FUEL
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2022
·
IF 8.035
Zhongqi Ren,Hui Yu,Xiaojia Wu,Weidong Liu,Fan Zhang,Shichao Tian,Zhiyong Zhou
The separation of aromatics and aliphatic hydrocarbons is one of the most challenging and energy consuming operations in the petrochemical industry. In this work, two switchable solvents, 1,8-diazabicyclo[5.4.0]undec-7-ene imidazole ([DBU][Im]) and 1,1,3,3-tetramethylguanidine imidazole ([TMG][Im]), were synthesized and used for phase-change separation of toluene from n-heptane. The structures of these two switchable solvents were analyzed by 1 H Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared (FT-IR) spectroscopy. The miscibility of various components in these two ILs before and after treatment with CO 2 were studied, the results of which indicated that both these two switchable solvents could be utilized to achieve the effective separation of toluene from n-heptane. Among them, [TMG][Im] was preferable to be used at a low toluene content in the initial toluene/n-heptane system through feasibility study. The effects of extraction time, switchable solvent dosage and molar fraction of toluene on separation performance and the reusability were also investigated, demonstrating that [TMG][Im] could be used simply and feasibly for phase-change separating toluene from n-heptane and showed very good reusability and stability. Finally, the mechanism of reversible phase-change extraction process with [TMG][Im] was explored, indicating that the formation of [TMG][ImCO 2 ] could greatly increase the polarity of the switchable solvent, which is conducive to separating toluene and recovering [TMG][Im] by removing CO 2 .
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Bowen Luo,Linxuan Zhou,Zhipeng Tian,Yao He,Riyang Shu
Biochar is a promising support to prepare metal-based catalysts due to its large surface area and special porous structure . This work proposed a novel Ru-based biochar catalyst by using KCl and melamine as templates to produce micro-mesoporous structure and realize N-doping at the same time. The prepared Ru/NMC catalyst showed a good hydrogenolysis performance of cornstalk lignin in supercritical ethanol. A series of catalyst characterizations were carried out to reveal the effects of micro-mesoporous structure and N-doping on the lignin hydrogenolysis. The micro-mesoporous structure led to a large surface area, which favored the dispersion of metal site and facilitated the mass transfer and diffusion during lignin hydrogenolysis, while the N-doping formed abundant edge N atoms, which promoted the interaction and the electron transfer between the loaded Ru and the support. These two crucial factors synergistically improved the lignin hydrogenolysis, with 31.2 wt% monomer yield at the reaction temperature of 260 °C.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Yan Long,Wang Xianjie,Wang Yufei,Li Jian,Liu Qianqian,Zhong Xiang,Chang Yuan,Li Qingchao,Verma Santosh Kumar
Contamination of phenolic compounds has devastating effects on the environment. Therefore, its harmless treatment and recycling have received extensive attention. Herein, a novel method for preparing N-S doped phenolic resin (NSPR) from phenols, N and S groups in semi-coking wastewater, and formaldehyde are developed. The KOH is consequently incorporated into the NSPR through simultaneous carbonization and activation in a single step to produce porous carbon material (NSPC). The as-obtained NSPC exhibits a high specific capacitance of 182 F g−1 at 0.5 A g−1, a high energy density of 9.1 Wh kg−1 at a power density of 0.15 kW kg−1, and remarkable cycling stability in aqueous KOH electrolyte. This outstanding electrochemical performance is attributed to its ultrahigh specific surface area (SSA, 2,523 m2 g−1), enormous total pore volume (Vt, 1.30 cm3 g−1), rational pore structure, and N-S heteroatom self-doping (0.76 at% N and 0.914 at% S), which ensures adequate charge storage, rapid electrolyte ion diffusion, and contributed pseudo-capacitance. This work not only provides a facile method for transforming phenolic wastewater into high-value products but also offers a cost-effective and high-performance porous carbon material for supercapacitors.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Li Du,Xiang Yu Gao,Zhu Li,Guo Yong Wang,Zi Wen,Chun Cheng Yang,Qing Jiang
Metal/carbon-based materials derived from metal-organic frameworks have recently attracted great attention for oxygen reduction reaction (ORR) electrocatalysts , but poor electrical conductivity and insufficient stability owing to granular structures, as well as low production hinder their practical applications. Herein, we design and synthesize Co nanoparticles decorated on N-doped carbon nanonecklaces (Co/N-CNNs) by way of electrospinning and following carbonization . The Co/N-CNNs hybrid exhibits excellent ORR performance with a positive half-wave potential (0.865 V) and a large limiting current density (5.35 mA cm −2 ), even comparable to those of Pt/C. Such superior electrocatalytic properties are attributed to the distinctive necklace-like structure, which supplies high specific surface area, hierarchical porous structure , well-dispersed and covered Co nanoparticles, and hierarchical architecture of N-doped carbon. This work provides an effective strategy to fabricate ORR electrocatalysts with well-designed structure and mass production via electrospinning.
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ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Xiaona Yang,Kun Zhang
Three-dimensional thermoelectric (TE) textiles (TETs) fabricated with TE filaments (TEFs) possess merits over other types such as thickness–direction thermal energy harvesting and excellent conformability with dynamic body curves, revealing the prospect of generating electricity for on-body application. Nonetheless, there is still a lack of a costless but scalable method to automatically and seamlessly produce in-series interconnected p–n segmented TEFs with high TE properties via conventional fiber spinning processes. Here, we developed an alternate wet-spinning strategy to continuously manufacture single-walled carbon nanotube-based p–n segmented TEFs at large scale. The TEF with high electrical conductivity (400–800 S cm–1) displays a low contact resistivity of 189.8 μΩ cm2 between the segments and interelectrode, showing 2 orders of magnitude smaller than that reported in the literature. More importantly, the power factors of p-type and n-type segments are 26.25 and 17.14 μW m–1 K–2, respectively, which are 3 and 4 orders of magnitude higher than those of advanced studies. We finally embroidered it into spacer fabric to fabricate a wearable TET, demonstrating an output power density of 501 nW m–2 at ΔT = 27.7 K. The methodology can inspire the development of fiber-based electronics such as wearable TEs and diodes and so forth.
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TALANTA
·
2022
·
IF 6.556
Jingjing Shu,Wenli Xiong,Ran Zhang,Shanyun Ma,Kaiqiang Zhou,Xuwei Wang,Fen Yan,Da Huang,Jianhua Li,Yuanzi Wu,Jian'an He
In view of the biological significance and micro-heterogeneity of protein glycosylation for human health, specific enrichment of N -glycosylated proteins/peptides from complex biological samples is a prerequisite for the discovery of disease biomarkers and clinical diagnosis. In this work, we propose a “grafting-from” N-glycoprotein enriching method based on the in-situ growth of thermoresponsive polymer brushes from the N -glycosylated site of proteins. The initiator was first attached to the pre-oxidized glycan moieties by hydrazide chemistry , from which the thermoresponsive polymers can be grown to form giant protein-polymer conjugates (PPC). The thermosensitive PPC can be precipitated and separated by raising the temperature to above its lower critical solubility temperature (LCST). Mass spectrometry verified 210 N -glycopeptides corresponding to 136 N-glycoproteins in the rabbit serum. These results demonstrate the capability of the tandem thermoprecipitation strategy to enrich and separate N-glycoprotein/glycopeptide. Due to its simplicity and efficiency specifically, this method holds the potential for identifying biomarkers from biological samples in N -glycoproteome analysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Pengna Wang,Ying Sun,Jie Li,Guanqun Zhu,Xueqin Zhang,Hong Yang,Baoping Lin
Novel monomer TPACz containing carbazole and triphenylamine active groups was synthesized. P(TPACz)/WO 3 coralloid porous electrochromic electrode material were prepared by electropolymerization . The P(TPACz)/WO 3 coralloid porous composite electrode material exhibited independent electrochromic properties in the positive potential range (0−1.7 V) (yellow at neutral state and blue at oxidation state) and negative potential range (−1.8−0 V) with the color of the film changing from yellow to dark blue. At the same time, the electrochemical properties of P(TPACz)/WO 3 composite material ware tested. It is noteworthy that the P(TPACz)/WO 3 coralloid porous electrochromic composite electrode materials exhibit both n-type and p-type doped electrochemical properties . Especially, P(TPACz)/WO 3 exhibit excellent capacitive properties in the n-doped state. According to its GCD curve of P(TPACz)/WO 3 nanocomposite electrode material, the area ratio capacitance is 1.94 mF cm −2 in the positive potential window of 0−0.8 V. And the area ratio capacitance is 33.3 mF cm −2 in the negative potential window of −1.8−0 V. Therefore, the design and effects of the nanocomposite material can broaden application range of electrochromic electrode materials and provide new strategies for energy saving material design.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 30
·14510-14516
·
IF 3.925
Yunxian Zhang,Yongyu Pang,Dong Xia,Guoliang Chai
As a successful alternative to the complex and dangerous anthraquinone process, a simple and safe method for the efficient preparation of hydrogen peroxide is to use the electrochemical two-electron oxygen reduction reaction (2e− ORR) process. Herein, we report a facile approach to achieving metal-free nitrogen-doped carbon material electrocatalysts (N-CMCs) using cheap and easily available raw materials, which also have an excellent electrochemical 2e− ORR catalytic performance and selectivity for hydrogen peroxide (H2O2). The as-fabricated nitrogen-doped carbon material electrocatalysts (named as N-CMC-1 : 5) deliver the high H2O2 selectivity of over 80% in a wide potential range from 0.30 to 0.70 V vs. RHE, where the highest H2O2 selectivity can reach 81.4% at 0.42 V vs. RHE. X-ray photoelectron spectroscopy and electrochemical analyses reveal that the content of pyrrolic-N in the catalysts has a positive effect on the 2e− ORR activity. When the catalyst contains more pyrrolic-N, the catalyst demonstrates a better 2e− ORR performance and H2O2 selectivity in alkaline medium, as well as the long-term stability of the catalyst.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Lin Chen,Xia Jiang,Wenhua Chen,Zhongde Dai,Jianping Wu,Shenggui Ma,Wenju Jiang
N-doped mesoporous carbon has been used as an efficient metal-free catalyst for hydrogen sulfide (H 2 S) removal. Traditional synthesis methods for mesopore usually are expensive, corrosive, not eco-friendly, and less N-functional groups remained, leading to the poor removal efficiency for H 2 S. This study provides a facile and green synthesis of N-doped interconnected mesoporous biochars (HNBCs) designed from waste biomass with the cross-linked lignin self-template removed by H 2 O 2 . Compared with those without H 2 O 2 (NPC), HNBCs exhibited higher mesopores volume and more basic sites, i.e., pyridinic N (PdN), pyrrolic N (PyN), -C O, and π-π*, which worked as the main active sites. As a result, adding H 2 O 2 increased the breakthrough sulfur capacity to 181 mg/g for HNBC prepared from cypress sawdust, which was about 5 times that without H 2 O 2 (37 mg/g). The desulfurization and regeneration performance were highly related to the cross-linked mesoporous structure and basic sites on the HNBC. This self-template removing method could easily extend to other waste biomass containing lignin and provide an insight into the advantages of efficient biomass self-structure utilization in the biochar designed properly.
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CARBON
·
2022
·
IF 11.307
Yuxin Bi,Mingliang Ma,Zhengguo Jiao,Yong Ma,Dongshuai Hou,Guoying Geng,Wenxuan Feng,Aijie Ma,Mingtao Qiao,Yanyan Liu
Electrospinning is one of the attractive technologies for fabrication carbon-based fibers due to its high efficiency, component controllability and functionalities. Here, a multi-step strategy was used for the efficient synthesis of one-dimensional (1D) MOF-derived C@Co/N-doped carbon@polypyrrole (C@Co/NC@PPy) composite fibers . The composite fibers synthesized by introducing the electrospinning method possessed unique structural anisotropy and multiple absorption mechanisms. The electromagnetic parameters , the absorption performance and the internal mechanisms of samples were thoroughly illustrated. By adjusting the filler loadings of samples, the electromagnetic wave (EMW) absorption could be optimized. The C@Co/NC@PPy with 35 wt% filler loading showed the optimal performance. Impressively, with a thickness of merely 1.65 mm, the C@Co/NC@PPy composite fibers delivered high performance with the minimum reflection loss (RL min ) of -72.14 dB. Correspondingly, the maximum effective absorption bandwidth (EAB max ) could reach 5.6 GHz with the thickness of 1.88 mm. Furthermore, the 35 wt% loading C@Co/NC@PPy composite fibers could reach 14.28 GHz (89.25% of 2–18 GHz) effective absorption, showing the ultrawide absorption. Those positive results forcefully verified that the 1D MOF-derived C@Co/NC@PPy composites showed great potential and superiority as EMW absorption material .
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Water
·
2022
·Vol. 14
·期 14
·2248
·
IF 3.53
Guowei Pang,Min Ji,Zhuoran Li,Zhengwu Yang,Xiaojie Qiu,Yingxin Zhao
In this work, an efficient cage-core peroxymonosulfate (PMS) catalyst was synthesized by applying an electrospinning–calcination process to the cobalt–zeolitic imidazole framework (ZIF-67) crystals for the catalytic degradation of dimethyl phthalate (DMP). The morphology and surface properties of the synthesized materials (ZIF-67, Z600 and ZP400/600/800) were well characterized. ZP600 showed great performance for the catalytic degradation of DMP in the initial pH range of 7.5–10.5. The removal rate of DMP could reach 90.4% in 60 min under optimum dosages of reagents (catalyst = 0.1 g/L, PMS = 0.5 mM, DMP = 6 ppm), and the mineralization degree of contaminant could reach 65%. By quenching experiments, it was determined that sulfate radical (SO4−·) and hydroxyl radical (·OH) dominated the degradation process. Moreover, due to the good magnetism, ZP600 could be easily separated from liquid and showed great reusability in five-cycle reaction experiments. Surprisingly, with the cover of cage-like polyacrylonitrile (PAN) fibers, the cobalt leaching amount of ZP600 decreased by about 87%. This study would expand the application of the electrospinning process in the development of functional materials for water purification.Keywords:elctrospinning;ZIF-67;peroxymonosulfate;cobalt leaching control
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LUMINESCENCE
·
2022
·Vol. 37
·期 8
·1267-1274
·
IF 2.613
Qi Wang,Bin Zhu,Yejiao Han,Xin Yang,Yanan Xu,Ying Cheng,Taotao Liu,Jiana Wu,Shengling Li,Lifeng Ding,Jingjing Bai,Yulan Niu
In this work, carbon dots (CDs) was easily synthesized from aspartic acid through a pyrolysis method. Based on their favourable fluorescence properties, CDs were utilized to design a metal ion-mediated fluorescent probe for N -acetyl- l -cysteine (NAC) detection. The fluorescence intensity of CDs was firstly quenched by manganese ions (Mn 2+ ) through static quenching effect and subsequently restored by NAC via the combination with Mn 2+ due to the coordination effect. Therefore, the fluorescent turn-on sensing of NAC was actuated based on the fluorescence quenching stimulated by Mn 2+ and recovery induced by coordination. The fluorescence recovery efficiencies showed a proportional range to the concentration of NAC in the range 0.04–5 mmol L −1 and the detection limit was 0.03 mmol L −1 . Furthermore, this metal ion-mediated fluorescent nanoprobe was applied to human urine sample detection and the standard recovery rates were located in the range 97.62–102.34%. This was the first time that Mn 2+ was used to construct a fluorescent nanoprobe for NAC. Compared with other heavy metal ions, Mn 2+ with good biosecurity prevented the risk of application, which made the nanoprobe green and biopractical. The facile synthesis of CDs and novel metal ion-mediated sensing mode made it a promising method for pharmaceutical analysis.
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