RSC Advances
·
2015
·Vol. 5
·期 50
·39878-39883
·
IF 3.84
Cheng Feng,Yunhui Hao,Li Zhang,Ningzhao Shang,Shutao Gao,Zhi Wang,Chun Wang
Formic acid (FA) has tremendous potential as a safe and convenient source of hydrogen for renewable energy storage, but controlled and efficient dehydrogenation of FA by a robust solid catalyst constitutes a major challenge. In this report, a metal nanoparticle functionalized zeolitic imidazolate framework (ZIF) derived N-decorated nanoporous carbon (NPC) support was fabricated and used as an efficient FA decomposition catalyst for the first time. The resultant AgPd@NPC catalyst exhibited 100% H2 selectivity and high catalytic activity (TOF = 936 h−1) toward the dehydrogenation of formic acid at 353 K. The synergetic interaction between the metal nanoparticles and NPC greatly enhances the catalytic performance of the as-prepared catalyst.
研究领域:
催化化学
·
能源材料
·
纳米材料
·
物理化学
·
氢能存储
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yaxin Feng,Guilin Wei,Yi Liu,Wenhong Han,Yan Chen,Runjie Sun,Lin Peng,Meihua Ma,Yu Zhang,Zhentao Zhang,Xirui Lu
The immobilization of iodine waste is a challenge in the field of nuclear waste . In this work, iodine waste (silver-coated silica gel with different iodine loadings) was immobilized at low-sintering temperatures (500, 550, and 600 °C). XRD represented that the crystallized phases of the sintered matrix consist of AgI and B 2 O 3 . The crystallization behavior of boron can be found as the sintering temperature increased from 500 °C to 600 °C. FT-IR results proved that in the process of crystallization, part of the microstructure related to B–O stretching transformed from [BO 4 ] to [BO 3 ] units, which benefits low-temperature iodine waste immobilization due to the bonding energy of [BO 3 ] is higher than that of [BO 4 ]. Our work reveals the B-related microstructure transition in low-temperature immobilization iodine waste.
研究领域:
核废物处理
·
材料科学
·
无机化学
·
放射化学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Food Measurement and Characterization
·
2021
·Vol. 16
·期 1
·431-439
·
IF 2.431
Wang Junzhu,Wang Shutao,Liu Shiyu,Cheng Qi
Honeysuckle is widely known for its effective chemical components and extensive pharmacological effects as a traditional medicinal material in China. Echo State Network (ESN) combined with excitation-emission fluorescence spectroscopy was proposed to detect multiple pesticides in honeysuckle and perform quantitative analysis accurately. Three different models including ESN, RNN, and BPNN were validated by comparing root mean square error, mean absolute error, and mean absolute percentage error. Results revealed that ESN outperformed other two models. For quantitative analysis, the results of three models in terms of recovery rate and average recovery rate were relatively better by ESN training, which were closer to 100% for each pesticide. Therefore, ESN model was considered as the optimal training method for detecting pesticides in honeysuckle and performing better quantitative analysis on account of its effective and accuracy predicting performance, which could provide scientific basis and theoretical reference in future research.
研究领域:
药物分析
·
食品安全
·
光谱学
·
计算生物学
·
环境毒理学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yuxi Gao,Anqi Duan,Shuang Liu,Xiaodong Wu,Wei Liu,Min Li,Shougang Chen,Xin Wang,Duan Weng
Three nanocubic Ag/Ce x Nd 1- x O 2 catalysts were synthesized to evaluate the influence of Nd doping on catalyst practicability. It was observed that Nd doping generated excessive ceria surface oxygen vacancies, but reduced the bulk oxygen vacancies . These variations in oxygen vacancies suppress the utilization of ceria bulk oxygen, and induce the formation of less active O 2− species instead of O 2 − , resulting in a low soot oxidation activity. However, the introduction of Nd can inhibit Ag sintering and thus enhance the catalysts’ thermal stability effectively. As a consequence, Ag/Ce 0.95 Nd 0.05 O 2 nanocubes make a good balance between the catalyst activity and stability. Moreover, it was observed that catalyst deactivation during soot oxidation becomes more obvious when the catalysts and soot are not in close contact.
研究领域:
催化化学
·
环境科学
·
材料科学
·
能源技术
·
大气污染防治
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Kaizhen Wang,Danrong Cai,Die Zou,Ruxue Duan,Wentao Yan,Yong Zhou,Congjie Gao
Developing ultrafiltration (UF) membranes with excellent anti-biological fouling and overcoming the hydrophobicity of membrane material itself has been a major challenge. While exposing a major drawback of being unstable and easily lost from the membrane, silver nanoparticles (AgNPs) are still used as bactericidal substances in membranes. Polyamic acid (PAA) is a flexible hydrophilic polymer that exhibits strong complexing ability and considerable steric hindrance effect on metal cations. Herein, using PAA as a stabilizer to modify the size and dispersion of silver nanoparticles (AgNPs), we developed a polyethersulfone (PES) UF membrane featuring both hydrophilic and antibacterial dual functions. The AgNPs in the as-prepared membrane were small in size (around 3–10 nm) and highly dispersed in the membrane, exhibiting highly efficient antibacterial ability with 96.82% and 98.29% inhibition towards Escherichia coli and Staphylococcus aureus , respectively. Meanwhile, the partially covered AgNPs by PAA and the high surface energy made them less susceptible to lose in the membrane. The developed membrane retained about 4.5 times more AgNPs than the original membrane for the same membrane area. Moreover, the favorable hydrophilic and pore structure endowed the membrane with high water flux and acceptable rejection of bovine serum albumin (BSA). The PES/PAA-Ag membrane exhibited an excellent water flux, which was 421.47 (L/m 2 ·h) under 1 bar pressure, about 1.4 times of PES and 3.4 times of PES-Ag membrane (with a high BSA rejection, around 90%). This work provided a reference for the development of hydrophilic and antimicrobial membranes, as well as having considerable potential practical value.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
环境科学
·
膜技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhenting Zhao,Yueyun Huang,Qiuguo Li,Haijuan Mei,Fanglong Zhu,Weiping Gong
We demonstrate the fabrication of Co 3 O 4 (derived from zeolitic imidazolate framework-67) wrapped Ag nanowires core-shell nanostructures, and support it on graphene matrix (Co 3 O 4 @Ag NWs-GR) to prepare enzymeless glucose sensor. The core-shell Co 3 O 4 @Ag nanowires possess porous surface and the proposed Co 3 O 4 @Ag NWs-GR nanocomposites exhibit hierarchical structure which could help to improve the performance of enzyme-free glucose detection. For practical application, the as-prepared Co 3 O 4 @Ag NWs-GR nanocomposites were sandwiched by nickel foam (NF) to develop a glucose detection electrode, which demonstrates good reproducibility and glucose specific selectivity. Then, the Co 3 O 4 @Ag NWs-GR/NF electrode was integrated with Pt wire, Ag/AgCl wire and polydimethylsiloxane (PDMS) to fabricate a sensitive device. The amperometric response of the as-developed device suggests that the Co 3 O 4 @Ag NWs-GR/NF based sensor presents a high sensitivity of 2.49 μA/μM/cm 2 in the linear interval of 3–2000 μM, a detection limit of 0.98 μM, as well as an outstanding long-term stability. Additionally, the human serum was used to verify that the Co 3 O 4 @Ag NWs-GR based glucose sensor can detect the glucose level in serum, suggesting it is applicable to the enzymeless glucose determination.
研究领域:
生物医学工程
·
纳米医学
·
电化学传感
·
糖尿病监测
·
转化医学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2018
·
IF 3.641
Junhua Zhang,Zhaoli Yan,Liangjie Fu,Yi Zhang,Huaming Yang,Jing Ouyang,Deliang Chen
Acid-activated sepiolite nanofibers (ASep) were organically modified with (3-aminopropyl) triethoxysilane (APTES) to produce the amino-functionalized nanofibers (NH 2 -ASep). Due to the amino groups, highly dispersed silver nanoparticles (AgNPs) were assembled on the surface of NH 2 -ASep by a simple chemical reduction approach, and the AgNPs were smaller than those directly deposited onto ASep surface. The as-synthesized Ag/NH 2 -ASep nanofiber catalysts exhibited an excellent catalytic activity in the reduction process of 4-nitrophenol to 4-aminophenol with full conversion within 150 s in the presence of NaBH 4 as the reductant . The results indicated that Ag/NH 2 -ASep nanofiber catalysts exhibited excellent catalytic activities because the highly dispersed of small-sized AgNPs were exposed on the surface of highly dispersed nanofibers with amino functional groups, allowing effective contact with the reactants and catalysis of the reaction. Moreover, the Ag/NH 2 -ASep nanofiber catalysts are stable and easy to use for the catalytic reaction due to their one-dimensional nanofiber structure with functional amino groups.
研究领域:
材料科学
·
纳米技术
·
环境催化
·
无机化学
·
应用化学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3729-3743
·
IF 5.7
Zhang Cuizhi,Gao Kairu,Chu Xiaomeng,Liu Shaojie,Li Peixin,Tang Erjun
Polyamidoamine (PAMAM) encapsulated nano-Ag is a highly efficient catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in water. However, PAMAM is easily soluble in water, making the nano-Ag catalyst difficult to recycle. In this work, carboxymethyl cellulose (CMC) was oxidized by sodium periodate to obtain oxidized carboxymethyl cellulose (CMC-CHO) containing aldehyde groups. PAMAM encapsulated nano-Ag (G4.0-PAMAM-Ag) was prepared with G4.0-PAMAM as template. Through the Schiff base reaction between CMC-CHO and G4.0-PAMAM-Ag, the CMC/PAMAM hydrogel loaded with nano-Ag (CMC-PAMAM-Ag) was prepared. The catalytic performance of CMC-PAMAM-Ag in the reduction of 4-NP to 4-AP in water was studied. It was found that its time required for accomplishing the reduction reaction was only 9 min, similar to that of free G4.0-PAMAM-Ag (8 min). Turnover frequency was as high as 169 h −1 , much higher than that of the cellulose/PAMAM composite supported nano-Ag (4.2 h −1 ) and dextrann/PAMAM hydrogel supported nano-Ag (40.2 h −1 ). The recovered hydrogel was characterized by X-ray photoelectron spectroscopy and it was found that the imine bonds in the fresh hydrogel were reduced to the amine bonds in the recovered hydrogel, improving the stability of hydrogel. The recovered hydrogel still had a good catalytic performance.
研究领域:
高分子化学
·
环境催化
·
纳米材料
·
水处理
·
绿色化学
✓ 已验证
DOI
高影响因子
ANALYST
·
2017
·Vol. 142
·期 14
·2587-2594
·
IF 3.885
Lina Zhang,Yanhu Wang,Lei Shen,Jinghua Yu,Shenguang Ge,Mei Yan
In this study, hyperbranched polyethyleneimine-protected silver nanoclusters (hPEI-AgNCs) with excellent electrochemiluminescence (ECL) emission in the presence of coreactant K2S2O8 were prepared by chemical reduction of silver ions (silver nitrate) coordinated with dendrigraft polymer, and successfully used for the construction of an ECL immunosensor. Polyaniline (PANI)/polypyrrole (PPy)-silver (Ag) dendrites with good electrical conductivity and biocompatibility were electropolymerized on the surface of indium tin oxide (ITO) electrode as carriers. Porous ZnO sphere-loaded hPEI-AgNCs-induced signal amplification strategies were integrated exquisitely and applied sufficiently. Taking carcinoembryonic antigen (CEA) as an example, under optimal conditions, the CEA concentration was determined to be in the range of 10−3 ng mL−1–100 ng mL−1 and with a detection limit of 0.4 pg mL−1 using this method; it exhibited excellent selectivity, high stability, and acceptable fabrication reproducibility. It was anticipated that hPEI-AgNCs would have promising applications in green, selective, and sensitive detection of target analytes in the future.
研究领域:
分析化学
·
生物传感
·
纳米医学
·
肿瘤学
·
免疫学
·
转化医学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 37
·4518-4524
·
IF 2.073
Qijun Dai,Te Wei,Changli Lv,Fang Chai
In this study, we have reported a facile, cost-effective method for the synthesis of silver nanoparticles (Ag NPs) using uric acid (UA) as the reducing agent. Techniques such as UV-visible spectroscopy, transmission electron microscopy and X-ray spectroscopy were performed to characterize the generated UA–Ag NPs. UA–Ag NPs exhibited excellent specificity towards Ba2+ and Sr2+, which could be traced by UV-visible spectra and the naked eye; we also obtained the lowest detection limits of 52.1 nM and 27.5 nM for Ba2+ and Sr2+, respectively. The proposed method provided sensitive and rapid detection of Ba2+ and Sr2+ at the nM level in water samples, and the values were much lower than the U. S. EPA standard for the maximal limits of these metal ions in drinking water. UA–Ag NPs could be employed as a colorimetric probe to assay Ba2+ and Sr2+ in lake water, indicating their potential applicability for detection in real samples. As far as we know, this is the first attempt for the colorimetric detection of Sr2+ by noble metal nanoparticles. Furthermore, UA–Ag NPs exhibited excellent potential for catalyzing the reduction of nitrophenols and potassium ferricyanide.
研究领域:
纳米医学
·
分析化学
·
环境监测
·
生物传感
·
无机化学
·
催化化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 30
·16053-16062
·
IF 6.895
You Jun Fan,Peng Tao Yu,Fei Liang,Xin Li,Hua Yang Li,Lu Liu,Jin Wei Cao,Xue Jiao Zhao,Zhong Lin Wang,Guang Zhu
Stretchable electrodes have a crucial impact on the development of flexible electronic systems. Most conventionally blended nanocomposite electrodes are incapable of achieving high stretchability, breathability, or durability. In this work, a highly conductive, breathable, and stretchable epidermal electrode (SEE) is demonstrated by designing a hierarchically interactive nano-network that is composed of elastic polymer nano-fibers and multi-level silver nano-wires (AgNWs). The elastic polymer nano-fibers act as a continuous scaffold, and multi-level AgNWs embedded in the nano-fibers form branched conductive pathways. This structure enables high conductivity of the SEE at 4800 S cm−1 (at a significantly low AgNW content of 1.59 vt%), with high stretchability and excellent durability. For example, the SEE remained conductive even at a high strain of 500%, and it also maintained its initial resistance even after 30 000 cycles of strain at 50% or being washed with water for 100 000 cycles. The SEE was prepared by a facile in situ nonequilibrium fabrication process, and can easily be produced into an elastic circuit on a large scale, which provides a foundation for integrated and multifunctional electronic skins. The SEE possesses superior mechanical conformability and permeability of gas and liquid, and therefore, it was successfully applied in measuring electrocardiogram signals and thermal therapy, and exhibited highly robust and comfortable performances even while being washed with water or undergoing complex deformations.
研究领域:
生物医学工程
·
柔性电子学
·
皮肤界面器件
·
分子材料科学
·
可穿戴传感器
·
转化医学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-12
·
IF 5.578
Jiao Tifeng,Guo Haiying,Zhang Qingrui,Peng Qiuming,Tang Yongfu,Yan Xuehai,Li Bingbing
New reduced graphene oxide-based silver nanoparticle-containing composite hydrogels were successfully prepared in situ through the simultaneous reduction of GO and noble metal precursors within the GO gel matrix. The as-formed hydrogels are composed of a network structure of cross-linked nanosheets. The reported method is based on the in situ co-reduction of GO and silver acetate within the hydrogel matrix to form RGO-based composite gel. The stabilization of silver nanoparticles was also achieved simultaneously within the gel composite system. The as-formed silver nanoparticles were found to be homogeneously and uniformly dispersed on the surface of the RGO nanosheets within the composite gel. More importantly, this RGO-based silver nanoparticle-containing composite hydrogel matrix acts as a potential catalyst for removing organic dye pollutants from an aqueous environment. Interestingly, the as-prepared catalytic composite matrix structure can be conveniently separated from an aqueous environment after the reaction, suggesting the potentially large-scale applications of the reduced graphene oxide-based nanoparticle-containing composite hydrogels for organic dye removal and wastewater treatment.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
催化化学
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）