JOURNAL OF SOLUTION CHEMISTRY
·
2023
·Vol. 52
·期 7
·762-789
·
IF 1.2
Li Min,Zhang Xiaocheng,Yu Yingmin,Liu Lanmu
The extractive distillation was used to separate ethylbenzene and m-xylene. After the solvent screening, 1,2,4-trichlorobenzene was chosen as the extractive solvent. The vapor–liquid equilibrium (VLE) of binary mixtures of m-xylene, ethylbenzene, and 1,2,4-trichlorobenzene was measured at 101.33 kPa. The measurements were taken with a modified Rose equilibrium still. The Wisniak’s test was used to assess the thermodynamic consistency of the VLE experimental results. To obtain the binary interaction parameters, the binary VLE experimental data were correlated with the NRTL, Wilson, and UNIQUAC activity coefficient models. The results showed that three models all fit the experimental values of three binary systems well, and the ternary VLE data of m-xylene + ethylbenzene + 1,2,4-trichlorobenzene were estimated using Aspen Plus V11 based on these model parameters. The experimental data agree well with the estimation values generated from three models. Finally, the effect of 1,2,4-trichlorobenzene as an extractant was analyzed, and it is proved to have a good influence on the separation of ethylbenzene from mixed xylenes by extractive distillation.
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IONICS
·
2023
·Vol. 29
·期 5
·1741-1749
·
IF 2.8
Xiong Qiming,Li Xiongzhuang,Zhou Mulan,Chen Rentian,Sun Cheng,Zhou Yanyan,Wang Sijia,Qiu Xiangyun,Song Meijia,Wei Tao
Nickel cobalt layered double hydroxide (NiCo-LDH) nanosheets have attracted much interests in lithium-ion batteries (LIBs) because of its high capacity and low cost. However, the low cycling stability limits their practical applications. Herein, we introduce a simple one-pot hydrothermal method to fabricate a novel flower-shaped Zif-67@NiCo-LDH heterostructure as the anode materials. The structures, morphology, and compositions of the materials were studied by XRD, SEM, TEM, XPS, EDX, and Raman spectra. Electrochemical tests were also conducted. The Zif-67@NiCo-LDH simultaneously inherited the cycling stability of Zif-67 and the high capacity of NiCo-LDH, which effectively improves the conductivity and structural integrity under the synergistic effect of the flower-shaped heterostructures and compositions and showed a good electrochemical performance. This work might enable the future design of heterostructures materials with layered double hydroxide for many other energy-storage technologies.
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Reaction Kinetics Mechanisms and Catalysis
·
2023
·Vol. 136
·期 2
·771-786
·
IF 1.8
Su Haitang,Yang Zhixiu,Xiao Guomin,Gao Lijing,Wei Ruiping,Zhang Jin
A series of cost-effective (X) K 2 CO 3 /γAl 2 O 3 catalysts for efficient conversion of vinyltrimethoxysilane (VTMOS) to vinyltris(β-methoxyethoxy)silane (VTMOEOS) were synthesized. The microstructure and active site of the synthesized catalysts were analyzed by BET, XRD, FT-IR, SEM, and CO 2 -TPD. The results showed that the synthesized catalysts formed K–O–Al strong basic sites while maintaining the original structure, which greatly improved the basic strength of the catalysts. It was found that the 60%K 2 CO 3 /γAl 2 O 3 possessed the highest the catalytic activity under the activation temperature of 600 °C by optimizing the preparation conditions of K 2 CO 3 /γAl 2 O 3 . Moreover, the optimal reaction process conditions were also determined by optimizing the experimental reaction temperature, reaction time, catalyst dosage, and reactant molar ratio under (60%, 600 °C) K 2 CO 3 /γAl 2 O 3 catalysis. Under the optimal reaction conditions, the conversion of VTMOS was 92.5% and the yield of VTMOEOS was 65%. Meanwhile, the 60%K 2 CO 3 /γAl 2 O 3 catalyst was satisfactorily reusable and maintained a high catalytic activity after four cycles of catalytic reactions.
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Science China-Life Sciences
·
2023
·
IF 9.1
Tang Kegong,Wang Xiaona,Zhao Yu,Li Xiaobei,Jiang Zhenyu,Mei Song,Chen Mingrui,Ma Yiming,Du Xinyi,Qiao Xiangyu,Sun Na,Liu Jiaqi,Jiang Chengyu
Hypertension has become a growing public health concern worldwide. In fact, hypertension is commonly associated with increased morbidity and mortality. Currently, oligonucleotide drugs have proven to be promising therapeutic agents for various diseases. In the present study, we aimed to demonstrate that a herbal small RNA (sRNA), XKC-sRNA-h3 (B55710460, F221. I000082.B11), exhibits potent antihypertensive effects by targeting angiotensin-converting enzyme (ACE) in mice. When compared with captopril, oral administration of the sphingosine (d18:1)-XKC-sRNA-h3 bencaosome more effectively prevented angiotensin II-induced hypertensive cardiac damage and alleviated kidney injury in mice. Such findings indicated that XKC-sRNA-h3 may be a novel orally available ACE inhibitor type oligonucleotide drug for hypertension.
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PubMed
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 2
·413-422
·
IF 2.5
Zhou Jianhua,Liu Geng,Niu Zhuanli,Li Xinyue,Zhao Jiaojiao,Li Xiang
Hyperbranched waterborne polyurethane solid–solid phase change material was prepared by A 2 + B 3 method in water. Hyperbranched polyurethane solid–solid phase change material (HBPUPCM) was synthesized through reaction of isocyanate terminated prepolymer (A 2 ) with trimethylolpropane (B 3 ). Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance were used to confirm the prepared HBPUPCM. Differential scanning calorimetry showed that the maximum latent heat of HBPUPCM was Δ H m of 161.57 J/g and Δ H c of 153.44 J/g. The thermal storage ability was stable even after 500 consecutive heating/cooling cycles. The as-prepared HBPUPCM had excellent thermal stability as was shown by thermogravimetric analyzer. In addition, X-ray diffraction and polarized optical microscopy showed that HBPUPCM had crystalline structure. Meanwhile, when the poly(ethylene glycol) content was 80 wt%, the cotton fabric finished with HBPUPCM had a lower heating and cooling rate, higher phase change enthalpy and better temperature regulation performance in comparison with the unfinished cotton fabric. The HBPUPCM may be highly feasible and promising in the field of intelligent thermoregulation fabric industry.
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IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-PLANT
·
2023
·Vol. 59
·期 1
·61-73
·
IF 2.6
Li Xiaofang,Fang Pingping,Li Mingxuan,Xu Pei
Structural analogs of enzyme substrates involved in plant hormone biosynthesis can either inhibit or enhance hormone-related responses depending on their specific chemical characteristics. Ethylene is an important gaseous phytohormone regulating a myriad of physiological and developmental processes. The substrate of the ethylene biosynthesis key enzyme ACC oxidase (ACO), 1-aminocyclopropane-1-carboxylate acid (ACC), is the direct precursor of ethylene. Previous studies have identified a series of ACC analogs as ethylene antagonists competitively binding with ACO. Here, this study identified methyl 1-aminocyclopropanecarboxylate (methyl-ACC), a structural analog of ACC, as an agonist of ethylene response in plants. Methyl-ACC triggered enhanced ethylene-related responses in plants similar to the effects of ACC, such as restrained root elongation, increased root hair number, promoted dark-induced leaf senescence, and accelerated ripening of postharvest tomato fruit. A higher amount of ethylene release was detected from the tomato leaves treated with methyl-ACC than from the mock control. These bioactivities of methyl-ACC render it a potential plant growth regulator (PGR) for the agricultural and postharvest industries. RT-qPCR revealed a generally upregulated expression of the ethylene biosynthesis genes in detached tomato leaves under methyl-ACC treatment. In vivo and in vitro enzymatic activity analyses showed that methyl-ACC had no obvious effect on the total ACO activity in detached tomato leaves nor on the activity of recombinant SlACO1, the predominantly expressed ACO family member in this tissue. This study offers a promising new PGR and adds to the current knowledge on the structure–function-regulation relationship of compounds associated with ethylene biosynthesis. The mechanism by which methyl-ACC exerts its function is discussed.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 17
·51271-51287
·
IF 5.8
Li Zhishuncheng,Yang Can,Qu Guangfei,Cui Qingyuan,Yang Yixin,Ren Yuanchuan,Yang Yuyi,Wang Fang
Hexavalent chromium Cr(VI) is one of the most hazardous oxygen-containing anions to human health and the environment. Adsorption is considered to be an effective method for the removal of Cr(VI) from aqueous solutions. Based on an environmental perspective, we used renewable biomass cellulose as carbon source and chitosan as functional material to synthesize chitosan-coated magnetic carbon (MC@CS) material. The synthesized chitosan magnetic carbons were uniform in diameter (~ 20 nm) and contain a large number of abundant hydroxyl and amino functional groups on the surface, meanwhile owning excellent magnetic separation properties. The MC@CS exhibited high adsorption capacity (83.40 mg/g) at pH 3 and excellent cycling regeneration ability when applied to Cr(VI) removal in water, removal rate of Cr(VI) (10 mg/L) was still over 70% after 10 cycles. FT-IR and XPS spectra showed that electrostatic interaction and reduction with Cr(VI) are the main mechanisms of Cr(VI) removal by MC@CS nanomaterial. This work provides an environment-friendly adsorption material that could be reused for the removal of Cr(VI) in multiple cycles. Graphical Abstract
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 7
·3703-3712
·
IF 2.2
Zhou Zhiqiang,Cen Jianfang,Wang Huixiao,Sun Yu,Yang Liyun
Due to the high importance of transferrin in targeting tumor, the investigation on the functionalization process of quantum dots (QDs) using transferrin is very essential. In this paper, the interaction between CdSe and CdSe@ZnS QDs with transferrin was studied by various spectroscopies. It was found that the two types of QDs triggered the fluorescence quenching of transferrin by the static quenching mechanism. At 298 K, the binding constant for CdSe@ZnS QDs (8.03 × 10 6 L·mol −1 ) is higher than CdSe QDs (2.84 × 10 6 L·mol −1 ), implying that CdSe@ZnS QDs could bind stronger to transferrin. In addition, the values of enthalpy change (∆ H ), entropy change (∆ S ) and Gibbs free energy change (∆ G ) were negative, indicating that the binding procedures between both QDs and transferrin were spontaneous and the main binding forces were hydrogen bonding and van der Waals force. The results of CD spectra indicated that both QDs induced the conformational change of transferrin, which further caused the release of iron ions from transferrin. Compared with CdSe QDs, less contents of iron ions in transferrin were detected after interaction with CdSe@ZnS QDs. Additional cytotoxicity tests showed that both QDs were toxic to Hela and 293T cells, but the cytotoxicity of CdSe QDs was stronger than that of CdSe@ZnS QDs. Moreover, the combination of transferrin failed to promote the cytotoxicity of CdSe QDs and CdSe@ZnS QDs, which is ascribed to the release of iron ions during the interaction process between QDs and transferrin.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 1
·173-183
·
IF 1.6
Zhang Nan,Li Jinfeng,Tian Bo,Zhang Jianwei,Li Tuo,Li Zhigang,Wang Yi,Liu Zhixin,Zhao Hongtao,Ma Fuqiu
A novel phosphorylated cellulose carbamate (PCC- x ) by introducing urea into the functionalized reaction is demonstrated. The effects of urea content on the structures and U(VI) adsorption properties of PCC- x are investigated. The results indicate that urea provides new amino sites along cellulose chains and plays a decisive role in the phosphorylation modification of cellulose carbamate. When the content of urea is optimized, the sample possesses the maximum degree of phosphorylation, resulting in the excellent U(VI) adsorption properties, including high adsorption capacity (1006.9 mg·g −1 at pH = 5 and T = 298 K), fast adsorption dynamics, good adsorption selectivity and reusability. Graphical abstract Phosphorylated cellulose carbamate for highly effective capture of U(VI)
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Friction
·
2023
·Vol. 11
·期 5
·716-736
·
IF 6.8
Xin Lei,Li Hao,Gao Jian,Wang Zhongwei,Zhou KaiJie,Yu Sirong
It is still a challenge to achieve large-area preparation of robust superhydrophobic surfaces with strong mechanical stability. Here, a simple and low-cost method to prepare robust decoupling superhydrophobic coatings on aluminum (Al) alloys substrate has been presented. The superhydrophobicity and robustness of decoupling coatings are realized by structuring surfaces at two different length scales, with nanostructures for superhydrophobicity and microstructures for robustness. This prepared decoupling coating shows promising superhydrophobicity, with water contact angle (CA) of ∼158.4° and roll off angle (RA) of ∼3°. It also exhibits high repellency for impacting water droplets. Notably, the decoupling coating processes outstanding adhesion strength on the substrate after tape-peeling and cross-cut tests, also with promising wear resistantance after sandpaper abrasion and wear test. The friction coefficient of this decoupling coating is only ∼0.2. In addition, the robust decoupling superhydrophobic coating is applied to underwater buoyancy enhancement and fluid resistance reduction (drag reduction rate ∼30.09%). This decoupling superhydrophobic coating also displays promising self-cleaning and antifouling properties. Moreover, benefitting from the photocatalytic property of TiO 2 , this decoupling coating is also exploited for degrading organics to achieve seawater purification. This obtained decoupling superhydrophobic coating is expected to apply on other solids in marine fields, and the simple and eco-friendly method develops the potential practical application.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Liu Zhankai,Liu Ziyi,Fan Jie,Lu Wen-Duo,Wu Fan,Gao Bin,Sheng Jian,Qiu Bin,Wang Dongqi,Lu An-Hui
Oxidative dehydrogenation (ODH) of alkane over boron nitride (BN) catalyst exhibits high olefin selectivity as well as a small ecological carbon footprint. Here we report an unusual phenomenon that the in-situ formed olefins under reactions are in turn actively accelerating parent alkane conversion over BN by interacting with hydroperoxyl and alkoxyl radicals and generating reactive species which promote oxidation of alkane and olefin formation, through feeding a mixture of alkane and olefin and DFT calculations. The isotope tracer studies reveal the cleavage of C-C bond in propylene when co-existing with propane, directly evidencing the deep-oxidation of olefins occur in the ODH reaction over BN. Furthermore, enhancing the activation of ethane by the in-situ formed olefins from propane is successfully realized at lower temperature by co-feeding alkane mixture strategy. This work unveils the realistic ODH reaction pathway over BN and provides an insight into efficiently producing olefins.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 6
·期 1
·1-10
·
IF 11.806
Ye Mengting,Wang Shengdan,Ji Xingxiang,Tian Zhongjian,Dai Lin,Si Chuanling
Superhydrophobic coatings have been widely developed to endue the materials with antibacterial, self-cleaning, antiseptic, and some other multifunctionalities. Fluorochemicals are the most commonly used superhydrophobic coatings; however, the released toxic substances from fluorinated polymers are a significant source of water pollution and even a threat to human health. With the increasingly great attention to the environment, it is imperative to exploit green and effective hydrophobic coatings. Here, a nanofibrillated cellulose-based multifunctional superhydrophobic coating (NMSC) was fabricated by using an efficient silylation process from cellulose, tetraethyl orthosilicate, and cetyl trimethoxysilane. Microscopic, chemical structural, and thermal properties analyses revealed that the NMSC has nanoroughness, low surface energy, and good thermal stability. More importantly, the NMSC displayed an unprecedented hydrophobic and self-cleaning performance (water contact angle ~ 165°). The NMSC superhydrophobic coating can realize long-term effective barriers to many fluids, including strong acid (pH 1), strong alkali (pH 13), alcohols, alkanes, esters, and some other organic solvents. Moreover, the NMSC also exhibited a certain degree of antibacterial performance. This work provides a good approach for not only the high-value application of cellulose but also the development of ecological and sustainable multifunctional coatings. Graphical Abstract
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