POLYMER INTERNATIONAL
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2017
·Vol. 66
·期 12
·1891-1896
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IF 2.07
Yongjie Zhang,Xiaopei Li,Shuwei Wang,Jing Xu,Huayi Li
Organo-modification of montmorillonite (MMT) is crucial for the promotion of a fine dispersion of MMT into an (often hydrophobic) polymer matrix. Ammonium-terminated polymers are more efficient in modifying clay compared to small organic cations such as alkyl ammoniums or side functionalized polymers. Herein, tri-amino end functional polyethylene (PE-3 N) with low molecular weight was first synthesized via an efficient and robust epoxide ring-opening reaction by treating epoxide-terminated PE with diethylenetriamine. The chemical structure of PE-3 N was unambitiously characterized by chromatographic and spectral methods. By reacting with excess HCl, PE-3 N was subsequently converted to tri-ammonium end functional polyethylene (PE-3 N + ), which serves as an intercalation agent of MMT. By adjusting the weight ratio of PE-3 N + to pristine MMT ( R P/M ) applied in the static melt intercalation process, correlations between the extent of exfoliation and R P/M were successfully established. XRD results revealed that complete exfoliation of MMT could be afforded with R P/M as low as 1, which is the lowest value ever reported for ammonium-terminated polymers applied as intercalation agents. SEM micrographs showed that MMT sheets were swollen by PE-3 N + , affirming the successful modification of MMT. The PE modified MMT obtained may find application in preparing high-performance PE/MMT nanocomposites. © 2017 Society of Chemical Industry
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DESALINATION
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2025
·
IF 9.8
Huifang Li,Yu Yue,Xiao Wang,Dahuan Liu
Solvent extraction has emerged as an extremely effective and highly promising approach for extracting lithium ions from salt lake brine, primarily due to its remarkable Li + selectivity, cost-effectiveness, and high efficiency. In this paper, the utilization of bis-(2,4,4-trimethylpentyl)-phosphinic acid (Cyanex 272) as an iron-fixed reagent in an organic solution, along with tributyl phosphate (TBP) as the extractant and FeCl 3 as the co-extractant, is proposed. Compared to the traditional TBP-FeCl 3 system, TBP-Cyanex 272 extraction system holds potential advantages in terms of a more environmentally friendly extraction process. Particularly, during the stripping process, the coordination of Fe 3+ with Cyanex 272 and TBP at a lower Cl − concentration allows Fe 3+ to be retained in the organic phase, thereby facilitating a greener extraction process. This method has effectively overcome the technical challenges associated with TBP-FeCl 3 systems, such as strong acid stripping and strong base saponification. Additionally, as an environmentally friendly extraction system, TBP-Cyanex 272 demonstrates exceptional performance in terms of lithium extraction efficiency and phase separation.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yongyan Yang,Ying Ma,Jingfei Wang,Ruiting Zhang,Meiyi Wu,Shuangling Zhong,Wenqi He,Xuejun Cui
As a new type of wound dressing, hydrogels have attracted more and more attention. However, traditional hydrogel wound dressings lack inherent antibacterial properties and are difficult to match irregular wounds, which leads to an easy wound bacterial infection. To solve the problems associated with traditional hydrogels, in this research, a thermosensitive hydrogel (PFLD) for wound dressings was developed based on Poloxamer 407 (PF127), lysine (Lys), and 3,4-dihydroxyphenylacetic acid (DOPAC). Rheological tests indicated that the PFLD hydrogel possesses injectability, adaptability to deformation, and sufficient mechanical strength for wound dressing applications. In addition, it could in situ gel at 33 °C, which indicated that the hydrogel could undergo sol-to-gel transition under body temperature. Upon using it in wound treatment, it could adapt to irregular wounds to achieve full coverage of the wound and promote the rapid hemostasis of wound bleeding. Due to the presence of DOPAC in the hydrogel, it exhibited excellent antibacterial and antioxidant properties on the wounds. The skin defect model showed that the wound shrinkage was the fastest after PFLD hydrogel treatment. On day 14, the wound shrinkage rates were 81.68 and 99.77% for the control and PFLD hydrogel groups, respectively. Therefore, the PFLD hydrogel has a broad application prospect as a dressing for the treatment of irregular wounds.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Ting-Ting Li,Meng-Meng Xie,Hong-Yang Wang,Jun-Sheng Wang,Jia-Horng Lin,Ching-Wen Lou
It is a challenge to effectively degrade phenanthrene (PHE) pollutants, which are widely present in aquatic environments, in order to reduce harm to humans and ecosystems. In this study, an S-scheme TiO 2 /g-C 3 N 4 photocatalytic system is constructed using 0D TiO 2 nanospheres and 2D g-C 3 N 4 nanosheets for the removal of PHE from water under sunlight irradiation. The effects of irradiation time, quality ratio of TiO 2 to g-C 3 N 4 , and cycle time on the performance of the TiO 2 /CN photocatalyst are investigated. The experimental results show that the ratio of TiO 2 to g-C 3 N 4 significantly affects the photocatalytic activity of the photocatalyst. Under the optimal ratio of TiO 2 to g-C 3 N 4 (50 % TiO 2 /CN), the apparent reaction rate constant for phenanthrene reached 0.00796 min −1 , which is 11.5 times higher than that of pure TiO 2 (0.00069 min −1 ). The tests of optical performance and photoelectrochemical properties further confirmed that the construction of the TiO 2 /g-C 3 N 4 S-type photocatalyst successfully enhanced the spatial separation efficiency of photogenerated carriers and ensured a continuous supply of energy during the redox reaction process. Converting highly toxic phenanthrene into a non-toxic green degradation product provides an practical strategy for the safe treatment of PHE in aqueous environments through the use of visible-light-driven heterojunction photocatalysts. Additionally, the data collected on phenanthrene degradation in this study will provide valuable references for developing degradation methods for other PAHs, such as naphthalene, anthracene, and pyrene.
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ChemNanoMat
·
2024
·Vol. 10
·期 7
·e202400134
·
IF 2.6
Xiaoqian Yao,Feng Teng,Tao Yang,Peng Hu
Over the past few decades, the overuse of antibiotics has raised concerns about drinking water and potential health risks, especially the hydrochloride tetracycline (TC-HCl). Therefore, it is crucial to develop a simple, low-cost and high-efficiency photocatalyst for the degradation of the pollutant. A novel photocatalyst with an S-scheme heterojunction structure of AgIn 5 S 8 and Bi 2 MoO 6 was synthesized by using a solvothermal method. The heterojunction photocatalyst obtained demonstrates superior photocatalytic degradation activity for hydrochloride tetracycline (TC-HCl) under visible light irradiation. It exhibits higher photocatalytic degradation performance than pure AgIn 5 S 8 and Bi 2 MoO 6 under the same conditions. The heterojunction with 3 % AgIn 5 S 8 exhibited the highest degradation efficiency of 63.65 % within 40 minutes. Furthermore, the degradation rate is 6.21 times higher than that of AgIn 5 S 8 and 2.18 times higher than that of Bi 2 MoO 6 . The improved photocatalytic activity is primarily attributed to the enhanced light absorption and the high rate of carrier separation resulting from S-scheme heterojunctions.
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ANALYTICAL SCIENCES
·
2024
·
IF 1.8
Cai Tongji,Chen Meilun,Yang Jie,Tang Chunhua,Lu Xiaoling,Wei Zheng,Jiang Hanbing,Hou Yucui,Zhao Jia,Yu Peng
Abstract Vitamin D 3 (VD 3 ) is the main form of vitamin D and an essential nutrient for maintaining human life. Currently, traditional methods for detecting 25-hydroxyvitamin D3(25(OH)D 3 ) are complex and expensive. In this study, we constructed an accurate, sensitive, simple, and cost-effective label-free biosensor based on an aptamer for the detection of 25(OH)D 3 . The aptamer-modified sulfhydryl adopted self-assembly as a way to stably immobilize at the glassy carbon electrode (GCE) surface modified by gold nanoparticles (AuNPs). Upon 25(OH)D 3 binding to the aptamer, the complexes inhibit electron transfer at the electrode surface, leading to reduced [Fe(CN) 6 ] 3−/4− redox peak current. Consequently, the quantity of 25(OH)D 3 that interacts with the electrode-bound aptamer correlates with the observed electric current response values. The Aptamer/AuNPs/GCE aptasensor achieved direct and highly sensitive detection of 25(OH)D 3 over a wide concentration range (1.0–1000 nM), with a limit of detection of 1.0 nM. At the same time, other molecules with a similar structure, such as 25(OH)D 2 , Vitamin D 3 , and Vitamin D 2 , had lower response interference than 25(OH)D 3 . Therefore, this biosensor has great potential to become a portable diagnostic device for 25(OH)D 3 . Graphic abstract
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Chuanxi Zhao,Baoyuan Li,Kai Chang,Xin Zhang,Heng Xu,Dongyang Qiu,Qin Wang,He Miao
The Zn electrode in the alkaline Zn-MnO 2 batteries is suffered from the self-corrosion and hydrogen evolution, which deteriorates their discharge performance and storage life. To address these issues, this work proposes a low-cost and effective phosphate ester-containing organic additive, coconut oil alkyl alcohol amide phosphate ester (DG6503), for the alkaline electrolyte of the Zn-MnO 2 batteries. The phosphate ester groups in DG6503 can form a complex precipitate coating on the surface of Zn, and efficiently decrease H 2 evolution rate of the Zn electrode by over 90 %. DG6503 also can suppress the formation of nanoneedle ZnO products during the discharge of Zn-MnO 2 batteries. Therefore, the discharge capacities of the alkaline Zn-MnO 2 batteries can be greatly improved under the various discharge conditions before and after long-term storage. Our work provides a promising method for improving the discharge property and storage life of the alkaline Zn-MnO 2 batteries.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Siqi Cai,Dejun Li,Fang Luo,Zhenyu Lin,Aiwen Huang,Bin Qiu
In this work, an electrochemiluminescence (ECL) biosensor for T-2 toxin detection has been designed by combining the high specificity of a DNA hydrogel system with the convenience and sensitivity of homogeneous ECL detection. Specifically, A hydrogel was engineered through the reaction between the carboxyl group of hyaluronic acid (HA) and the amino groups of both polyethyleneimine (PEI) and DNA-modified strands, resulting in a three-dimensional network that encapsulates glucose oxidase. Glucose oxidase (GOD) is capable of catalyzing the conversion of glucose into hydrogen peroxide (H₂O₂), which is a co-reactant necessary for the chemiluminescent reagent luminol to emit light. Upon the presence of the target analyte T-2 toxin, the aptamer recognizes and binds to it, leading to the dissociation and cleavage of the hydrogel framework. This process results in the leakage of the encapsulated GOD into the supernatant. Subsequently, Adding the collected supernatant to a phosphate-buffered saline (PBS) solution containing glucose and luminol for ECL testing yields a noticeable signal change. This sensor eliminates the need for electrode modification, simplifying the operation. Within a concentration range of 10 fg/mL to 100 ng/mL, the ECL signal intensity exhibits an excellent linear relationship with the logarithm of the target concentration, with a detection limit as low as 0.32 fg/mL. The method also demonstrates excellent reproducibility and stability. The sensor demonstrated precise detection capabilities in actual milk and beer samples, a crucial aspect for research focused on specific targets.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Haijun Du,Dexiang Wang,Yu Duan,Minkang Hu,Shengnan Li,Wen Yang,Jun Feng
Since exogenous plant hormones are often employed in agriculture, it is necessary to build a sensitive electrochemical sensor to monitor their residues. This paper describes a flower-like tin disulfide (SnS 2 ) flakes using a hydrothermal method, was loaded onto a carbonized eggshell membrane (CESM). The SnS 2 /CESM composite was subsequently drop-coated onto a glassy carbon electrode (GCE), resulting in the successful construction of an electrochemical sensor (SnS 2 /CESM/GCE) for the detection of maleic hydrazide (MH). The designed sensor demonstrates a wide linear range of 0.1 ∼ 25 µM and 25200 µM, and a low detection limit of 0.0386 µM. Mechanistic studies indicates the electrochemical reaction of MH on SnS 2 /CESM/GCE is controlled by adsorption, which two protons and two electrons are participated in the electrochemical oxidation process. The proposed sensor demonstrated good repeatability and reproducibility, with relative standard deviations (RSDs) of 3.83 % and 2.39 %, respectively. Common interferences had no effect on the detection of MH, with an RSD of 3.16 %. The spiking recovery approach yielded recoveries of MH in tobacco ranging from 94.60 % to 107.60 %. This suggests that the SnS 2 /CESM/GCE sensor has a promising future in agriculture for the quick detection of exogenous phytohormones.
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Frontiers in Chemistry
·
2024
·
IF 3.8
Zhang Lizhong,He Mingyi,Xu Yang,Guo Cuixia,Zhou Chongqi,Guan Tian
An ultra-sensitive phase plasmonic sensor combined with weak value amplification is proposed for the detection of IgG, as a model analyte. Phase detection is accomplished by self-interference between the p-polarization and the s-polarization of the light. With the principles of weak value amplification, a phase compensator is used to modulate the coupling strength and enhance the refractive index sensitivity of the system. On a simple Au-coated prism-coupled surface plasmon resonance (SPR) structure, the scheme, called WMSPR, achieves a refractive index sensitivity of 4.737 × 104 nm/RIU, which is about three times higher than that of the conventional phase-based approach. The proposed WMSPR biosensor gives great characteristics with a high resolution of 6.333 × 10−8 RIU and a low limit of detection (LOD) of 5.3 ng/mL. The results yield a great scope to promote the optimization of other SPR biosensors for high sensitivity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhen Chen,Ziqi Zhang,Yixin Yu,Yu Guo,Jing Liu,Zhiling Zhu
A universal theory for predicting the catalytic activity of hydrolytic nanozymes has yet to be developed. Herein, by investigating the polarization and hydrolysis mechanisms of nanomaterials towards amide bonds, carbocation charge was identified as a key electronic descriptor for predicting catalytic activity in amide hydrolysis. Through machine learning correlation analysis and the Sure Independence Screening and Sparsifying Operator (SISSO) algorithm, this descriptor was interpreted to associate with the d-band center and Lewis acidity on the nanomaterial surface. On this basis, copper nanoparticles (Cu NPs) were discovered to exhibit significant hydrolytic activity. Further, peptidomic analysis and molecular dynamics simulations showed that Cu NPs demonstrated substrate selectivity. In the presence of water molecules, hydrophobic amino acid residues were driven towards the nanomaterial surface by hydrophobic groups of proteins, leading to the preferential hydrolysis of peptide bonds linked to these residues. This study provided a theoretic framework for predicting highly efficient hydrolytic nanozymes with broad potential applications.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Changmei Lin,Zhenhao Pei,Jun Chen,Jinxin Lan,Hai Huang,Xiaojuan Ma,Shilin Cao
Tactile sensors are an important area in developing electronic skins and human–machine interfacing. Herein, we reported an eco-friendly cellulose paper based tactile sensor driven by a triboelectric nanogenerator (TENG). Enabled by the surface modification of polymethylhydrosiloxane (PMHS) and polypyrrole (PPy), the triboelectric negative performance and conductivity of cellulose paper were improved; therefore, the modified cellulose paper could be applied to the triboelectric negative material and electrode for TENG. At the contact and separation mode (CS mode), the short-circuit current (ISC), open-circuit voltage (VOC), and power density of the corresponding device were improved to 0.52 μA, 11.6 V, and 736.9 μW/m2. In addition, a single-electrode TENG based on this modified cellulose paper was also obtained by pairing it with human skin. The results indicated that this single-electrode TENG could generate a voltage of 23.8 V, current of 1.1 μA, and surface charge of 4.3 nC. Meanwhile, a tactile sensor for written stroke recognition based on the single-electrode TENG was also demonstrated.
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