JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Lijun Chen,Jia Shao,Qijian Yu,Sui Wang
Although self-healing hydrogels have attracted widespread attention in many fields, it remains a challenge for hydrogel simultaneously achieving toughness, self-healing, and self-healing capabilities. Thus, we introduced GO and borate ions into the PVA chain and successfully constructed a physical-chemical double-crosslinked PVA/Borax/GO hydrogel with excellent mechanical properties, self-recovery, self-healing ability at room temperature, and conductivity. Among them, the hydrogen bond and borate ion jointly stimulate the strong interaction between the PVA chain and each component, making the PVA/Borax/GO hydrogel network closer, providing a solid pressure-resistant platform with excellent anti-fatigue performance, in which dynamic PVA/Borax networks endow hydrogel with self-healing ability. The prepared PVA/Borax/GO hydrogel has high stability, elasticity and electrical conductivity, and can be suitable for the preparation of preparing sensing materials. This work provides a design strategy for the preparation of hydrogels with high mechanical properties, fatigue resistance and good self-healing capabilities.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 107
·期 1
·70-82
·
IF 2.326
Wang Kai,Liu Shanchi,Yang Mengxue,Jin Zhiliang
CdS and layered double hydroxides (LDHs) have drawn wide attention for photocatalytic water decomposition due to their abundant structure and excellent properties. The construction of a heterogeneous structure is a widely used method for a single material to overcome their narrow spectral light response and inefficient charge separation. In this work, a CdS/CoAl LDH step-scheme (S-scheme) heterojunction photocatalyst was successfully constructed by coupling CdS and CoAl LDH based on the complementary properties of the two materials. Compared with single CdS and CoAl LDH, the prepared CdS/CoAl LDH composite photocatalyst shows excellent photocatalytic hydrogen production efficiency by efficient use of electrons and holes under visible light irradiation. A significant number of electrons in the S-scheme heterojunction photocatalyst can be efficiently used to participate in water splitting while the holes were consumed by the sacrificial reagent. Therefore, the building of the S-scheme heterojunction eventually improved the efficiency of photocatalyst hydrogen production by efficiently separating electrons and holes. At the same time, our work will provide a new approach for the practical application of such semiconductors.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Tianqing Zhao,Jinkun Tan,Wanglin Zhou,Zhenbin Gu,Yongqiang Niu,Zhengkun Liu,Guangru Zhang,Wanqin Jin
BaZr 0.7 Ce 0.2 Y 0.1 O 3-δ (BZCY), a perovskite-type mixed protonic and electronic conducting oxide , holds significant potential for H 2 separation and purification as a membrane. The introduction of a porous modification layer as an exchange-active component offers a potential solution to enhance H 2 permeability. However, achieving the desired porous/dense structure presents a notable challenge for practical implementation. In this study, various methods were developed to address sintering kinetics, encompassing both chemical aspects (e.g., interlayer reactions) and physical factors (e.g., thermal expansion), for fabricating a porous BZCY modification layer on a 4-channel BZCY hollow fiber membrane. The optimal composite hollow fiber membrane , resulting from a combination of readily sintered hollow fiber and powders for constructing the porous layers , exhibits an exceptional H 2 permeation flux of 0.48 mL min −1 cm −2 at 900 °C using 50 % H 2 /N 2 as the feed gas, which represents a threefold increase compared to the performance of the bare BZCY membrane. The H 2 permeation flux stabilized at 0.52 mL min −1 cm −2 for 500 h under water vapor conditions. These findings enabled us to identify the most effective approach, unlocking the full potential of surface-modified hollow fiber membranes and advancing their capabilities in H 2 permeation applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2013
·Vol. 299
·期 3
·361-367
·
IF 2.338
Weining Sun,Xiaofeng Lu,Yanpeng Xue,Yan Tong,Ce Wang
In this report, CoFe 2 O 4 /Polypyrrole (PPy)/Pd ternary composite nanofibers are fabricated through a one-step redox reaction between pyrrole and Na 2 PdCl 4 in the presence of electrospun CoFe 2 O 4 nanofibers in ethylene glycol (EG). The generation of Pd nanoparticles is accompanied by the formation of PPy on the surface of electrospun CoFe 2 O 4 nanofibers during the redox reaction. The as-prepared CoFe 2 O 4 /PPy/Pd composite nanofibers may be used as efficient catalysts for the p -nitrophenol hydrogenation with an apparent rate constant ( k app ) of about 13.2 × 10 −3 s −1 . The CoFe 2 O 4 /PPy/Pd composite nanofibers show good magnetic properties, which can be readily recycled under an external magnetic field.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2013
·
IF 3.41
Qiying Liu,Hualiang Zuo,Tiejun Wang,Longlong Ma,Qi Zhang
Nano-sized SAPO-11s were hydrothermally synthesized with using di-n-propylamine (DPA) as structure-directing agent in mixed n-tetradecanoamine–n-propanol–H 2 O medium and the Ni/SAPO-11 catalysts were prepared by incipient wetness impregnation. The catalysts was characterized by XRD, SEM, BET, H 2 -TPR, NH 3 -TPD and TG techniques and their catalytic performance was tested in hydrodeoxygenation (HDO) of palm oil to hydrocarbon fuels. Surfactant n-tetradecanoamine could mediate the minimum SAPO-11 sizes into 20–50 nm. As comparing to the commercial SAPO-11, the nano-sized SAPO-11s presented significantly enlarged surfaces and mesoporous volumes, which offered sufficient space and strong interactions for dispersing Ni. One-step HDO of palm oil demonstrated that the nano-sized SAPO-1 supported Ni catalysts showed the high yield (80%) of liquid hydrocarbons, high isomerization selectivity (80%) and excellent stability due to that the catalyst presented appropriate acidity, higher Ni dispersity, balance of metal (Ni) and acid (SAPO-11) functionalities and fast diffusion for bulky palm oil and products. These promotion effects observed over the nano-sized SAPO-11 supported Ni catalysts indicated the potential application in biorefinery of vegetable oils to hydrocarbon fuels.
研究领域:
催化化学
·
可再生资源转化
·
能源材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Bin Jiang,Huawei Yang,Luhong Zhang,Rongya Zhang,Yongli Sun,Yong Huang
A series of Brønsted acidic ionic liquids having a protonated amide- or lactam-based cation were synthesized and investigated as extractants and catalysts in the extraction combined with oxidative desulfurization (ECODS) of both model oil and diesel fuel, with hydrogen peroxide (H 2 O 2 , 30 wt%) as oxidant. Each of them showed obvious removal of benzothiophene (BT) and dibenzothiophene (DBT) in model oil. Among them, [HCPL][TFA] exhibited the best performance by completely removing BT and DBT in a short time. The detailed structure and conformation of [HCPL][TFA] were investigated by 1 H NMR and FTIR as well as theoretical calculation. HCPL + cation was verified to exist in an enol form, which was supposed to contribute to high desulfurization performance by improving the formation of peroxides. In the end, two kinds of diesel were used to evaluate its desulfurization performance. [HCPL][TFA] can reduce the S-content of real hydrogenated diesel from 659.7 ppm to 8.62 ppm with 98.69% S-removal efficiency after two ECODS processes. Furthermore, the total S-content of straight-run diesel fuel was reduced to 89.36 ppm from 11,034 ppm with a similar S-removal rate. The results of GC-PFPD before and after each ECODS process indicated that almost all the original S-compounds in diesel had been converted to their corresponding oxidation products. The desulfurization performance was actually restricted by extraction capability.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Materials Au
·
2022
·
IF 0
Qingsong Luo,Hai Wang,Liang Wang,Feng-Shou Xiao
Selective hydrogenation of acetylene to ethylene is an industrially important process to purify the raw ethylene stream for producing high-grade polyethylene. The supported Pd catalyst exhibits superior activity for acetylene hydrogenation but suffers from poor ethylene selectivity because of the easy overhydrogenation to produce ethane. Here, we report that the PdCu alloy nanoparticles within siliceous zeolite crystals effectively tuned Pd-catalyzed overhydrogenation into semihydrogenation. This catalyst displayed an ethylene selectivity of 92.9% with a full conversion of acetylene. Mechanism studies reveal that the zeolite fixation stabilized the alloyed structure, where the electron-enriched Pd surface benefits the rapid ethylene desorption to hinder the deep hydrogenation. This work provides an efficient strategy for a rational design of bimetallic metal catalysts for selective hydrogenations.
研究领域:
催化化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Yanxi Qin,Rongyu Li,Wei Mi,Wei Shi,Baoying Lu,Xili Tong
Aqueous catalytic phenol has been explored using Pd 7 P 3 /SiC catalysts in the presence of H 2 . Palladium phosphide was prepared by oleoamine reduction and supported on silicon carbide. The physicochemical properties of the catalyst were characterized by inductively Coupled Plasma Emission Spectrometer (ICP-MS), X-ray diffractometer (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that palladium phosphide is successfully supported on silicon carbide, and the dispersion is relatively uniform with the particle size is about 6–9 nm. Under the same catalytic conditions, a catalyst with a loading of 2.4 wt% exhibits the best activity. When the temperature is 40 °C, the initial pressure is 5 bar, the conversion of phenol can reach more than 99%, and the selectivity of cyclohexanol reaches 94% after 2 h reaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 1
·015506
·
IF 1.929
Dezhi Wang,Yao Lu,Kangyan Lv,Zhuangzhi Wu
To further improve the electrochemical catalytic performance of MoP for hydrogen generation, a tungsten decoration strategy is proposed in this work, and the effect of preparation temperature was also investigated. It is found that the decoration of W can significantly enhance the electron transfer ability and increase the amount of active sites, and the optimized catalyst can be obtained at 700 °C over the Mo-W-P-700 catalyst, which exhibits the best catalytic performance with a small Tafel slope of 53 mV dec-1. This decoration strategy can be widely applied in other transition metal compounds to achieve further performance improvements.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2020
·
IF 2.304
Li Li,Feifei Xing,Shourong Zhu
Two N 3 O 3 macrocyclic compounds with rigid chromogenic 1,8-dihydroxylenanthraquione and flexible diethylenetriamine/dipropenetriamine (L1 and L2), were synthesized and characterized. L1/L2 can interact with alkaline, alkaline-earth, as well as Zn 2+ , Pb 2+ , and Al 3+ chloride/perchloride evidenced by their DPV change and 1 H NMR spectra. Unexpectedly, both L1 and L2 can show chromogenic response to Na + , K + , and TBA + hydroxide (but not LiOH). Large cavity L2 can show chromic response to Ca(OH) 2 and Ba(OH) 2 , but L1 can only respond to Ca(OH) 2 in DMSO. L1 and L2 form 1:1 and 2:1 (Host:Guest) complex respectively with NaCl, NaOH, TBAOH in DMF/DMSO. Both hosts bind smaller Zn 2+ and Al 3+ in 2:1 in DMSO. L2 can form L2·TBAOH greenish yellow complex that gradually transformed to red L2 2 ·TBAOH in two steps in DMSO. Different from other macrocycles, L1 and L2 are ion-pair hosts that recognize cation and OH − via carbonyl groups.
研究领域:
有机化学
·
分析化学
✓ 已验证
DOI
高影响因子
Research
·
2019
·
IF 0
Cai-Juan Liu,Ning-Ning Zhu,Jian-Gong Ma,Peng Cheng
Xylitol is one of the most famous chemicals known to people as the essential ingredient of chewing gum and as the sugar alternative for diabetics. Catalytic hydrogenation of biomass-derived xylose with H2 to produce high-value xylitol has been carried out under harsh reaction conditions. Herein, we exhibit the combination of Ru NPs with an environmentally benign MOF (ZIF-67) to afford a heterogeneous composite catalyst. Complete conversion of xylose with 100% selectivity to xylitol was achieved at 50°C and 1 atm H2. This is the first successful attempt to produce xylitol with ambient pressure H2 as well as the first time to achieve a 100% selectivity of xylitol for applicable catalysts. We also proved the universality of the Ru@ZIF-67 towards other hydrogenation processes. Under 1 atm H2, we achieved 100% conversion and >99% selectivity of 1-phenylethanol at 50°C for the hydrogenation of acetophenone. This is also the first report of hydrogenating acetophenone to 1-phenylethanol under 1 atm H2, which confirms that our result not only contributes to enhance the industrial yields of xylitol and reduces both the economical and energy costs but also provides new perspectives on the other hydrogenation process with H2.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
Journal of Materiomics
·
2024
·
IF 8.4
Huili Ran,Xue Liu,Jiajie Fan,Yun Yang,Lijie Zhang,Qin Guo,Bicheng Zhu,Quanlong Xu
The construction of heterojunction is an effective way to promote the photoinduced charge carrier separation in spatial, thus accelerating the photocatalytic reaction. However, the regulation of interface properties, as a crucial factor in affecting the charge carrier diffusion process, still remains a significant challenge. In this work, BiOBr/TpBD-COF heterojunction was successfully constructed via a novel phase transformation strategy. Specifically, perovskite Cs 3 Bi 2 Br 9 was first synthesized and then in-situ transformed into BiOBr during the preparation of TpBD-COF procedure, thus obtaining BiOBr/TpBD-COF heterojunction with favorable interface. According to the in-situ X-ray photoelectron spectroscopy (XPS) characterization and electron paramagnetic resonance (EPR) analysis, the photogenerated electrons with weak reduction power transfer from BiOBr to TpBD-COF driven by the internal electric field under irradiation, conforming S-scheme charge transfer mode. As a result, the photogenerated electrons and holes with strong redox abilities are spatially located on TpBD-COF and BiOBr surface, respectively, endowing the strong driving force toward the water splitting reaction. The optimized 10%BiOBr/TpBD-COF displayed remarkably enhanced photocatalytic hydrogen evolution rate (16.17 mmol·g −1 ·h −1 ) in comparison with TpBD-COF (5.18 mmol·g −1 ·h −1 ). This study will provide some novel inspirations for developing efficient COF-based S-scheme heterojunction photocatalysts.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
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