ChemElectroChem
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2020
·Vol. 7
·期 8
·1869-1876
·
IF 4.154
Jinlong Sun,Jie Xu,Hui Jiang,Xinsheng Zhang,Dongfang Niu
Graphical Multiple roles : Three carbon nanotubes (CNTs)-supported Ag catalysts with precise tuning oxygen functional groups were reasonably designed/synthesized and applied into efficient electrochemical conversion of CO 2 to CO. The surface carboxyl groups on the CNTs play essential roles in loading Ag nanoparticles and tuning surface acidic environment of catalysts, and the rich surface protons are proved to be important for promoting the formation of intermediate, which could effectively improve the CO production. Carbon nanotubes (CNTs)-supported metal-based catalysts applied in the electrochemical reduction of CO 2 (CO 2 ER) have attracted extensive research recently. Nevertheless, insight into the roles of surface oxygen functional groups in these catalysts on CO 2 ER is still deficient. Herein, three catalysts were reasonably fabricated by chemically loading Ag nanoparticles (NPs) on the oxygenic CNTs (CNT−COOH, CNT−OH and CNT−CO) with precise tuning oxygen functional groups, and then used to explore the effect of oxygen functional groups on the electrocatalytic performance of Ag NPs for CO 2 ER. Compared with the other two counterparts, Ag/CNT−COOH with the highest content of carboxyl groups possesses the most uniform size and dispersion of Ag NPs and the strongest surface acidic environment, which enable it to exhibit the highest current density and Faradaic efficiency for CO production at high overpotential region ( E ≤−1.0 V vs. RHE). This work broadens the understanding of surface oxygen functional groups of catalysts in enhancing CO 2 ER performance, and provides guidance for the design and synthesis of high-performance catalysts.
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CHEMOSPHERE
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2020
·
IF 5.778
Ping Li,Yixing Wang,Hairong Huang,Shuai Ma,Hu Yang,Zhen-liang Xu
Catalytic membrane plays an important role in environmental remedy. In this study, we reported an Ag coated membrane (PAN-Si-Cu-Ag) with a high catalytic activity to reduce 4-nitrophenol (4-NP) and methyl orange (MO) from water. The best performance is 99% reduction degree and 280 L m −2 .h −1 .bar −1 flux for (4-NP) reduction at 4-NP: NaBH 4 = 1:50 (mM) during a 12-h filtration. The reduction degree for MO is above 90% and the flux is about 230 L m −2 ·h −1 ·bar −1 , which is almost the best report till now. The Ag coated membrane was prepared by metal displacement-epitaxial growth on silica covalent grafted PAN membrane (PAN-Si). Silica atoms were used as linker to ensure the good adhesion between polymer and metal NPs, the loss amount of Ag NPs from the coated catalytic membrane is loss about 2 μg/cm 2 after one month storage. Cheap metal NPs were firstly reduced on the surface of PAN-Si membrane and then used to displace Ag ions. Thus the obtained catalytic membrane showed a very high loading (28%). Finally, the catalytic filtration mechanism of 4-NP was distinguished by Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and adsorption measurement.
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ACS Applied Bio Materials
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2020
·
IF 0
Xiaohui Jing,Lin Chang,Lixia Shi,Xiaohong Liu,Yuan Zhao,Wei Zhang
As a powerful toxin that could cause fatal death, the detection of ochratoxin A (OTA) has gained much attention in the fields of environmental and food sciences. In this study, an internal standard (IS) aptasensor was synthesized through a facile and scalable method to enhance the sensitivity and quantativity of OTA detection. The substrates were formed through hybridization of modified aptamers on Au@Ag core–shell nanoparticles (NPs) and Au films at a silicon surface. Incorporated with 4-ATP and 4-NTP as an internal standard, OTA recognition of such aptamers could cause NP release and signal losses. Utilizing the strong peaks at 1078 and 1335 cm–1, which represent 4-ATP and 4-NTP, respectively, the intensity ratio of I1078/I1335 could delegate the OTA concentration in a ratiometric manner. Therefore, the highest ratio of I1078/I1335 represents the lowest concentration of OTA, and a lower ratio means a higher OTA concentration. Quantitatively, the high consistency for OTA detection was achieved through correction of signal losses by IS references with an R2 of 0.993 and RSD of 0.94%, and the OTA detection limit of 5 pM was achieved. Herein, such an IS aptasensor provides a reliable and scalable detection platform for various molecules in a continuous and high-throughput manner and holds great promise in future quantitative SERS measurements.
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JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Zhen Sun,Yanqing Lai,Na Lv,Liangxing Jiang,Ming Jia,Jie Li,Weizhai Bao,Fangyang Liu
Solid-state batteries (SSBs) exhibit a promising prospect due to their potential in terms of safety and energy densities . As an oxide electrolyte, cubic garnet solid electrolyte (cubic-Li 7 La 3 Zr 2 O 12 ) attracts wide attention due to the high ionic conductivity . However, the problem of poor contact between garnet solid electrolyte and lithium impairs the development of solid electrolytes. Herein, we demonstrate an effective modification method to cope with the interface issue between electrolyte and Li metal by introducing an Ag@WSe 2 composite layer. By applying this method, the interfacial resistance between the garnet electrolyte and Li metal is reduced to ~12.5 Ω cm 2 , which is nearly 150 times lower than the value of 1900 Ω cm 2 before modification. The WSe 2 acts as a framework to immobilize Ag, while Ag forms an Ag–Li alloy with lithium for lithium ions transportation. And other Ag@TMDs (transition metal dichalcogenides) composites have also been proven to have similar effects. In addition, the Li | Ag@WSe 2 -LLZO | LFP full cell demonstrates a satisfactory capacity and excellent cycle stability (500 cycles with 90% capacity retention rate) at room temperature .
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Zhencheng Yu,Chuanshuang Hu,Litao Guan,Weiwei Zhang,Jin Gu
In this study, we reported an environmentally benign method for the synthesis of silver nanoparticles (AgNPs) by using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (CNFs) as the only reducing agent and stabilizer under mild aqueous conditions. The AgNPs were tightly adhered to the CNF surface, and the resulting stable CNF–AgNP suspension can be used for rapid and selective detection of l-cysteine (Cys). The efficacy of the process relies upon the surface plasmon resonance properties of AgNPs and the aggregation effect of AgNPs in the presence of Cys. Under optimal ionic strength provided by NaCl, Cys interacted with AgNPs, leading to a change in yellow color of the CNF–AgNP to purple. The colloidal suspension showed high sensitivity (limit of detection of 49 nM) and rapid (5 min) and selective detection of Cys among 20 amino acids that make up human proteins, hence demonstrating great potential for analyzing practical samples.
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TALANTA
·
2020
·
IF 5.339
Xiaowei Mu,Minxing Wu,Bo Zhang,Xin Liu,Shaomei Xu,Yibing Huang,Xinghua Wang,Daqian Song,Pinyi Ma,Ying Sun
In this study, we describe the construction of an “off-on” fluorescent probe based on carbon dots (CDs) and silver nanoparticles (AgNPs) mixture for sensitive and selective detection of cysteamine . By mixing AgNPs with CDs solution, the fluorescence of CDs was significantly decreased due to the inner filter effect (IFE). Upon addition of cysteamine to the mixed aqueous of CDs and AgNPs, the silver-sulfur bond between cysteamine and AgNPs caused AgNPs to aggregate, and the quenched fluorescence of CDs could in turn be recovered. The probe was employed to quantitatively detect cysteamine, and the results showed that it could detect cysteamine in a concentration range of 2–16 μM with the detection limit of 0.35 μM (signal-to-noise ratio of 3). The detection of cysteamine spiked into bovine serum samples showed high recovery rates ranging from 95.5 to 111.7%. More importantly, the developed probe had low cytotoxicity and was successfully used for in vivo imaging of HepG2 cells.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Liyan Bi,Xiao Wang,Xiaowei Cao,Luying Liu,Congcong Bai,Qingyin Zheng,Jaebum Choo,Lingxin Chen
There is a challenge to obtain an ultrasensitive and rapid approach to detect bacteria and identify resistance. As a powerful bioanalytical tool, surface-enhanced Raman scattering (SERS) in bacterial detection have attracted increasing attentions. Herein, we developed a SERS-active [email protected] core-shell nanorod ( [email protected] ) tag platform for ultrasensitive bacteria detection and antibiotic-susceptibility testing (AST). The platform established that surface enhanced Raman scattered Rhodamine 6G (R6G) absorption at 1517 cm −1 had a good linearity (RI = 3865 + 193logC; R 2 = 0.97) with logarithm of E. coli concentration over a range of 10 7 –10 2 CFU (colony forming unit)/mL with limit of detection as low 10 2 CFU/mL. When E. coli was exposed to ampicillin at minimum inhibitory concentration (MIC, 4 μg/mL), Raman spectroscopy showed the obvious variation between ampicillin-susceptible E. coli (Amp − - E. coli ) and the ampicillin-resistant E. coli (Amp + - E. coli ). Combined with principal component analysis (PCA) statistical analysis, the Raman intensity variation mentioned above allows to obtain rapid antibiotic resistance testing (<3.5 h). In addition, E.coli spiked into blood from C57BL/6 mice can be identified clearly, indicating the potential for point-of-care diagnostics.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Yixin Liu,Binxiao Li,Yuanyuan Yao,Beibei Yang,Tongtong Tian,Yan Miao,Baohong Liu
An electrochemiluminescence (ECL) resonance energy transfer system is constructed for 17β-estradiol (E2) detection using α [email protected] nanospheres as the ECL-active substrates and Ag NCs as an efficient quencher. CdS QDs loaded onto three-dimensional (3D) urchin-like α-FeOOH nanospheres (α [email protected] nanospheres) exhibited excellent ECL responses, which is attributed to dual-amplification of α-FeOOH frameworks. The 3D hierarchical structure of the α-FeOOH nanospheres provided abundant sites for loading ECL-active species, thus significantly improving the ECL performance of substrates; While Fe 3+ presented on surface of α-FeOOH nanospheres could be reduced to Fe 2+ in negative potentials, after which might activate persulfate in a Fenton-like process, resulting in more sulfate free radicals for more effective ECL responses via electron transfer reactions. Additionally, Ag nanoclusters (Ag NCs) stabilized by single stranded oligonucleotide were introduced as quenching probes for CdS QDs owing to the well-matched donor-acceptor spectrum for efficient energy transfer, which makes them appropriate for detection of E2. The proposed strategy displayed a desirable dynamic range from 0.01 to 10 pg mL −1 with a limit of detection of 0.003 pg mL −1 . The proposed strategy based on the ECL-RET strategy offered an ideal way for E2 detection, and also revealed an alternative platform for detection of other small molecules.
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Sustainable Chemistry and Pharmacy
·
2020
·
IF 3.294
Liang Zhang,Yichen Zhao,Chaoqun Mu,Xiaomin Zhang
A magnetic adsorbent was prepared by polydopamine coating and thiourea grafting on carbon-modified discarded fly ash magnetic beads (TPCMFA). The successfully preparation of the TPCMFA was supported by SEM image, XRD, FT-IR and Raman spectroscopy . Batch adsorption experiments reveal that the adsorption of silver ions on this magnetic sorbent TPCMFA agreed with the Langmuir isotherm model, with a maximum absorbability of 94.94 mg g -1 . Kinetics data revealed that the adsorption of silver ions on TPCMFA conform to a pseudo-second-order. The TPCMFA achieved remarkable selectivity for Ag (I) that was almost five times higher than that for ions of copper, zinc and nickel. After three cycles, the adsorption capacity of TPCMFA remained at 93.5% of the adsorption capacity of the initial material. These results show that this new magnetic adsorbent prepared from discarded fly ash magnetic beads has promising commercial prospects.
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Analytical Methods
·
2020
·Vol. 12
·期 33
·4123-4129
·
IF 2.596
Wei Liu,Zihao Song,Yifan Zhao,Yu Liu,Xuan He,Sheng Cui
Sensitive and reliable methods for explosives detection are of significance in homeland security due to the serious threats of explosives in terrorist attack events. However, such suitable sensors are still rare. Herein, porous silica aerogels decorated with silver nanoparticles (SiO2–Ag hybrids) were prepared and applied as a flexible SERS substrate for ultrasensitive explosives detection. It is worth noting that the silica aerogel we prepared had good flexibility compared with traditional silica aerogels, which effectively avoided structural damage during sample collection. Also, because of excellent adsorption performance provided by the silica aerogel, trace explosive 3-nitro-1,2,4-triazol-5-one (NTO) could be enriched and realized by label-free detection. Combined with the plasma enhancement provided by Ag NPs decorated around these porous aerogels, the limit of detection for explosive NTO was as low as 7.94 × 10−10 M. As far as we know, this SiO2–Ag hybrid SERS substrate was firstly used for the detection of explosives. It presented good sensitivity and reproducibility for analyte sensing. Most importantly, this is a label-free method for trace explosives detection and has a good application prospect in homeland security.
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Nanomaterials
·
2020
·Vol. 10
·期 5
·883
·
IF 4.324
Bonan Zhao,Zhipeng Dong,Qiyan Wang,Yisong Xu,Nanxia Zhang,Weixing Liu,Fangning Lou,Yue Wang
The size-uniformed mesoporous Ag@SiO2nanospheres’ catalysts were prepared in one-pot step via reducing AgNO3by different types of aldehyde, which could control the size of Ag@SiO2NPs and exhibit excellent catalytic activity for the hydrogenation of nitrobenzene. The results showed that the Ag core size, monitored by different aldehydes with different reducing abilities, together with the ideal monodisperse core-shell mesoporous structure, was quite important to affect its superior catalytic performances. Moreover, the stability of Ag fixed in the core during reaction for 6 h under 2.0 MPa, 140 °C made this type of Ag@SiO2catalyst separable and environmentally friendly compared with those conventional homogeneous catalysts and metal NPs catalysts. The best catalyst with smaller Ag cores was prepared by strong reducing agents such as CH2O. The conversion of nitrobenzene can reach 99.9%, the selectivity was 100% and the catalyst maintained its activity after several cycles, and thus, it is a useful novel candidate for the production of aniline.Keywords:mesoporous;Ag@SiO2;catalyst;hydrogenation;nitrobenzene
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Tailong Cai,Xiaoyuan Shen,Erzhuo Huang,Yutao Yan,Xiaoping Shen,Fengqiang Wang,Zhe Wang,Qingfeng Sun
Wood is an important and ubiquitous material applied in building and decorative applications, but it is easily invaded by fire, water and microorganisms. In this study, a new Ag nanoparticles supported on MgAl-LDH decorated wood veneer is successfully developed via simple hydrothermal reaction and silver mirror reaction. This unique wood veneer shows excellent flame retardancy under a continuous open flame, and super water repellency with a large water contact angle of 156°. In addition, the wood veneer has admirable antimicrobial activity (e.g. Staphylococcus aureus and Escherichia coli ). This paper presents a novel route of synthesizing a well-designed wood based composite with enhanced flame retardancy, water repellency and antimicrobial activity, which greatly broadens the application range of wood.
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