INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2017
·
IF 3.671
Chao Liu,A.M. Omer,Xiao-kun Ouyang
In the present study, new composite beads based on carboxymethyl cellulose (CMC)/k-carrageenan (kC)/activated montmorillonite (AMMT) were prepared for adsorptive removal of cationic methylene blue (MB) as a dye model. The structure and morphology of the composite beads were investigated by FT-IR and SEM, while the thermal properties were tested using TGA. Factors affecting the removal percent of MB such as CMC/kC/AMMT ratios, initial MB concentration, pH medium, adsorbent dosage, solution temperature, and agitation speed were also explored. Results demonstrated that MB removal (%) exceeded 92% after 120 min using CMC/kC/AMMT (1:1:0.4 ratio) compared to 69% in case of free AMMT beads. Moreover, data obtained from isotherm studies were fitted well to Langmuir model (R 2 = 0.999), and the kinetics of adsorption followed pseudo-second order model. Finally, the composite beads showed good reusability for MB dye removal with high efficiency. Results obtained from this study suggest that the prepared composite beads could be applied effectively for removing cationic dyes from aqueous solutions.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Jingyu Wu,Lianzheng Zhang,Dongmei Xu,Jun Gao,Kai Zhang,Meng Kong
The solubility of sodium thioglycolate in five pure solvents of water, methanol, ethanol and isopropyl alcohol, n-propanol and four binary solvent mixtures (water + methanol, water + ethanol, water + isopropyl alcohol, water + n-propanol) was determined within the temperature range from (293.15 to 333.15) K by using the gravimetrical method under atmospheric pressure (p = 0.1 MPa). The solubility of sodium thioglycolate in water, ethanol, isopropyl alcohol, and n-propanol increases with a rise of temperature, but the solubility decreases in methanol with increasing temperature. Meanwhile, in the binary solvent mixtures (water + methanol, water + ethanol, water + isopropyl alcohol, water + n-propanol), the solubility of sodium thioglycolate increases with increasing the mole fraction of water and with temperature. The modified Apelblat equation and van’t Hoff equation were applied to correlate the solubility of sodium thioglycolate in the five pure solvents, while in the binary solvent mixtures, the solubility was correlated by the modified Apelblat equation, CNIBS/R-K model, and Jouyban–Acree model. It was shown that the correlated results were in better agreement with the experimental data. Also, the mixing thermodynamic properties for sodium thioglycolate in the binary solvent mixtures were calculated.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Zihan Wang,Yujia Ouyang,Huanyu Liang,Xinyu Wang,Yu Ma,Weiqian Tian,Jingwei Chen,Jing Shi,Minghua Huang,Huanlei Wang
Transition metal dichalcogenides (TMDs) emerge as advanced anode materials of potassium-ion batteries (PIBs), owing to the impressive capacities, strong redox reversibility, and advantageous conversion reactions with relatively weak metal-sulfur bonds. However, TMDs face inherent drawbacks that contribute to suboptimal rate performance and limited cycling stability such as low electrical conductivity, sluggish reaction kinetics, and unsatisfactory structural stability. To overcome these challenges, ultrafine heterojunction (between CoS 2 and FeS 2 ) wrapped in two-dimensional transition metal carbides (MXene) and nitrogen-sulfur co-doped carbon network (MXene@CoS 2 /FeS 2 @NSC) is synthesized as anodes for PIBs. The built-in electric field generated by heterojunction and high specific surface area network of MXene and carbon both contribute to excellent electrochemical performance. Consequently, the synthesized MXene@CoS 2 /FeS 2 @NSC anode exhibits impressive reversible capacity (605/175 mA h g −1 at 0.05/10 A g −1 ) and outstanding cycling stability (304 mA h g −1 at 0.5 A g −1 after 2000 cycles). The assembled potassium ion capacitors (PICs) with MXene@CoS 2 /FeS 2 @NSC anode exhibit outstanding cycling performance, maintaining nearly 100 % coulombic efficiency and over 10,000 cycles with 96 % capacity retention at 10 A g −1 . This work introduces a versatile synthetic method for preparing bimetallic sulfide heterojunction, providing useful points for the further study of advanced electrode materials for PIBs.
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RARE METALS
·
2025
·
IF 11
Luo Qi-Zhi,Huang Jin-Shu,Liu Teng-Yu,Yuan Ji-Li,Belousov Artem S.,Li Sheng-Kun,Yang Song,Li Hu
Photocatalytic selective synthesis of lactic acid (LA) from biomass sugars with a single heterogeneous catalyst is promising but challenging due to the multiple reaction steps involved. Herein, a K-doped C-rich red polymerized carbon nitride (RPCN) photocatalyst with uniform K/C dual sites was constructed by a molten salt template method, which was highly efficient for cascade isomerization dehydration of glucose to LA with > 90% selectivity under visible light and gentle conditions. Control experiments and theoretical calculations expounded that the introduced K/C dual sites could improve the light capture ability and photogenerated charge separation efficiency, while the K species provided sufficient Lewis acid sites (adsorption sites) for the isomerization of glucose to fructose. Meanwhile, the introduced C sites that substitute N atoms could promote electrons to be captured by adsorbed oxygen for selective generation of superoxide radicals, which was highly efficient for the scission of the C3–C4 bond in fructose, exclusively furnishing LA. Importantly, the RPCN photocatalyst was also suitable for the photocatalytic upgrading of various biomass saccharides into LA with high yields of 81.3%–95.3% and could be recycled for five consecutive cycles. The tailored construction of dual sites by localization of space charge lightens an avenue for multi-step conversion of biomass with pronounced selectivity. Graphical abstract
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Energy Storage Materials
·
2023
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IF 20.4
Xiaojuan Chen,Yan Meng,Dan Xiao,Yiying Wu,Lei Qin
Although metallic potassium or graphite anode with low redox potentials are desirable for potassium-ion batteries (PIBs), the severe capacity decay caused by consecutive reduction reactions on the aggressively reactive anode surface is inevitable because of the scarcity of an effective passivation layer. Additionally, the development of PIBs faces potential safety hazards due to the usage of reactive anodes with flammable electrolytes. Herein, a fire-retardant localized high-concentration electrolyte (LHCE) is formulated by adding a low-polarity co-solvent of highly fluorinated ether into the concentrated potassium bis(fluorosulfonyl)imide/trimethyl phosphate. A unique electrolyte solvation environment with the enhanced anion-cation interaction in an LHCE facilitates a durable anion-derived solid electrolyte interphase (SEI) with self-accelerated interfacial kinetics and minimizes the SEI dissolution compared to the conventional carbonate-based electrolyte. Consequently, the unmodified Al substrate could sustain stable potassium metal cycling above 3400 h (over 800 cycles) with high reversibility (98%), and the graphite anode retains prolonged cyclic stability (over 300 cycles) with a high reversible capacity (257.6 mAh g −1 ) and capacity retention (92.6 % at 0.2 C). Meanwhile, Al corrosion at high voltage is significantly suppressed, and the electrochemical window is extended due to less free solvents in an LHCE, enabling good electrolyte compatibility with high-voltage cathodes. Coupling non-flammable solvents and the concept of LHCE could facilitate a better understanding of electrolyte chemistry and offer more opportunities to use K or graphite anode for all Al substrate-based PIBs highlighted with high performance and superb safety.
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Separations
·
2025
·Vol. 12
·期 9
·249
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IF 2.7
Ru Zhao,Xiaoli Li,Yazhou Bao,Wenjun Xu,Chen Xu,Rongrong Wang,Tianlan Xia,Tingli Liu,Ailing Ben
In this investigation, pinocembrin and galangin were efficiently extracted from the male inflorescence ofPopulus albaL. ×berolinensisK. Koch through an enzymatic pretreatment–ultrasonic-assisted strategy (EP-UAS), and the feasibility of their pilot-scale application was validated. The optimal parameters (ethanol volume fraction, cellulase dosage, incubation temperature, incubation time, pH, liquid‒solid ratio, ultrasonic irradiation power during incubation, duty cycle, ultrasonic irradiation power and time during extraction) affecting pinocembrin and galangin yields were systematically explored. The Box–Behnken design (BBD) results provided optimal parameters for the EP-UAS process. Under the optimal conditions, the actual yields of pinocembrin and galangin were 2158.33 ± 0.13 μg/g and 1257.96 ± 0.06 μg/g, respectively. Stability, recovery and reproducibility were determined under the above optimized conditions to evaluate the proposed EP-UAS method. Moreover, laboratory-scale experimental results revealed that the conditions selected via single-factor and response surface experiments were also applicable to pilot-scale production, facilitating industrialization.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2025
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IF 2.1
Yu Bi,Xiao chen Ye,Jingwen Zhang,Ziyin Wang,Zenan Gong,Yanmin Shen,Wenju Liu
In the study, the experiment solubility of difenidol hydrochloride was determined in 12 neat solvents [water, methanol, ethanol, n-propanol, n-butanol, 1-pentanol, N-methyl-2-pyrrolidone(NMP), N,N-dimethylformamide(DMF), N,N-dimethylacetamide (DMA), dimethyl sulfoxide (DMSO), acetonitrile (MeCN), and acetic acid] at a temperature range from 278.15 to 323.15 K by a gravimetric method under 0.1 MPa. Results indicated that the experimental mole fraction solubility (10x) order of difenidol hydrochloride in 12 neat solvents at the temperature 298.15 K was: methanol(0.1771)>DMSO(0.1343)>NMP(0.0725)>acetic acid (0.0601)>DMF(0.0467)>DMA(0.0357)>ethanol (0.0336)>n-propanol (0.0255)>n-butanol (0.0137)≈water (0.0135)>1-pentanol (0.0098)>MeCN (0.0041), and solubility increased with the increase in temperature. Three models, including Modified Apelblat model, Van’ t Hoff model, and Yaws model, were applied to correlate the experimental data and analyze the solubility data of difenidol hydrochloride. Based on the principle of similar compatibility, the law of solubility and miscibility of difenidol hydrochloride in selected solvents was discussed according to Hansen solubility parameters (HSP) and solvent effect for predicting solubility behavior.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Zhouxin Chang,Wenli Guo,Chen Yang,Changshen Ye,Qinglian Wang,Bochen Li,Yaodong Xiao,Jie Chen,Ting Qiu
The semiconductor industry’s rapid evolution necessitates ultra-high-purity N-methyl pyrrolidone (NMP) as an essential electronic-grade solvent. The development of an efficient coordination material to reduce trace metal ions, particularly Na and K metal ions, to below 1 ppb in NMP solution is a significant challenge. To address this, a novel coordination material, St-DVB-g-ACE, has been developed for the removal of Na and K metal ions from NMP. The material was synthesized by grafting 4′-aminobenzo-15-crown-5-ether onto a strong acid gel resin. The resulting St-DVB-g-ACE-3 exhibited excellent coordination performance for Na and K metal ions, with maximum Langmuir adsorption capacities reaching 20,000 μg/g and 33,333 μg/g, respectively. Of particular interest was the ability of St-DVB-g-ACE-3 to reduce all trace metal ions in industrial-grade NMP to below 1 ppb within a fixed bed column, achieving the stringent requirements for electronic-grade NMP at the G3 level. Additionally, the absorbent enhances the purity of NMP from 99.82 % to 99.84 %, indicating that the material is not dissolved and can exist stably in NMP. Its excellent recyclability and reproducibility make it highly practical for industrial use. Density functional theory (DFT) simulation, complemented by spectral analyses, revealed the interaction force and thermodynamic properties between Na and K metal ions and crown ether ring, and illustrated the interaction between anionic sulfonic group (−SO 3 − ) and metal ions. The prepared resin-grafted crown ether adsorbents are highly effective in the thorough removal of trace metal ions from NMP solution, offering a novel and effective method for the production of electronic-grade NMP.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Tianya Hu,Duan Yuan,Xiao Fu,Shuai Zhang,Fanfan Cui,Fengchen Li,Huixia Zhou,Xiaoyu Wang,Yong Hong Meng,Yurong Guo
The K + -induced pectin-based vitrimer hydrogel ink, with dynamic exchange properties, offers an innovative solution for single-channel extrusion-based 3D food printing. However, forming hydrogen-bonded cross-linked vitrimer traditionally requires over 150 mM of K + to overcome the electrostatic repulsion between enzyme-modified pectin (EMP) molecules, which raises health concerns due to the high K + content. This study developed a novel strategy to introduce Ca 2+ bridges to partially weaken the electrostatic repulsion, fabricating low-K + vitrimer gel inks. Using 67 mM K + and 0.9 mM Ca 2+ , a densely cross-linked gel (Ca-EMP-K 67 mM) was formed at 25 °C, exhibiting excellent mechanical performance (~140 g hardness). Meanwhile, the gel possessed excellent self-healing properties, with a relaxation time of 8.3 s at 80 °C, confirming its vitrimer status. Notably, the Ca-EMP-K 67 mM gel ink achieved a ~ 55 % reduction in K + doses while enabling an increase in shaping temperature from 4 °C to 25 °C, compared to the traditional EMP-K 150 mM gel ink. These advancements enabled a low-K + pectin ink for ambient 3D printing. The introduction of Ca 2+ not only reduces the K + concentration requirement but also increases the shaping temperature, broadening the gel ink's applications in the food industry.
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高影响因子
JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Yusen Li,Xiaobin Hou,Xitong Ren,Yajie Tian,Jiajie Sun,Feng Bai,Y. Li,X. Hou,F. Bai
The integration of dual active sites for concurrent oxygen reduction (ORR) and water oxidation (WOR) within a single covalent organic framework (COF) remains a fundamental challenge in the artificial photosynthesis of H 2 O 2 . To address this, we report a positional isomerization strategy that precisely engineers the substitution sites on a pyrene core, constructing four isomeric pyrene-based COFs (A-Py-COF, KA-Py-COF, AK-Py-COF, and K-Py-COF). Structure-activity studies reveal that K-region substitution is pivotal in activating the framework for efficient stepwise two-electron ORR and two-electron WOR. As a result, the optimized K-Py-COF achieves a remarkable photocatalytic H 2 O 2 production rate of 468.3 μ mol g –1 h −1 in pure water without sacrificial agents, representing a 7.8-fold enhancement over its A-Py-COF analogue. In a biphasic water-benzyl alcohol system, the H 2 O 2 production rate of K-Py-COF increases dramatically by 15.3 times, a performance that surpasses most state-of-the-art metal-free COF photocatalysts. By establishing a clear correlation between molecular isomerism and the localization of redox-active sites, this work provides a novel design principle for developing dual-channel COFs toward sustainable H 2 O 2 synthesis.
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FLUID PHASE EQUILIBRIA
·
2025
·
IF 2.7
Yanyan Hou,Zhentao Zhang,Ziyue Zhang,Yi Yu,Li Xu
The solubility of glutaric anhydride (GA) in ten single organic solvents containing methyl acetate, ethyl acetate, n -propyl acetate, butyl acetate, acetone, acetonitrile, dichloromethane, 1,2-dichloroethane, DMF, DMAC, was determined by static method. In the experimental temperature range (278.15 ∼ 313.15 K), the solubility of the measured GA in each solvent increased with the increase of temperature. Among the solvents selected, GA had the highest solubility in DMAC and the lowest solubility in butyl acetate. The solubility of GA in DMAC was about 2 ∼ 3 times higher than in butyl acetate. Solvent effects in different solvents were explained by the Hansen solubility parameter (HSP) and the physicochemical properties of the solvents (polarity, hydrogen bond donor-acceptor tendency, and cohesion energy density). The analysis of solvation effect showed that the changes of GA solubility were the results of the combined effect of multiple factors, among which the effect of solvent polarity was more significant. Based on density functional theory (DFT), the electrostatic potential energy surface and solute-solvent interaction of GA were analyzed at the molecular level. In addition, the solubility data were fitted using the van't Hoff, modified Apelblat, Yaws, λh and Wilson models. The fitting results showed that the Yaws model had the best correlation with the smallest ARD (3.74%) and RMSD (0.82%). The analysis results of the apparent thermodynamic properties indicated that GA dissolution was a spontaneous, endothermic, entropy-driven process.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Ting Liu,Li Li,Tianhao Yao,Yanni Li,Lei Zhu,Fang Li,Xiaogang Han,Yonghong Cheng,Hongkang Wang
To explore advanced anode materials with superior Li + /Na + /K + storage performances for alkaline ion batteries (AIBs), a hybrid of amorphous vanadium oxide uniformly embedded into the highly defective carbon nanofibers (denoted as VO x @CNFs) was fabricated via a facile electrospinning method followed by proper heat treatment in this work. The integrated structure synergistically combines the advantages of the amorphous VO x and the defective carbon matrices, which can not only bring abundant active sites for ion storage and multi-channels for ion diffusion, but also well accommodate the structural change induced electrode pulverization . When evaluated as anode materials for AIBs, the optimized VO x @CNFs demonstrate excellent alkaline ion storage performances with high-specific capacities, long-cycling life and high-rate capabilities, delivering a Na + storage capacity of 260 mAh g −1 at 1.0 A g −1 after 1000 cycles, a Li + storage capacity of 556 mAh g −1 at 0.5 A g −1 after 500 cycles, and a K + storage capacity of 198 mAh g −1 at 0.5 A g −1 after 400 cycles.
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