PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
·
2024
·Vol. 23
·期 4
·651-664
·
IF 2.7
Wu Zhiwen,Xie Zongbo,Zhu Ye’an,Wang Bo,Nie Yidan,Qiu Jialin,Le Zhanggao
Manufacturing high-performance and reusable materials from radioactive uranium-containing wastewater remains a significant challenge. Herein, a supramolecular self-assembly strategy was proposed, using melamine and cyanuric acid as precursors and using intermolecular hydrogen bond force to form carbon nitride (CN–D) in different solvents through a single thermal polymerization strategy. Supramolecular self-assembly method is a promising strategy to synthesize a novel carbon nitride with molecular regulatory properties. In addition, 98% of U(VI) in wastewater can be removed by using CN–D for 60 min under visible light. After five cycles of recycling, more than 95% of U(VI) can still be reduced, indicating that it has good recyclability and reusability. This study not only provides an efficient photocatalytic method of uranium reduction, but also provides a new method for self-assembly synthesis.
研究领域:
环境科学
·
材料科学
·
核化学
·
光催化
✓ 已验证
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2019
·Vol. 26
·期 3
·1009-1017
·
IF 2.135
Xinyu Wang,Thomas Andritsch,George Chen,Suvi Virtanen
In nanocomposites, different surface states of nanoparticles can potentially provide different interactions with the base polymer and in turn change the bulk properties. Aluminium nitride (AlN) nanoparticles were surface functionalised with three different silane coupling agents (SCAs) with varying organofunctional and hydrolysable groups. The effects of the filler surface chemistry on the resulting AlN/polypropylene (PP) nanocomposites were examined and compared with an unfilled reference system. It is observed that different organofunctional groups can provide different nucleating effects and the dispersion states of nanoparticles while the hydrolysable group is not the dominant factor. The dielectric spectroscopy results show the hydrolysable group of SCA will also result in a difference of the interphase since the trimethoxy silane treated systems show much higher imaginary permittivity than the triethoxy silane treated systems when the frequency is below 1 Hz. The grafted organofunctional layer on the particle surface can provide a significant improvement of the thermal conductivity of the composite materials, e.g. 15 % improvement in thermal conductivity was observed when adding 10 wt% methacrylate silanes treated nano-AlN into PP, while the untreated counterpart only has 5 % improvement.
研究领域:
高分子化学
·
材料科学
·
纳米技术
·
电介质物理
·
热传导材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 21
·期 1
·1-13
·
IF 2.019
Li Xing-Jian,Sun Dao-Xing,Zhang Yi-Heng
The Cu(I)-mediated azide–alkyne cycloaddition reaction, “click” chemistry, has been used to functionalize the waterborne polyurethane, by which a novel fluorinated waterborne polyurethane (FWPU) was synthesized. FWPU was confirmed by FT-IR and 1 H NMR. The structure and properties of FWPU were characterized by water contact angle, water absorption, surface energy, scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometry (EDS), thermogravimetric analysis (TGA) and X-ray diffraction (XRD), etc. From the research of the surface properties, it was found that the modified materials were endowed with a remarkable hydrophobicity and stain resistance. SEM results showed that the micro-phase separation of FWPU became increasingly apparent with the rise of fluorinated side chains in polyurethane backbone. XRD measurements reflected that the crystallinity of FWPU tended to decrease firstly and then increase with the change of fluorine content. TGA results demonstrated that FWPU possessed flame retardant performance to a certain extent due to the incorporated alkyne groups in the FWPU to improve the final char strongly.
研究领域:
高分子化学
·
材料科学
·
表面工程
·
有机化学
·
应用化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 7
·3482-3489
·
IF 2.2
Yao Weilin,Zhou Yan,Shi Juntao,Chen Zihang,Wang Moxi,Huang Gangyong,Yao Zhujun
TiNb 2 O 7 (TNO) shows high stability and safety, positioning it as a promising candidate for the development of anodes in lithium-ion batteries. Nevertheless, its large-scale application is limited by the sluggish ion and electron transport kinetics within the bulk material. To address this issue, a powerful integrated electrode design is employed to grow TNO nanoparticles on carbon nanotube (CNT) arrays to form NS-C/N-TNO/CNTs. Moreover, biphasic doping including N doping in TNO and N/S codoping in carbon coating on the surface of TNO can be simultaneously achieved via the thermal decomposition of thiourea. Benefiting from the CNT arrays and biphasic doping, the composite possesses enhanced electrical conductivity both outside and inside TNO. Under the influence of the comprehensive advantages mentioned above, the NS-C/N-TNO/CNT composite demonstrates exceptional high-rate performance (352 mA h g −1 at 1 C and 142 mA h g −1 at 30 C).
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
表面工程
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 8
·1919-1929
·
IF 1.915
Zheng Kai,Chen Jianan,Gao Xue,Cao Xiaoqing,Wu Shan,Su Jixin
Photocatalysis has been regarded as a kind of environmentally friendly advanced oxidation process to eliminate pollutants. In this work, Phosphorus-doped carbon nitride tube (PCN) was synthesized via a hydrothermal calcination method and applied to degrade tetracycline (TC) through combing with peroxydisulfate (PDS) under visible light irradiation. Experimental results showed that the optimized catalysts PCN-5 exhibited superior degradation performance and reusability for TC degradation. 96.4% TC could be degraded for optimal PCN-5 with 0.3 g·L −1 catalysts and 1.0 g·L −1 PDS under visible light within 60 min. In addition, the degradation rate constant for TC of PCN + PDS + Vis system was still above 85% after five uses. Radical trapping experiment indicating that O 2 · − is the dominant radical for TC degradation. The findings of this work revealed the potential application of the PCN + PDS + Vis system toward degrading contaminants in wastewater. Phosphorus-doped carbon nitride tube was successfully synthesized. PCN-5 + PDS + Vis system exhibited excellent TC degradation performance and reusability. O 2 · − is the dominant radical for TC degradation.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 29
·11065-11072
·
IF 0
Qian Zhang,Ying Zhou,Fang Wang,Fan Dong,Wei Li,Haimin Li,Greta R. Patzke
Elemental photocatalysts have recently been proposed as interesting materials to be used as alternatives to conventional semiconductor compounds. In this study, we demonstrate that not only elements with semiconducting properties are photocatalytically active by introducing semimetallic bismuth for the photooxidation of NO. Black Bi films were prepared via an electrochemical deposition approach. Both density functional theory (DFT) calculations and temperature dependence electrical resistivity measurements pointed out that the obtained films exhibited semimetallic behavior. The Bi films were easily oxidized upon exposure to air. However, electrochemical reduction of the surface amorphous oxide layer led to a more than 4-fold enhancement of the photocurrent density of the Bi films. The detection of hydroxyl radicals with electron spin resonance (ESR) investigations further confirmed the photogeneration of electrons and holes. A 37.7% removal ratio of NO over Bi films was observed under UV light irradiation with no significant reduction of photocatalytic activity after five cycles. Given that the conduction and valence bands of semimetallic Bi overlap, the associated excitation processes are more complex in comparison with semiconductor photocatalysts, thereby indicating a different photocatalytic mechanism. The present study points out new directions for developing semimetallic photocatalysts.
研究领域:
材料科学
·
环境催化
·
物理化学
·
表面科学
·
无机功能材料
✓ 已验证
DOI
Science Advances
·
2022
·Vol. 8
·期 10
·
IF 14.957
Huan Yu,Yinxiang Zeng,Nian Wu Li,Deyan Luan,Le Yu,Xiong Wen (David) Lou
We developed a three-dimensional hybrid fiber host consisting of interconnected N-doped hollow carbon spheres embedded with Sn nanoparticles (denoted as Sn@NHCF) for Zn metal anodes in high-performance Zn metal batteries. Experimental observations and density functional theory calculation reveal that the zincophilic Sn nanoparticles and N-doped carbons enable the homogeneous Zn deposition on the interior and exterior surfaces of the hollow fibers. Moreover, the hierarchical hollow fiber network effectively reduces the structural stress during the plating/stripping process. As a result, the developed Sn@NHCF host exhibits remarkable electrochemical properties in terms of high Coulombic efficiency, low voltage hysteresis, and prolonged cycling stability without dendrite formation. Moreover, a full cell based on the designed Sn@NHCF-Zn composite anode and a V2O5 cathode demonstrates superior rate capability and stable cycle life. This work provides a new strategy for the design of dendrite-free Zn anodes for practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Mingli Zhang,Hengcong Tao,Yongchao Liu,Chao Yan,Song Hong,Justus Masa,Alex W. Robertson,Shizhen Liu,Jieshan Qiu,Zhenyu Sun
Development of naturally abundant, low cost, and energy-efficient electrocatalysts for the oxygen reduction reaction (ORR) is essential for commercialization of fuel cells. In this work, we report simple ultrasonication assisted synthesis of nitrogen and boron dual-doped graphene oxide (NB/GO) and demonstrate its application as an effective ORR catalyst realizing predominantly 4e– reduction of O2 to OH– in 0.1 M KOH. Enhanced ORR electrocatalysis of the dual B and N codoped GO as opposed to GO singly doped with B or N arises from the synergistic interaction of the boron and nitrogen species. The content and configuration of both N and B dopants can be readily tailored by controlling the ultrasonic conditions, thereby permitting tuning of the ORR activity. Furthermore, the developed NB/GO metal-free catalyst exhibited very promising long-term durability and resistance to methanol poisoning compared to the state-of the art Pt/C catalyst.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 8
·6451-6460
·
IF 3.442
Zhang Yixin,Liu Lei,Zhang Lili,Yu Yifeng,Lv Haijun,Chen Aibing
Carbon nanotube (CNT) has been intensively studied as supercapacitor electrode materials due to their high mechanical strength and excellent electrical conductivity. However, CNT with limited accessible surface area has low specific capacitance, which limits its application and development in supercapacitor. Herein, we have designed a thin N-doped porous carbon layer-modified CNT nanocomposite by template-free method. In this process, 3-aminophenol and formaldehyde rapidly self-assemble on the CNT in the presence of cationic surfactant CTAB, forming the composite of 3-aminophenol/formaldehyde (3-AF) resin and CNT. Due to the different polymerization degree of inside 3-AF resin, the soluble 3-AF resin oligomer was removed by acetone to form porous 3-AF resin and CNT@N-doped porous carbon (CNT@N-PC) was obtained by annealing process. The CNT@N-PC exhibited abundant porous structure, high specific surface area of 940 m 2 g −1 , excellent specific capacitance value of 224 F g −1 at 1 A g −1 and good cycle stability, demonstrating its potential as supercapacitor electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Jingmiao Hu,Yunjian Fan,Shijian Li,Jian Kang,Shan Chen,Huajie Yin,Huijun Zhao
Photocatalytic reforming (PR) of polyester waste, fueled by renewable sources like solar energy, offers a sustainable method for producing clean H 2 and valuable by-products under mild conditions. The design of high-performance photocatalyst plays a pivotal role in determining the efficacy of an alkaline polyester PR system, influencing H 2 generation activity and selectivity. Here, ultrathin porous carbon nitride nanosheets (UP-CN) loaded with Pt nanoclusters (Pt NCs, average diameter of 1.7 nm) with uniform Pt NCs distribution are introduced. The resulting Pt NCs/UP-CN catalyst can accelerate charge and mass transfer while providing additional active sites, achieving superior H 2 generation rates of 11.69 mmol g cat −1 h −1 and 2923 mmol g Pt −1 h −1 under AM 1.5 light, which nine times higher than that of Pt nanoparticles-bulk graphitic carbon nitride composite (1.29 mmol g cat −1 h −1 and 258 mmol g Pt −1 h −1 ) as counterpart. This performance also surpasses that of previously reported carbon nitride-based and TiO 2 -based photocatalysts. Moreover, the density functional theory calculations reveal a significant reduction in the energy barrier for the water dissociation step (H 2 O + * → *H + OH) at the interface between UP-CN and anchored Pt NCs, showcasing the synergistic effect between Pt NCs and UP-CN. This catalytic system also exhibits universality across various polyester plastics.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Baofang Zhang,Renlian Chen,Zefan Yang,Yingxin Chen,Lihua Zhou,Yong Yuan
Developing efficient and cheap electrocatalysts as substitutes for commercial Pt/C in the oxygen reduction reaction(ORR)is extremely necessary. Herein, paper mill sludge (PMS) was utilized to produce iron, nitrogen and sulfur co-doped carbon nanotube/nanoporous carbon nanocomposite (PMS-CNT/C) by pyrolysis . PMS-CNT/C-b, one of as-prepared PMS-CNT/C exhibited excellent oxygen reduction reaction activity with an onset potential of 0.99 V vs. RHE and half-wave potential of 0.77 V vs. RHE, which was similar to the commercial Pt/C catalyst (onset potential of 0.99 V vs. RHE and half-wave potential of 0.76 V vs. RHE). It had longer-term stability and higher methanol tolerance in alkaline medium than Pt/C. Moreover, the new catalyst also exhibited excellent catalytic performance in neutral solution. The energy output of microbial fuel cells loaded with PMS-CNT/C-b catalyst was also higher than that of commercial Pt/C under neutral condition. The excellent ORR performance of PMS-CNT/C-b was due to the carbon nanotube/nanoporous structure and the synergistic effect of abundant N groups, iron nitrides and thiophene-S. The formation of CNTs in the carbon nanotube/nanoporous carbon nanocomposite was mainly attributed to melamine , which was added into PMS and was at first just considered as a nitrogen source to develop N-doped PMS-based catalysis in this work. The synthesis of paper mill sludge-based carbon nanotube/nanoporous nanocomposite and its excellent ORR activity will make the new catalyst a promising cathodic electrocatalyst alternative for fuel cells.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Liu Yang,Jiachen Guo,Ling Zhang,Chunzhong Li
The rapid development of integrated circuits and micro-devices has brought serious thermal failure and huge fire hazards to polymer composites due to the inefficient heat dissipation. Here, in order to simultaneously achieve the excellent thermal conductivity (TC) and flame retardancy (FR) of composites, we proposed a strategy of grafting a flame retardant on the surface of an exfoliated boron nitride nanosheet (BNNS). Briefly, the atom transfer radical polymerization (ATRP) reaction was initiated on the surface of the BNNS with predeposited polydopamine to obtain poly(glycidyl methacrylate) (PGMA) chain with high graft density, and then the flame-retardant molecule 6H-dibenz(C,E)(1,2)oxaphosphorin-6-oxide (DOPO) was further decorated to form a flame-retardant functionalized BNNS with branched structure. Due to the improvement of interfacial compatibility, the BNNS exhibits uniform dispersion and robust interfacial interaction with the epoxy resin (EP), which will further promote the formation of heat conduction paths and the reduction of interfacial thermal resistance (Rb). In particular, the EP composite containing 30 wt % BNNS-DOPO exhibits a TC of 1.25 W/m·K, exceeding that of the composite loaded with serious aggregated BNNS by 32%. Simultaneously, the EP composite with only 20 wt % BNNS-DOPO presents a superior FR with an obvious decrease in the values of peak heat release rate (PHRR), total heat release (THR), smoke production rate (SPR), and total smoke production (TSP) compared to EP, corresponding to a reduction of 47.6, 44.7, 46.5, and 50%, respectively. The enhanced FR is mainly ascribed to the catalytic carbonization of DOPO, and the continuous and compact protective layer formed by the char combined with the BNNS effectively prevents the exchange of heat, oxygen, and volatile gases. Therefore, this surface modification strategy of the BNNS provides a new idea for exploring thermally conductive and flame-retardant composites.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）