Nanoscale Research Letters
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2017
·Vol. 12
·期 1
·1-8
·
IF 2.833
Zheng H. W.,Liang X.,Yu Y. H.,Wang K.,Zhang X. A.,Men B. Q.,Diao C. L.,Peng C. X.,Yue G. T.
The present study reports Bi 5 FeTi 3 O 15 (BFTO) nanofibers/graphene (Gr) nanocomposites (BGr) as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). BFTO nanofibers with diameters of 40–100 nm were fabricated by sol-gel based electrospinning technique. The microstructure and surface morphology of the BFTO nanofibers and the BGr nanocomposites were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrochemical performances of BGr CEs were comprehensively characterized and investigated. Compared to pristine BFTO, the nanocomposites have a marked improvement in electrocatalytic performance for the reduction of triiodide because of larger surface area and lower transfer resistance on the electrolyte-electrode interface. The maximum power conversion efficiency has reached 9.56%, which is much larger than that of pure BFTO CEs (0.22%).
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BIOSENSORS & BIOELECTRONICS
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2017
·
IF 7.78
Shaoliang Dai,Shijia Wu,Nuo Duan,Jian Chen,Zhigao Zheng,Zhouping Wang
We developed an ultrasensitive luminescence resonance energy transfer (LRET) aptasensor for Ochratoxin A (OTA) detection, using core/shell upconversion nanoparticles (CS-UCNPs) as luminophores. The OTA aptamer was tagged to CS-UCNPs as energy donor and graphene oxide (GO) acted as energy acceptor. The π-π stacking interaction between the aptamer and GO brought CS-UCNPs and GO in close proximity hence initiated the LRET process resulting in quenching of CS-UCNPs luminescence. A linear calibration was obtained between the luminescence intensity and the logarithm of OTA concentration in the range from 0.001 ng mL −1 to 250 ng mL −1 , with a detection limit of 0.001 ng mL −1 . The aptasensor showed good specificity towards OTA in beer samples. The ultrahigh sensitivity and pronounced robustness in beer sample matrix suggested promising prospect of the aptasensor inpractical applications.
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Nano Energy
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2016
·
IF 11.553
Jun Jiang,Shu Lu,Han Gao,Xing Zhang,Han-Qing Yu
High-performance and cost-effective electrocatalysts are essential for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Herein, we provide the first report about a facile colloidal method to fabricate 2D ultrathin ternary FeNiS 2 nanosheets (NSs). When serving as an OER catalyst under alkaline conditions, they exhibited superior electrocatalytic performance over RuO 2 and achieved a current density of 10 mA cm −2 with a potential of 1.54 V and a Tafel slope of 46 mV decade − 1 . Meanwhile, an ORR catalytic activity was also achieved with an onset potential of 0.78 V, a Tafel slope of 107 mV decade − 1 , and a high selectivity with electron transfer number of 3.92 and H 2 O 2 % of 3.6% at 0.3 V under neutral conditions, which were comparable to those of the commercial Pt/C. The ternary FeNiS 2 -NSs were superior over the binary FeS NSs and Ni 9 S 8 nanorods synthesized via the same routes. More importantly, with the resistance for the corrosion and poison from the alkaline and phosphate buffer solution , the FeNiS 2 NSs exhibited superior stability without apparent OER or ORR catalytic activity loss over long-term operation. Their enhanced electrocatalytic performance compared to their binary counterparts indicate that a new strategy to prepare high performance OER and ORR catalysts was developed. In addition, the as-prepared FeNiS 2 NSs could serve as a noble-metal-free catalyst for OER or ORR with good electrocatalytic activities and long-term stability for practical applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Sha-Sha Yi,Jun-Min Yan,Ba-Ri Wulan,Si-Jia Li,Kai-Hua Liu,Qing Jiang
Photocatalytic hydrogen generation from water is an important solar-to-chemical conversion process, and is also a sustainable and environment-friendly generation approach for energy source of hydrogen. Herein, for the first time, we report the noble-metal-free CoP/g-C 3 N 4 hybrid as a photocatalyst for the highly efficient hydrogen generation by water splitting under visible light irradiation, whose hydrogen generation rate is ∼131 times higher than that of pure g-C 3 N 4 , and is even better than that of Pt/g-C 3 N 4 . Based on the detailed analyses of photoluminescence (PL) spectra, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photocurrent-time ( i-t ) curves, and electrochemical impedance spectroscopy (EIS) Nyquist plots, the reason for the high efficiency of CoP/g-C 3 N 4 is found to be its good absorption ability of visible light, highly effective separation and low recombination rate of photo-generated electron-hole pairs due to the addition of CoP to g-C 3 N 4 .
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CHEMOSPHERE
·
2016
·
IF 3.698
Yaolan Niu,Diwen Ying,Kan Li,Yalin Wang,Jinping Jia
Functional PET fiber (PET–AA–CS) was prepared by oxygen–plasma pretreatment and grafting of acrylic acid (AA) and low–molecular–weight chitosan (LMCS) on the polyethylene glycol terephthalate (PET) substrate. This adsorbent was targeted for quick removal of metal ion in river pollutions with an easy recycling of the fiber after emergency processing. The fabricated PET–AA–CS was characterized by the scanning electron microscope (SEM), contact angle, fourier transform infrared (FTIR) spectra and X–ray photoelectron spectroscopy (XPS) to look into its morphology, surface functional groups, and adsorption mechanism of copper ions from the aqueous solution. The overall adsorption process of copper ions on the PET–AA–CS was pH–dependent with an optimal pH value of 5.0, at which a maximum capacity of 68.97 mg g −1 was obtained. The result of fitting also shows that adsorption process follows the Langmuir isotherm and pseudo–second–order model. Moreover, the material shows good stability during 5 cycles of adsorption and desorption, and also shows no significant effect of co–existing ions including Ca 2+ , Mg 2+ , K + , Cl − , and et al. In general, PET–AA–CS developed in this study shows significant benefit of eco–friend and cost-efficiency for fast removal of copper ions in potential river metal pollutions comparing with traditional adsorbents.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Yajun Chen,Fenghe Wang,Lunchao Duan,Hao Yang,Jay Gao
As an agricultural waste, rice husk ash (RHA) has the potential to be a viable alternative adsorbent for the removal of tetracycline (TC) from aqueous solution. This study aims to explore its feasibility of RHA as a new adsorbent, and understand its adsorption mechanism for TC. Also assessed in this study are the influences of initial concentration of TC, adsorption time, solution pH and temperature on RHA adsorption performance. It is found that TC removal efficiency of RHA is related to the initial concentration of TC solution. TC concentration decreases sharply within the first 60 min in its adsorption process, and then only gradually, reaching the equilibrium within 600 min. RHA adsorption capacity is related to solution pH, temperature, and ion intensity, especially at a high pH value. A rise of 313 K in temperature caused the adsorption capacity to more than double. Furthermore, low-acid and high-alkaline solution can accelerate the adsorption of TC onto RHA. The highest adsorption capacity of 8.37 mg/g achieved in this study is much higher than other adsorbates reported in the literature, indicating the feasibility of RHA as a new adsorbent. The Langmuir isotherm model is the most reasonable in depicting the adsorption behavior . The pseudo second order model fits the experimental data nicely, suggesting a mostly physical and chemical control over the adsorption. Such findings can serve as a useful guide in expanding the applicability of RHA to new areas.
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RSC Advances
·
2016
·Vol. 6
·期 74
·70271-70276
·
IF 3.289
Ying Huang,Zhaohui Wang,Changling Fang,Wenqian Liu,Xiaoyi Lou,Jianshe Liu
Addition order of reagents in the Acid Orange 7 (AO7) degradation process was investigated by varying the concentration of Fe(II), the Fe(II)/peroxymonosulfate (PMS) molar ratio and stepwise addition of Fe(II) and PMS. The importance of addition order of reagents was confirmed and an order of Fe(II)–PMS to improve the oxidation efficiency was recommended.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Zhenhao Xia,Xiaoyong Tian,Peipei Xu,Baijie Cheng,Hongyao Xu,Shanyi Guang
In this era of high drug resistance, there is an urgent need for novel antimicrobial agents and strategies to achieve smarter sterilization effects. However, developing an environmentally friendly, controllable, and self-cleaning smart antimicrobial material remains a formidable challenge. In this work, a smart antimicrobial nanoplatform composed of Cu 3 Mo 2 O 9 and MoS 2 has been successfully designed and synthesized. The computational findings reveal that, owing to the interfacial coupling between the two substances at the solid junction, this architecture can effectively absorb near-infrared light, significantly reduce migration resistance, and improve carrier separation efficiency. Empirical observations demonstrate that with a sample concentration of 100 μg/mL, under near-infrared (NIR) laser irradiation, the microenvironmental temperature proximal to the bacteria can be swiftly elevated from 28.6 °C to in excess of 50 °C within a mere 6 min. The overall photothermal conversion efficiency is 32.6 %, and it exhibits an active oxygen level nearly 5 times higher than that of Cu 3 Mo 2 O 9 . Furthermore, the permeability of the cell membrane was greatly improved with the increased temperature, which is beneficial for the generated reactive oxygen species (ROS) entering the bacterial cells. After synergistic antimicrobial treatment, the antibacterial rate against Escherichia coli can reach over 99 %. More importantly, this nano-platform features a unique ’activation’ mechanism that uses NIR as an ’activation switch’ to selectively toggle between ’passive defense,’ ’secondary sterilization,’ and ’active attack’ antibacterial modes as needed. Upon interaction with aqueous environments, its reusability and favorable biocompatibility with terrestrial and aquatic life promise to facilitate the intelligent eradication of deleterious microorganisms in aquatic systems via the diurnal cycle of sunrise and sunset. This is highly significant for the ongoing management and maintenance of public resources such as amusement parks, artificial fish ponds, and urban water features.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xu Liu,Yuan Zhao,Cong Gao,Xiaohuan Sun,Shixin Li,Jie Han
Understanding the unique role of supramolecular chirality in nano-protein/cell interactions, as opposed to molecular chirality, is crucial for elucidating the origin of life. However, this aspect has received inadequate attention. In this study, L/D-glutamic acid-based amphiphiles (L/D-GluC16), which possess molecular chirality, were synthesized. Additionally, through the manipulation of solvent effects, left/right-handed helical nanofibers ( M / P -GluC16), endowed with supramolecular chirality, were assembled from L/D-GluC16. With the aid of molecular dynamics (MD) simulations, the interaction between M / P -GluC16, L/D-GluC16, and a model protein (bovine serum albumin, BSA) was investigated at the thermodynamic and spatial orientational levels. Combined with the experimental result of protein adsorption efficiency, a more favorable chirality-dependent binding of M / P -GluC16 to protein compared to L/D-GluC16 was confirmed. Furthermore, driven by the binding-induced conformational changes and subsequent functional disruptions of proteins, M / P -GluC16 exhibited a greater chirality-specific cancer cell inhibitory efficacy compared to L/D-GluC16, highlighting the more significant impact of supramolecular chirality on nano-protein/cell interactions than molecular chirality.
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EUROPEAN POLYMER JOURNAL
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2024
·
IF 5.8
Baopeng Guo,Yongjia Liu,Siyu Han,Peng Wu,Wei Xu,Xian Ma,Zhiyu Zhang,Shigao Peng,Jianshe Hu,Siwen Chen,Liqun Yang
The healing process of bacterial infection wounds is a complex and chronic issue that poses a significant threat to human health. Thermosensitive antibacterial hydrogels, which transition from sol to gel at body temperature, have emerged as a promising option for wound dressing to accelerate healing and prevent infections. In this paper, we present a thermosensitive hydrogel (PTPH) made from (Polyethylene glycol monomethyl ether)- b -(polytrimethylene carbonate)- b -(polyethylene glycol monomethyl ether) (mPEG 12 -PTMC n -mPEG 12 , PTP) triblock copolymers, showing gel transition properties at around 34 °C. Additionally, (spermidine)-( ortho -phenylenediamine) carbon dots (SCDs) were enclosed within PTPH (PTPH-SCDs) to provide antibacterial activity against Escherichia coli and Staphylococcus aureus. In vitro experiments demonstrated that PTPH-SCDs have good skin adhesion, excellent biocompatibility, and exceptional antimicrobial efficacy. In vivo studies on a Sprague-Dawley rat model infected with Staphylococcus aureus showed that PTPH-SCDs dressings enhance the healing of infected wounds by inhibiting bacterial proliferation, promoting collagen deposition, and stimulating angiogenesis. This research presents a novel approach for developing multifunctional wound dressing by incorporating carbon dots into aliphatic polycarbonate based temperature-responsive hydrogels for the treatment of infected wounds.
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PLoS One
·
2024
·Vol. 19
·期 5
·e0304113
·
IF 2.9
Boyu Zhao,Ye Wang,Jingyi Zhang,Lixia Wang,Wangdui Basang,Yanbin Zhu,Yunhang Gao
Microbial degradation of tylosin (TYL) is a safe and environmentally friendly technology for remediating environmental pollution. Kurthia gibsonii (TYL-A1) and Klebsiella pneumonia (TYL-B2) were isolated from wastewater; degradation efficiency of the two strains combined was significantly greater than either alone and resulted in degradation products that were less toxic than TYL. With Polyvinyl alcohol (PVA)—sodium alginate (SA)—activated carbon (AC) used to form a bacterial immobilization carrier, the immobilized bacterial alliance reached 95.9% degradation efficiency in 1 d and could be reused for four cycles, with > 93% degradation efficiency per cycle. In a wastewater application, the immobilized bacterial alliance degraded 67.0% TYL in 9 d. There were significant advantages for the immobilized bacterial alliance at pH 5 or 9, with 20 or 40 g/L NaCl, or with 10 or 50 mg/L doxycycline. In summary, in this study, a bacterial consortium with TYL degradation ability was constructed using PVA-SA-AC as an immobilized carrier, and the application effect was evaluated on farm wastewater with a view to providing application guidance in environmental remediation.
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ACS Catalysis
·
2024
·
IF 11.3
Yi Qin,Cheng-Hao Chuang,Xiaojing Liu,Xian Liang,Linfeng Xie,Kuan Wang,Chih-Wen Pao,Ying-Rui Lu,Yang Liu,Yawei Chen,Zhanwu Lei,Pengfei Yan,Liang Wu,Shuhong Jiao,Qing Li,Ruiguo Cao
Molecular catalysts have attracted significant attention because of their high activity, selectivity, and tunability. However, in heterogeneous catalysis, the uniform dispersion and immobilization of molecular catalysts on the supporting substrate remain a significant challenge due to their aggregation tendency. Here, we present a facile strategy to molecularly disperse and immobilize a series of macrocyclic metal complexes onto reduced graphene oxide (rGO) by using DNA as a mediator. The electroactive amounts of molecularly dispersed iron phthalocyanine (FePc) molecules are increased by ∼50 times greater than that of pristine FePc catalyst. As a result, the single-molecule catalyst demonstrates a notable power density (∼290 mW cm–2) in an H2/O2 alkaline polymer electrolyte fuel cell. Operando X-ray absorption spectroscopy experiments combined with density functional theory calculations reveal that the coordination interaction between FePc and DNA enables the molecular dispersion and immobilization of FePc on the surface of rGO, and consequently improves the activity by regulating the electronic structure of active centers. This study points out a facile strategy to tackle the fundamental challenges facing molecular catalysts in long-lasting energy conversion technologies.
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