Anti-ablation properties of ZrB2 modified carbon/phenolic composites in plasma wind tunnel DOI Open Access
Andi Lin, Haiming Huang, Shuang Wang

и другие.

Journal of Composite Materials, Год журнала: 2023, Номер 58(1), С. 3 - 12

Опубликована: Ноя. 15, 2023

Improving the ablative resistance of carbon/phenolic (C/Ph) composites is an urgent need in field thermal protection hypersonic vehicles. In this paper, novel C/Ph are fabricated by introducing different contents ZrB 2 ceramic particles, and anti-ablation properties tested plasma wind tunnel. Under mainstream conditions with enthalpy 21.84 MJ/kg, heat flux 1.6 MW/m , pressure kPa, effects content on stability, linear ablation rate surface temperature further analyzed. The maximum positively correlated . As increases, back face materials decreases gradually, while increases slightly after a significant decrease. When time 50 s, sample 7% lowest (0.0184 mm/s). These dates tunnel test could provide reference for applications composites. oxidation contributes significantly to improving its severe environments. Accordingly, optimizing enables development high-performance enhanced properties, reduced rates, making them well-suited applications.

Язык: Английский

Sodium Alginate–CuS Nanostructures Synthesized at the Gel–Liquid Interface: An Efficient Photocatalyst for Redox Reaction and Water Remediation DOI

Likhi Dhruv,

Deepak K. K. Kori, Apurba K. Das

и другие.

Langmuir, Год журнала: 2023, Номер 39(27), С. 9439 - 9452

Опубликована: Июнь 28, 2023

The use of visible light to propel chemical reactions is an exciting area study that crucial in the current socioeconomic environment. However, various photocatalysts have been developed harness light, which consume high energy during synthesis. Thus, synthesizing at gel–liquid interfaces ambient conditions scientific importance. Herein, we report environmentally benign sodium alginate gel being used as a biopolymer template synthesize copper sulfide (CuS) nanostructures interface. driving force for synthesis CuS varied by changing pH reaction medium (i.e., 7.4, 10, and 13) tailor morphology nanostructures. nanoflakes obtained 7.4 transform into nanocubes when raised deform 13. Fourier infrared spectroscopy (FTIR) confirms all characteristic stretching alginate, whereas are crystallized hexagonal crystal system, revealed powder X-ray diffraction analysis. high-resolution photoelectron (XPS) spectra show +2 −2 oxidation states (Cu) sulfur (S) ions, respectively. physisorbed higher concentration greenhouse CO2 gas. Owing lower band gap synthesized compared other prepared 10 13, photocatalytically degrades 95% violet 98% methylene blue aqueous dye solutions 60 90 min, respectively, under illumination. Additionally, alginate–copper (SA-CuS) demonstrate excellent performance photoredox convert ferricyanide ferrocyanide. research opens door developing new photocatalytic pathways wide range photochemical involving nanoparticle-impregnated composites on interfaces.

Язык: Английский

Процитировано

6
New updates on vanadate compounds synthesis and visible-light-driven photocatalytic applications DOI Creative Commons

Mehrdad Mirzaei,

Asieh Akhoondi, Wael Hamd

и другие.

Synthesis and Sintering, Год журнала: 2023, Номер 3(1), С. 28 - 45

Опубликована: Март 30, 2023

Photocatalysis is known as a new and cost-effective method to solve the problems of energy shortage environmental pollution. Although application this seems practical, finding an efficient stable photocatalyst with suitable bandgap visible-light sensitivity remains challenging. In context, vanadate compounds photocatalysts have been synthesized used emerging composites, their efficiency has improved through elemental doping morphology modifications. review, major synthesis methods, design latest photocatalytic based on are presented. addition, effect microstructures various applications such hydrogen production, CO2 reduction, removal organic pollutants heavy metals discussed. For instance, 2D-1D BiVO4/CdS heterostructure enhances 40 times production from benzyl alcohol than pure BiVO4. Similarly, InVO4/Bi2WO6 composite superior capability for reduction into CO compared InVO4. A rate 18 μmol.g−1.h−1 can be achieved by using heterostructure. Regarding pollutants' removal, use Montmorillonite/BiVO4 structure allows complete Brilliant Red 80 dye after only 2 hours irradiation. Finally, copper metal reduced 90 % in water, BiVO4/rGO/g-C3N4 optimized structure. Other examples decorated enhancing activities also treated.

Язык: Английский

Процитировано

4
Evolution hydrothermal aging mechanism for Ag/CeO2 catalysts in regeneration of catalytic diesel particulate filter with DFT calculation DOI
Zonglin Li,

Ni Hong,

Pan Wang

и другие.

Environmental Science and Pollution Research, Год журнала: 2023, Номер 30(30), С. 76143 - 76156

Опубликована: Май 26, 2023

Язык: Английский

Процитировано

3
Selective and sensitive colorimetric detection of Cr(VI) using porous M3V2O8 (M= Ni, Cu, and Zn) nanostructures as oxidase mimics DOI
Fahime Vetr, Hadi Fallah Moafi, Zeinab Moradi–Shoeili

и другие.

International Journal of Environmental & Analytical Chemistry, Год журнала: 2023, Номер unknown, С. 1 - 23

Опубликована: Июль 7, 2023

Given that hexavalent chromium ions (Cr(VI)) are among the most biologically toxic heavy metal in environment, it would be desirable to develop approaches easy-to-use, practical, and cost-effective for monitoring Cr(VI) content environmental matrices. Herein, we report a colorimetric assay detection based on oxidase-like activity of series nanoscale substituted transition vanadates (STMVs) with general formula M3V2O8, where M represents divalent cations such as Ni2+, Cu2+, Zn2+. The structural physicochemical characterisations indicated mesoporous Cu3V2O8 Ni3V2O8 roughly nano-spherical morphologies were successfully formed monoclinic orthorhombic phases, respectively. In addition, micro/mesoporous Zn3V2O8 had uniform hexagonal nanosheets an crystalline phase. UV-vis spectroscopy showed oxidised O-phenylenediamine (OPD) 2,3-diaminophenazine (DAP); however, did not exhibit desired activity. Under optimised reaction conditions, simple, fast, low-cost sensor was designed outstanding (Vmax = 0.25 µM s−1) detect Cr(VI). Cu3V2O8/OPD system operated selectively against other ions, lowest detectable [Cr(VI)] within linear range 2–32 μM 0.24 μM, which is lower than standard levels (0.96 µM) drinking water set by World Health Organisation (WHO). This technique also applicable assessing untreated tap Caspian Sea samples. analytical results reliably developed sensitive thermal stability determination sources intrinsic oxidase mimic.

Язык: Английский

Процитировано

3
Anti-ablation properties of ZrB2 modified carbon/phenolic composites in plasma wind tunnel DOI Open Access
Andi Lin, Haiming Huang, Shuang Wang

и другие.

Journal of Composite Materials, Год журнала: 2023, Номер 58(1), С. 3 - 12

Опубликована: Ноя. 15, 2023

Improving the ablative resistance of carbon/phenolic (C/Ph) composites is an urgent need in field thermal protection hypersonic vehicles. In this paper, novel C/Ph are fabricated by introducing different contents ZrB 2 ceramic particles, and anti-ablation properties tested plasma wind tunnel. Under mainstream conditions with enthalpy 21.84 MJ/kg, heat flux 1.6 MW/m , pressure kPa, effects content on stability, linear ablation rate surface temperature further analyzed. The maximum positively correlated . As increases, back face materials decreases gradually, while increases slightly after a significant decrease. When time 50 s, sample 7% lowest (0.0184 mm/s). These dates tunnel test could provide reference for applications composites. oxidation contributes significantly to improving its severe environments. Accordingly, optimizing enables development high-performance enhanced properties, reduced rates, making them well-suited applications.

Язык: Английский

Процитировано

3