ACS Sensors
·
2020
·
IF 7.333
Hui Jiang,Jun Yang,Kai Wan,Donglei Jiang,Changhai Jin
Sensitive detection of lipopolysaccharides (LPSs), which are present on the outer wall of Gram-negative bacteria, is important to reflect the degree of bacterial contamination in food. For indirect assessment of the LPS content, a miniaturized electrochemical cell sensor consisting of a screen-printed paper electrode, a three-dimensional cells-in-gels-in-paper culture system, and a conductive jacket device was developed for in situ detection of nitric oxide released from LPS-treated mouse macrophage cells (Raw264.7). Nafion/polypyrrole/graphene oxide with excellent selectivity, high conductivity, and good biocompatibility functionalized on the working electrode via electrochemical polymerization could enhance sensing. Raw264.7 cells encapsulated in the alginate hydrogel were immobilized on a Nafion/polypyrrole/graphene oxide/screen-printed carbon electrode in paper fibers as a biorecognition element. Differential impulse voltammetry was employed to record the current signal as-influenced by LPS. Results indicated that LPS from Salmonella enterica serotype Enteritidis caused a significant increase in peak current, varying from 1 × 10–2 to 1 × 104 ng/mL, dose-dependently. This assay had a detection limit of 3.5 × 10–3 ng/mL with a linear detection range of 1 × 10–2 to 3 ng/mL. These results were confirmed by analysis of nitric oxide released from Raw264.7 via the Griess method. The miniaturized sensor was ultimately applied to detect LPSs in fruit juice samples. The results indicated that the method exhibited high recovery and relative standard deviation lower than 2.65% and LPSs in samples contaminated with 102–105 CFU/mL bacteria could be detected, which proved the practical value of the sensor. Thus, a novel, low-cost, and highly sensitive approach for LPS detection was developed, providing a method to assess Gram-negative bacteria contamination in food.
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Nanomaterials
·
2020
·Vol. 10
·期 4
·686
·
IF 4.324
Linlin Du,Peng Gao,Yuanli Liu,Tsuyoshi Minami,Chuanbai Yu
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.Keywords:polypyrrole/hollow mesoporous silica particle;chromium(Cr);adsorption
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ting Xiao,Pengcheng Che,Shulin Wang,Wenjie Zhou,Fei Chen,Fujun Tao,Xuelin Chen,Xinyu Tan,Peng Xiang,Lihua Jiang,Xiaobo Chen
Carbon cloth (CC), a promising current collector with low weight and excellent robust mechanical property, has attracted increasing attention as the anode for supercapacitors recently. In this study, we show a novel two-prong strategy to remarkably enhance its capacitance via electrochemical activation and polypyrrole (PPy) deposition. The facile activation process created more active sites and induced oxygen-containing groups while the PPy layer provided extra capacitance contribution. Such strategy significantly boosted the capacitive property: The obtained PPy/ACC exhibited a high specific capacitance of ∼3.184 F cm −2 which is about 2.75 times the original CC within the potential window of −1.0–0 V in 1 M KOH electrolyte. A symmetric supercapacitor with the PPy/ACC as both the cathode and anode showed a high stable working voltage up to 1.8 V and a maximum energy density of 3.62 mWh cm −3 at 1.4 V. Moreover, an asymmetric supercapacitor employing it and Ni–Bi–S/Ni delivered an even higher energy density of 5.81 mWh cm −3 .
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ACS Omega
·
2020
·
IF 2.87
Jing Li,Guoyun Zhou,Yan Hong,Chong Wang,Wei He,Shouxu Wang,Yuanming Chen,Zesheng Wen,Quanyong Wang
A copolymer comprising of pyrrole and 1,4-butanediol diglycidyl ether (PBDGE) was designed and synthesized as a leveler to improve the throwing power for printed circuit board (PCB) through-hole electroplating. The results of linear sweep voltammetry (LSV), galvanostatic measurements (GMs), and cyclic voltammetry (CV) reveal the strong coordination effect of PBDGE with other additives and confirm the advantageous performance of PBDGE to effectively assist the electroplating of through-hole. An increment of 35.5% in the throwing power was achieved under the addition of PBDGE in through-hole plating. Additionally, the reaction mechanism was studied by quantum chemical calculations and molecular dynamics (MD) simulations, indicating that the pyrrole rings of the PBDGE molecule are adsorbed on the copper surface as the adsorption sites to balance the copper plating regardless of the through-hole position differences.
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Materials
·
2020
·Vol. 13
·期 7
·1513
·
IF 3.057
Jialing Kang,Mengjia Wang,Chenbao Lu,Changchun Ke,Pan Liu,Jinhui Zhu,Feng Qiu,Xiaodong Zhuang
Due to the growing demand for energy and imminent environmental issues, hydrogen energy has attracted widespread attention as an alternative to traditional fossil energy. Platinum (Pt) catalytic hydrogen evolution reaction (HER) is a promising technology to produce hydrogen because the consumed electricity can be generated from renewable energy. To overcome the high cost of Pt, one effective strategy is decreasing the Pt nanoparticle (NP) size from submicron to nano-scale or even down to single atom level for efficient interacting water molecules. Herein, atomically dispersed Pt and ultra-fine Pt NPs embedded porous carbons were prepared through the pyrolysis of Pt porphyrin-based conjugated microporous polymer. As-prepared electrocatalyst exhibit high HER activity with overpotential of down to 31 mV at 10 mA cm−2, and mass activity of up to 1.3 A mgPt−1at overpotential of 100 mV, which is double of commercial Pt/C (0.66 A mgPt−1). Such promising performance can be ascribed to the synergistic effect of the atomically dispersed Pt and ultra-fine Pt NPs. This work provides a new strategy to prepare porous carbons with both atomically dispersed metal active sites and corresponding metal NPs for various electrocatalysis, such as oxygen reduction reaction, carbon dioxide reduction, etc.Keywords:platinum;atomically dispersed active site;nanoparticle;porous carbon;hydrogen evolution reaction
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xingliang Chen,Tao Shi,Guanglei Wu,Yun Lu
The MoS 2 @polypyrrole@Fe 3 O 4 composite was skillfully synthesized via a novel one pot method. No any separation step during the synthesis process, and the Fe 2+ was successively utilized to prepare the Ppy and Fe 3 O 4 , which can achieve a high utilization of raw materials. The characterization about microstructure, crystal form, elemental composition and surface functional groups verify the structure of MoS 2 @polypyrrole@Fe 3 O 4 . Its hysteresis loop indicates that the composite performs typical soft magnetism behavior, with a magnetic saturation value of 20.3 emu.g −1 , which is helpful to improve the magnetic loss for EM wave absorbing. The reflection loss curve suggested that the composite exhibits superior EM wave absorption performance, with a minimum reflection loss value of –32 dB at the specimen thickness of just 2.0 mm due to the fair electromagnetic matching, interface polarization and interface relaxation. In addition, the one pot method used in this work can promisingly be applied to prepare other similar composites such as carbon fiber@polypyrrole@Fe 3 O 4 , graphene@polypyrrole@Fe 3 O 4 .
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ACS Applied Nano Materials
·
2020
·
IF 0
Enqing Liu,Jiangping Zhu,Weijun Yang,Fan Liu,Can Huang,Shuangfeng Yin
In this work, a functionalized metal–organic layer (MTTB MOL) was first synthesized and characterized, where MTTB means that it was synthesized from TTB (4,4′,4″-s-triazine-2,4,6-triyl-tribenzoate). On this basis, a hybrid metal–organic framework of PCN-222(Co)@MTTB was further synthesized by combining two-dimensional (2D) MTTB MOLs and three-dimensional (3D) PCN-222(Co) MOFs (metal–organic frameworks) via a one-step method. When applied to the cycloaddition reaction of carbon dioxide (CO2) and epoxides, PCN-222(Co)@MTTB was found to exhibit excellent synergistic catalytic performance under mild conditions. The unique catalytic activity of the composite is due to the combination of the exposed acidic sites (Co2+, Zr4+) and basic sites (−N– groups) within the matrix of the MOF structure, thereby providing a new method for the exploration of effective catalysts for the conversion of CO2 to value-added chemicals under mild conditions.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Siyu Zhong,Huaizhi Liu,Donghai Wei,Jin Hu,Hang Zhang,Hongshuai Hou,Meixia Peng,Guanhua Zhang,Huigao Duan
An effective design of carbon materials with appropriate nanoarchitecture and optimized physicochemical property is critically demanded for superb lithium/sodium storage capacities. N-rich (up to 15.7%) hollow carbon nanotubes (NCNT) with long aspect ratio are well developed via a template method by exploring polypyrrole as the high nitrogen-containing carbon precursor. Owing to the hollow structure with large cavity and long aspect ratio, the NCNT exhibits Li + /Na + storage capability with favorable volume buffer and rapid ion and electron transfer at high rate, resulting in long-term cycling and high-rate property. Meanwhile, the high N content creates abundant active sites and extrinsic defects, facilitating the improved specific capacity and rate performance. Impressively, our NCNT-600 electrode displays a favorable reversible capacity of 132 mAh g −1 after 5000 cycles at 4000 mA g −1 for SIBs and 170 mAh g −1 after 2000 cycles at the same current for LIBs. Further quantitative kinetic analysis reveals the dominated capacitive contribution of Li + /Na + storage in NCNT, which is attributed to the porous hollow nanotubes and N-rich carbon with volume strain mitigation and enhanced electronic/ionic transfer capability. Given the cost-effectiveness and material sustainability, our work will shed light on the further design of other carbon-based materials for advanced energy storage devices.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 17
·7042-7050
·
IF 3.288
Jingjing Yuan,Lin Wang,Bo Xu,Ping Wang,Jiugang Yuan,Yuanyuan Yu,Chao Deng,Qiang Wang
Silk fibroins (SFs) have many attractive properties; however, the practical applications of pure fibroin materials are severely restricted by their low elasticity. To improve flexibility of regenerated SF membranes, carboxyl-terminated polyethylene glycol (cPEG) was introduced into fibroin chains using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS). Subsequently, laccase-mediated graft polymerization of polypyrrole (PPy) onto the SF-g-cPEG membrane was performed to achieve electrical conductivity. The results implied that cPEG was successfully grafted onto the SF chains; the elongation at break of the SF-g-cPEG membrane increased by three times compared to that of the untreated one. Meanwhile, the introduced cPEG promoted the binding of pyrrole radical cations onto fibroin membrane, resulting in an efficient deposition of a PPy conductive layer during the laccase treatment. Conductivity of the membrane of SF-g-cPEG/PPy meets the standard of conductive materials even after 48 cycles of bending testing. In addition, the composite membrane has acceptable in vitro biocompatibility. The present work provides a novel alternative for fabrication of flexible and conductive SF biomaterials, which would expand the applications of fibroin materials in wearable electronics.
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LANGMUIR
·
2020
·
IF 3.557
Xue Jiang,Yanxing Wang,Danyang Xu,Bi Lin,Fan Yang,Ruichan Lv
In this research, typical organic/inorganic photothermal therapy (PTT) agents were designed with a combination of upconversion luminescent (UCL) or near-infrared (NIR) II imaging rare-earth nanomaterials for photo-acoustic (PA)/UCL/NIR II imaging-guided PTT under NIR laser irradiation. The results show the following: (1) The PTT effect mainly comes from NIR absorption and partly from UCL light conversion. (2) Visible UCL emission is mainly quenched by NIR absorption of the coated PTT agent and partly quenched by visible absorption, indicating that excitation may play a more important role than in the UCL emission process. (3) The biostability of the composite might be decided by the synthesis reaction temperature. Among the five inorganic/organic nanocomposites, UCNP@MnO2 is the most suitable candidate for cancer diagnosis and treatment because of its stimuli-response ability to the micro-acid environment of tumor cells and highest biostability. The composites generate heat for PTT after entering the tumor cells, and then, the visible light emission gradually regains as MnO2 is reduced to colorless Mn2+ ions, thereby illuminating the cancer cells after the therapy.
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RSC Advances
·
2020
·Vol. 10
·期 18
·10546-10551
·
IF 3.119
Juanjuan Yin,Qingqing Liu,Jingxin Zhou,Lexin Zhang,Qingrui Zhang,Randi Rao,Shufeng Liu,Tifeng Jiao
A conductive hydrogel is a composite conductive material formed by combining a conductive polymer with a nanogel structure of a hydrogel. Conductive hydrogels not only have potential applications in supercapacitors, sensors, and modulators, they can also be synthesized by many methods, such as copolymerization, crosslinking, and grafting. In this work, we successfully prepared three conductive composite hydrogels by in situ polymerization, namely polypyrrole sodium alginate conductive hydrogel, ferric chloride-doped polypyrrole sodium alginate hydrogel and doped polypyrrole sodium alginate hydrogel with sodium dodecylbenzene sulfonate. In addition, a series of characterizations were performed for the three conductive hydrogels described above. The results show that the polypyrrole sodium alginate hydrogel doped with ferric chloride forms a nanofiber network with a more stable structure and better electrochemical performance.
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Nanoscale
·
2020
·Vol. 12
·期 17
·9680-9687
·
IF 6.895
Jingjing Xing,Jintao Tong,Ye Liu,Yutong Guo,Lanjian Zhuge,Dafeng Zhang,Ruomeng Duan,Bo Song,Yu Zhao,Bin Dong
The use of solar evaporators, which are capable of purifying water through solar energy, is a potentially attractive solution to relieve the world-wide water shortage problem. However, there may be toxic and volatile substances, such as ammonia, in water bodies, which could be evaporated along with water during the evaporation process, causing contamination of the purified water. In this work, we report an efficient ammonia responsive high-efficiency solar evaporator based on the titanium dioxide nanoparticle (TiO2NP) and polypyrrole nanoparticle (PPyNP) composite. Owing to the synergistic effect between the photo-induced hydrophilicity of the TiO2NPs and the photothermal effect of the PPyNPs, the solar evaporator is able to transport and evaporate water with an efficiency as high as 97.3% and an evaporation rate of 2.9 kg m−2 h−1 (under 2 sun irradiation). Interestingly, due to the ammonia responsiveness, the solar evaporator acts smartly and stops working in the presence of ammonia, thus avoiding the evaporation of this contaminant. In addition, the current solar evaporator is capable of degrading organic pollutants (e.g. dyes), which relies on the photocatalytic activity of TiO2NPs. We thus believe that the ammonia responsive solar evaporator reported in the current study may have great potential in the practical field.
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