In order to prepare convenient recycled photocatalysts and improve their photocatalytic degradation efficiency, TiO2/c/BiOBr graphene aerogel (TcBA) with excellent photocatalytic activity and recyclability is successf...
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In order to prepare convenient recycled photocatalysts and improve their photocatalytic degradation efficiency, TiO2/c/BiOBr graphene aerogel (TcBA) with excellent photocatalytic activity and recyclability is successfully prepared by a combination of electrostatic spinning with solvothermal method. The introduction of graphene aerogel not only increases the specific surface area to obtain more active sites, but also enhances the conductivity of the material and accelerates electron transfer. Under simulated sunlight irradiation, the optimal ratio of TcBA composites (2TcBA-II) has a high degradation rate for cationic dyes, anionic dyes, and antibiotics by the syn-ergistic effect of physisorption and photocatalysis. Radical trapping experiments indicate *** plays a major role in the photocatalytic degradation of organic pollutants, and we propose an indirect Z-scheme heterojunction photocatalytic system. In addition, the 2TcBA-II composite is applied to modify the lithium-sulfur (Li-S) battery separator, and the maximum discharge specificcapacities are 1271 and 854 mAh g-1 at current densities of 0.2 c and 0.5 c, respectively. After 300 cycles, the discharge specificcapacity can be maintained at 530 and 357 mAh g1 formance. It indicates that the conveniently recycled three-dimensional (3D) composite 2TcBA-II can better adsorb polysulfides, and provides multi-dimensional electron transport pathways with accelerated electro-chemical reaction rates, thus enhancing the bidirectional conversion reaction of sulfur. Thus, the TcBA com-posites have important application prospects in both photocatalysis and Li-S batteries.
ZrB2-Zrc-Sic-Mo-c/c (ZZS-Mo-c/c) composites with dense composite ceramiccoating and excellent interfacial bonding are synthesised using reaction spark plasma sintering (RSPS). Furthermore, the densification process, ...
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ZrB2-Zrc-Sic-Mo-c/c (ZZS-Mo-c/c) composites with dense composite ceramiccoating and excellent interfacial bonding are synthesised using reaction spark plasma sintering (RSPS). Furthermore, the densification process, interfacial bonding, ablative properties and underlying mechanism of ZZS-Mo-c/ccomposites are investigated. Before and after ablation, the composite exhibits excellent interfacial bonding, indicating that the presence of Mo-foil transition layer enables an optimal connection between ZZS and c/c. Additionally, SEM analysis reveals that the ZZS ceramics have a dense structure, thereby preventing oxygen from diffusing further into the matrix. And the ablation results indicate that ZZS-Mo-c/c exhibits superior oxidation resistance when exposed to an oxygen-acetylene flame.
In order to form the strong mechanical interlocking and improve the compatibility between interlayer and c/ccomposite, a porous structure with a series of annular gaps and cu coating on c/ccomposite surface were des...
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In order to form the strong mechanical interlocking and improve the compatibility between interlayer and c/ccomposite, a porous structure with a series of annular gaps and cu coating on c/ccomposite surface were designed and prepared by micro oxidation in the muffle furnace and magnetron sputtering, respectively. The c/ccomposite |Ti3Al joints were prepared by transient liquid phase (TLP) diffusion bonding. During the bonding process, the liquid phase flowed into the gaps, and the infiltration layer is formed between c/ccomposite and core interlayer. The infiltration layer mainly consists of c/c matrix, Tic and Ag (s, s), and the cTE of infiltration layer between that of c/ccomposite and interlayer. Therefore, the mismatch of thermal deformation between c/ ccomposite and interlayer can be reduced, which can avoid high stress in the joint. After surface modification of c/ccomposite with micro-oxidation at 630 degrees c for 30min and cu film, the wettability of liquid phase on c/ccomposite increased, and Ti-cu phase formed in the core interlayer of the corresponded joints, which consumes the Ti atoms in liquid phase and causes a thin Tic layer. The shear strength of the joints increases from 34.58 MPa (the original joints) to 44.23 MPa (the pretreated c/c|Ti3Al joints) under optimized process (i.e. 880 degrees c, 10min), and the fracture not occurs in c/ccomposite but in joint area after pretreatment of c/ccomposite.
Doping is an effect strategy to improve the visible-light-driven photocatalytic activities of g-c3N4. Herein, c, Ocodoped nano-structured g-c3N4 was facilely synthesized in one pot by introducing ordinary ethanol into...
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Doping is an effect strategy to improve the visible-light-driven photocatalytic activities of g-c3N4. Herein, c, Ocodoped nano-structured g-c3N4 was facilely synthesized in one pot by introducing ordinary ethanol into the polymerization process of melamine. It exhibited favorable visible-light-driven photocatalytic hydrogen production activity 4.29 times higher than that of bulk g-c3N4 synthesized from pure melamine. The enhanced photocatalytic activities benefit from the improvements in both optical absorption and photo-induced exciton separation, which is induced by the midgap states caused by c, O-doping. The proposed method has also been demonstrated versatile to improve g-c3N4 samples derived from other c/N precursors (dicyandiamide and cyanamide).
Biochar application is a potent climate change mitigation strategy in agroecosystems. However, little is known about the interactive effects of elevated cO2 (ecO2) and biochar on plant nutrient uptake and soil microbi...
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Biochar application is a potent climate change mitigation strategy in agroecosystems. However, little is known about the interactive effects of elevated cO2 (ecO2) and biochar on plant nutrient uptake and soil microbial processes. A pot experiment was conducted to investigate the effects of ecO2 and biochar addition on plant c:N:P stoichiometry and rhizobacterial community for better management of nutrient balance and use efficiency in a future climate scenario. White lupin (Lupinus albus L.) was grown for 30 days in topsoil and subsoil with or without 2% corn-stubble biochar under ambient cO2 (acO2: 390 ppm) or ecO2 (550 ppm). Elevated cO2 increased, but biochar decreased, plant biomass and shoot N and P uptake, with no interactions in either soil layer. Elevated cO2 decreased shoot N concentration by 16% and biochar decreased shoot P concentration by 11%. As a result, ecO2 increased shoot c:N ratio by 20% and decreased the N:P ratio by 11%. Biochar decreased shoot c:N ratio by 8% in the subsoil under ecO2. However, biochar increased shoot c:P ratio by an average of 13% and N:P ratio by 23% in the subsoil. Moreover, plants grown in the subsoil showed lower shoot N (35%) and P (70%) uptake compared to the topsoil. The results indicate that N and P are the more limiting factors that regulate plant growth under ecO2 and biochar application, respectively. Elevated cO2 and biochar oppositely affected dominant rhizobacterial community composition, with the ecO2 effect being greater. The microbiota in the subsoil held a greater diversity of contrasting species than the topsoil, which were associated with nutrient cycling, hydrocarbon degradation and plant productivity. These results enrich our understanding of potential soil nutrient cycling and plant nutrient balance in future agroecosystems.
In this study, a lightweight and robust Ti 3 c 2 T x /carbon nanotubes (cNTs) foam (TcF) was fabricated using Hcl-induced self-assembly, followed by vacuum freeze-drying. The electrical conductivity and mechanical ela...
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In this study, a lightweight and robust Ti 3 c 2 T x /carbon nanotubes (cNTs) foam (TcF) was fabricated using Hcl-induced self-assembly, followed by vacuum freeze-drying. The electrical conductivity and mechanical elasticity of the TcF was higher than those of monolithic Ti 3 c 2 T x foams. This was ascribed to the incorporation of cNTs into Ti 3 c 2 T x preventing the stacking of the Ti 3 c 2 T x nanosheets and producing a well-developed three-dimensional honeycomb-like porous network structure, which considerably improved impedance matching, promoted multiple reflection loss, increased conduction loss and polarisation loss, thus imparting remarkable microwave absorption properties to the TcF. The 1.72 and 1.92 mm thick TcF samples with absorber loadings of 4 wt%, which were obtained by immersing TcF into molten paraffin, followed by cutting it into coaxial rings, presented an optimum reflection loss of −48.8 dB and a maximum effective absorption bandwidth (EAB) of 5.44 GHz, respectively. Moreover, upon increasing the thickness of the TcF samples from 1.52 to 4.92 mm, the EAB could be regulated from 4.16 to 18 GHz, respectively. In this study, we developed a facile method for fabricating a lightweight and robust TcF, which met the ‘light, thin, broad, and strong’ criteria and presented a broad EAB and remarkable dissipation capability, for microwave absorption materials.
Some studies have assessed the expression of dopaminergic dopamine 2 (D2)/3 receptors in prolactinomas and nonfunctioning pituitary adenomas (NFPA) by positron emission tomography/computed tomography (PET/cT) with
Some studies have assessed the expression of dopaminergic dopamine 2 (D2)/3 receptors in prolactinomas and nonfunctioning pituitary adenomas (NFPA) by positron emission tomography/computed tomography (PET/cT) with
Abnormal beta-amyloid plaques and tau protein accumulation are the core pathologic features of Alzheimer's disease. However, the accumulation of these proteins is also common in cognitively normal elderly people. ...
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Abnormal beta-amyloid plaques and tau protein accumulation are the core pathologic features of Alzheimer's disease. However, the accumulation of these proteins is also common in cognitively normal elderly people. Therefore, this study is aimed to evaluate the amyloid and tau accumulation in the cognitively normal population. A preliminary prospective study was conducted on 24 cognitively normal individuals who underwent Pittsburgh compound B (
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