain excellent catalytic activity. This study provides a practical but low-cost method to modulate the electronic properties of metal catalysts by using available metal powders.
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FUEL
·
2023
·
IF 7.4
Jie-Yao Lyu,Geng Xu,Haorui Zhang,Wenming Yang,Qi-Long Yan
Conventional solid propellants suffer from undesirable combustion performance due to the poor mass and heat transfer between metal fuels and oxidizers, as well as a lack of catalytic active sites between the catalyst and catalyzed objects. Embedding metal fuels and catalysts within the oxidizer has shown promise in improving the overall combustion performance of HTPB/AP/Al and HTPB/AP/RDX/Al composite solid propellants. However, the underlying mechanisms responsible for this enhancement remain to be further understood. In this study, we investigated the reactivities of core–shell Al@AP and Al@AP/CuO composites using thermal analysis and combustion diagnostic techniques. The results demonstrated that the decomposition of AP was promoted, as evidenced by a lower peak temperature (415.2–334.7 ℃), higher total heat release (116.4–720.8 J·g −1 ), a transition in the decomposition physical model from the random nucleation and 2D/3D growth of nuclei model to the auto-catalytic model, and increased generation of NO 2 . Furthermore, the Al@AP/CuO propellant pellet exhibited a more stable flame without agglomeration, and the condensed combustion products (CCPs) contained a lower amount of unreacted Al compared to that of conventional mixtures. These findings highlighted the potential of core–shell Al@AP and Al@AP/CuO composites as replacements for discrete ingredients of solid propellants, thereby offering improved performance for next-generation propulsion systems.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 9
·3741-3752
·
IF 1.6
Yusheng Wang,Ying Dai,Wenmei Hu,Jinhua Xie,Qinqin Tao
Two Mg–Al layered bimetallic (hydrogen) oxides with uranium selective deposited space were obtained by intercalating bimetallic (hydrogen) oxides with L-serine with active amino and carboxyl sites, which showed excellent uranyl selectivity from cation mixture solutions of Ni 2+ , Co 2+ , Sr 2+ , Zn 2+ , La 3+ , Gd 3+ , Ce 3+ , and Sn 4+ . It was firstly proved in L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides. The key parameter, maximum uranium uptake amount, reached 1028.37 mg/g for LS-LDH and 1018.50 mg/g for MgAl-LDO/C at pH 4.5. These merits coupling with very high uptake capacity, highly cost effectivity, facile preparation and acceptable recycle performance makes LS-LDH and MgAl-LDO/C promising in the treatment of uranium-containing solutions. The study enables the understanding of selectively treating uranium-containing wastewater with L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides.
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