CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.7
Zongying Li,Zihao Su,Hongyan Song,Chunxi Li,Hong Meng,Yingzhou Lu
Boron–nitrogen co-doped carbon materials (BNCM) have demonstrated remarkable potential applications in energy storage, catalysis, and adsorption owing to their unique structure and dual acidic and basic sites, and their efficient preparation is highly demanding. Here, we proposed a facile preparation method of BNCM by ball milling calcium carbide (CaC 2 ), BCl 3 and cyanuric chloride (C 3 N 3 Cl 3 ) at ambient temperature. The structure and composition of the BNCMs were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, Raman spectra, transmission electron microscope, etc ., and their adsorption performance for Congo red (CR) and methylene blue was investigated. The results show that BNCMs are nanosized mesoporous carbon materials with surface area of 385.3 m 2 ·g –1 and C, N and B-content of 74.6%, 6.6% and 2.4% respectively for BNCM-3. Furthermore, the contents of B and N can be regulated by the ratio of BCl 3 and cyanuric chloride to calcium carbide. BNCMs shows excellent adsorption performance for CR, with adsorptivity of 606 mg·g –1 at 2.1 μg·g –1 equilibrium concentration, making it suitable for the deep treatment of dye wastewater. Compared to Langmuir model, the Freundlich model can better describe the isothermal adsorption behavior. The removal rate of CR still remained 94.4% after 5 recycles. This study provides a green method for preparing boron–nitrogen co-doped carbon materials under mild conditions, which is of reference significance for the synthesis of other doped carbon materials.
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DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 18
·7099-7108
·
IF 0
Zhangwei Wang,Peiyi Wu
The role of ionic liquid, 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]), on the phase transition behavior of concentrated PNIPAM solutions was investigated by FTIR spectroscopy in combination with two-dimensional correlation spectroscopy (2Dcos) and the perturbation correlation moving window (PCMW) technique for the first time. At low IL concentrations, the Tp of the PNIPAM solution decreases with increases in the IL concentration, due to the destabilization of the hydrated macromolecule structure via preferential interactions between IL and water molecules. However, at higher IL concentrations, unexpectedly, the phase transition behavior disappears. This has been attributed to the formation of a stable interaction network via intra- and intermolecular hydrogen bonding. Furthermore, two changes can be observed in the ν(C–H) region for the sample with 0.4 mol L−1 [Bmim][BF4]. The first change is related to the phase separation of the PNIPAM solution, while the second step is attributed to an IL–D2O association, which takes part in the globule construction, probably interacting with hydrophilic groups of PNIPAM. Thus, the role of ILs on the phase behavior of PNIPAM is embodied in two opposite aspects, the “destroyer” and the “constructer”.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Che,Yuhao Wu,Xinhua Wang,Haizhen Liu,Mi Yan
The Mg(NH 2 ) 2 -2LiH system is considered as one of the most potential hydrogen storage materials due to its high hydrogen storage capacity (5.6 wt%) and excellent reversible hydrogen adsorption and desorption performance. However, its poor kinetic characteristics of hydrogen absorption and desorption limit its practical application. In this work, Li 3 VO 4 @LiVO 2 was synthesized by a hydrothermal method , and was then introduced into Mg(NH 2 ) 2 -2LiH system to enhance the hydrogen absorption and desorption kinetic characteristics. The results show that the hydrogen storage properties were greatly improved with addition of 10 wt% Li 3 VO 4 @LiVO 2 addition. As for the hydrogen absorption and desorption kinetics, the average hydrogen absorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H sample within 20 min at 200 ℃ increased by 95.2% compared with that of the pristine Li-Mg-N-H sample, and the average hydrogen desorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified sample within 30 min at 180 ℃ increased by 42% compared with that of the pristine sample. The E a of hydrogen desorption decreased from 117.86 kJ/mol to 99.43 kJ/mol, which also indicates that Li 3 VO 4 @LiVO 2 catalyst effectively improved the kinetic performance of hydrogen desorption and desorption of Li-Mg-N-H. Moreover, the hydrogen desorption capacity and hydrogen absorption capacity of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H increased by 18.4% and 13.8% compared with that of the pristine sample. The catalytic mechanism of Li 3 VO 4 @LiVO 2 was discussed based on XRD , XPS and FTIR analysis results.
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高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Li-li Wan,Guo-long Zang,Xin Wang,Le-an Zhou,Tian Li,Qi-xing Zhou
Oxygen reduction reaction (ORR) plays an important role in green energy conversion, although catalysts are necessary for overcoming its sluggish kinetic. Herein, a nanocrystal NiCo 2 O 4 /N-doped graphene composite material showing high ORR electrocatalytic activity is prepared. The resulting NiCo 2 O 4 /N-doped graphene composite (NiCo 2 O 4 -NG/C) combines the advantages of both component materials and shows enhanced ORR electrocatalytic activity (i.e., more positive peak potential and half-wave potential compared with NiCo 2 O 4 ) while having higher diffusion-limited current density values (−5.7 mA cm −2 , 1600 rpm), better tolerance to methanol, and improved stability than 20 wt% Pt/C. NiCo 2 O 4 anchored on N-doped graphene are demonstrated to be nanocrystal with tiny crystalline grain (diameter < 5 nm) and result in large surface area , thereby allowing more active sites to be exposed. Moreover, the potential exposure of high-index planes may be also responsible for the observed high activity of these materials.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
C. Wang,X.Z. Zheng,L. Yue,P.J. Xia,M. Xu,W.B. Dai
The exploration of stable/efficient phosphor for n -UV chip pumped white light-emitting diodes ( w LEDs) remains an arduous task. Herein, a novel series of color tunable Eu 2+ /Tb 3+ /Sm 3+ tridoped Sc-based cyclosilicate phosphors (KBaScSi 3 O 9 : Eu 2+ /Tb 3+ /Sm 3+ ) have successfully designed and obtained via facile solid-state reaction based on comprehensive consideration of rigidly structural network of host, weak electron-phonon coupling strength and spectral adjustability of codopants via energy transfer (ET). The crystallographic occupancies of Eu, Tb and Sm primary in Ba/K, Ba and Ba sites in the monoclinic host, respectively were determined on the basis of the Rietveld refinements and crystal chemistry rules. The photoluminescence (PL) properties were systematically investigated in conjunction with structural analyses, implying that the ‘warm’ white light with excellent thermal stability is stemmed from combination of optimized blue (Eu 2+ ), green (Tb 3+ ) and red (Sm 3+ ) emissions via Eu → Tb → Sm ET strategy. Interestingly, Tb ions play both roles of green light luminescent center and ET bridge to achieve cascade ET for connecting Eu/Sm ion pairs because of the adverse metal-metal charge transfer (MMCT) effect (Eu 2+ + Sm 3+ → Eu 3+ + Sm 2+ ). Furthermore, the phosphor-converted w LEDs (pc- w LEDs), by encapsulating the optimal KBS: 4 %Eu/4 %Tb/6 %Sm with commercial n -UV LED chip, show high thermal stability with satisfactory electroluminescence (EL) performances. These results indicate the KBS: Eu/Tb/Sm phosphors are potential candidates for application in high power n -UV pumped pc- w LEDs.
研究领域:
材料科学
·
发光材料
·
固态照明
·
无机化学
·
光电子学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Chao Zhong,Chunming Wang,Fengxue Wang,Honghua Jia,Ping Wei,Yin Zhao
Cellulose isolation, a promising way for lignocellulosic biomass utilization, is always restricted by the poor solubility of cellulose. In this paper, tetra-n-methylammonium hydroxide (TMAH) was confirmed to be capable of readily dissolving/regenerating cellulose without chemical modification at room temperature. Meanwhile, cellulose isolation from lignocellulosic biomass by initially dissolving the biomass in TMAH followed by cellulose precipitation was proposed, and the isolated substance with average cellulose purity of 92.1 ± 0.3% could be obtained throughout this process under the optimum conditions: temperature 52 °C, time 60 min, and loading ratio of TMAH/biomass ( w / w ) 7.2:1. Besides, high efficiency cellulose isolation (i.e. >70% cellulose purity) could be continuously remained during 4-round cycles by using the recycled TMAH solvent without distinct activity loss.
研究领域:
生物质化学
·
绿色溶剂
·
天然高分子
·
可持续材料
·
生物精炼
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高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2019
·Vol. 57
·期 20
·1386-1393
·
IF 2.596
Alberto García-Peñas,Yu Wang,Alexandra Muñoz-Bonilla,Marta Fernández-García,Florian J. Stadler
The effect of the molecular weight on the lower critical solution temperature (LCST) has been discussed extensively, where LCST increased with molar mass, decreased or kept constant, which leads to confusion. This work is focused on the preparation of poly( N -isopropyl acrylamide) homopolymers, obtained in a wide molecular weights range. The LCST behavior is analyzed by calorimetry and rheology, and a deep study of molecular features is carried out for a better knowledge of the influence of various parameters involved on LCST. Finally, the molecular weight trend is observed, and its influence on LCST is compared with the effect of other parameters as polymer concentration in water, end-group effect, and tacticity. It is observed that other parameters such tacticity and end-group effect will affect the LCST behavior over molecular weight, if this one is not high enough. Furthermore, the study of the LCST ranges will be a useful tool for analyzing the molecular weight trends. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019 , 57 , 1386–1393
研究领域:
高分子科学
·
温敏聚合物
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聚合物物理
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材料化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Qian Wen Bao,Jin Fang Liu,Bin Hong Liu,Zhou Peng Li
Two N-containing hydrocarbon based polymers polyacrylonitrile (PAN) and polyaniline (PANI) were found to be able to destabilize LiBH 4 , a potential hydrogen storage material , resulting in larger hydrogen capacities of more than 10 wt% with peak dehydrogenation temperatures around 344 °C. The results suggest that a co-destabilization effect was achieved through the interaction of B H and C H bonds, which was further enhanced due to the presence of nitrogen atoms in polymers. After rehydrogenation of the dehydrogenated products, LiBH 4 was found to be regenerated to a large extent in both of the LiBH 4 +polymer composites. Detailed analysis including XRD , FTIR , DSC-TG-MS, HRTEM , Raman, XPS and solid-state 11 B MAS NMR was performed to elucidate the dehydrogenation and rehydrogenation mechanisms in these composites. The results provide considerable information about interaction mechanisms among B H, C H, N H and C N bonds and also shed lights on the enhancement of LiBH 4 dehydrogenation and reversibility.
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高影响因子
Journal of Water Process Engineering
·
2026
·
IF 6.7
Haolan Xiao,Weilin Wu,Xinyi Wang,Zezhen Zhang,Liming Xia,Wanyu Chen,Lili Wu
Membrane fouling remains one of the primary obstacles hindering the sustainable development of membrane technology. This study pioneers the controlled growth of PNIPAM hydrogel on TA/Fe 3+ /CA coatings via surface UV photocatalysis, resulting in the fabrication of temperature-responsive PNIPAM@PVDF-Fe/CA membranes featuring thermosensitive PNIPAM hydrogel coatings. The modified membrane's water contact angle decreased from 78° to 36° and achieved complete wetting within 2 s. Water absorption increased from 204 % to 236 %, while separation efficiency improved to 97.8 %. Furthermore, the PNIPAM hydrogel remains in a swollen state at room temperature. When the temperature approaches 32 °C, it undergoes a dramatic volume contraction. This rapid and reversible hydrophilic-hydrophobic transition, accompanied by significant changes in polymer volume, enables the membrane to achieve a high flux recovery rate of 97.29 % during 30–50 °C cyclic cleaning cycles, demonstrating outstanding thermally-induced self-cleaning capability. This study provides a novel approach for constructing hydrogel coatings on membrane surfaces while enabling recycling of modified raw materials, even after multiple cycles of modification, stable modified membranes can still be prepared. The thermosensitive response holds potential for enhancing membrane performance. Combining excellent mechanical properties with recyclability, this membrane demonstrates significant application potential in wastewater treatment.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2026
·
IF 4.4
Supeng Gao,Binbin Wang,Yujie Cheng,Mengyan Feng,Yue Han,Tao Li,Shuguang Cao,Yao Li,Lingwei Xue
An n-type dimeric organic molecule, B2, is employed as an interfacial modifier to regulate the contact property between the perovskite layer and PCBM ETL in inverted PSCs. • B2 interlayer passivates defects in the perovskite layer and optimizes the energy level alignment at the interface. • A prominent PCE of 20.20% is delivered by PSCs with B2 as the interlayer, alongside minimal hysteresis. • The unencapsulated devices retain more than 80% of initial PCE after 1000 h in ambient humid air. Interface engineering at the perovskite/electron transport layer (ETL) junction has been demonstrated as an effective strategy for achieving high-quality interfacial contact in perovskite solar cells (PSCs). In this work, an n-type dimeric organic molecule, B2, is employed as an interfacial modifier to regulate the contact property between the perovskite layer and PCBM ETL. Experimental results reveal that the B2 interlayer passivates defects in the perovskite layer through coordination with undercoordinated Pb 2+ ions, thereby suppressing trap-assisted non-radiative recombination. Furthermore, the B2 modification optimizes the Energy level alignment at the interface, promoting efficient charge carrier transport. As a result of these synergistic effects, the interface-engineered PSCs achieve a power conversion efficiency of 20.20% and maintain over 80% of their initial efficiency after 1056 h of aging tests. This study provides an effective interfacial regulation approach for developing highly efficient and stable PSCs. Download: Download high-res image (136KB) Download: Download full-size image
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Zhuanzhuan Shi,Zuqiang Ma,Liang Liu,Xiaoshuai Wu,Lishan Long,Jiahao Li,Zihan Wang
An electrochemical CAP sensor is constructed by CoNi/N-CNTs synthesized using nickel foam and melamine. • CoNi/N-CNTs features abundant active centers, fast electron transfer and synergistic catalytic efficiency for CAP reduction. • The sensor attains a low detection limit of 67 nM and a wide linear range for CAP detection. • Its Its practical application potential is validated by excellent stability and repeatability. The abuse of chloramphenicol (CAP) can trigger environmental and health issues, making it crucial to establish rapid and sensitive detection methods. Electrochemical sensors have garnered significant attention due to their advantages of simple operation and high sensitivity, with the performance of these sensors hinging on electrode sensing materials. In this study, using nickel foam and melamine as substrates and through appropriate cobalt doping, a cobalt-nickel nitrogen-doped carbon nanotube (CoNi/N-CNTs) composite material was successfully synthesized. Subsequently, a high-performance CAP electrochemical sensor was constructed based on this material. In this sensor, the unique carbon nanotube structure of CoNi/N-CNTs provides abundant adsorption sites for CAP molecules. Meanwhile, its excellent electrical conductivity ensures rapid electron transfer between the electrode material and CAP molecules. Moreover, the uniform dispersion of Co and Ni forms stable electrocatalytic active centers, synergistically facilitating the reduction reaction of CAP. This sensor exhibits two linear ranges of 0.2–12 μM and 12–300 μM, a low detection limit of 67 nM, and a high sensitivity of 35.38 μA·μM·cm −2 in the low concentration range (0.2–12 μM). It also demonstrates outstanding anti-interference ability. Additionally, the sensor shows strong stability, maintaining 99.1% of its initial performance after 14 days and achieving a repeatability of 98.7% in eight independent experiments. This study offers an efficient and reliable method for detecting CAP in the environment, with broad application prospects. Download: Download high-res image (190KB) Download: Download full-size image
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 12
·2014
·
IF 5.1
Bo Yu,Suchang Zou,Tianle Wang,Feng Guo,Weilong Shi,Zhimin Ao
As the growing presence of antibiotic residues in environmental water bodies poses an increasing risk to ecological safety and human health, developing simple and efficient methods for the targeted detection of antibiotics is of particular importance. In this study, we propose a simple method for the one-step hydrothermal synthesis of N, S-co-doped carbon dots (N, S-CDs) using disulfide bonds from discarded badminton shuttlecocks. We investigated the effects of different synthesis temperatures on its performance and confirmed the method’s excellent performance in detecting tetracycline (TC) concentrations, with results demonstrating that varying synthesis temperatures affect the degree and distribution of carbonization, thereby influencing fluorescence intensity. Consequently, employing N, S-CDs-180, which exhibits optimal photoluminescence properties, as the sensing probe for the detection of TC solutions at varying concentrations yielded an excellent linear equation for fluorescence quenching and the detection limit is 1.963 mg/L. Additionally, the fluorescence stability of N,S-CDs-180 was investigated in laboratory water, tap water, seawater, lake water, and industrial wastewater, all of which demonstrated exceptional environmental adaptability. Furthermore, a systematic investigation into the target selectivity of N, S-CDs-180 toward various antibiotics revealed that this material exhibits a sensitive quenching response specifically to tetracycline-class antibiotics while showing no quenching effect on non-tetracycline antibiotics, collectively indicating that the as-prepared N, S-CDs can serve as potential fluorescent probes for the highly selective detection of tetracycline-class antibiotics in complex aqueous systems.
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PubMed
高影响因子
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