ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 46
·102880-102893
·
IF 5.8
Li Yunhe,Li Hao,Zhao Baogang,Ma Yanming,Liang Peiyuan,Sun Tianjun
The escalating levels of surface ozone concentration pose detrimental effects on public health and the environment. Catalytic decomposition presents an optimal solution for surface ozone removal. Nevertheless, catalyst still encounters challenges such as poisoning and deactivation in the high humidity environment. The influence of support on catalytic ozone decomposition was examined at a gas hourly space velocity of 300 L·g −1 ·h −1 and 85% relative humidity under ambient temperature using Cu-Mn–doped oxide catalysts synthesized via a straightforward coprecipitation method. Notably, the Cu-Mn/SiO 2 catalyst exhibited remarkable performance on ozone decomposition, achieving 98% ozone conversion and stability for 10 h. Further characterization analysis indicated that the catalyst’s enhanced water resistance and activity could be attributed to factors such as an increased number of active sites, a large surface area, abundant active oxygen species, and a lower Mn oxidation state. The catalytic environment created by mixed oxides can offer a clearer understanding of their synergistic effects on catalytic ozone decomposition, providing significant insights into the development of water-resistant catalysts with superior performance. Graphical
研究领域:
环境催化
·
大气污染控制
·
材料化学
·
表面科学
·
催化化学
·
环境工程
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Xia Hua,Zhihong Gao,Qianqian Wang,Wenming Hao,Xiaoliang Yan,Ruifeng Li
The accumulation of heavy metal on catalysts during petrochemical process produces deactivated catalysts that cannot be directly disposed in nature, due to the high toxicity. The elimination of the detrimental effect of heavy metal ions can be achieved by immobilizing these ions in the form of spinel structure, yet this requires high-temperature calcination . Herein, Ni 2+ ions are stabilized and confined within the surface NiAl 2 O 4 on Al 2 O 3 through hydrothermal process and subsequent low-temperature thermal treatment. The formation of nickel aluminum layered double hydroxide (NiAl-LDH) as intermediate favors the generation of surface aluminate spinel at the temperature as low as 450 °C. The formation of surface spinel is beneficial to restricting the mobility of Ni 2+ ions. The growth and immobilization mechanisms of the surface spinel structure were proposed, which contributes to alternative and promising route for the low-temperature approach of the retention of the heavy metal ions mobility.
研究领域:
环境催化
·
材料化学
·
工业化学
·
固体化学
·
污染控制
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Zihan Zhou,Yunwen Wu,Huiqin Ling,Jie Guo,Su Wang,Ming Li
3D NAND flash memory with vertically stacked cells has been developed to break through the limits of technology nodes. However, during the selective etching process, it is difficult to ensure the byproducts diffuse away from the trenches in the multistacked layers. Once saturated, the byproduct causes abnormal redeposition on the SiO 2 layers. This problem has restricted the development of high-density 3D NAND memory. To solve this problem, the composition and formation mechanism of the redeposited layer must be clarified. In this study, a ternary-wafer system comprising a Si 3 N 4 /SiO 2 /Si 3 N 4 stack was fabricated to study the redeposition mechanism, and the morphology, elastic properties , and chemical composition of the redeposited layer were clarified. The redeposited layer consists of spherical particles with elastic surfaces (average Young’s modulus of 24.17 GPa). The particles were confirmed to comprise colloidal silica gel covered by silanols . By considering the chemistry of silica , the redeposition mechanism was proposed as follows: colloidal silica gel is formed by the aggregation of silicic acids from Si 3 N 4 etching, which adsorb onto the SiO 2 layer through oxide bridges and hydrogen bonding . Our work will contribute to the development of high-density 3D NAND memory.
研究领域:
微电子学
·
半导体工艺
·
材料科学
·
表面化学
·
纳米材料
·
固态物理
·
集成电路制造
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2016
·Vol. 23
·期 4
·2539-2548
·
IF 3.195
He Hui,Hou Xunan,Ma Beibei,Zhuang Linzhou,Li Chuanfa,He Shihong,Chen Shuixia
Viscose fiber was oxidized with sodium periodate to prepare a reactive dialdehyde viscose fiber (DAVF) containing abundant aldehyde groups. A solid amine adsorbent (DAVF-PEI) with high amino density for CO 2 capture was then prepared by modifying DAVF with polyethylenimine (PEI). Response surface methodology (RSM) based on a three-level, three-factorial design was used to optimize the synthesis conditions of DAVF, in which multiple linear regression equations of aldehyde content and fiber mass loss degree were constructed. The well-designed DAVF was then employed as a support to graft with PEI via Schiff base reaction to prepare a solid amine fiber (DAVF-PEI) for CO 2 adsorption. The experimental results verified that DAVF-PEI possessed good thermo-stability and high CO 2 adsorption capacity (4.11 mmol/g). DAVF-PEI also showed promising regeneration performance, which could maintain almost the same adsorption capacity for CO 2 after ten adsorption and desorption recycles.
研究领域:
材料化学
·
环境科学
·
高分子科学
·
化学工程
·
吸附分离
·
碳捕集技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xiaowei Kong,Xiaoliang Zhou,Yu Tian,Xiaoyan Wu,Jun Zhang,Wei Zuo,Xiaobo Gong,Zhanhu Guo
A novel La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3-δ (LCFNb) perovskite for solid oxide fuel cells (SOFCs) anode is prepared by means of the citrate-nitrate route and composited with Ce 0.8 Sm 0.2 O 1.9 (SDC) by impregnation method to form nano-scaled LCFNb/SDC anode catalytic layers. The single cells with LCFNb and LCFNb/SDC impregnated anodes both achieve relatively high power output with maximum power densities (MPDs) reaching up to 610, 823 mW·cm −2 in H 2 at 800 °C, respectively, presenting a high potential of LCFNb for use as SOFCs anode. The power outputs of the single cells with LCFNb/SDC composite anode in CO and syngas (CO H 2 mixture) are almost identical to that in H 2 at each testing temperature. This composite anode also presents excellent durability in both H 2 and CO for as long as 50 h, showing desirable anti-reduction and carbon deposition resistance abilities. Besides, the cell output is stable in 100 ppm H 2 S H 2 atmospheres for 20 h at a current density of 600 mA·cm −2 with negligible sulfur accumulation on the anode surface . Hence, a novel iron based perovskite LCFNb anode with remarkable cell performance, carbon deposition resistance and sulfur poisoning tolerance for SOFCs is successfully obtained.
研究领域:
材料科学
·
电化学
·
能源材料
·
无机非金属材料
·
功能陶瓷
·
清洁能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 27
·期 4
·3549-3556
·
IF 1.569
Wang Lu,Yang Zhouyong,Ni Xiuyuan
We prepare the mesoporous polythiophene–WO 3 film through in situ polymerization which is initiated by WO 3 , and fabricate the electrochromic device with the composite film. The influences of the electrolyte ions, film morphologies and counter electrode on the electrochromism of the devices are explored by UV–Vis transmittance spectra and cyclic voltammetry tests. With the aim to enhance the contrast optical transmittance, we develop the binary composite electrolytes of LiClO 4 and N(C 4 H 9 ) 4 ClO 4 solution which can promote intercalation/deintercalation process. Besides that, we use polyethylene oxide as pore-forming agent on the polythiophene–WO 3 films, so that it will be easier for electrolyte ions to diffuse in the porous film. A NiO layer also has a complementary effect on the cathodic coloration films and increases the contrast optical transmittance remarkably. Equipped with the binary electrolyte and the NiO layer as the counter electrode, the film device exhibits high performance with the contrast optical transmittance (ΔT) of 62 % and the coloration efficiency of 212.6 cm 2 /C.
研究领域:
材料科学
·
电化学
·
功能材料
·
纳米材料
·
能源材料
·
表面科学
✓ 已验证
DOI
高影响因子
Waste and Biomass Valorization
·
2024
·Vol. 15
·期 7
·4353-4372
·
IF 2.6
Shankaranarayana Sahana Hosanagara,Gajanana Vijayalaxmi Karki,Chavan Mohan,Chavannavar Suvarna V.,Doddanagappa Shobha
Purpose To analyse phytochemical composition, antioxidant potential, antimicrobial activity and α-amylase, α-glucosidase and xanthine oxidase inhibitory potential of corn silk extracts derived from the Syngenta 5414 corn variety. Methods Corn silk sample was lyophilized and extracted using 80% ethanol, methanol, water or acetone. Phytochemicals were qualitatively screened and bioactive compounds were identified through GCMS. Antimicrobial activities were evaluated using the agar well method for bacteria and fungal biomass method for fungi. The extracts were subjected to evaluation for their antidiabetic activity through α-amylase and α-glucosidase inhibitory assays, while their anti-gout potential was assessed through xanthine oxidase inhibitory assay, encompassing all four solvent extracts in the study. Results Phytochemical screening revealed the presence of phenols, flavonoids, tannins, alkaloids, sterols, protein xanthoproteic, and cardiac glycosides in the extracts. The Folin-Ciocalteu and AlCl 3 assays demonstrated higher yields of phenolics and flavonoids in 80% ethanolic extract. Furthermore, the extracts remarkably scavenged reactive oxygen species like DPPH, ABTS and elicited considerable ferric ion reducing antioxidant power. GC–MS analysis identified 21 compounds in the 80% ethanolic extract, with 1,2,3-Propanetriol-1-acetate, n-Hexadecanoic acid, and 4H-Pyran-4-one,2,3-dihydro-3,5-dihydroxy-6-methyl- as major components. Antimicrobial assays demonstrated the ethanolic (80%) and methanolic extract's remarkable ability to inhibit the growth of Gram-positive bacteria and exhibit anti-fungal properties. The ethanolic (80%) extract exhibited an IC 50 value of 0.70 ± 0.02 and 0.71 ± 0.01 mg against α-amylase and α-glucosidase, respectively, and 33.76 ± 0.43 mg against xanthine oxidase. Conclusion Corn silk exhibits potential as a valuable reservoir of natural bioactive compounds endowed with a wide array of health-promoting properties. Graphical
研究领域:
天然产物化学
·
药用植物学
·
生物化学
·
药物代谢
·
微生物学
·
内分泌药理学
·
代谢性疾病
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yan Zhao,Yang Gao
The microstructure of plasma-sprayed nanostructured yttria-stabilized zirconia (YSZ) coatings may change during high-temperature exposure, which would influence the coating performance and service lifetime. In this study, the phase structure and the microstructural evolution of 3YSZ (zirconia-3 mol% yttria) and 5YSZ (zirconia-5 mol% yttria) nanostructured coatings were investigated by means of sintering at 1400 °C for 50–100 h. The microhardness, elastic moduli, and thermal shock cycles of the 3YSZ and 5YSZ nanostructured coatings were also investigated. The results showed that the redistribution of yttrium ions at 1400 °C caused the continuous increase of monoclinic-phase zirconia, but no obvious inter-splat cracking formed at the cross-sections, even after 100 h. Large voids appeared around the nanoporous zone because of the sintering of nanoscale granules upon high-temperature exposure. The microhardness and elastic moduli of the nanostructured coatings first increased and then decreased with increasing sintering times. The growth rate of the nanograins in the 3YSZ coating was lower than that in 5YSZ, which slowed the changes in 3YSZ coating porosity during sintering. Although the 3YSZ coating was prone to monoclinic phase transition, the experimental results showed that the thermal shock resistance of the 3YSZ coating was better than that of the 5YSZ coating.
研究领域:
材料科学
·
表面工程
·
陶瓷涂层
·
热障涂层
·
高温材料
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21569-21577
·
IF 7.443
Zhaoqiang Li,Longwei Yin
A sandwich-like structure with reduced graphene oxide (RGO) wrapped MOF-derived ZnCo2O4–ZnO–C polyhedrons on nickel foam as an anode for high performance lithium ion batteries (LIBs) is for the first time reported via simply growing MOFs on Ni foam, and wrapping graphene oxide nanosheets on MOFs, and then annealing under a N2 atmosphere. It should be noted that the MOF-derived porous products are composed of carbon-coated spinel ZnCo2O4–ZnO nanoparticle polyhedrons. When tested as anodes for LIBs, the unique RGO/ZnCo2O4–ZnO–C/Ni sandwich-structured LIB anodes exhibit superior coulombic efficiency, excellent cycling stability and rate capability. The in situ formed carbon layers outside the ZnCo2O4–ZnO act as not only a conductive substrate but also a buffer layer for volume changes. The open pores in ZnCo2O4–ZnO–C polyhedrons provide sufficient electrolyte as well as serve as cushion space to further alleviate volume changes. The RGO nanosheets act as a flexible protector to firmly fix polyhedrons on the Ni foam, as well as a conductive substrate to wire up all the polyhedrons. The interconnected carbon layers and two high conductive substrates (RGO and Ni foam) together form an unhindered highway for charge transfer during discharge/charge processes, promising good electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
固态化学
·
电极工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2017
·
IF 4.292
Lijun Zhao,Haiyang Cheng,Tong Liu,Yan Li,Zhong Ying,Wenjing Yang,Weiwei Lin,Xiangchun Meng,Chengxue Wang,Fengyu Zhao
An efficient green process was developed for production of p -aminophenol (PAP) from hydrogenation of nitrobenzene (NB) over a traditional Pt/Al 2 O 3 catalyst in a reaction medium of supercritical CO 2 (scCO 2 ) and H 2 O without any additional acid catalyst involved. The combination of scCO 2 and H 2 O was confirmed to be effective for the production of PAP. The acidity, aroused by the in situ formed carbonic acid, increased with CO 2 pressure, which acted as acid catalysis during the reaction, and it can easily self-neutralize by depressurization of CO 2 , resulting in a green and a intensive process for it removed the final neutralization and salts disposal of the traditional liquid acids. Under the optimal reaction conditions, a high yield to PAP (68.9%) was achieved at the high conversion of NB (98.5%). Moreover, the results of in situ diffuse reflectance FTIR spectra revealed that CO was generated by the reverse water-gas shift reaction (CO 2 + H 2 → CO + H 2 O), it can adsorbed on the surface of Pt/Al 2 O 3 to suppress the undesired deep hydrogenation of N -phenylhydroxylamine (PHA) to aniline (AN), which also contributed to the obtained high selectivity of PAP. Therefore, the present green and efficient catalysis process will arouse the interest of researchers in the fields of the green and sustainable organic synthesis.
研究领域:
绿色化学
·
有机合成
·
催化化学
·
环境友好工艺
·
工业化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2011
·
IF 3.723
Hui Wang,Yuming Huang
Prussian-blue (PB)-modified γ-Fe 2 O 3 magnetic nanoparticles (PBMNPs) were successfully synthesized based on electric interactions between negatively charged [Fe(CN) 6 ] 4− and positively charged γ-Fe 2 O 3 nanoparticles. The in situ PB coating was generated by the coordinating reaction between the adsorbed [Fe(CN) 6 ] 4− and the ferric ions on the surface of γ-Fe 2 O 3 NPs. The as-prepared PBMNPs were characterized by FT-IR, XRD, TEM, and used to remove organic pollutants from aqueous solution, namely, using methylene blue (MB) as model compound. The experimental results showed that the target compound could be removed efficiently from solution over a wide pH range from 3 to 10 in the presence of PBMNPs as peroxidase-like catalyst and H 2 O 2 as oxidant. Under optimal conditions, MB could be removed completely after 120 min of reaction at 298 K; the chemical oxygen demand (COD) removal efficiency and the total organic carbon (TOC) abatement efficiency were 53.6% and 35%, respectively. Furthermore, the PBMNPs catalysts showed high magnetization, temperature tolerance, long-term storage and operational stability, and they could be readily separated from solution by applying an external magnetic field. Finally, a possible reaction mechanism for MB degradation was also discussed.
研究领域:
环境科学
·
纳米材料学
·
催化化学
·
水处理技术
·
环境功能材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2011
·Vol. 52
·期 23
·5312-5319
·
IF 3.829
Dongyang Chen,Shuanjin Wang,Min Xiao,Dongmei Han,Yuezhong Meng
High-molecular-weight bulky-block poly(fluorenyl ether thioether ketone)s were successfully synthesized by a two steps one-pot protocol using N,N′ -dimethy- S -carbamate masked dithiols for vanadium redox flow battery (VRB) application. The followed sulfonation procedure gave birth to novel sulfonated block poly(fluorenyl ether thioether ketone)s (SPFETKs) with controlled ionic exchange capacities (IEC). Membranes with proton conductivities higher than (IEC > 1.66 mequiv. g −1 ) or comparable to (IEC < 1.66 mequiv. g −1 ) that of Nafion117 membrane were achieved. The VO 2+ permeabilities of SPFETKs membranes were much lower than that of Nafion117 membrane. The thermal properties, mechanical properties, oxidative stability , water uptake, proton conductivity, VO 2+ permeability and cell performance were investigated in detail.
研究领域:
高分子化学
·
能源材料
·
电化学
·
膜科学与技术
·
功能高分子
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）