Frontiers of Environmental Science & Engineering
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2018
·Vol. 12
·期 1
·1-8
·
IF 1.961
Gao Pan,Song Yuan,Wang Shaoning,Descorme Claude,Yang Shaoxia
The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst, a novel environmental-friendly material, was used to investigate the catalytic wet air oxidation (CWAO) of cationic red GTL under mild operating conditions in a batch reactor. The catalyst was prepared by wet impregnation, and characterized by special surface area (BET measurement), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst exhibited good catalytic activity and stability in the CWAO under atmosphere pressure. The effect of the reaction conditions (catalyst loading, degradation temperature, solution concentration and initial solution pH value) was studied. The result showed that the decolorization efficiency of cationic red GTL was improved with increasing the initial solution pH value and the degradation temperature. The apparent activation energy for the reaction was 79 kJ·mol –1 . Hydroperoxy radicals (HO 2 ·) and superoxide radicals (O 2 – ·) appeared as the main reactive species upon the CWAO of cationic red GTL.
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Nanoscale
·
2018
·Vol. 10
·期 15
·6892-6899
·
IF 7.233
Zhiqiang Cheng,Shengzhe Zhao,Lihao Han
A novel method for synthesizing ZnO/γ-Al2O3 nanofibers by electrospinning and subsequent calcination is reported. The prepared nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The ZnO/γ-Al2O3 nanofibers exhibited excellent capacity for adsorbing organics with a negative zeta potential such as methyl orange (95.8%) and heavy metal ions such as Cr(VI) in aqueous solution. The mechanism of adsorption was investigated, and the adsorption results were fitted using the Langmuir and Freundlich models. Once silver nanoparticles (Ag NPs) were decorated on the surface of the nanofibers by photoreduction, the Ag/ZnO/γ-Al2O3 nanofibers manifested efficient photocatalytic degradation of methyl orange under UV-light illumination. Results confirmed that our Ag/ZnO/γ-Al2O3 nanofibers are a promising adsorbent for the removal of methyl orange and Cr(VI) ions and the adsorbent can be sustainably reused.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jianxin Zhu,Haiyang Liu,Haijun Chen,Xiuyi Hua,Deming Dong,Dapeng Liang,Zhiyong Guo,Na Zheng
Low degradation efficiency and significant transition metal leaching are two challenges in persulfate activation systems based on metal-organic frameworks (MOFs) for organic pollutant degradation. Here, the challenges were solved by designing and synthesizing a micron-sized core-shell material, γ-Al 2 O 3 -C-MIL-100(Fe) (γACM), by coating the γ-Al 2 O 3 core with carbon (γ-Al 2 O 3 -C) and futher modifying with MIL-100(Fe). Testing γACM with sulfamethazine (SMZ) demonstrated its outstanding peroxydisulfate (PDS) activation, achieving 92.5 % SMZ removal within 20 min at a low oxidant/pollutant ratio. Fe leaching from γACM was effectively inhibited, with only 3.59 % Fe lost after three recycles. The system showed adaptability across a wide pH range, and usability in sewage effluent, indicating promise for practical application. The hydrophobicity of γ-Al 2 O 3 -C, the coordinatively unsaturated sites in MIL-100(Fe), and the strong bounding of MIL-100(Fe) on γ-Al 2 O 3 -C ensured the effective SMZ gather, PDS activation, and Fe stability respectively, which led to the excellent performances of γACM.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Rui Cao,Xueqian Wang,Langlang Wang,Fangxian Cao,Xiang Li,Lu Wang,Jinghao Xiang,Ping Ning
The introduction of surface basic sites to COS hydrolysis catalysts can improve H 2 O activation and COS adsorption, leading to enhanced catalytic performance. However, maximizing the concentration of basic sites remains a challenge due to the limited exposed surface area of these catalysts. Herein, a La/Al 2 O 3 catalyst with abundant alkaline sites to catalyze the hydrolysis of COS was prepared by a simple ammonia-assisted hydrothermal method. This synthesized La/Al 2 O 3 catalyst exhibits a thin rod-like structure formed by the random accumulation of nanoparticles. Lanthanum, one of the most abundant rare earth metals, is an ideal doping aid to further promote the COS-catalyzed hydrolysis performance of Al 2 O 3 . Characterization studies show that the proper lanthanum loading effectively enhances the formation of basic sites, leading to improved lattice oxygen reactivity and –OH adsorption capacity. As a result, the prepared La-loaded Al 2 O 3 nanorod sample with abundant basic sites exhibits nearly 100 % COS conversion and total H 2 S yield at 160 °C. In addition, the reaction pathways and deactivation mechanisms for selective catalytic hydrolysis of COS on the La-doped Al 2 O 3 catalyst were revealed by using in situ DRIFTS to evaluate COS adsorption and hydrolysis. Density functional theory calculations showed that La loading enhances the electron transfer between the La and Al atoms, improves the formation of basic sites, and enhances the adsorption of –OH. This study provides new insights into the design of efficient alumina-based catalysts for the catalytic hydrolysis of COS.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zhenkai Wang,Yifan Li,Yanfang Su,Sheng-Peng Sun,Xiaoning Wang,Zhangxiong Wu,Winston Duo Wu,Xiao Dong Chen
Catalytic membrane integrating membrane filtration and advanced oxidation in one single-step is promising in addressing emerging micropollutants issue in water, the challenges in catalytic activity and stability still limit their practical application. This study successfully anchored highly stable Fe–Mn bimetallic catalyst (FMBC) in Al 2 O 3 -based microfiltration and ultrafiltration ceramic membranes channel (named as FMBC@Al 2 O 3 -MF or UF) via a novel in situ fabrication strategy. Characterization results revealed that FMBC was anchored on the membrane channel wall of Al 2 O 3 -MF/UF, which enabled boosting Oxone activation to generate sulfate radical and hydroxyl radical at circumneutral pH (e.g., 7.0–9.0) and with great stability. Notably, FMBC@Al 2 O 3 -UF exhibited a remarkable activity and anti-interference capability in actual water matrices, which resulted in efficient degradation of emerging micropollutants such as carbamazepine, crotamiton, diethyltoluamide, gemfibrozil and ibuprofen in lake water and municipal wastewater treatment plant secondary effluent at environmentally relevant concentrations. Moreover, FMBC@Al 2 O 3 -MF/UF also displayed high cleaning efficiency toward natural organic matter (NOM) and effluent organic matter (EfOM) fouling via Oxone activation. Besides, the intermediates of carbamazepine degradation were identified, and most of them had decreased aquatic toxicity based on Ecological Structure Activity Relationship (ECOSAR) prediction. The high activity, stability and environmentally friendly property of the as-prepared FMBC@Al 2 O 3 -MF/UF make them promising application for advanced treatment of emerging micropollutants in water.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Yunshuo Wu,Haiqiang Wang,Zhongbiao Wu
The development of catalysts with high-density interfacial sites is crucial for enhancing catalytic performance. However, the efficient construction of interfacial sites remains a significant challenge. In this study, we introduced a ligand-regulated co-precipitation synthesis strategy to fabricate a Cu@ZnO1-x/Al2O3 catalyst. The catalyst possesses high-density partially-reduced ZnO1-x-Cu interfacial sites and exhibits enhanced activity for CO2 hydrogenation to methanol. The methanol space-time yield (STY) of the Cu@ZnO1-x/Al2O3 was 3.8 times higher than that of the commercial Cu/ZnO/Al2O3 after 14 h continuous reaction. Molecular dynamics (MD) simulations and in situ Raman spectroscopy indicated that Cu‒X‒Zn linkage ligands formed in the precursor solution during hydrothermal treatment facilitated zinc-malachite formation during co-precipitation, which promoted Cu-ZnO interface formation during H2 reduction. Moreover, density functional theory (DFT) calculations confirmed partially-reduced ZnO1-x-Cu interfaces were more active via the formate pathway. This work reveals a novel and robust route for designing catalysts with high-density interfacial sites, shedding light on catalyst development.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yuhan Ren,Biao Zhang,Zhaoxin Zhong,Jian Ye,Jiawei Zhang,Zhiyong Fang,Feng Ye
In this study, monolithic Al 2 O 3 –SiO 2 aerogels with excellent thermal stability and high specific surface area were synthesized using boehmite nanorods (L=20–30 nm, D=3–5 nm). The high specific surface area of aerogels was maintained after calcination at 800 °C (663.54 m 2 /g), 1000 °C (486.91 m 2 /g), and 1100 °C (230.76 m 2 /g). The anti-sintering mechanism of the Al 2 O 3 -SiO 2 aerogels was discussed. Thanks to the composite of Al 2 O 3 -SiO 2 aerogel and mullite fibers, the disadvantages of brittleness and low strength of aerogel are overcome. The thermal conductivity of the composite is extremely low at 0.034 W/(m·K)-0.089 W/(m·K) (25 °C-1000 °C). Five muffle cycle back-temperature tests at 1000 °C and a butane blowtorch back-temperature test at 1350 °C also proved that the composites have excellent thermal insulation properties. Composites with excellent thermal insulation properties combined with lightweight, thinness, machinability, and good dielectric properties meet the need for high-temperature thermal insulating-wave transmitting integrated materials for hypersonic missile radomes.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zixian Wang,Yajun Li,Kai Yang,Yufan Gu,Mingxuan Gu,Limei Pan,Jian Gu,Jian Yang
In this work, high-continuity nano-Cr 2 O 3 films were fabricated on the Al 2 O 3 ceramic substrate surface via the evaporation-induced self-assembly (EIA) method, aiming at decreasing the secondary electron emission yield (SEEY) and increasing the vacuum withstand voltage performance of Al 2 O 3 ceramic for application in electric vacuum devices. The effects of ethylene glycol monomethyl ether (MOE) addition and calcination temperature on the composition, structure, and various properties of the nano-Cr 2 O 3 films were investigated, and the related mechanisms were discussed. Employing MOE and increasing its addition significantly mitigated internal stress during the liquid film formation and crack-free nano-Cr 2 O 3 films were achieved at 15% addition. With the calcination temperature increasing from 300 °C to 1000 °C, the crystallinity, uniformity, and compactness of the film were improved, while the defect states decreased, resulting in an increase in bandgap, surface resistivity, and decrease in SEEY, presenting the particularity of Cr 2 O 3 . When calcined at above 1000 °C, the Cr 2 O 3 film gradually dissolved into the Al 2 O 3 substrate, which led to the increase in bandgap, surface resistivity and SEEY, approaching the intrinsic characteristics of Al 2 O 3 at 1500 °C. The nano-Cr 2 O 3 film calcined at 1000 °C exhibits optimized comprehensive structure characteristics, moderate surface resistivity (1.30×10 16 Ω/□), the lowest SEEY (2.27), and presenting a much improved and impressive vacuum flashover voltage strength of 65 kV/cm.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yuhan Cui,Songyin Yu,Zhichao Sun,Hongyu Niu,Changhai Liang,Chuang Li
Selective hydrogenation of fatty esters to high-value fatty alcohols is highly desirable for the utilization of natural oils. However, the hydration reaction of the support and hydrolysis reaction of the C–O bond can affect the selectivity of the targeted alcohol. Herein, core–shell Al2O3@Cu2Zn1-LDO is prepared via the in situ growth of CuZnAl-LDHs on Al2O3 microsphere substrates, followed by a calcination–reduction process. The catalyst achieves a methyl laurate (ML) conversion of 95% and selectivity of 98% for lauryl alcohol (LA) under mild conditions (4 MPa of H2 and 240 °C). In addition, the three-dimensional (3D) hierarchical structure of the Al2O3@Cu2Zn1-LDO catalyst enhances mass diffusion and transport, significantly improving catalytic performance and exhibiting excellent stability in the hydrogenation of fatty esters to fatty alcohols. The hydration reaction between Al2O3 and H2O produced during the hydrogenation of fatty acid esters is prevented successfully. Therefore, this work provides a new approach for designing newly structured Cu-based catalysts for the highly selective synthesis of fatty alcohols from natural oils.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhurong Liang,Zhuoneng Bi,Kai Gao,Yifei Fu,Pengyue Guan,Xialei Feng,Zhisheng Chai,Gang Xu,Xueqing Xu
In common perovskite solar cells utilizing TiO 2 as electron transport layer, undesirable charge recombination at TiO 2 /CH 3 NH 3 PbI 3 interface is one of the crucial issues to the photovoltaic performance of the device. Moreover, exposure of TiO 2 under long-term solar illumination may also cause deep trap states at TiO 2 surface and seriously influence the device stability. Herein, we introduce an insulating ultra-thin Al 2 O 3 interfacial layer between the mesoporous TiO 2 film and perovskite layer. The power conversion efficiency of the solar cells fabricated via spray deposition in the air increased from 9.36% ( V oc = 0.86 V, J sc = 17.21 mA cm −2 , FF = 0.63) to 12.79% ( V oc = 0.93 V, J sc = 21.56 mA cm −2 , FF = 0.64). The significantly improved photovoltaic performance is mainly attributed to the efficient reduction of charge recombination. Meanwhile, the Al 2 O 3 -modified perovskite solar cells exhibit a strong stability under long-term light exposure compared with the common device without the Al 2 O 3 interfacial layer.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wenwu Zhou,Li Yang,Lang Liu,Zhiping Chen,Anning Zhou,Yating Zhang,Xinfu He,Faxiang Shi,Zegao Zhao
Highly ordered mesoporous TiO 2 -Al 2 O 3 composites with different TiO 2 mass contents (MA-xTi) were successfully synthesized via an improved solvent evaporation-induced self-assembly method and the corresponding NiMo supported hydrodesulfurization (HDS) catalysts were prepared via wetness incipient co-impregnation method. The materials were characterized by means of XRD, ICP-OES, N 2 physical adsorption-desorption, SEM, TEM, Py-FTIR, H 2 -TPR, HRTEM and XPS and the catalytic activities for 4,6-dimethyldibenzothiophene (4,6-DMDBT) HDS over the prepared NiMo/MA-xTi series catalysts were investigated. The results show that the crystal forms, crystal morphologies, pore structures, pore arrangements and acidity properties of the MA-xTi samples varied with the incorporation and increase of TiO 2 species; the interaction between the active metals and the support materials (MSI) can be modulated by the incorporation of TiO 2 species, and TiO 2 incorporation also can promote the formation of the so-called “Type II” NiMoS active phase via changing the morphology of Ni promoted MoS 2 slabs, promoting the sulfidation of both Ni and Mo species and enhancing the proportion of NiMoS phase. The catalytic evaluation results show that the enhancement in the overall HDS activity of the NiMo/MA-xTi series catalysts were mainly contributed by the enhancement in the hydrogenation desulfurization (HYDS) activity. Catalyst NiMo/MA-20Ti exhibited the superior catalytic performance due to its highly ordered mesopore arrangement, proper acidity, moderate MSI, moderate stacking and high proportion of NiMoS phase which leads to more highly active “Type II” active sites.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
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