IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Yunjie Cao,Xijie Feng,Wenbo Sui,Yufei Shi,Zihan Xie,Xinyan Xian,Jun Wu,Jun Zhou,Jie Dong,Changyu Shen
Mercury is a toxic heavy metal that can easily cause serious harm to human health and the environment. To quickly and sensitively measure the concentration of mercury ions (Hg
2+
), a fiber optic sensor based on Polyacrylamide/2-Thiophenecarboxaldehyde(PAM-TH)-functionalized Mach-Zehnder interferometer (MZI) is proposed and demonstrated experimentally. The prepared modified polyacrylamide and 2-Thiophenecarboxaldehyde are combined by Schiff base reaction to form a three-dimensional network hydrogel with specific binding properties for Hg
2+
. The ultra-sensitive Hg
2+
detection is realized by coating hydrogel on the surface of highly sensitive MZI based on polarization maintaining photonic crystal fiber. The experimental results verify a limit of detection of approximately 0.87 fM, which is two orders better than that of the reported fiber-based Hg
2+
sensors. Through the desorption of mercury ions in the sensor film by ethylenediaminetetraacetic acid (EDTA), the proposed sensor demonstrates good reusability under a wide dynamic detection range from 0.01 pM to 10 nM.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Yunping Zhoujin,Xing Yang,Mingtao Zhang,Ju Guo,Sean Parkin,Tonglei Li,Faquan Yu,Sihui Long
A lactam–lactam dimer (LLD) and lactam NH···O═C (amide) catemer (LAC) are two competing motifs in N-phenyl-2-hydroxynicotinanilides (PHNAs). Steric effects play an important role in determining the outcome of this competition, and in general, PHNAs with no or negligible steric hindrance take on a near-planar conformation and form LLDs, rather than the widely observed amide NH···O═C hydrogen-bond chains. Conversely, those with significant steric hindrance are forced to take on a twisted conformation and form a lactam NH···O═C (amide) hydrogen bond. Nevertheless, steric factors are not the only criteria, as an LLD and an LAC have been observed in the two polymorphs (1-I and 1-II) of 2-hydroxy-N-m-tolyl-nicotinamide (namely 2-oxo-1,2-dihydropyridine-3-carboxylic acid m-tolylamide, compound 1), although the molecules in both forms have a nearly identical conformation, in contrast to five other newly synthesized PHNAs (2–6), whose crystal structures are sustained on the LLD. Thus, synthon polymorphism is possible in conformationally planar PHNAs. Theoretical studies were performed to provide an explanation for this observation. The lattice energies of the two forms of 1 showed only an insignificant difference. A Hirshfeld analysis revealed that the loss of stability due to less hydrogen bonding in 1-II is compensated by the participation of π–π stacking. Other than the commonly observed LLD in the crystals, π–π stacking provides a significant stabilization for each crystal, with its particular effects being dependent on the substitution pattern of the compound. A noncovalent interaction (NCI) analysis further provided a visual demonstration of the important intermolecular interactions. Potentially the other planar compounds could behave in a similar manner.
研究领域:
晶体学
·
理论化学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 3
·219
·
IF 4
Xuan Han,Chao Guo,Hui Wang,Weijuan Xu,Qinlian Liu,Qingshan Zhao,Mingbo Wu
Hydrogen production from water electrolysis offers a highly promising and sustainable route to solve the energy crisis. However, it is severely limited by the sluggish kinetics of the oxygen evolution reaction (OER) occurring on the anode. Herein, employing carbon dots functionalized with benzene sulfonate groups (BS-CDs) as a distinctive inductor, a Co(OH)2catalyst featuring abundant defects was synthesized for an enhanced OER. The highly hydrophilic nature of BS-CDs exerts a significant interfacial induction effect on the growth dynamics of Co(OH)2, fostering the formation of elevated crystal defects and a substantial quantity of oxygen vacancies. The resulting BS-CDs/Co(OH)2catalyst requires an overpotential of only 340 mV to achieve a current density of 10 mA cm−2in alkaline media, demonstrating markedly improved OER activity compared to pristine Co(OH)2and N-CDs/Co(OH)2induced by amine-modified CDs. Furthermore, the structural integrity of the catalyst is maintained, with a current retention rate of 92% observed following a 20 h stability assessment. This work provides a novel approach for developing cost-effective transition metal catalysts that exhibit exceptional catalytic efficiency and excellent stability for the OER.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Qi Dang,Jiani Chen,Tianbao Li,Long Liu,Tianzeng Huang,Chunya Li,Tieqiao Chen
A palladium-catalyzed decarbonylative annulation of 2-arylbenzoic acids with internal alkynes via C(sp2)–H activation has been developed. A series of phenanthrenes were produced in moderate to good yield with good functional group tolerance. The mechanism study indicated that the C(sp2)–H activation should be the rate-determining step during the reaction.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Chaoran Li,Zanyong Zhuang,Feng Huang,Zhicheng Wu,Yangping Hong,Zhang Lin
Treatment of wastewater containing low-concentration yet highly-expensive rare earth elements (REEs) is one of the vital issues in the REEs separation and refining industry. In this work, the interaction and related mechanism between self-supported flowerlike nano-Mg(OH)2 and low-concentration REEs wastewater were investigated. More than 99% REEs were successfully taken up by nano-Mg(OH)2. Further analysis revealed that the REEs could be collected on the surface of Mg(OH)2 as metal hydroxide nanoparticles (<5 nm). An ion-exchange model was proposed as a critical factor for both guaranteeing the reaction speed and maintaining the self-supported structure of the materials. In addition, a method was developed to further separate the immobilized REEs and the residual magnesium hydroxide by varying the solution pH. In a pilot-scale experiment, the REEs from practical wastewater were immobilized effectively at a high flow rate. We anticipate this work can provide a good example for the recycling of valuable REEs in practical industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Zhuojun Jiang,Yufeng Liang,Shuyao Xiong,Guo Li,Qian Zhang,Benzheng Xia,Liangrong Yang,Zheng Li
A synergistic solvent extraction system comprising trioctylamine (TOA) and ligands with hydroxyl and carboxyl groups can efficiently recover boric acid (H 3 BO 3 ) and separate boron isotopes. However, the structure of ligands might impact H 3 BO 3 extraction, boron isotope separation, and solvent loss, which has not been thoroughly investigated. This study initially evaluated the influence of ligand’s type, p K a , and substituents on H 3 BO 3 extraction efficiency, as well as the impact of the B (4) -O structure (boron is bound to four oxygen atoms) in the organic phase on isotope separation efficiency. Subsequently, by synthesizing the highly hydrophobic 2-hydroxydodecanoic acid (HYA), the extraction performance and mechanism of the TOA/HYA system were investigated. The findings highlight the superior extraction efficiency when employing di-phenolic hydroxyl, phenolic hydroxyl + carbinol hydroxyl, and alcoholic hydroxyl + carboxyl ligands compared to phenolic hydroxyl + carboxyl, phenolic hydroxyl + ethanol hydroxyl, diol hydroxyl, and dicarboxylic ligands. The organic phase anion complex, exclusively comprising the B (4) -O structure, enhances isotope separation effectiveness. The TOA/HYA system achieves an 80% single-stage extraction efficiency for H 3 BO 3 . H 3 BO 3 and HYA are extracted into the organic phase at a ratio of 1:2, with the anion complex solely containing the B (4) -O structure. This study paves the way for the construction of novel boric acid extraction and boron isotope separation systems.
研究领域:
化学工程
·
核化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yetong Li,Kailong He,Siyuan Zhao,Linyu Jiao,Huiyong Chen,Xiaoxun Ma,Chengyi Dai
Many researchers have extensively studied the alkylation of naphthalene with methanol for the preparation of high-value-added chemicals, especially methylnaphthalenes (MNs). Studies indicated that methanol generates a large number of methanol-to-olefin by-products on zeolites, resulting in low selectivity of the target product and poor stability of the catalyst, limiting its application in the industrial field. In this study, CO 2 hydrogenation was coupled with naphthalene alkylation, and the H 3 CO* active intermediate generated in situ was alkylated with naphthalene by using metal oxide-zeolite (OX-ZEO) bifunctional catalysts, which exhibited the ‘slow release’ phenomenon of the methylation reagent. It improved naphthalene conversion, suppressed deep alkylation and coke deposition side reactions and kept the catalyst stable for up to 500 h. A high-density and medium-strength Brønsted acid center facilitated the efficient migration of H 3 CO* active intermediates with the desorption of 2-methylnaphthalene (2-MN), which was particularly important for improving naphthalene conversion and 2-MN selectivity. The in situ IR showed that more Brønsted acid sites of Ga-S-1 effectively pulled the migration process of H 3 CO* species to the zeolitic acid center and increased the efficiency of C-C coupling compared to ZSM-5, which promoted the alkylation of H 3 CO* species with naphthalene. The results of chemisorption experiments showed that the medium-strength Brønsted acid site, which promoted the desorption of 2-MN, inhibited the deep alkylation reaction. The 2,6-dTBPy-IR results showed that the presence of fewer Brønsted centers on the outer surface of Ga-S-1 further optimized the product distribution and enhanced the selectivity of 2-MN in MNs to more than 90 %. Under optimal conditions, 80.1 % selectivity for MNs was obtained via ZnZrO x &Ga-S-1 bifunctional catalysts, with 97.4 % selectivity for 2-MN in MNs.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2014
·Vol. 161
·期 10
·B201
·
IF 2.859
Yang Fan,Zijuan Yang,Xinhua Cao,Peifang Liu,Sen Chen,Zhen Cao
Hierarchical macro-mesoporous Ni(OH)2 were prepared by hydrothermal treatment of Ni(NO3)2 with dicyandiamide. This Ni(OH)2 nanostructure can be transformed to mesoporous NiO via calcination at 300°C. The structure, morphology and textural properties of the as-synthesized Ni(OH)2 and NiO were characterized. The electrochemical property and electrochemical sensing performance toward glucose detection were investigated. Owing to the unique macro-mesoporous structure, the Ni(OH)2 nanostructure could provide amperometric sensing of glucose with wide linear range (0.01–8.3 mM), high sensitivity of 243 μA mM cm−2 and low detection limit of 1 μM. Moreover, this glucose sensor also exhibited excellent stability, good selectivity and reproducibility.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Binglin Guo,Yihao Gao,Yongyue Li,Xin Sun,Shuailin Chen,Meicheng Li
Ni(OH)2 has low production cost and high theoretical specific capacity, while on account of the poor electronic conductivity, it shows inferior electrochemical performance including cycling stability and rate capability. This work focuses on a composite material that is in situ grown Ni(OH)2 nanosheets on reduced graphene oxide (rGO), and employing the fewer-defect rGO to build a three-dimensional conductive network provides outstanding conductivity. The specific capacitances (Cm) of the Ni(OH)2/rGO (NHG) electrode are 2776 F·g–1 at 2 A·g–1 and even 1570 F·g–1 at 50 A·g–1, demonstrating remarkable rate capability. It indicates that the combination of the nano grown Ni(OH)2 and rGO conductive substrate shortens the ion diffusion path and increases the electron transfer rate; hence, the composite rate capability has been significantly improved. The composite materials and active carbon were combined to be an asymmetric supercapacitor, which had a high energy density of 39.24 Wh·kg–1 at 1962 W·kg–1. After 10,000 cycles at 5 A·g–1, the capacity retains 91.4%.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
STAR Protocols
·
2022
·
IF 0
Qianqian Fang,Zhengkang Hua,Zhonghui Lin
Summary The human MUS81-EME1&2 complexes are structure-selective endonucleases that play important roles in DNA damage repair. Here, we describe a protocol to determine the endonuclease activities of MUS81-EME1&2 complexes toward various DNA structures. We co-express MUS81 with EME1 or EME2 and purify the complexes with high purity, and determine their activities on the cleavages of 3ˊ flaps, 5ˊ flaps, nicked double-stranded DNAs, and Holliday junctions. This protocol can also be used for the determination of substrate preferences of other structure-selective endonucleases. For complete details on the use and execution of this protocol, please refer to Hua et al. (2022) .
研究领域:
分子生物学
·
细胞生物学
·
遗传学
✓ 已验证
DOI
PubMed
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2018
·Vol. 95
·期 1
·79-88
·
IF 1.601
Ting Zheng,Zhenyu Wu,Qinglong Xie,Meizhen Lu,Fan Xia,Guangquan Wang,Yong Nie,Jianbing Ji
Owing to the decrease of global oil price, development of downstream value-added products is important to biodiesel industry. In this study, we used palmitic acid methyl ester (PAME) as a starting material to produce 2-ethylhexyl palmitate (2-EHP), an environmentally friendly biolubricant product, which was derived from the transesterification of fatty acid methyl esters and long chain fatty alcohols. Conventional synthetic routes of 2-EHP have disadvantages, including high catalyst price, low conversion efficiency, and pollution issues. To solve these problems, in situ transesterification of PAME with 2-ethylhexanol (2-EH) was conducted over unsupported potassium carbonate as heterogeneous catalyst. The optimal reaction temperature, 2-EH to PAME molar ratio, and catalyst to PAME mass ratio were 180 °C, 3:1, and 3.0 wt%, respectively. The PAME conversion reached up to 100% within 1 hour under the optimal conditions. In addition, a kinetic model describing the experimental data over a temperature range of 160–180 °C was developed. The dependence of kinetic rate constant ( k ) on temperature was evaluated, and the activation energy ( E a ) for the transesterification of PAME with 2-EH was calculated to be 57.04 kJ mol −1 .
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Mengtian Lu,Tianye Zhang,Yue Yang,Xin Lin,Jin Huang,Yuan Sun,Tiedong Sun
Graphical The study innovatively combines etched/stripped monolayer Ti 3 C 2 MXene with Cu (2- x ) Se nanoparticles in a one-pot method. The synthesized Ti 3 C 2 /Cu (2- x ) Se nanocomposite has catalase (CAT) and peroxidase (POD) -like activities combined with the excellent photothermal properties of MXene, which enhances the catalytic performance of Cu (2- x ) Se under near infrared (NIR) irradiation, and realizes the synergic photothermal catalytic treatment. Traditional tumor treatments (surgery, radiotherapy, chemotherapy, etc.) have certain limitations and can have serious negative effects, such as difficulty in cutting out tumors, damage to normal tissues, and complications. Ordinary nanozymes have low catalytic activity and require higher doses for treatment, which can increase in vivo toxicity and side effects. To address these limitations, we developed a Ti 3 C 2 MXene-based nanocomposite (Ti 3 C 2 /Cu (2- x ) Se) integrating Cu (2- x ) Se nanozymes with dual enzyme-mimicking activities (catalase and peroxidase) and MXene's photothermal properties. The Cu (2- x ) Se component catalyzes the decomposition of tumor-overexpressed H 2 O 2 into O 2 and cytotoxic ·OH, alleviating hypoxia while inducing oxidative stress. Simultaneously, MXene's high surface area and photothermal capability enhance nanozyme stability, biocompatibility, and catalytic efficiency under near-infrared irradiation. Notably, the photothermal effect amplifies enzymatic activity, enabling synergistic nanocatalytic-photothermal therapy. This synergy not only degrades glutathione to suppress tumor antioxidant defenses but also achieves targeted tumor ablation with reduced dosage requirements. Our work highlights a rational design of MXene-based nanozymes for enhanced multimodal tumor therapy, offering a paradigm for nanocomposite-driven disease treatment.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）