JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Bin Zhao,Ningzhao Shang,Shutao Gao,Chun Wang
N -decorated porous carbon (NDC) was obtained by one step direct pyrolysis of NH 2 -MIL-125. The content of nitrogen in the NDC-1000 (2 h) was 4.2%. Palladium nanoparticle was deposited on the NDC by an impregnation strategy. The NDC-1000-Pd catalyst was characterized by powder X-ray diffraction, TEM, XPS and N 2 adsorption. Due to the synergetic interaction of metal species and NDC, the catalyst exhibited excellent catalytic performance for Heck coupling and Suzuki-Miyaura reactions. The catalyst can be reused for five cycles without obvious change in its activity.
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MOLECULES
·
2023
·Vol. 29
·期 1
·146
·
IF 4.6
Zitao Yang,Cunhao Luo,Ning Wang,Junshao Liu,Menglong Zhang,Jing Xu,Yongnan Zhao
The high power density and long cyclic stability of N-doped carbon make it an attractive material for supercapacitor electrodes. Nevertheless, its low energy density limits its practical application. To solve the above issues, Fe2O3embedded in N-doped porous carbon (Fe2O3/N-PC) was designed by pyrolyzing Hemin/activated carbon (Hemin/AC) composites. A porous structure allows rapid diffusion of electrons and ions during charge–discharge due to its large surface area and conductive channels. The redox reactions of Fe2O3particles and N heteroatoms contribute to pseudocapacitance, which greatly enhances the supercapacitive performance. Fe2O3/N-PC showed a superior capacitance of 290.3 F g−1at 1 A g−1with 93.1% capacity retention after 10,000 charge–discharge cycles. Eventually, a high energy density of 37.6 Wh kg−1at a power density of 1.6 kW kg−1could be delivered with a solid symmetric device.Keywords:Hemin/AC;Fe2O3/N-PC;pseudocapacitance;quasi-solid-state supercapacitor
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Biomass Conversion and Biorefinery
·
2023
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IF 4
Zhang Xian,Liu Ze,Khan Hafiz Ihsan Ul haq,Barati Bahram,Parakhonskiy Bogdan,Skirtach Andre G.,Rousseau Diederik P. L.,Van Hulle Stijn
Nitrogen source–modified biochar was produced from rice straw–derived biochar (RSBC) via pyrolysis carbonization using nitrogen sources such as ammonium chloride, dicyandiamide, melamine, thiourea, and urea. The characteristics of the resulting biochars were compared, including their elemental compositions, surface functional groups, and morphology. The N-modified biochar contained N- and O-based groups (N–H, C–N, C≡N, O–H, and C–O), primarily consisted of mesopores (3.01 ~ 14.42 nm pore diameter), and had a specific surface area ranging from 95.87 to 167.86 m2 g −1 . The N-modified biochar’s BPA adsorption capacity was correlated to the activation temperature (correlation coefficient n = 0.5), with adsorption capacities varying from 7.43 to 63.09 mg g −1 . Ammonium chloride–modified biochar synthesized at 800 °C had over twice the BPA adsorption capacity of pristine biochar (28.80 mg g −1 ) among various nitrogen sources evaluated. The pseudo-second-order model characterized the adsorption kinetics of BPA, while the Freundlich model faithfully captured its isotherms. This study emphasizes the significance of proper nitrogen source selection and optimal modification temperatures to enhance the BPA adsorption capacity of biochar. Graphical Abstract
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INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Qi Gao,Yuyu He,Liangmeng Ni,Hao Ren,Mengfu Su,Shaowen Rong,Zhijia Liu
Fe-N-modified activated carbons (ACs) were prepared from bamboo shoot shells (BSS) by potassium ferrate activation for arsenic adsorption. BSS provided abundant nitrogen and carbon sources for ACs, while potassium ferrate significantly improved the pore volume and specific surface area (SSA), but also loaded iron particles. The highest SSA of AC was 1900 m 2 /g, with the iron content of 4.54–6.52% and nitrogen content of 2.88–3.35%. Based on the arsenic adsorption capacity, the optimized manufacturing process was activation temperature of 800 °C, activation time of 120 min, and activator ratio of 3.5. The optimized AC exhibited excellent arsenic adsorption performance and the maximum adsorption capacity was 9.18 mg/g. The good magnetism of AC was beneficial to recovery and reuse. The adsorption capability retention was still more than 50% after reusing for five times. This work showed that BSS had great potential for commercial development, and also provided a cost-effective production way for arsenic adsorbents.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Shuchun Li,Xuefei Zhang,Xiaoyan Huang,Shuchang Wu,Zailai Xie
Developing highly active and stable nanocarbon catalysts for selective oxidation reactions has attracted much attention due to their potential as an alternative to traditional metal-based or noble metal catalysts. However, the nature of active sites and the reaction mechanism of nanocarbon catalysts for oxidation reactions still remains largely unknown, which hinders the rational design and development of highly efficient carbon-based catalysts. Here we report a facile strategy for the synthesis of boron and nitrogen co-doped carbon nanosheet material (BNC), which exhibits excellent catalytic activity with 91% conversion and 99% selectivity in selective oxidation of benzyl alcohol into benzaldehyde, superior to those of traditional carbon materials (oxidized carbon nanotubes, graphites and commercial nanocarbons). Structural characterizations and kinetic measurements are studied to clarify the active site, in which phenolic hydroxyl on BNC is responsible for the production of benzaldehyde. Meanwhile, we put forward a possible reaction mechanism and point out the key factors in determining the reactivity for this reaction. Therefore, the present work provides new insight into structure–function relationships, paving the way for the development of highly efficient nanocarbon catalysts.
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Science China-Chemistry
·
2022
·Vol. 65
·期 8
·1661-1669
·
IF 10.138
Pu Chun,Li Rui-Dong,Chang Gang-Gang,Chen Min-Jie,Yao Yao,Li Jun-Sheng,Zhao Bo,Wu Lu,Zhang Yue-Xing,Yang Xiao-Yu
Carbon supported metal catalysts have received considerable interest due to their widespread applications in heterogeneous catalysis. However, the controllable synthesis of carbon support with defined morphology and composition still represents great challenging. Herein, we reported the synthesis of a well-defined hierarchically nanosized H-ZrO 2 /NC (nitrogen-doped carbon) network via an inheritable carbonization strategy. When immobilizing the palladium clusters into the support, the N-doped sites and oxygen vacancy of the carbon composite can effectively stabilize and activate Pd through strong metal-support interaction which was also confirmed by density functional theory (DFT) calculations. Moreover, the hierarchically nanosized network can contribute to the exposure of active sites and facilitate the mass transfer during the catalytic process. As a result, benefiting from the hierarchical structure, composition and hydrolytic nature, Pd@H-ZrO 2 /NC exhibited excellent catalytic activity and stability towards the hydrogenation of furfural in mild reaction conditions, as well as good universality toward the hydrogenation of a series of unsaturated hydrocarbons.
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Nano Energy
·
2026
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IF 16.7
Nan Shi,Jianyao Xu,Xiaofang Shi,Yarong Lan,Peiyi Wu,Zhiguo Hu
Novel anti-swelling ionic liquid hydrogel was prepared via a pioneering one-pot hydrophobic crosslinked strategy. • The material strikes a synergistic balance among mechanical toughness, ionic conductivity, freeze resistance and thermoelectric performance. • The high thermoelectric Property and the internal selective regulation mechanism was systematically revealed. Ionic thermoelectric cells (i-TECs) can convert low-grade heat into electricity, but achieving stable performance across wide temperatures range with high thermopower and good mechanical durability remains difficult. This study presents a hydrophobic crosslinking strategy to fabricate fatigue-resistant hydrogel P(NAGA-co-VEIMBr) (PNVC) in one step. The hydrophobic macromolecular crosslinker imparts strong anti-swelling for importing thermoelectric ions. PNVC-based i-TECs show high thermoelectric performance, reversible elasticity, and excellent freeze resistance, allowing stable operation from −20 to 60 °C. The optimized PNVC i-TEC device achieves a thermopower of −10.86 mV K⁻¹ above 0 °C and −4.52 mV K⁻¹ subzero, along with a Young’s modulus of 0.21 MPa. A six-unit array can power an LED by harvesting body heat. PNVC i-TECs also enable self-powered multimodal sensing through small changes in resistance, voltage, or current, demonstrating its exceptional capability for self-powered sensing integrated applications. This hydrophobic crosslinking strategy offers a promising solution for facilely fabricate high performance ionic i-TE materials. Download: Download high-res image (164KB) Download: Download full-size image Table of contents entry An anti-fatigue, freeze-resistant hydrogel ionic thermoelectric cell is fabricated using a hydrophobic crosslinking strategy. It shows high thermoelectric performance, reversible elasticity, and excellent self-healing performance, allowing stable operation over a wide temperature range. These features make it a top-performing i-TEC. The simple fabrication method provides valuable insights for developing high-performance, multifunctional thermoelectric cells.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xiaoyan Xu,Qihong Lu,Jiawei Wu,Wei Mo,Lei Zuo,Ning Yang,Weiwei Xia,Xianghua Zeng
To improve CdS photocatalytic activity , both Cu x Cd 1- x S nanorods and Cu 2 S@CdS p-n heterostructures have been prepared with a simple solvothermal method . The results showed that the maximum H 2 generation rate is equal to 10 mmol h −1 g −1 and 12.1 mmol h −1 g −1 for samples 0.3-Cu 2 S@CdS and Cu 0.1 Cd 0.9 S, respectively, which are nearly 9 and 12 times larger than that of CdS (1.2 mmol h −1 g −1 ) without using Pt as the co-catalyst. The measurements of the light absorption revealed that the samples Cu 2 S@CdS p-n heterostructures and Cu x Cd 1- x S nanorods have an increased visible light absorption. Band structure revealed that Cu 2 S@CdS p-n composite is a type-II heterostructure, which facilitates the separation of photoexcited charge carriers . Furthermore, as the Cu-doping CdS introduced a defect level , which induced the increase of carrier density, and the defect energy level in Cu 0.1 Cd 0.9 S and the band energy in CdS form a type-II heterostructure. Due to the appropriate band structure and stronger light absorption, Cu 2 S@CdS p-n heterostructures and Cu + -doping CdS demonstrated an improved photocatalytic activity and stability.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 45
·21024-21032
·
IF 3.3
Weilin Shen,Dawson Wai-Shun Suen,Eric Tung-Po Sze,Xiao Chen,Changhai Liang,Chi-Wing Tsang
The water splitting reaction has the potential to be a sustainable and environmentally friendly way of producing hydrogen as a fuel source, which is an important step in reducing our reliance on fossil fuels and mitigating climate change. Currently, most commonly used catalysts for water splitting are based on precious metals such as platinum and iridium, which are expensive and scarce. Therefore, finding new catalysts that are low-cost, abundant and efficient is of great importance for making water splitting economically viable on a large scale. It was found that pairing up Co nanoparticles (NPs) with MoCx boosted the hydrogen evolution reaction (HER) activity by more than 2-fold (η10 = 130 mV, Tafel slope = 156.08 mV dec−1), compared with the pure Co NPs supported on N-doped carbon (η10 = 337 mV) under alkaline medium conditions. Its activity is comparable to those of Pt single-atom catalysts (SACs) supported on a mesoporous carbon matrix. The good activity may be due to the modification of the D-band of Co by Mo doping and the relatively high electrochemically active surface area (ECSA) of 477.25 cm2, which is comparable to those of Ru SAC materials.
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Polymers
·
2023
·Vol. 15
·期 21
·4335
·
IF 5
Zhuo Chen,Qinghua Zhao,Jiahui Chen,Tao Mei,Wenwen Wang,Mufang Li,Dong Wang
Polypropylene melt-blown nonwoven fabric (PP MNF) masks can effectively block pathogens in the environment from entering the human body. However, the adhesion of surviving pathogens to masks poses a risk of human infection. Thus, embedding safe and efficient antibacterial materials is the key to solving pathogen infection. In this study, stable chlorinated poly(methacrylamide-N,N′-methylenebisacrylamide) polypropylene melt-blown nonwoven fabrics (PP-P(MAA-MBAA)-Cl MNFs) have been fabricated by a simple UV cross-link and chlorination process, and the active chlorine content can reach 3500 ppm. The PP-P(MAA-MBAA)-Cl MNFs show excellent hydrophilic and antibacterial properties. The PP-P(MAA-MBAA)-Cl MNFs could kill all bacteria (bothEscherichia coliandStaphylococcus aureus) with only 5 min of contact. Therefore, incorporating PP-P(MAA-MBAA)-Cl MNF as a hydrophilic antimicrobial layer into a four-layer PP-based mask holds great potential for enhancing protection and comfort.Keywords:polypropylene melt-blown nonwoven fabric;antibacterial materials;UV irradiation;superhydrophilicity;N-halamine
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Renchan Han,Xiangyu Wang,Iseult Lynch,Jun Ma
Considering the agglomeration and instability of nanoscale zero-valent iron (NZVI, Fe 0 ), N-enriched covalent organic polymer derived zero-valent iron (NZVI@N-COP) composite with excellent activity, high stability and as well as effective antibiotic removal capacity was innovatively synthesized via solvent thermal and in-situ reduction growth methods. The dispersion of NZVI is distinctly improved by using N-enriched covalent organic polymer (N-COP) as both matrix and dispersant. NZVI@N-COP exhibits excellent electron transfer capability and high TC removal efficiency without additional oxidants. The removal efficiency of TC was increased by 42.4% compared with that of pristine NZVI. The promoted activity of NZVI@N-COP can be ascribed to the strong coordination of Fe with N atoms between NZVI and N-COP, which reduces oxidation and leakage of Fe, exposing more available reactive sites to produce reactive oxygen species . Additionally, Characterization results show that the reaction mechanism involves adsorption and chemical oxidation of O 2 •– without additional oxidants. Optimum operating conditions were determined to be NZVI@N-COP dosage 0.1 g·L −1 , pH 6, and temperature 298 K. This research put forward a simple method for synthesis of highly effective N-COP derived NZVI and its application in the treatment of antibiotic pollutants.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yufa Sun,Hao Xin,Yi Wu,Chen Zhang,Changjie Chen,Xiangdong Zhou
A new type of flame-retardant polyether diols containing phosphorus, nitrogen, and sulfur (SPAE) was first synthesized by using phosphoryl chloride, 2-aminobenzothiazole and ethylene glycol . The SPAE as the soft segment was then utilized to prepare a series of flame-retardant waterborne polyurethanes (SPAE-WPU) through emulsion polymerization . Subsequently, SFR-WPU as a finishing agent was coated on polyamide fabric. When the content of SPAE-WPU was 18 wt%, the coated fabric exhibited a limiting oxygen index (LOI) of 28.2 %, afterflame time of 4.6 s, afterglow time of 0 s and damaged length of 11.2 cm, respectively. After 10 washes, the coated fabric retained its good flame-retardancy and anti-dripping properties. Furthermore, the flame-retardant mechanism of SPAE-WPU was investigated using various spectral analyses, which revealed that the P, N and S elements worked together to create non-combustible gas compounds, release free radicals, and promote dehydration and carbonization , leading to synergistic flame-retardant effects in both gas- and condensed-phase.
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