查找使用阿拉丁产品的科研文献

A self-supported S-doped Fe-based organic framework platform enhances electrocatalysis toward highly efficient oxygen evolution in alkaline media

Cong Ling,Xinyan Leng,Xiao-Jie Lu,Jing-Han Li,Zhengkun Yang,An-Wu Xu

The oxygen evolution reaction (OER) is a great crucial half-reaction in many energy conversion and storage techniques to alleviate the problems of the energy crisis and environmental pollution. However, the development of a low-cost and easy-to-prepare OER electrocatalyst with glorious performance and superior stability remains a huge challenge. Recently, metal–organic frameworks (MOFs) have attracted tremendous interest owing to their charming features including ultrafine porosity, rich active metal sites and tunable structures. However, most MOFs directly acting as electrocatalysts for the OER have intrinsic low electrical conductivity, poor electrochemical activities and short-term durability, hindering their practical application. Herein, we develop a facile and effective one-pot solvothermal method to rationally design a new S-doped Fe-based organic framework grown on nickel foam (NF), which prominently boosts the OER performance. Specifically, S0.05–Fe-BTB/NF exhibits remarkable OER activity with an ultralow overpotential of only 231 mV to afford 20 mA cm−2 current density without iR drop compensation in alkaline media, as well as a small Tafel slope of 41 mV dec−1, superior to that of the commercial RuO2 electrocatalyst. Particularly, it also demonstrates outstanding catalytic durability under an overpotential of 235 mV for 50 h. More significantly, the probable active species during the OER process are determined to be the electrochemically transformed metal oxyhydroxide.

Catalytic hydrogenolysis of lignin to phenolic monomers over Ru supported N,S-co-doped biochar: The importance of doping atmosphere

Gao Wenran,Wang Ke,Wu Yishuang,Zhu Xun,Wu Yinlong,Zhang Shoujun,Li Bin,Huang Yong,Zhang Shu,Zhang Hong

Doping of heteroatoms into carbon materials is a popular method to modify their physicochemical structures and has been widely used in the fields of energy conversion and storage. This study aims to investigate the effect of doping atmosphere on the catalytic performance of nitrogen and sulfur co-doped biochar supported Ru in the production of phenolic monomers from lignin hydrogenolysis. The results showed that the catalyst prepared under CO2 atmosphere (Ru@CNS-CO2) was able to produce phenolic monomers from corncob lignin with a yield up to 36.41 wt%, which was significantly higher than that from the run over N2-prepared catalyst (Ru@CNS-N2). The characterization of the catalysts demonstrated that the CNS-CO2 support had a larger specific surface area, richer C=S and C-S groups, and higher oxygen content than CNS-N2, resulting in finer Ru particles and more Ru0 content on the CNS-CO2 support. The Ru@CNS-CO2 catalyst exhibited high activity in hydrogenation and fragmentation of β-O-4 linkages.

Preparation of a novel supramolecular intumescent flame retardants containing P/N/S/Fe/Zn and its application in polylactic acid

Qinyong Liu,Xingyu Chen,Guiyang Zhu,Xiaoyu Gu,Hongfei Li,Sheng Zhang,Jun Sun,Xiaodong Jin

A novel integrative supramolecular intumescent flame retardant was fabricated by self-assembly of melamine, p -aminobenzene sulfonic acid and phytic acid and was abbreviated as MAP. After chelation with Fe 3+ or Zn 2+ , the resulted products (MAP-Fe and MAP-Zn) were melt-blended with polylactic acid (PLA) to enhance the flame retardancy of PLA. The fire performance was characterized by limiting oxygen index (LOI), UL-94 vertical burning and cone calorimeter tests. The results showed that control PLA was flammable with a low LOI of 20.4%, and it cannot satisfy any UL-94 grade for its severe ignited dripping, whilst the incorporation of 3% MAP-Zn increased the LOI to 29.2％, upgraded the UL-94 rating to V-0, and reduced the peak heat release rate by 18.7%. It was proposed that MAP-Zn mainly promoted the formation of more graphitic carbon in the char residues . In addition, the presence of 3% MAP-Zn slightly reduced the tensile strength of PLA from 64.9 MPa of the control PLA to 60.1 MPa, which met the requirements of most practical applications.

Insights into the mechanism of peroxydisulfate activated by magnetic spinel CuFe2O4/SBC as a heterogeneous catalyst for bisphenol S degradation

Bingyu Wang,Qiaoqiao Li,Ying Lv,Haibin Fu,Dingyi Liu,Yanfang Feng,Huifang Xie,Hongxia Qu

The CuFe 2 O 4 catalyst in advanced oxidation processes had received much attention, while the leaching metal ions and its agglomeration limited its application prospect. The conversion of waste activated sludge (WAS) into sludge-derived biochar (SBC) through pyrolysis could not only be the option of reducing the environmental burden but also converted to be the value-added environmental remediation materials. Hence, the present study prepared as a CuFe 2 O 4 /SBC heterogeneous catalyst to degrade new environmental pollutants (bisphenol S, BPS). To our best knowledge, CuFe 2 O 4 /SBC as a heterogeneous catalyst activating peroxydisulfate to degrade BPS in solution is rarely reported, and the catalytic performances and degradation mechanism of CuFe 2 O 4 /SBC need to be comprehensively investigated. The synergistic effect between CuFe 2 O 4 and SBC enhanced catalytic performances and alleviated agglomeration. The CuFe 2 O 4 /SBC was greatly ameliorated metal ions leaching, but the synthetic strategy could better optimize to further reducing Cu ion leaching. The dominant role of heterogeneous catalysis by CuFe 2 O 4 /SBC also have been elucidated. It was proposed that radical ( OH and SO 4 − ) and non-radical ( 1 O 2 ) oxidation processes worked together for BPS degradation, but surface-bound radical pathways played more crucial roles. Some intermediate products with higher toxicity may be produced due to the non-completely mineralized, thus future attention should be paid to their environmental risks. Hence, the detoxification efficiency of CuFe 2 O 4 /SBC needs to be further strengthened via improving the reaction conditions. Overall, this study provided a new strategy to simultaneously solve the problems of WAS disposal and leaching metal ions of CuFe 2 O 4 .

A solvent-governed surface state strategy for rational synthesis of N and S co-doped carbon dots with multicolour fluorescence

Ming Wen,Zhenxing Qin,Wenhai Wang,Junchao Cui,Rui Zhang,Qingmei Zhang,Kun Li,Jinhong Li,Wen Yang,Yi Zhou

A new aminobenzoate-substituted s-triazin-based Zr metal organic frameworks as efficient catalyst for biodiesel production from microalgal lipids

Jun Cheng,Lei Qian,Hao Guo,Yuxiang Mao,Yang Shao,Weijuan Yang

In order to solve problems that large molecules of microalgal lipids were difficult to access active sites in micropore structures of traditional metal organic frameworks (MOF), a novel two-dimensional nanosheet catalyst (aminobenzoate-substituted s-triazin-based Zr metal organic frameworks, Zr-TATAB) that exposed more active sites with stronger acidity was synthesized through replacement of trimesate linker in water/acid-resistant Zr-based MOF-808 with 4,4 ́,4 ́ ́- s -triazine-1,3,5-triyltri- p -aminobenzoate (H 3 TATAB) to promote catalytic conversion efficiency of microalgal lipids to biodiesel . The binding energy of Zr increased by 0.2 eV due to electronic shift caused by triazine ring and imine groups in H 3 TATAB ligand, which led to more exposed Zr 4+ active sites in Zr-TATAB catalyst. Due to increase of charge on crystal edges, dissociation of terminal hydroxyl groups was inhibited and Coulomb repulsion was increased. Therefore, Zr-TATAB catalyst possessed higher dispersion to avoid from pore blocking and catalytic deactivation, which enhanced recycling performance of catalyst. Compared with MOF-808, the total number of acid and base sites in Zr-TATAB catalyst increased from 6.0 mmol g −1 to 8.0 mmol g −1 , while strength of acid sites increased with an increased ammonia desorption temperature by 150 °C, which led to an increased catalytic conversion efficiency of microalgal lipids to biodiesel to 98.2%.

Study on the removal of amyloid plaque by nano-gold in the treatment of neurodegenerative disease-alzheimer’s disease

Chai Hongyan,Wang Xueyong,Liu Zhimin,Zhao Yuehan

As a complex neurological disease, the treatment of Alzheimer’s disease (AD) is a global challenge. Compared with traditional drug therapy, a novel therapeutic tool, inorganic nanoparticles combined with photothermal therapy (PTT) can decompose amyloid β-protein (Aβ) fibrils and inhibit Aβ aggregation, alleviating AD symptoms. In this study, MoS2@Au NPs composite nanoparticles were constructed by combining sulfhydryl-modified Au NPs and MoS2 nanosheets. In vitro experiments showed that the composite nanoparticles could degrade insoluble Aβ fibers to soluble monomers and alleviate neurotoxicity. Additionally, the excellent biocompatibility and biosafety of MoS2@Au NPs reduced the damaging effects on nerve cells, and the AD model mice benefited from the treatment with MoS2@Au NPs, which significantly improved their learning and cognitive abilities and thus reduced the disease. More importantly, MoS2@Au NPs combined with PTT effectively curbed the inflammatory response and slowed down the course of AD.

Transition Metal Ion Chemically Induced Interface Resistant to Li Polysulfide Corrosion on the Li Metal Anode for Li–S Batteries

Hongxing Wang,Zhipeng Yin,Chengwei Ma,Zipeng Sun,Hao Feng,Fei Chen,Jiangqi Zhou,Tinglu Song

Lithium–sulfur (Li–S) battery systems are universally recognized as frontrunners in next-generation energy storage owing to their energy densities exceeding 2600 Wh kg–1. Nevertheless, their practical implementation remains constrained by severe Li metal anode degradation caused by polysulfide shuttle mediated corrosion, which drastically decreases achievable energy densities. This work pioneers an innovative interfacial engineering strategy leveraging transition metal ion synergies to fundamentally address this challenge. Through chemically induced anion modulation, nickel species spontaneously reconfigure into a protective solid electrolyte interphase (SEI) at Li surfaces. This engineered inorganic-dominant architecture demonstrates dual functionality that effectively passivates polysulfide-induced electrochemical corrosion and dramatically curtails electrolyte decomposition kinetics. Remarkably, even in LiNO3-free configurations, the optimized system achieves exceptional cycling stability (76.4% capacity retention). These findings establish a paradigm-shifting framework for developing practically viable high energy density Li–S systems through a rational interface design.

How does aluminum sulfate-based alkali-free accelerator affect calcium silicate hydrate (C-S-H) formation in accelerated cement pastes?

Xin Liu,Dining Li,Hui Xie,Jiachen Yao,Xuyan Shen,Haochuan Wang,Zhengyao Qu,Zuhua Zhang,Pan Feng

Alkali-free aluminum sulfate (AS)-based accelerators have become a widely adopted and indispensable admixture for shotcrete applications. However, their effects on the formation kinetics and properties of calcium silicate hydrate (C-S-H) – the primary hydrate in shotcrete – remain insufficiently understood. To bridge this knowledge gap, a combination of isothermal calorimetry, QXRD, and TGA was employed to uncover the temporal evolution of C-S-H. In addition, the chemical compositions and silicate chain structure were comprehensively examined using BSE-EDS, 27 Al NMR, coupled with 29 Si NMR techniques. Our results demonstrate that AS addition accelerated C 3 S hydration, promoting the C-S-H nucleation and growth rate. This acceleration effect can be ascribed to (1) the accelerated dissolution of silicate phases at early stages, and (2) the formation of divergent C-S-H needles, providing more nucleation sites while mitigating impingement between adjacent C-(A)-S-H needles. Multiple characterizations confirmed the enhanced incorporation of aluminum into C-S-H, predominately at the bridging site. Notably, increasing AS content decreased the Si/Ca of the C-(A)-S-H and concurrently enhanced the aluminum incorporation. This compositional shift led to the formation of longer aluminosilicate chains and concomitant improvements in the hardness and elastic modulus of C-(A)-S-H. These findings offer valuable insights into AS-induced alterations in C-(A)-S-H within accelerated cement pastes, facilitating the deeper understanding of the role of C-(A)-S-H in strength development and long-term durability of shotcrete.

In-situ preparation of mossy tile-like ZnIn2S4/Cu2MoS4 S-scheme heterojunction for efficient photocatalytic H2 evolution under visible light

Shikai Wang,Dafeng Zhang,Ping Su,Xintong Yao,Junchang Liu,Xipeng Pu,Hengshuai Li,Peiqing Cai

The reasonable design and fabrication of heterojunction could regulate the photocatalytic performance to some extent, yet it is still a great challenge to construct the S-scheme heterostructure with the stable as well as tight interface on the surface of semiconductor photocatalysts. Herein, the ZnIn 2 S 4 /Cu 2 MoS 4 (ZIS/CMS) S-scheme heterostructure was fabricated by in-situ assembling ZIS nanosheets on the CMS plates, obtaining a mossy tile-like morphology. Owing to the compact interface resulting from in-situ growth, this unique architecture efficiently facilitated the separation and transfer of light-induced charges, guaranteed the larger interface area, and enriched the active sites for photocatalytic redox reactions. After adjusting the mass ratio of CMS in ZIS/CMS, S-scheme heterostructure exhibited the remarkable performance with an optimal H 2 producing rate up to 1298 μmol·h −1 g −1 , about 13.8 times than that of pristine ZIS. The mechanism and driving force of charge transfer and separation in S-scheme heterostructure photocatalysts were explained and discussed. This investigation will provide new insight into design and construction of S-scheme heterojunction photocatalysts for H 2 evolution.

Effective production of S-allyl-L-cysteine through a homogeneous reaction with activated endogenous γ-glutamyltranspeptidase in garlic (Allium Sativum)

Xu Xiaobian,Miao Yelian,Chen Jie Yu,Zhang Qimei,Wang Jining

S-allyl-L-cysteine (SAC) is a bioactive compound in garlic ( Allium sativum ). A novel process including soaking and homogeneous reaction was applied for the effective production of SAC with endogenous γ-glutamyltranspeptidase (γ-GTP, EC 2.3.2.2) in garlic. The effects of temperature and CaCl 2 concentration on γ-GTP activity in soaking, and the relationship of SAC production with γ-GTP activity in homogeneous reaction were investigated, using fresh garlic as raw material. The experimental results showed that the γ-GTP in fresh garlic was activated by soaking. The yield rate and the final content of SAC increased linearly with increasing initial γ-GTP activity in the homogeneous reaction at 37 °C. The final SAC content reached 606.3 μg/g (i.e. 32 times higher than that in fresh garlic) after soaking for 72 h in a 10-mM CaCl 2 solution at 10 °C, and the homogeneous reaction for 8 h at 37 °C. SAC was produced effectively through the homogeneous reaction with activated endogenous γ-GTP in garlic.

Highly Selective Mixed-Matrix Adsorbents Embedded with Anion-Pillared Microporous Materials and Poly(ionic liquid)s toward Sulfur Dioxide Capture

Siheng Qian,Jing Hu,Rimin You,Xiaobing Wang,Lifeng Yang,Huabin Xing,Xili Cui

SO2 emission has become an important issue due to its harmful impact on human health and the ecological environment. Adsorption separation is an energy-efficient technology to capture SO2, but it suffers from competitive adsorption of CO2. Here, we present a strategy to improve the separation performance of porous adsorbents through the fabrication of mixed-matrix adsorbents. By the introduction of a perm-selective polymer (P(D[VImC6]Br)) as the matrix to enclose anion-pillared microporous materials (SIFSIX-3-Ni), CO2 molecules were selectively blocked, while the SO2 molecules could still permeate the polymer matrix and access the porous particles of SIFSIX-3-Ni. As a result, a high SO20.2%/CO210% uptake ratio of 32 at 298 K and 1 bar and a high SO2 uptake capacity of 0.67 mmol g–1 at 0.002 bar were achieved for the mixed-matrix adsorbents of SIFSIX-3-Ni@PIL-1/1. The strategy for fabricating a perm-selective matrix around the porous adsorbent particles to improve the adsorption performance is generally applicable to other porous adsorbents.