ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Jingwen Wang,Yushan Yang,Guoying Sun,Min Zheng,Zhigang Xie
2,4,6-trinitrophenol (TNP) is environmentally deleterious substance that has been of pressing societal concern. Therefore, developing a convenient and reliable platforms for its fast and efficient detection is of paramount importance from security point of view. Herein, amphiphilic fluorescent carbon dots (CDs) were prepared by a simple solvothermal method . CDs exhibit high selectivity and sensitivity on TNP in the polar and apolar solvent and even natural water samples. Moreover, the simple and portable indicator paper can be prepared conveniently and used for sensing TNP visually with high sensitivity and fast response. Research findings obtained from this study would assist in the development of portable devices for the on-site and real-time detection of environmental hazards.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Hai-Min Shen,Gong-Yuan Zhu,Wu-Bin Yu,Hong-Ke Wu,Hong-Bing Ji,Hong-Xin Shi,Yuan-Bin She,Yi-Fan Zheng
Renewable β -cyclodextrin ( β -CD) was grafted onto the surface of silica gel using (3-chloropropyl)trimethoxysilane and ethylenediamine as linking groups to construct adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, contact angle measurement, TGA, solid-state 13 C NMR, SEM, and XRD analyses. The effects of initial pH, contact time on the adsorption performance of CD@Si to p -nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate the adsorption of p -nitrophenol onto CD@Si is a very fast process and the adsorption equilibrium can be reached in 5 s with acceptable equilibrium adsorption capacity of 41.5 mg/g in pH ≥8.5, much faster than many reported adsorbents based on β -CD. The adsorption of p -nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous and exothermic process which is more favorable in lower temperature. And the formation of inclusion complex and hydrogen bond interaction are two origins of p -nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused at least five runs with acceptable adsorption capacity, is a very promising adsorbent in the fast adsorption of p -nitrophenol or its analogues from aqueous phase.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jing Liu,Yuhao Zhou,Zhenxue Xiao,Mengyuan Xue,Sheng Liu,Tianying Yan
Lithium–sulfur (Li–S) batteries, with promising potential for high energy density, remain compelling candidates for next-generation energy storage systems. However, they still suffer from huge challenges such as severe shuttle effects and sluggish redox kinetics. A strategic approach involves the meticulous design of host materials at the molecular level, emphasizing the construction of efficient sulfiphilic organic molecules as anchoring sites for lithium polysulfides (LiPS). In this study, a series of benzamides (benzamide, 2-fluorobenzamide, and 2,6-difluorobenzamide) are introduced onto carboxylic multiwalled carbon nanotubes (C-CNT) to graft sulfur hosting materials with tailored functional interfaces for Li–S batteries. Through a comparative study, we identify the semi-ionic C−F bond and carbonyl functional group as active centers, presenting a synergistic strategy via Li···O and Li···F bonds for anchoring LiPS. The optimized cathode material of sulfur-based carbon nanotubes grafted with 2-fluorobenzamide exhibits outstanding electrochemical activity, achieving a high reversible capacity of 944.8 mAh/g under a high sulfur loading (5.5 mg cm −2 ) and low electrolyte usage (8 µL mg −1 ). Our study underscores the potential of tailoring the molecular structure of host materials to effectively immobilize LiPS for high-performance Li–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2022
·
IF 12.545
Qing Yu Liu,Zhen Qi Bu,Min Xia Quan,Ying Wu,Xuezhi Ding,Li Qiu Xia,Jiao Yang Lu,Wei Tao Huang
Inspired by information processing and communication in nature based on molecular recognition and structural diversity, ongoing efforts aim to development of artificial molecular or nano-systems for sensing, logic computing, and even data storage and safety. However, due to their preparation/functionalization shortcomings (laborious and time-consuming), poor flexibility and compatibility, and limited paradigm, it is still a big challenge whether simple molecules can be used to achieve comprehensive and universal applications from sensing to information storage and protection. Herein, we for the first time demonstrated a molecular paradigm—computer-like “basic input output system (BIOS)” which can realize “plug-and-play” sensing, information encoding, molecular cryptography, and steganography based on a simple artificial molecule (p-nitrophenol, PNP). Based on its molecular recognition and inherent chemical identities, PNP was utilized for colorimetric detection of multiple metal ions (Hg 2+ , Fe 3+ , Al 3+ , Cr 3+ ) and distinguishing their valence (like Cr 3+ /Cr 6+ , Fe 3+ /Fe 2+ ). Interestingly, PNP can achieve the “plug-and-play” fluorescent expansion of detection channels by directly mixing with fluorescent molecules, indicating that PNP molecule can be served as a molecular BIOS with flexibility and compatibility. Impressively, the selectivity embedded in PNP-based BIOS sensing system can be developed as molecular-level double cryptographic steganography to encode, encrypt and hide specific information (like the content of classical literature). This research not only provides a basic idea for building a molecular paradigm with “plug-and-play” flexibility and compatibility, but also provides ideas for the use of molecular sensing and informatization to open up the digitalization of the molecular world.
研究领域:
化学
·
信息科学
·
分子生物学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Xiulun Sun,Xinjie Liu,Rongmei Liu,Xueying Sun,Anran Li,Wen Li
We reported a new and facile synthesis route to prepare polyaniline (PANI) nanowire@Co-Fe LDHs nanosheets in two steps. The PANI@Co-Fe LDHs has excellent OER activity with a small overpotential of 261 mV at the current density of 10 mA·cm −2 and a small Tafel slope of 67.85 mV·dec −1 . The PANI@Co-Fe LDHs also has long-term performance and stability. The excellent electrocatalytic performance of the catalyst depends on the good electrical conductivity of PANI and the effect of the two-dimensional (2D) layered structure of Co-Fe LDHs. The work opens a new application for energy storage and conversion.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Li Wang,Xingwei Li,Gengchao Wang
An electrochemical stable conductive network is built to improve the pseudocapacitance of polyaniline . As a proof-of-concept demonstration, p olyaniline/ITO composite is synthesized by in-situ oxidation polymerization of aniline in the dispersed system of ITO nanoparticles . The electrical conductivity of the optimal polyaniline/ ITO composite is 14.42 S cm −1 , while that of contrast polyaniline is 1.88 S cm −1 . P olyaniline/ ITO coated on the oxidized carbon cloth (polyaniline/ITO@oxidized carbon cloth) displays a specific capacitance of 1505.7 mF cm −2 at a current density of 0.5 mA cm −2 , and the capacitance retention reaches 75% with a growth of the current density from 0.5 to 5 mA cm −2 , while those of polyaniline@oxidized carbon cloth are 847.9 mF cm −2 and 68.3% . It is noteworthy that the capacitance retention of polyaniline/ITO@oxidized carbon cloth symmetrical capacitor is high up to 90.1% after 2000 cycles at a current density of 1 mA cm −2 . Moreover, a high energy density of 31.18 μWh cm −2 is also attained at a power density of 0.35 mW cm −2 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2020
·
IF 4.872
Sijie Wei,Jun Cao,Xinyue Ma,Jie Ping,Chao Zhang,Tan Ke,Yurui Zhang,Yue Tao,Lanzhou Chen
Microalgae have been used for the removal of heavy metals or synthetic organics; however, the simultaneous removal of both types of compounds is always technically difficult. In this study, a green algae , Chlamydomonas reinhardtii , was first used to simultaneously remove hexavalent chromium [Cr(VI)] and o-nitrophenol (ONP), and the balance among biomass, oxidative damage and removal rate was also investigated. The results showed that treatment with Cr(VI) or ONP decreased the photosynthetic and superoxide dismutase activities and increased the production of reactive oxygen species (ROS) and malondialdehyde content. However, combined treatment with Cr(VI) (≤4 mg/L) and ONP (≤15 mg/L) significantly decreased ROS generation and alleviated cell damage in C. reinhardtii . In addition, the removal rates of Cr(VI) and ONP by C. reinhardtii cells significantly increased from 37.4% to 54.9% and from 35.8% to 45.9%, respectively, and the cells could be reused at least four times. Moreover, the increased acidity in the medium and Cr(VI) reductase content in C. reinhardtii caused Cr(VI) to be reduced to Cr(III). The addition of an exogenous antioxidant decreased the removal rates of Cr(VI) and ONP. These results indicated that the presence of Cr(VI) could induce ROS generation in C. reinhardtii and enhance ONP degradation, which consumed ROS, alleviated cell damage, and thus benefited Cr(VI) reduction. As a result, C. reinhardtii could be used as a theoretical candidate for the simultaneous removal of combined Cr(VI) and ONP contamination.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Yijian Wu,Hui Zhang,Baoqing Shentu,Zhixue Weng
Organo-montmorillonite (OMMT) was introduced into SEBS-g-MA toughened poly(phenylene oxide)/polyamide-6 (PPO/PA6) blends simply by melt extrusion. The effects of OMMT on morphology, rheology, and mechanical behaviors of toughened PPO/PA6 nanocomposites were studied by scanning electron microscope, transmission electron microscope, capillary rheometer and mechanical tests. The addition of OMMT could decrease the size of dispersed PPO domains in PA6 matrix and melt viscosity of the toughened PPO/PA6 nanocomposites. Besides, exfoliated OMMT also brought significant improvement of tensile properties and heat deflection temperature (HDT), simultaneously. For nanocomposites with exfoliated OMMT, OMMT induced more core–shell toughening particles with the optimized size, and thus, elastomer-OMMT synergistic toughening was achieved in the PPO/PA6 nanocomposites. Consequently, PPO/PA6 nanocomposites with high tensile strength, excellent impact performance, improved HDT, and good processability were obtained.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2010
·
IF 3.203
Zhou Hong,Chun Zhang,Xuehong Gu,Wanqin Jin,Nanping Xu
In this paper, we proposed a simple method with hydrolysis of silanes to heal nonzeolitic pores of pure silica MFI (silicalite) zeolite membranes. Three silane precursors, tetraethoxysilane (TEOS), tetramethoxysilane (TMOS) and dimethoxydimethylsilane (DMDS) were used for membrane modification at room temperature. The modified membranes were evaluated by the separation of p-/o-xylene mixture. It was found that the hydrolysis of silanes in nonzeolitic pores could obviously improve separation performance of the MFI zeolite membranes. The modification results of nonzeolitic pores were related to the silane precursors with different physical–chemical properties and molecular kinetic diameter. Compared with TEOS and TMOS, DMDS was more suitable as a precursor for healing nonzeolitic pores. For a zeolite membrane after DMDS modification, p-/o-xylene separation factor could be increased from 2.34 to 10.84 while p-xylene flux decreased only about 12.6%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2019
·Vol. 361
·期 13
·3146-3154
·
IF 5.451
Zenan Hu,Yongjian Ai,Lei Liu,Junjie Zhou,Gang Zhang,Hongqi Liu,Xiangyu Liu,Zhibo Liu,Jianshe Hu,Hong-bin Sun,Qionglin Liang
Graphical Control of chemoselectivity is a special challenge for the reduction of nitroarenes bearing one or more unsaturated groups. Here, we report a flower-like Rh/α-FeOOH catalyst for the chemoselective hydrogenation of nitrostyrene to vinylaniline over full conversion, which benefits the new functionalized aminostyrene because the multisubstituted aminostyrenes are usually commercially unavailable. This catalyst does not only show desirable selectivity for the vinylanilines, but also exhibits the inertness to various other reducible groups over wide reaction duration. The catalytic selectivity for the reduction of the nitro group towards vinyl group was investigated by the control experiments and FT-IR analysis. We have found that the abundant hydroxyl groups in the α-FeOOH may contribute to the improvement of catalytic activity and selectivity. Furthermore, the catalyst exhibits excellent stability and keeps its catalytic performance even after 6 cycles.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 12
·1782-1792
·
IF 4.803
Lin Yuemin,Zhang Yuanyuan,Nie Renfeng,Zhou Kai,Ma Yao,Liu Mingjie,Lu Dan,Bao Zongbi,Yang Qiwei,Yang Yiwen,Ren Qilong,Zhang Zhiguo
Ultra-dispersed Ni nanoparticles (7.5 nm) on nitrogen-doped carbon nanoneedles (Ni@NCNs) were prepared by simple pyrolysis of Ni-based metal—organic-framework for selective hydrogenation of halogenated nitrobenzenes to corresponding anilines. Two different crystallization methods (stirring and static) were compared and the optimal pyrolysis temperature was explored. Ni@NCNs were systematically characterized by wide analytical techniques. In the hydrogenation of p -chloronitrobenzene, Ni@NCNs-600 (pyrolyzed at 600 °C) exhibited extraordinarily high performance with 77.9 h −1 catalytic productivity and > 99% p -chloroaniline selectivity at full p -chloronitrobenzene conversion under mild conditions (90 °C, 1.5 MPa H 2 ), showing obvious superiority compared with reported Ni-based catalysts. Notably, the reaction smoothly proceeded at room temperature with full conversion and > 99% selectivity. Moreover, Ni@NCNs-600 afforded good tolerance to various nitroarenes substituted by sensitive groups (halogen, nitrile, keto, carboxylic, etc.), and could be easily recycled by magnetic separation and reused for 5 times without deactivation. The adsorption tests showed that the preferential adsorption of −NO 2 on the catalyst can restrain the dehalogenation of p -chloronitrobenzene, thus achieving high p -chloroaniline selectivity. While the high activity can be attributed to high Ni dispersion, special morphology, and rich pore structure of the catalyst.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
·
IF 2.813
Haipeng Fan,Zhengliang Qi,Dejun Sui,Fei Mao,Rizhi Chen,Jun Huang
Palladium nanoparticles supported on cross-linked polyaniline with bulky phosphorus ligands were developed. These catalysts showed high efficiency in the Suzuki-Miyaura reaction of aryl chlorides and bromides with phenylboronic acids. Aryl chlorides and bromides with functional groups, such as CN, MeO, CHO, MeCO and NO 2 , were converted to the corresponding biphenyls in high yields with catalyst loading. Additionally, the catalysts combined high activity with good reusability; they could be used at least five times for the Suzuki-Miyaura coupling reaction.
研究领域:
催化
·
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）