NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 43
·20610-20622
·
IF 3.925
Rongqian Meng,Yanfeng Xue,Lijun Guo,Hong Yang,Yongbo Song,Qiaoling Li,Yulan Niu
A novel electrochemical sensor was constructed based on an overoxidized polypyrrole/overoxidized poly(3,4-ethylenedioxythiophene)/graphene quantum dots-chitosan composite film modified glass carbon electrode (oPPy/oPEDOT/GQDs-CS/GCE), for the accurate determination of luteolin in peanut shells. The oPPy/oPEDOT/GQDs-CS/GCE was prepared using layer-by-layer assembly methods. After incubation in NaOH–EtOH solution, the current of luteolin on the composite electrode increased from 0 to ∼30 μA, the Rct value decreased by ∼80 fold, and the specific surface area (A) increased by ∼7 fold. Based on a three-level four-factor Box–Behnken design (BBD), the optimal preparation conditions for the composite electrode were as follows: a mass ratio of CS to GQDs of 5, a polymerization cycle number for EDOT of 4, a polymerization cycle number for Py of 4, with the peak current increased to 43.21 μA (RSD = 3.51%, n = 3). A morphology with multi-channels and grooves was observed on the surface of the incubated composite film via SEM analysis. The additional –CN– and –SO/–SO2 groups formed were observed by XPS and FTIR analysis. The electrochemical sensor constructed exhibited good anti-interference ability, repeatability, and stability. The linear detection range recorded by the current responses of the composite electrode to luteolin was 0.01 to 10.0 μM (R2 = 0.991) and the limit of detection was 7.5 nM (S/N = 3). The observed content of luteolin in peanut shells was 0.769%, which was close to the results obtained from High Performance Liquid Chromatography (HPLC) analysis (0.808%). This agreement indicated that the constructed electrochemical sensor based on oPPy/oPEDOT/GQDS-CS/GCE was capable of accurate detection of luteolin in peanut shells.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-9
·
IF 6.408
Wang Jiasheng,Zhang Decheng,Xu Keke,Hui Ni,Wang Dongwei
Dual-mode electrochemical aptasensor based on nitrogen-doped graphene (NG) doped with the conducting polymer polypyrrole (PPy) nanocomposite is proposed for the determination of acetamiprid. NG/PPy was electrodeposited onto the glassy carbon electrode (GCE) using cyclic voltammetry technique. NG/PPy/GCE showed outstanding electrocatalytic activity for the oxidation of nitrite due to “active region” induced by the charge redistribution of carbon atoms. The ultrasensitive dual-mode biosensor for acetamiprid could be easily developed by coupling acetamiprid aptamers with the NG/PPy hybrid. The specific binding between acetamiprid and the aptamers resulted in the increase of differential pulse voltammetry (DPV) signal change and the decrease of chronoamperometry (CA) signal, and the concentration of acetamiprid could be measured. The working potentials of DPV and CA were − 0.2 ~ 0.4 V and − 0.4 ~ 0.4 V (vs. SCE), respectively. The dual-mode acetamiprid biosensor showed a wide linear range from 10 −12 to 10 −7 g mL −1 , with low detection limits of 1.15 × 10 −13 g mL −1 and 7.32 × 10 −13 g mL −1 through DPV and CA modes, respectively. Moreover, owing to high active area and superior conductivity, as well as good electrocatalytic ability, the dual-sensing platform based on NG/PPy nanocomposite supported the quantification of acetamiprid in complex samples. Graphical abstract A dual-mode electrochemical aptasensor based on NG/PPy nanocomposite for acetamiprid detection was proposed through both the increase of differential pulse voltammetry (DPV) signal change and the decrease of chronoamperometry (CA) signal of the nitrite oxidation electrocatalyzed by NG/PPyn in sensors and biosensors.
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FUEL
·
2022
·
IF 8.035
Xiaofeng Zhang,Hengfei Zhang,Bo Qiu,Dandan Zhu,Sheng Zhang,Yunpeng Bian,Junhong Wang,Dajian Li,Shimin Wang,Wenpeng Mai,Jian Chen,Tao Li
The conversion of CO 2 cycloaddition to value-added cyclic carbonates is of considerable interest owing to the renewable greenhouse gas and 100 % atomic economy. However, it is still a big challenge to develop low-cost and high-efficient catalysts. Here, we report a facile design way, in a single step, for the creation of robust catalytic nanoreactors for heterogeneous catalyst in the cycloaddition of CO 2 to cyclic carbonates. The Al(III) - porphyrin-based porous organic polymer catalysts exhibited remarkably high efficiency for propylene carbonate with turnover frequencies of up to 443.6 h −1 at room temperature and atmospheric pressure without solvent, which notably surpasses most previously reported heterogeneous catalysts and relevant homogeneous catalysts. Even using dilute CO 2 (15 % CO 2 in N 2 ), a TOF up to 27.0 h −1 could be afforded under ambient conditions (25 °C, 1 bar) by Al-Por-POP-2, which showed high stability for recyclability up to 10 times without a significant decrease. These studies provided a simple and efficient synthetic strategy in favor of mass production and future industrial application for the cycloaddition of CO 2 with low cost and high efficiency.
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MACROMOLECULAR BIOSCIENCE
·
2022
·Vol. 23
·期 2
·2200349
·
IF 5.859
Zhicong Lin,Donghao Fan,Guojiao Li,Liming He,Xianyan Qin,Bin Zhao,Qin Wang,Wenlang Liang
Diabetic mellitus is one of the leading causes of chronic wounds and remains a challenging issue to be resolved. Herein, a hydrogel with conformal tissue adhesivity, skin-like conductivity, robust mechanical characteristics, as well as active antibacterial function is developed. In this hydrogel, silver nanoparticles decorated polypyrrole nanotubes (AgPPy) and cobalt ions (Co 2+ ) are introduced into an in situ polymerized poly(acrylic acid) (PAA) and branched poly(ethylenimine) (PEI) network (PPCA hydrogel). The PPCA hydrogel provides active antibacterial function through synergic effects from protonated PEI and AgPPy nanotubes, with a tissue-like mechanical property (≈16.8 ± 4.5 kPa) and skin-like electrical conductivity (≈0.048 S m −1 ). The tensile and shear adhesive strength (≈15.88 and ≈12.76 kPa, respectively) of the PPCA hydrogel is about two- to threefold better than that of fibrin glue. In vitro studies show the PPCA hydrogel is highly effective against both gram-positive and gram-negative bacteria. In vivo results demonstrate that the PPCA hydrogel promotes diabetic wounds with accelerated healing, with notable inflammatory reduction and prominent angiogenesis regeneration. These results suggest the PPCA hydrogel provide a promising approach to promote diabetic wound healing.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ruimeng Wang,Xinqi Luan,Jingyu Bao,Yaseen Muhammad,Syed Jalil Shah,Guanchen Wang,Jing Li,Guoyou Lin,Hongbing Ji,Zhenxia Zhao
High capacity adsorption of volatile organic compounds (VOCs) in high humidity environment is a crux but challenge for atmospheric VOCs governance. In this work, tubular carbonized N-doped polymers (TCNP) were implanted into MIL-101 via N-Cr-O interface self-assembly, enabling high adsorption for vapor toluene in high humidity. Through mechanical ball milling and carbonization, Cr ions were preloaded on TCNP to form highly dispersed 3–5 nm Cr-N crystallite as anchors for growing MIL-101(Cr/Cu). Newly constructed smaller micropores of 6.8 Å with aromatic rings/N sites at the interface and doped Cu ions in MOF framework synergistically enhanced π-π conjugation and electrostatic interaction for C 7 H 8 molecules. This endowed [TCNP 5 /MIL(Cr/Cu)] N-Cr 2.9 times higher toluene uptake (6.34 mmol/g) at low vapor pressure ( P / P 0 = 0.02) and 1.9 times diffusivity under high humidity (60% RH) than that of MIL-101(Cr) at 298 K. The adsorption breakthrough curves for vaporous toluene showed that TCNP@MIL-101(Cr/Cu) exhibited outstandingly higher adsorption equilibrium capacity (2.7 mmol/g) under 80% RH, corresponding to approximately 2–10 times than those of reported state-of-the-art adsorbents under similar conditions. This study provided a novel interface construction strategy for hydrophobic MOF composites, which supplied deeper understanding for VOCs adsorption and promoted MOFs practical application in VOCs capture under humid environment.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
·
IF 17.694
Yang Baiyu,Chen Ling,Xue Songlin,Sun Hao,Feng Kun,Chen Yufeng,Zhang Xiang,Xiao Long,Qin Yongze,Zhong Jun,Deng Zhao,Jiao Yan,Peng Yang
Electrocatalytic reduction of CO 2 into alcohols of high economic value offers a promising route to realize resourceful CO 2 utilization. In this study, we choose three model bicentric copper complexes based on the expanded and fluorinated porphyrin structure, but different spatial and coordination geometry, to unravel their structure-property-performance correlation in catalyzing electrochemical CO 2 reduction reactions. We show that the complexes with higher intramolecular tension and coordination asymmetry manifests a lower electrochemical stability and thus more active Cu centers, which can be reduced during electrolysis to form Cu clusters accompanied by partially-reduced or fragmented ligands. We demonstrate the hybrid structure of Cu cluster and partially reduced O-containing hexaphyrin ligand is highly potent in converting CO 2 into alcohols, up to 32.5% ethanol and 18.3% n- propanol in Faradaic efficiencies that have been rarely reported. More importantly, we uncover an interplay between the inorganic and organic phases to synergistically produce alcohols, of which the intermediates are stabilized by a confined space to afford extra O-Cu bonding. This study underlines the exploitation of structure-dependent electrochemical property to steer the CO 2 reduction pathway, as well as a potential generic tactic to target alcohol synthesis by constructing organic/inorganic Cu hybrids.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Du Huang,Zhenya Lu,Xingyue Liu,Junning Gao,Zhiwu Chen,Xin Wang,Xiaoyi Fu
NiCo 2 O 4 nanoflowers with high specific surface area were prepared on nickel foam (NF) by hydrothermal method and used as frameworks for developing cathode and anode of flexible asymmetric supercapacitor. With the unique nanoflower-like NiCo 2 O 4 arrays as skeleton, the NiCo 2 O 4 /Au/MnO 2 cathode was prepared by gold-spraying and electrochemical deposition and the NiCo 2 S 4 /PPy anode was prepared by second-hydrothermal and electro-polymerization. The hierarchical structured electrodes offer sufficient redox sites and adequate channels for accelerating ion and electron transport between electrodes and electrolyte. Moreover, the NiCo 2 S 4 /PPy was first reported as the anode, and its cycling stability (capacitance retention of 86.04 % after 5000 cycles) and specific capacitance (1612.5F/g at 1 A/g). The assembled flexible all-solid-state asymmetric supercapacitor (NiCo 2 O 4 /Au/MnO 2 // NiCo 2 S 4 /PPy) displays a high energy density of 206.37 Wh kg −1 at a power density of 398.57 W kg −1 and an outstanding cyclability (capacitance retention of 83.41 % after 5000 cycles).
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Xinchang Kang,Xiaojun Li,Can Liu,Min Cai,Pengfei Guan,Yian Luo,Youjun Guan,Yu Tian,Kunyu Ren,Chengyun Ning,Lei Fan,Guoxin Tan,Lei Zhou
In recent years, electrically conductive hydrogel-based nerve guidance conduits (NGCs) have yielded promising results for treating peripheral nerve injuries (PNIs). However, developed ones are generally pre-manufactured and exhibit a limited ability to achieve good contact with nerve tissue with irregular surfaces. Herein, we developed a plasticine-like electrically conductive hydrogel consisting of gelatin, conducting polypyrrole , and tannic acid (named GPT) and assessed its ability to promote peripheral nerve regeneration. The shape-persistent GPT hydrogel exhibited good self-healing properties and could easily be molded to form a conduit that could match any injured nerve tissue. Their electrical properties could be tuned by changing the PPy concentration. In vitro , the improved conductivity of the hydrogel promoted dorsal root ganglion (DRG) axonal extension. More importantly, we found that the GPT hydrogel enhanced axonal regeneration and remyelination in vivo , preventing denervation atrophy and enhancing functional recovery in a mice model of sciatic nerve injury. These results suggest that our plasticine-like NGC has huge prospects for clinical application in the repair of PNI.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuang Yang,Jiangmin Jiang,Wenjie He,Langyuan Wu,Yinghong Xu,Bing Ding,Hui Dou,Xiaogang Zhang
With the associated advantages of low costs and abundant resources, sodium-ion capacitors (SICs) present a suitable means for large-scale energy storage. However, their practical application is still significantly limited by the sluggish electrochemical reaction kinetics of battery-type anodes. Herein, the nitrogen-doped carbon-encapsulated Fe 7 Se 8 nanorods (Fe 7 Se 8 @NC) with a core–shell structure were prepared via an in-situ self-polymerization and carbonization–selenization approach, which improves ion transport and maintains the structural stability of the nanorods. The designed Fe 7 Se 8 @NC nanorods exhibit desirable rate capability with a capacity of 290.7 mAh/g at 10 A/g and long-term cyclability with 84.6 % retention over 6000 cycles at 5 A/g. Moreover, research has shown that the diffusion dynamics of Na + is improved in ether-based electrolytes and that the irreversible reactions at low voltages can be inhibited by a high discharge cut-off voltage. Furthermore, we demonstrated the specific sodium storage mechanism and excellent electrochemical reversibility of the Fe 7 Se 8 @NC electrode through in-situ and ex-situ characterization techniques. As expected, the assembled SICs with the Fe 7 Se 8 @NC anode and active carbon cathode deliver prominent energy/power densities and an ultra-long cycle life over 5000 cycles, shedding new light on the design of transition metal dichalcogenides as anode materials for advanced energy storage systems.
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Journal of Cleaner Production
·
2022
·
IF 11.072
Jun Xiong,Jie Yi,Shuai Peng,Zhihui Yang,Yuming Wu,Weiming Wang,Shaofang Lv,Junjun Peng,Chen Xue,Xue Min,Ming Li,Takayoshi Nakamura
Solar steam production is regarded as a potential approach for extracting freshwater from undrinkable water. However, it remains a challenge to acquire a low-cost, salt-resistant, durable and efficient solar evaporator through a simple fabrication process. This work presents a plant transpiration-inspired three-dimensional (3D) solar evaporator fabricated by decorating industrial polyester fiber bundles (PFBs) with inexpensive polypyrrole (PPy). This solar evaporator is named the PPy-PFBs. Intriguingly, PFBs composed of hydrophobic polyester fibers with multiple vertical channels are capable of pumping enough water to the top of the solar evaporator through the capillary effect and storing seven times its mass of water, allowing for salt-resistant. In addition, polyester fiber is resistant to acid, alkali, mildew, and sunlight, making the PPy-PFBs durable. Along with the heat generated from sunlight absorbed by the PPy, the 3D solar evaporator can also gain energy from the environment. Adjusting the exposure height and arrangement of PPy-PFBs can control the evaporation rate . The matrix arranged PPy-PFBs with an exposure height of 6 cm attains a high water evaporation rate of 3.77 kg m −2 h −1 with an energy conversion efficiency of 155.77%. Outdoor experiments demonstrate that the PPy-PFBs can extract freshwater from non-drinkable water. 1 m 2 of PPy-PFBs can produce about 26 kg of fresh water per day, which is enough to meet the daily drinking water needs of 10 adults. This low-cost, easily made, salt-resistant, durable and high evaporation rate solar evaporator is appealing to alleviate the global freshwater crisis.
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MATERIALS TECHNOLOGY
·
2022
·
IF 3.297
Yian Liu,Xu Ji,Huanyin Sun,Xiao Lin
Herein, we present the synthesis of PPy@MoO3 nanocomposites through a novel situ polymerisation growth. The introduction of polypyrrole (PPy) not only greatly improved the electrical conductivity of the material but also significantly improved the electrochemical activity, thus promoting the storage of energy reaction. The results exhibit that the electrode material has a very high specific capacitance (453.75 F/g at 1 A/g) and an excellent cycle life (84.3% of the initial specific capacitance after 5000 cycles). Notably, based on the rise of high-safety all-solid supercapacitors, it has great potential in the portable/wearable field. The PPy@MoO3//AC all-solid supercapacitors have the power density of 400 W/kg at an energy density of 20.3 Wh/kg. The distinguished performances stem from the synergetic merits of the morphology, structure, and mechanism of PPy@MoO3. PPy@MoO3 is expected to be a promising anode material and provide a theoretical basis for the scalable research and applications of MoO3-based anode materials for all-solid supercapacitors.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Ming Zhang,Lei Shi,Xiling Du,Zhongrui Li,Yanhua Shi,Congcong An,Jian Li,Chengyu Wang,Junyou Shi
Directional transport of liquid is crucial for many applications including seawater desalination, oil/water separation, fog collection, membrane distillation and so forth. Particularly, Janus wood membranes, with asymmetric special wetting property on two sides, and mechanically robust bio-based substrate with ample pores and open nano-/micro-channels, present enticing opportunities to address this challenge. In this study, we report a Janus mesoporous wood-based membrane demonstrating the capabilities for simultaneous oil/water separation, aromatic dyes removal, and seawater desalination. Thanks to the inner driving force arising from the asymmetric special wettability, unique wood microchannels for the transpiration of trees, and the synergistic effect of PPy and Ag/AgCl NPs anchored to wood matrix, Janus mesoporous wood-based membrane would promote the desired transport without any external energy input for high-efficiency seawater desalination and switchable oil/water separation. Meanwhile, the aromatic dyes and other organic compounds in industrial wastewater or polluted seawater would get more opportunities to contact with the anchored Ag/AgCl NPs during flowing through the wood microchannels. Above advantages endow the Janus mesoporous wood-based membrane with excellent pollutant degradation efficiency (MB: 86.4 %, RhB : 91.9 %), high solar conversion efficiency (95.33 %), outstanding separation efficiency towards oil-in-water emulsion (∼99.51 %), remarkable oil adsorption capacity (∼8 times of its own weight), and great antibacterial efficiencies (E. coli: 99.87 %, S. aureus : 99.78 %, B. subtilis: 99.96 %). Results also show that this Janus mesoporous wood-based membrane has the satisfactory resistance to acid and base, robust mechanical structure, good recycling stability, high salinity tolerance and remarkable self-desalting capability. This study represents a new avenue for fabrication and design of Janus wood-based photothermal materials, and certainly will contribute to alleviating the global water and energy shortage issue.
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