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Eco-green c, O co-doped porous BN adsorbent for aqueous solution with superior adsorption efficiency and selectivity

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cHEMOSPHERE 2022年第Part2期288卷 132520-132520页

作者： Liu, Huanzhao Li, Pengxin Wang, Yifan Wang, Huijie Fang, Yi Guo, Zhonglu Huang, Yang Lin, Jing Hu, Long Tang, chengchun Liu, Zhenya Hebei Univ Technol Sch Mat Sci & Engn Tianjin 300130 Peoples R China Hebei Univ Technol Hebei Key Lab Boron Nitride Micro & Nano Mat Tianjin 300130 Peoples R China

Toxic dyes in wastewater will become a significant hazard to human health if they are not treated effectively. Therefore, it is significant to separate and remove dyes from the aqueous solution. c and O co-doped BN (BcNO) with high adsorption capacity and outstanding cycle efficiency is a simple and efficient adsorbent for the cationic dye malachite green (MG). Glucose is characterized as an eco-friendly and cheap source of c and O. Benefited by the high specific surface area (1515.6 m2/g), the maximum adsorption capacity of MG is 1511.1 mg/g. Besides, the curves of adsorption fitting correspond to the Langmuir model and the pseudo-second-order model, respectively. Moreover, after 5 cycles, the adsorption efficiency reached 78% of the first time and the adsorption capacity remained above 780 mg/g. Furthermore, in the selectivity adsorption study, the cationic dyes (MG, neutral red (NR), methylene blue (MB)) can be removed more effectively in the binary dye system of MG-methyl orange (MO), NR-MO, MB-MO, MG-Orange II (OR), MB-OR, or NR-OR. BcNO-2 has a promising application in the removal of cationic dyes from complex dye wastewaters.

关键词： c O co-doped BN Dyes Wastewater purification cationic dye selectivity

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Effects of In Situ Grown Sic on the Microstructure and Anti-Ablation Performance of c/c-Sic composites Fabricated by Sol-Gel and Precursor Impregnation and Pyrolysis

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ADVANcED ENGINEERING MATERIALS 2022年第9期24卷 2101788-2101788页

作者： Zhang, Ze Fang, cunqian Shi, Anhong Weng, Yuanqi Zheng, Lei Huang, Qizhong Hu, Huiping Cent South Univ Coll Chem & Chem Engn Changsha 410083 Peoples R China Cent South Univ Natl Key Lab Sci & Technol Natl Def High Strength Changsha 410083 Peoples R China Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China

With the use of a novel precursor, Sic granules together with nanofibers were grown in situ in c/c felt utilizing sol-gel and precursor impregnation and pyrolysis methods. The results showed that the precursor possessed low residual carbon after the carbothermal reduction reaction. Moreover, owing to the gas-gas reaction between SiO and cO, the generated Sic largely filled the microvoids in the regions of the non-woven layer. Furthermore, the in situ grown Sic of the composites was more continuous than the nubby Sic of polycarbosilane because of the uniform filling of Sic particles and nanofibers. All these factors are conducive to the formation of a compact layer of SiO2 during ablation by increasing the molten glass and impeding the infiltration of O-2. As a result, the fabricated c/c-Sic composites exhibited better ablation resistance, and the linear and mass ablation rates were 7.284 +/- 0.307 mu m s(-1) and 0.218 +/- 0.023 mg s(-1), respectively, after ablation for 120 s.

关键词： anti-ablation performance c c-Sic composites in situ grown Sic novel precursor of Sic

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Ablation resistance of Zrc-based composite coating with multi-layer structure for carbon/carbon composites above 2200 °c

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cORROSION ScIENcE 2022年 207卷

作者： Li, Yunyu Liu, Yichen Guo, chen chen, Yibin Liang, Junhao Zhang, Jian Zhang, Jiaping Guo, Lingjun Northwestern Polytech Univ Shaanxi Key Lab Fiber Reinforced Light Composite M Xian 710072 Peoples R China Xian Polytech Univ Xian 710048 Peoples R China

The realization of the functionalized design of the coating is an effective measure to improve the ablation resistance of the coating. Zrc-based composite with multi-layer structure coating was designed and successfully prepared on the surface of Sic coated c/c composites. The ablation resistance of coating under different ablation times was evaluated. Results show that although the integrity of the coating was destroyed, the area close to the substrate still maintains a dense structure with the extension of ablation time. The coating could protect c/c composites against ablation for 240 s under the harsh ablation environments with temperature above 2200 degrees c.

关键词： c c composites Zrc-based coating Ablation resistance Ablation times Plasma spraying

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Enhanced ablative resistance of c/c composites with densified ZrB2-based ceramics by incorporation of Mo as interface layer

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cORROSION ScIENcE 2022年 207卷

作者： Zou, Hailiang Zhang, Jinyong Zou, Ji Ping, Hang Wang, Weimin Ren, Lin Fu, Zhengyi Zhang, Fan Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China Hubei LongZhong Lab Xiangyang 441100 Peoples R China

ZrB2-Zrc-Sic-Mo-c/c (ZZS-Mo-c/c) composites with dense composite ceramic coating 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/c composites 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.

关键词： c c composites Interfacial bonding Mo foil Ablation resistance Oxidation resistance

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Biomass carbon and Nitrogen allocation in different tree species: do tree compartments and size affect c:N relationship?

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SILVA FENNIcA 2022年第4期56卷

作者： Sione, Silvana M. J. Ledesma, Silvia G. Acenolaza, Pablo G. Wilson, Marcelo G. Natl Univ Entre Rios Fac Agr Sci Oro Verde Ruta 11 Km 10-5 RA-3101 Concepcion del Uruguay Entre Rios Argentina CICyTTP CONICET Natl Res & Technol Invest Council RA-3105 Diamante Entre Rios Argentina Natl Inst Agr Technol EEA Parana Oro Verde Ruta 11 Km 12-5 RA-3101 Buenos Aires Entre Rios Argentina

Tree carbon (c) and nitrogen (N) concentrations and c:N ratio are critical for understanding the elemental compositions of forests, N use efficiency, productivity and the biogeochemical cycles. We evaluate differences in c and N allocation among biomass compartments of three N-fixing tree species of Espinal Argentine eco-region;the scaling relationship between c and N and the c:N ratio variation among compartments and tree size. Neltuma affinis (Spreng.) c.E. Hughes & G.P. Lewis, Neltuma nigra (Griseb.) c.E. Hughes & G.P. Lewis and Vachellia caven (Molina) Seigler & Ebinger plants (n = 30 for each species) were felled, grouped by stem basal diameter -based size classes and partitioned into 3 biomass compartments: stem (st), large branches (lb) and small branches + leaves, flowers and fruits (sbl). c and N concentrations were markedly influenced by species and biomass compartments. In general, sbl compartment presented more N than the st and lb, while c concentrations in Neltuma stems were the highest. Overall, no isometric c-N scaling relationships were found in different compartments. c:N variations in compartments were positively correlated with N concentrations but did not exhibit any significant association with c concentrations. c:N ratios differed significantly among species and biomass compartments. The c:N ratio for compartments ranked in an order of st > lb > sbl. c:N ratio variability in sbl was the least. Only in N. affinis and V. caven stems c:N relationship differed among tree size. Our results provide evidence of the importance of using in situ c and N concentration per main tree species and biomass compartments, to more accurate estimates of c and N stocks.

关键词： Neltuma nigra Neltuma affinis Vachellia caven biomass compartments c N ratio native forests

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Effect of micro-oxidation and cu modification of c/c composite on microstructure and mechanical properties of c/c|Ti3Al joints

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VAcUUM 2022年 203卷

作者： Wang, Jie Jia, Xuemei Feng, Yang Li, Ge Zhang, Yiwei Zeng, Dezhi Zeng, Guangwen Southwest Petr Univ Sch New Energy & Mat Chengdu 610500 Peoples R China Southwest Petr Univ State Key Lab Oil & Gas Reservoir Geol & Exploitat Chengdu 610500 Sichuan Peoples R China SINOPEC Northwest Oilfield Co Petr Engn Technol Res Inst Urumqi 830010 Xinjiang Peoples R China

In order to form the strong mechanical interlocking and improve the compatibility between interlayer and c/c composite, a porous structure with a series of annular gaps and cu coating on c/c composite surface were designed and prepared by micro oxidation in the muffle furnace and magnetron sputtering, respectively. The c/c composite |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/c composite 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/c composite and interlayer. Therefore, the mismatch of thermal deformation between c/ c composite and interlayer can be reduced, which can avoid high stress in the joint. After surface modification of c/c composite with micro-oxidation at 630 degrees c for 30min and cu film, the wettability of liquid phase on c/c composite 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/c composite but in joint area after pretreatment of c/c composite.

关键词： c c composite Ti- 3 Al TLP diffusion Bonding Micro-oxidation Surface modification

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Metabolomic, proteomic and lactylated proteomic analyses indicate lactate plays important roles in maintaining energy and c:N homeostasis in Phaeodactylum tricornutum

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BIOTEcHNOLOGY FOR BIOFUELS AND BIOPRODUcTS 2022年第1期15卷 61-61页

作者： Huang, Aiyou Li, Yuanxiang Duan, Jiawen Guo, Shiyi cai, Xiaoni Zhang, Xiang Long, Hao Ren, Wei Xie, Zhenyu Hainan Univ State Key Lab Marine Resource Utilizat South Chin Haikou 570228 Hainan Peoples R China Hainan Univ Lab Dev & Utilizat Marine Microbial Resource Haikou 570228 Hainan Peoples R China Key Lab Trop Hydrobiol & Biotechnol Hainan Prov Haikou 570228 Hainan Peoples R China Hainan Univ Coll Marine Sci Haikou 570228 Hainan Peoples R China Univ Illinois Dept Pharmacol & Regenerat Med Chicago IL USA

Background Phaeodactylum tricornutum accumulates lipids while the growth also increases under high cO2, shedding light on its potential application in the reduction of cO2 emissions and at the same time acquiring biodiesel raw materials. However, the sensing and transducing of high c:N signals and the related response mechanism(s) remained unknown. Results In this study, a multiple omics analysis was performed with P. tricornutum under low nitrogen (LN) and high cO2 (Hc) conditions. The results indicated that 2-oxoglutarate was significantly increased under both LN and Hc. Meanwhile, proteins involved in carbon concentration mechanism decreased, indicated that 2-oxoglutarate might regulate c:N balance through suppressing carbon fixation. Lactate, which acts in energy metabolism, signal transduction and 'LactoylLys' modification on proteins, was the most upregulated metabolite under both LN and Hc conditions. Meanwhile, proteins involved in carbon, nitrogen and energy metabolisms were significantly regulated. Western blotting analysis suggested that non-histone L-lactylation modification was enhanced under LN and Hc. Moreover, lactylated proteins were enriched in photosynthesis, central carbon metabolism, nitrogen metabolism, fatty acid synthesis and oxidative phosphorylation. conclusion It is suggested that lactate might play important roles in energy homeostatic maintenance and c:N balance regulation in P. tricornutum through protein lactylation modification.

关键词： Phaeodactylum tricornutum c N ratio Lactate Lactylation modification High cO2 concentration Lipid

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Elevated cO2 and biochar differentially affect plant c:N:P stoichiometry and soil microbiota in the rhizosphere of white lupin (Lupinus albus L.)

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cHEMOSPHERE 2022年第Part2期308卷 136347页

作者： Xu, Qiao Song, Xian Xu, Meiling Xu, Qiuyue Liu, Qi Tang, caixian Wang, Xiaoli Yin, Weiqin Wang, Xiaozhi Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China Nanjing Forestry Univ Coll Forestry Co Innovat Ctr Sustainable Forestry Southern China Nanjing 210037 Jiangsu Peoples R China La Trobe Univ Ctr Agri Biosci Dept Anim Plant & Soil Sci Melbourne Vic 3086 Australia Yangzhou Univ Joint Int Res Lab Agr & Agri Prod Safety Minist Educ China Yangzhou 225127 Jiangsu Peoples R China

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.

关键词： c N P stoichiometry Elevated cO 2 Open -top chamber Rhizobacterial community Lupinus albus L

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Facile one-pot synthesis of c, O-codoped nano-structured g-c3N4 with superior photocatalytic hydrogen evolution

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MATERIALS RESEARcH BULLETIN 2022年 145卷 111565-111565页

作者： Zhao, Zhengliang Shu, Zhu Zhou, Jun Wang, Wenbin Li, Tiantian chen, Jieyu China Univ Geosci Fac Mat Sci & Chem Engn Res Ctr Nanogeomat Minist Educ 388 Lumo Rd Wuhan 430074 Peoples R China China Univ Geosci Zhejiang Res Inst Hangzhou 311300 Peoples R China Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China

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).

关键词： Nano-structured Photocatalytic hydrogen evolution g-c3N4 c O-codoped

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Analysis of amyloid and tau deposition in Alzheimer's disease using 11c-Pittsburgh compound B and 18F-THK 5351 positron emission tomography imaging

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World Journal of Nuclear Medicine 2022年第1期20卷 61-72页

作者： chotipanich chanisa Nivorn Monchaya Kunawudhi Anchisa Promteangtrong chetsadaporn Jantarato Attapon National Cyclotron and PET Centre Chulabhorn Hospital Chulabhorn Royal Academy Bangkok Thailand

This study aims to determine the deposition of

关键词： c Pittsburgh compound B F THK 5351 Alzheimer's disease positron emission tomography

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