RSC Advances
·
2016
·Vol. 6
·期 59
·54020-54026
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IF 3.289
Jikuan Qiu,Yuling Zhao,Huiyong Wang,Guokai Cui,Jianji Wang
Development of new efficient catalytic systems for chemical transformation of CO2 is a very attractive topic in green chemistry. In this work, we studied the synthesis of α-alkylidene cyclic carbonates through the coupling reaction between propargylic alcohols and CO2 with new silver catalysts. It was found that activated carbon supported AgX (X = Br and I) was a simple and efficient catalyst for the carboxylative cyclization of propargyl alcohols with CO2 at atmospheric pressure and room temperature. Nearly 99% yield of the desired product was obtained, and the product could be simply separated through solvent extraction. Moreover, the catalyst could be easily recovered and reused at least ten times without a decrease in the catalytic activity and selectivity. These findings are useful for the development of an environmentally friendly chemical process for the production of α-alkylidene cyclic carbonates.
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Arabian Journal of Chemistry
·
2024
·
IF 5.3
Jie Lian,Wenyu Gong,Jianing Guo,Mingxing Wu
Construction of mesoporous structure and improving the conductivity of carbon counter electrode are feasible paths to enhance the catalytic activity in dye-sensitized solar cells (DSCs) toward the I 3 - /I - redox couple regenerating (IRR). Herein, mesoporous carbon fiber (PCf) has been first synthesized and the DSCs using PCf counter electrode results in a power conversion efficiency (PCE) of 7.12%, significantly surpassing the PCE of 6.01% generated by the DSCs with carbon fiber (Cf) counter electrode without mesoporous structure. Additionally, doping with heteroatoms B or N can further enhance the catalytic performance of PCf. Consequently, B or N doped Cf (BPCf or NPCf) counter electrode-based DSCs achieve high PCE values of 8.43% and 7.96%, respectively, demonstrating PCE improvements of 40.3% and 32.4%. This enhancement in catalytic activity for IRR in DSCs can be first attributed to the increased specific surface area of Cf which can provide more catalytic activated sites. Meanwhile, the enhanced conductivity of PCf by heteroatoms B or N doping is also an important factor for the improved catalytic activity. This work is expected to provide potential path to enhanced the catalytic activity of carbon counter electrode in DSCs toward IRR.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Zhen Tian,Yiyang Li,Lina Wang,Rui Xu,Aihua Wei,Jun He,Chengjun Wang
An innovative technology for the removal of phenolic and non-phenolic organic pollutants from aqueous solution was developed by combining UV 254 irradiation, peroxymonosulfate (PMS), and iodide ions (I − ). Effects of pH, ratio of [I − ]/[PMS], initial concentration of pollutant, dissolved organic matter (DOM) and typical inorganic constituents of environmental water on the degradation of studied pollutants with UV 254 /PMS/I − system were examined. The results showed that pH and [I − ]/[PMS] exhibited significant impact on the degradation of pollutants during UV 254 /PMS/I − process. As the ratio of [I − ]/[PMS] increased from 0.1 to 10.0, the removal efficiencies of phenolic pollutants remarkably increased, but those of non-phenolic pollutants decreased. The DOM at high concentration obviously inhibited the degradation of pollutants during UV 254 /PMS/I − process. Meanwhile, the occurrence of NO 3 − can slightly enhance the degradation of pollutants, and SO 4 2− , Cl − , and HCO 4 − ions had no significant effects on UV 254 /PMS/I − system. The abundant reactive species including OH, SO 4 − , and I /I 2 − during UV 254 /PMS/I − process were generated based on electron spin resonance, fluorescence spectroscopy and steady-state concentration analysis. Quenching experimental results indicated that I /I 2 − can selectively degrade phenolic pollutants via one-electron oxidation. This study provided a reference for the application of reactive radicals involved oxidative technique in water purification .
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COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Lijiaqi Zhang,Yong Huang,Min Wu
Due to the excellent properties of nanocellulose film such as biodegradability and renewability, researchers have conducted in-depth research on it in recent years. However, rich hydroxyl groups on the surface of nanocellulose make it hydrophilic , and small gaps between the fibrils have significant capillary effect, which cause the strength of nanocellulose film drastically deteriorates when exposed to water, severely restricting its scope of use. In this study, the nanocellulose prepared by ball milling was used to prepare nanocellulose film, and the surface of the film was partially dissolved by ZnCl 2 . The dense regenerated cellulose (Cellulose Ⅱ) with Zn 2+ on the surface made the film hydrophobic, effectively reduced the water absorption rate of the film, and also maintained the internal structure of the nanocellulose. Through this strategy, the nanocellulose film with high dry strength (151–176 MPa), wet strength (27.6–31.7 MPa), high light transmittance (80–91%), and adjustable haze (50–90%) was obtained. This study provides a facile and environmentally friendly strategy to improve the wet strength of nanocellulose film, which broadens its application prospect in packaging materials and electronic devices.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 52
·2411183
·
IF 18.5
Song Yin,Xuewei Jiao,Xudong Liu,Mingxuan Liu,Bingshun Xu,Na Li,Yonghao Lu,Shaopeng Yang,Weiguang Kong
The role of MA in FAMA mixed perovskite remains far from being fully understood, due to the intricate chemical evolutions in the precursor solutions. Adjusting the content of MA in FAMA mixed perovskite arbitrarily remains a great challenge. This study elucidates a synergistic effect between H + and I − oxidation which helps to reduce the content of MA in FA-dominated perovskite. Briefly, excessive H + boosts the balanced and rapid assembly of MA and FA components in FA-dominated perovskite and hampers unfavorable chemical evolution induced by nucleophilic reaction between MA and FA in the precursor solution, while I − oxidation accelerates the in situ crystallization of perovskite. Leveraging this synergistic effect, centimeter-scaled FA x MA (1-x) PbI 3 single crystals with arbitrarily adjustable values of x are successfully fabricated. In addition, peroxyacetic acid is introduced as the additive, enabling the blade-coated FA 0.9 MA 0.1 PbI 3 perovskite solar cells (PSCs) to achieve an impressive efficiency of 23.7%. The efficiency achieved here is among the highest values for blade-coated PSCs with FA content exceeding 90% so far. The optimized solution developed in this study achieved exceptional stability, allowing it to be stored under air conditions for over 2 months without significant degradation in cell efficiency. This outcome satisfies the requirements for commercialization.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Xiaoyi Pan,Hongyan Si,Yongqi Zhang,Hanyue Huang,Suhua Yuan,Wuxiong Wang,Wenjing Yuan,Ji Zhang,Jie Song,Shangxing Chen,Shengliang Liao,Zongde Wang
The citral-based acylthiourea derivative e14 was identified as a potent synergist for chlorothalonil (CT) against Colletotrichum fructicola. The optimized mixture (ECS, 25% e14) exhibited strong synergistic activity (synergistic ratio (SR) = 2.30), significantly enhancing disease control efficacy while enabling reduced fungicide dosage. Mechanistic studies revealed that e14 specifically targets mitochondrial complex I by binding to the NADH dehydrogenase subunit 5 (ND5), thereby disrupting oxidative phosphorylation and inducing energy depletion and oxidative stress. This distinct mode of action differs from that of CT, minimizing the risk of cross-resistance. Importantly, e14 exhibits low mammalian cytotoxicity. This study elucidates the synergistic mechanism of ECS and the enhancing role of e14, thereby providing a solid foundation for the development of effective fungicide synergists.
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PubMed
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Tong Liu,Jiahao Li,Qinqin Yu,Pengkun Zheng,Yao Liu,Shaoyang Tao,Haoming Wang,Min Zhou,Haobo Hou
Thallium (Tl) is a highly toxic rare element. The selective and efficient removal of Tl(I) from water is critical for water safety, yet remains a significant challenge. Herein, a series of highly effective adsorbents with coordination/ion-exchange sites have been developed for Tl(I) removal through composite modification of zeolites via potassium ion exchange and crown ether loading. Within 1 min, 99.42 % of Tl(I) could be removed by 18C6@K-4 a, and the maximum adsorption capacity derived from the sips isotherm model reached 1199.01 mg·g −1 . The adsorption process of Tl(I) was determined to be spontaneous and exothermic based on thermodynamic studies. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations were employed to elucidate the adsorption mechanism and propose optimized adsorption configurations. Both control experiments and computational results consistently demonstrated that the enhanced performance can be attributed to the synergistic effect between exchangeable K + and crown ether complexation, wherein 18-crown-6 captures Tl + through coordination, while K + /Tl + cation exchange contributes to the selectivity and rapid adsorption kinetics. This study offers a straightforward strategy for modifying thallium adsorption materials, which operates under mild conditions, generates no hazardous waste, and leads to significantly improved Tl(I) adsorption performance along with high reusability of the material
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xuan Ma,Xudong Zheng,Xi Zhang,Youming Zhu,Lin Guo,Jingbo Sun,Jinfeng Mei,Jian Rong,Zhongyu Li
137 Cs and 131 I exhibit pronounced radiotoxicity, prolonged environmental persistence, and high mobility, posing dual threats to ecosystems and human health. The simultaneous removal of Cs + and I − using a single adsorbent is an area of growing research interest. In this study, a rationally designed dual-imprinted membrane (IPA-MC) was engineered via electrospinning and ion-imprinting technology for selective cesium and iodine adsorption. Crosslinking of zwitterionic polyethyleneimine-acrylic acid (PEI-AA) yielded hierarchical porous structures, which enhanced adsorption selectivity and capacity. Optimal adsorption performance occurred at pH 6.0, and its adsorption kinetics followed the pseudo-second-order model, indicating that chemical adsorption was the dominant mechanism mechanisms. IPA-MC maintained efficient and selective adsorption in the presence of interfering ions and demonstrated excellent regeneration capacity. Synergistic amino-carboxyl interactions enhanced adsorption for Cs + and I − , with particularly high efficiency for iodine removal. This work demonstrates an effective strategy for the selective extraction of nuclides using composites through multiple interactions. These composites show significant potential for radioactive wastewater treatment applications.
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ANALYST
·
2025
·
IF 3.3
Qing Xiang,Hao Wang,Shengdong Liu,Yilong Zheng,Shipan Wang,Huanhuan Zhang,Yonggang Min,Yuguang Ma
Acute myocardial infarction (AMI) is a severe cardiovascular disease, for which early diagnosis is critical for reducing mortality and improving patient outcomes. Cardiac troponin I (cTnI) is widely recognized as the “gold standard” biomarker for AMI due to its high specificity and sensitivity. The concentration of cTnI correlates directly with different stages of AMI. Therefore, the accurate detection of cTnI concentration is of paramount importance. However, the low concentration of cTnI in biological fluids requires ultrasensitive detection methods. In this study, we developed a sandwiched surface enhanced Raman scattering (SERS)-based biosensor composed of SERS-immune substrate, target antigen, and SERS nanotags and realized sensitive and accurate detection of cTnI. The SERS-immune substrate features an ordered, multi-tipped monolayer of Au nanostars fabricated using a three-phase interfacial self-assembly method and 4-(2-hydroxyerhyl)piperazine-1-erhanesulfonic acid (HEPES) buffer modification. Compared to Au nanosphere SERS substrates, the Au nanostar SERS substrates exhibited about a 3-fold increase in Raman enhancement and demonstrated good uniformity and batch stability. This novel SERS detection platform, leveraging dual plasmonic enhancement from both the SERS-immune substrate and SERS nanotags, achieves detection of cTnI with a limit of detection (LOD) as low as 9.09 pg/mL and a relative standard deviation (RSD) as low as 11.24%. Thus, the Au nanostar SERS substrates developed in this study demonstrate significant potential for rapid and accurate detection of cTnI.
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BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2021
·Vol. 94
·期 8
·2133-2138
·
IF 5.488
Zheng Ming-Xin,Yao Chan,Xie Wei,Xu Yan-Hong,Hu Hui
Mercury is a toxic substance that is harmful to human health and the environment. It is a great challenge to overcome the pollution of mercury via designing suitable adsorbent decorated with abundant chelating sites on a solid surface together with high affinity for heavy metals. Herein, we employed a flexible building block 4,4′-dithiodianiline as a connector, and together with tetraphenylethylene tetraaldehyde to construct a periodic 3D extended framework with bright green-yellow luminescence (TPE-S-COF), in which the active sites of sulfur are uniformly distributed in pore walls. This allows TPE-S-COF to be used as a sensitive chemosensor to selectively detect toxic mercury ions; and has an adsorption capacity of 48 and 42.4 mg g−1 for Hg+ or Hg2+, respectively. More interestingly, the detection performance of TPE-S-COF towards mercury ions can be directly observed by the naked eye. And, it can be reused without loss of sensitivity and responsiveness.
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RSC Advances
·
2020
·Vol. 10
·期 65
·39814-39821
·
IF 3.119
Xin Min,Changchao Zhan,Ping Yan,Zhigang Ye
A novel hydroxyl-terminated π-allyl nickel initiator [η3-Ni(CH2CHCHCH2OCOCH3)][BPhF4] is synthesized for the first time. 1H-NMR analysis confirms that the Ni initiator possesses a typical π-allyl structure with a protected hydroxyl group. The Ni initiator is applied to synthesize hydroxyl-terminated poly(3-hexylthiophene). It successfully initiates the homopolymerization of thiophene, and yields narrow molecular weight distribution, hydroxyl-terminated poly(3-hexylthiophene). Moreover, it is found that [η3-Ni(CH2CHCHCH2OCOCH3)][BPhF4] has high initiating activity in the polymerization of styrene and butadiene. A hydroxyl-terminated polybutadiene-b-poly(3-hexylthiophene) block copolymer is synthesized by using [η3-Ni(CH2CHCHCH2OCOCH3)][BPhF4] to improve the workability and brittleness of poly(3-hexylthiophene).
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Jiao Sha,Di Fan,Jingyi Zhang,Zidan Cao,Yameng Wan,Renren Sun,Haixia He,Gaoliang Jiang,Yu Li,Tao Li,Baozeng Ren
The equilibrium solubility of nimesulide (NIMS) in twelve single solvents was accurately measured by a laser monitoring method. It was indicated that the positive impact of experimental temperature on the solubility data of NIMS (Form I) in twelve mono-solvents within the investigated temperature range of 278.15–323.15 K under 101.3 KPa. The solubility shows a clear non-linear trend and decreased in the order methyl acetate > ethyl acetate >2-methoxyethanol > n-propyl acetate > n-butyl acetate >2-ethoxyethanol >2-propoxyethanol >2-butoxyethanol > methanol > ethanol > n-propanol > n-butanol. NIMS (Form I) has the highest solubility ( x 1 = 5.223e-2) in methyl acetate at 323.15 K and the smallest solubility ( x 1 = 6.800e-6) in n-butanol at 278.15 K. And then, the solvent polarity, radial distribution function obtained from molecular dynamic simulation and solvent effect (KAT-LSER model) were implemented to investigate the effect of solute-solvent interactions on solid-liquid phase equilibrium of NIMS (Form I). The results demonstrated that the whole dissolution behavior of NIMS (Form I) in organic solvents was a complicated process, and the solvent-solute interactions are mainly affected by the dipolarity/polarizability. Moreover, five widely used activity coefficient models including NRTL, NRTL-SAC, Wilson, Two-Suffix Margules, and UNIQUAC models had been fitted to experimental solubility data. Deviation analysis reveals that the UNIQUAC model reflects the best agreement between the measured data and calculated values, with the minimum mean values of 100ARD (0.89) and RMSD (1.22e-4). Finally, the thermodynamic parameters (Δ dis G o , Δ dis H o , Δ dis S o , ζ H and ζ TS ) of NIMS (Form I) dissolution process in investigated 12 single solvents were evaluated based on the van't Hoff equation. The positive Δ dis G o , Δ dis H o and Δ dis S o indicate that the dissolution process of NIMS (Form I) is an entropy-driven non-spontaneous endothermic process in all chosen single solvents, and the ζ H is the main contributor of Δ dis G o .
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