Engineering
·
2019
·
IF 4.568
Lin Chen,Jing Feng
Ferroelastic AB O 4 type RETaO 4 and RENbO 4 ceramics (where RE stands for rare earth) are being investigated as promising thermal barrier coatings (TBCs), and the mechanical properties of RETaO 4 have been found to be better than those of RENbO 4 . In this work, B -site substitution of tantalum (Ta) is used to optimize the thermal and mechanical properties of EuNbO 4 fabricated through a solid-state reaction (SSR). The crystal structure is clarified by means of X-ray diffraction (XRD) and Raman spectroscopy; and the surface microstructure is surveyed via scanning electronic microscope (SEM). The Young’s modulus and the thermal expansion coefficient (TEC) of EuNbO 4 are effectively increased; with respective maximum values of 169 GPa and 11.2 × 10 −6 K −1 (at 1200 °C). The thermal conductivity is reduced to 1.52 W·K −1 ·m −1 (at 700 °C), and the thermal radiation resistance is improved. The relationship between the phonon thermal diffusivity and temperature was established in order to determine the intrinsic phonon thermal conductivity by eliminating the thermal radiation effects. The results indicate that the thermal and mechanical properties of EuNbO 4 can be effectually optimized via the B -site substitution of Ta, and that this proposed material can be applied as a high-temperature structural ceramic in future.
研究领域:
材料科学
·
固态物理
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Lijun Chen,Junfeng Zhu,Jie Song,Jing Yang,Yuhua Niu,Dong Zhao
Titanium dioxide-based materials treat wastewater contaminated by organic pollutants. However, the wide band gap and the ease of agglomeration limit its photocatalytic activity. PDA/PEI@TiO 2 @P-HSM composites were synthesized using PDA/PEI as an interfacial bonding modifier via polymerization reaction. Phase and chemical bonding analysis confirmed the modifiedTiO 2 coated P-HSM, which can effectively reduce the band gap and control the agglomeration of titanium dioxide, i.e., suitable to degrade RhB. Under UV irradiation, PDA/PEI @TiO 2 @P-HSM can remove RhB up to 90 % in 100 min. The photocatalytic degradation process conforms to the Langmuir-Hinshelwood quasi-primary equation. The composite exhibited excellent stability and recycling i.e., a high removal effect, with a removal rate of up to 60 % after seven cycles of reaction.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2017
·
IF 5.715
Shentan Liu,Yujue Wang,Bin Wang,Jun Huang,Shubo Deng,Gang Yu
Due to the lack of feasible regeneration methods, spent powdered activated carbon (PAC) is conventionally disposed of by incineration or landfill after its adsorption capacity is exhausted in adsorption applications. In this study, an electro-peroxone (EP) process (a combined process of conventional ozonation and in situ cathodic hydrogen peroxide (H 2 O 2 ) production) was proposed to regenerate PAC saturated with Rhodamine B (RhB) dye. Results show that the adsorption of RhB onto PAC involved primarily irreversible chemisorption . Therefore, the RhB-saturated PAC could not be regenerated upon dilution by water washing. In contrast, by oxidatively converting irreversibly sorbed RhB to more desorbable oxidation by-products (e.g., carboxylic acids), both ozonation and the EP regenerations could restore >90% of the adsorption capacity of the PAC for RhB reloading. However, ozonation regeneration could not effectively mineralize the desorbed pollutants due to the selective oxidation characteristics of ozone (O 3 ). In contrast, due to the substantial generation of hydroxyl radicals ( OH) from the reaction of bubbled O 3 with electro-produced H 2 O 2 , the EP regeneration was capable of completely mineralizing the desorbed pollutants. During the EP regeneration, PAC was oxidized to some extents, thus gradually losing its adsorption capacity. By optimizing the applied current, ozone dose, and regeneration time, ∼76% of the adsorption capacity of the virgin PAC could still be retained after five cycles of RhB adsorption and the EP regeneration. The results of this study indicate that the EP process may provide an environmentally-friendly and sustainable way to regenerate spent PAC for reuse.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2014
·
IF 3.065
Fei Ji,Chaolin Li,Yi Liu,Peng Liu
Cu/ZSM5 catalyst was prepared by wet impregnation method and used for the activation of peroxymonosulfate (PMS) and the subsequent decolorization of Rhodamine B (RhB). The as-prepared catalyst was characterized with X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and N 2 adsorption–desorption. The results showed that ZSM5 could effectively restrain the aggregation of CuO. The catalytic activity of Cu/ZSM5 was significantly higher than that of pure CuO due to its large surface area and uniform micropores. Furthermore, effects of several operational parameters such as pH of solution, PMS amount, Cu loading rate, and initial RhB concentration on the decolorization efficiency were investigated in detail. Finally, the stability of the Cu/ZSM5 was studied and the catalyst maintained high catalytic activity with the color removal more than 95% in 1 h after several rounds of regeneration.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2022
·Vol. 41
·期 3
·307-313
·
IF 5.56
Run-Ze Yuan,Peng-Fei Cui,Yue-Jian Lin,Guo-Xin Jin
Comprehensive Summary Herein, we describe the synthesis of a carborane-supported octanuclear palladacycle complex, Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (CH 3 CN) 4 (complex 1 ), with B(3)–H activations on o -carborane ligand. The substitution reaction of 1 has been explored, and three of its substituted complexes Pd 8 ( o -C 2 B 10 H 10 CS 2 CH 3 ) 4 Cl 4 (L) 4 (L = t BuNC, 2 ; L = C 5 H 5 N, 3 ; L = C 4 H 8 S, 4 ) have been synthesized. The m - and p -carborane disubstituted ligands m - and p -C 2 B 10 H 10 (CS 2 CH 3 ) 2 (ligands 5 and 6 ) as well as their B—H activated carborane complexes [ m -C 2 B 10 H 9 (CS 2 CH 3 ) 2 PdCl] ( 7 ) and [ p -C 2 B 10 H 8 (CS 2 CH 3 ) 2 ][PdCl( t BuNC)] 2 ( 8 ) have also been synthesized by the similar method. All of these complexes have been characterized, including X-ray single crystal diffraction, NMR spectroscopy, IR spectroscopy and elemental analysis methods.
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 4
·4209-4215
·
IF 3.056
Tong Huiyan,Jiang Qianyi,Zhong Xiaocong,Hu Xingshuai
In the recent years, microplastics have attracted much attention as new emerging environmental pollutants. Previously, several studies were performed to understand the source and fate of microplastics in the environment, organisms, and food webs. To track microplastics and improve their legibility, labeling them is a very effective method during laboratory experiments. This study presents an effective Rhodamine B dye (RhB) staining method for microplastics. The method is crucial for the visual observation of white or transparent plastics by dyeing them in purple or pink, as well as makes the microplastics to fluoresce under common microscope fluorescence filter ranges. Five types of microplastic polymers, namely polyethylene, polypropylene, polystyrene, polyvinyl chloride, and polyurethane were used as the test materials. The efficiencies of ethanol, acetone, and distilled water as possible solvents for dissolving RhB were investigated. Next, the fluorescence stability in various conditions was assessed. The results indicated that ethanol was the most appropriate solvent in dissolving RhB used in staining the microplastics. RhB was fluorescently stable under varying conditions (light and gut fluid) or different solutions (KOH, nitric acid, and saturated NaCl). Additionally, RhB staining exhibited an insignificant effect on the Raman spectra of the microplastics. Our proposed method is simple and robust and helps to visualize the different types of microplastic polymers tested in laboratory experiments, particularly the transparent, white, and small size microplastics.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 43
·期 2
·514-523
·
IF 2.516
Honghong Li,Wencheng Zhang,Zeyu Wu,Xusheng Huang,Ailing Hui,Yiwen He,Haiyan Wang
Ginkgolide B is in great demand worldwide on account of its extensive and excellent pharmacological effects, however, it is difficult to separate and purify ginkgolide B. In this study, ginkgolide B molecularly imprinted polymers were prepared by combining software simulation and molecular imprinting technique, and its characterization and adsorption performed evaluation were performed to understand the adsorption behavior of the polymers. The adsorption equilibrium concentration of molecularly imprinted polymers was 0.70 mg/mL, and the adsorption equilibrium time was 4 h. Meanwhile, the adsorption isotherm of the polymers for ginkgolide B fitted well with the Langmuir model, and the adsorption kinetics was in line with the pseudo-second-order kinetics. In contrast, the adsorption capacity of molecularly imprinted polymers on ginkgolide B was higher than that of non-molecular imprinted polymers, with better selectivity and better adsorption after repeated use for six times. The application experiments showed that molecular imprinted polymers have a good adsorption effect in low purity samples. Therefore, the polymers reported herein can be expected to apply in the adsorption and separation of ginkgolide B samples.
研究领域:
药学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Technology & Innovation
·
2020
·
IF 3.356
Vu Thi Quyen,Le Thi Thu Ha,Dang My Thanh,Quyet Van Le,Nguyen Minh Viet,Nguyen Thi Nham,Phan Quang Thang
Advanced synthesis of nanoflower structures consisting of TiO 2 @Ti 3 C 2 nanoflowers with three-dimensional (3D) porous frameworks from two-dimensional (2D) Ti 3 C 2 MXene was done and applied for degradation of organic pollutant. The special structure of material was created by the in situ transformation, starting from Ti 3 C 2 T x MXene as provision of Ti source. The basis properties of material were characterized by SEM, TEM , XRD and XPS. The Ti 3 C 2 T x MXene showed layered structure and then this morphology was replaced by nanoflower spheres with rapid growth of TiO 2 @Ti 3 C 2 nanowhiskers. In terms of application, the TiO 2 @Ti 3 C 2 heterojunction showed an extraordinary photocatalytic efficiency toward Rhodamine B (RhB) compared to performances of pristine Ti 3 C 2 , and commercial TiO 2 . In addition, the TiO 2 @Ti 3 C 2 composite also displays the good recyclability even after 5th degradation cycles. Based on the finding, it gains a deeper insight into practical applications of 2D transition metal carbide for treatment of organic pollutants in wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Linna Sha,Peng Gao,Xiaobo Li,Xuefeng Bai
In this work, amorphous CoB has been uniformly coated on C 60 surfaces through a simple ball milling process. Accordingly their XRD , SEM and TEM measurements clarify their related composite structures. Especially, a C-B chemical bond has been found through its XPS measurement, which enhanced the composite's stability and electrochemical activity. And the following electrochemical experimental results demonstrated that the as-obtained C 60 /CoB composite had considerably high storage capacities of 602 mA h/g, which were much higher than those of individual C 60 and CoB. Furthermore their hydrogen storage processes and the mechanism have also been investigated.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Oncotarget
·
2016
·
IF 5.008
Dong Yang,Xinchuan Zheng,Ning Wang,Shijun Fan,Yongjun Yang,Yongling Lu,Qian Chen,Xin Liu,Jiang Zheng
Free bacterial lipopolysaccharide (LPS) is generally removed from the bloodstream through hepatic uptake via TLR4, the LPS pattern recognition receptor, but mechanisms for internalization and clearance of conjugated LPS are less clear. Kukoamine B (KB) is a novel cationic alkaloid that interferes with LPS binding to TLR4. In this study, KB accelerated blood clearance of LPS. KB also enhanced LPS distribution in the hepatic tissues of C57 BL/6 mice, along with LPS uptake in primary hepatocytes and HepG2 cells. By contrast, KB inhibited LPS internalization in Kupffer and RAW 264.7 cells. Loss of TLR4 did not affect LPS uptake into KB-treated hepatocytes. We also detected selective upregulation of the asialoglycoprotein receptor (ASGPR) upon KB treatment, and ASGPR colocalized with KB in cultured hepatocytes. Molecular docking showed that KB bound to ASGPR in a manner similar to GalNAc, a known ASGPR agonist. GalNAc dose-dependently reduced KB internalization, suggesting it competes with KB for ASGPR binding, and ASGPR knockdown also impaired LPS uptake into hepatocytes. Finally, while KB enhanced LPS uptake, it was protective against LPS-induced inflammation and hepatocyte injury. Our study provides a new mechanism for conjugated LPS hepatic uptake induced by the LPS neutralizer KB and mediated by membrane ASGPR binding.
研究领域:
免疫学
·
肝病学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2022
·Vol. 157
·期 21
·
IF 4.304
Li Dong,He Xiaoxiao,Zhao Litao,Li Haoyang,Zhang Xiaolei,Chen Jinquan,Jin Qingyuan,Xu Jianhua
Graphene and its derivatives, due to their two-dimensional carbon nanostructures, have provided new opportunities to fortify organic dye-based photovoltaic and photocatalytic assemblies. In this article, we employed organic dyes Rhodamine B (RdB) and graphene oxide (GO) [or reduced graphene oxide (RGO)] to assemble the composite materials RdB–GO and RdB–RGO. It was found that both GO and RGO could strongly quench the fluorescence (FL) intensity of RdB. The mechanisms of FL quenching in both RdB–GO and RdB–RGO have been investigated by using femtosecond fluorescence up-conversion and transient absorption spectroscopy. When RdB was anchored on the GO (or RGO) surface, the solvent relaxation component 3.1 ps of pure RdB disappeared; instead, the ultrafast excited state electron transfer process (1–2ps) in RdB-GO and RdB-RGO was found and originated from the LUMO of RdB to the conduction band of GO (or RGO). We further reveal that the energy level change caused by GO reduction makes the energy levels of RGO closer to those of RdB, resulting in the electron transfer being more effective in RdB–RGO. Therefore, the RdB–RGO composite materials may have higher application values for dye-sensitized solar cells.
研究领域:
材料科学
·
光化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 8
·3588-3594
·
IF 3.591
Qingqing Gao,Qian Lei,Ruoyan Miao,Manyi Gao,Hu Liu,Qin Yang,Yequn Liu,Fang Song,Yongsheng Yu,Weiwei Yang
Polymeric carbon nitride (PCN) is an emerging metal-free photocatalyst with high stability but is plagued by low photocatalytic efficiency due to the rapid charge carrier recombination behavior. Herein, Bi-doped graphitic carbon nitride nanotubes (BCN nanotubes) with a porous structure have been facilely prepared by one-step thermal polymerization of mixtures of melamine, urea and bismuth nitrate pentahydrate under an Ar atmosphere. With unique structural advantages for charge carrier transfer, light harvesting, and large surface area, the as-prepared BCN nanotubes exhibit excellent photocatalytic activity for the degradation of Rhodamine (Rh) B with a 26.8-fold higher reaction rate than that of PCN under visible light irradiation. This work provides informative principles about the synthesis of PCN with controlled morphology and element doping simultaneously for the photocatalytic degradation of chemical pollutants.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）