SURFACE & COATINGS TECHNOLOGY
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2021
·
IF 4.158
Dexin Chen,Yaoxin Li,Hongyuan He,Wei Li,Rong Zeng,Xiaojian Wang
Silver antibacterial composite coatings were prepared on additive manufactured Ti6Al4V substrates by merging anodic oxidation , molecular grafting, and spray deposition methods. The surface microstructure, composition, elemental characteristics, and antibacterial properties of the composite coatings were obtained. When the anodizing time was varied from 0.5 to 4 h, the results revealed that the average inner diameter of TiO 2 nanotubes (TNTs) increased from 19.9 nm to 78 nm and the average wall thickness decreased from 22.9 nm to 12.8 nm, concluding the optimized voltage of 40 V and anodizing time of 1 h. X-ray diffraction spectra depicted that the structure of TNTs transformed to the more stable anatase phase with a small amount of rutile phase after annealing. After molecule grafting, silanes are covalently bonding to the TNTs via amino groups and Si-O-Si networks. With the help of the covalent bonding between Ag and TNTs, the Ag + release has been slowed down significantly from 1.127 ppm to 0.17 ppm. Bare TNTs show a certain antibacterial effect with an antibacterial rate of 57.5% for E. coli and of 50.1% for S. aureus . When the spraying pass for Ag deposition is 10, the prepared AgNPs embedded coatings have significantly improved the antibacterial properties, as the antibacterial efficiencies are 100% for all these silane-modified TNTs surfaces.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Li Zhang,Weiwei Lu,Peng Xu,Hao Wang,Xuefeng Wei,Kaisheng Yao,Shuge Peng
In this study, we propose a novel photo-activation method to remove persistent organic pollutants through a SO4˙ˉ-based advanced oxidation process . Core–shell Ag@Pd nanocubes were prepared by a facile seed-mediated method and, afterward, explored for photodegradation of a representative ionic liquid (IL), [C 4 mim]Br. Electron paramagnetic resonance measurements and radical scavenging experiments demonstrated that the species mainly responsible for degrading [C 4 mim]Br were the radicals of SO4˙ˉ. The plasmon-mediated nature of the Ag@Pd catalysts was verified by their wavelength-dependent performance. Subsequent optical simulation indicated that, other than the plasmonic Ag core, the non-plasmonic Pd shell was the preferential site for dissipating the absorbed photons into energetic charge carriers to produce the radical species. Finally, based on the detected intermediates, we propose the degradation pathway of ILs in the plasmon-mediated process. The results of our method suggest favorable application in the treatment of wastewater.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Congyu Wang,Zepeng Rao,Asad Mahmood,Xiao Wang,Yan Wang,Xiaofeng Xie,Jing Sun
In the process of photocatalytic oxidation (PCO), titanium dioxide (TiO 2 ) shows excellent capabilities. However, when TiO 2 is used to remove volatile organic compounds (VOCs), there are some drawbacks including weak adsorption of gaseous contaminants, insufficient utilization of sunlight, and rapid recombination of photogenerated carriers. Herein, a TiO 2 -based ternary heterogeneous photocatalyst, g-C 3 N 4 /Ag-TiO 2 , was successfully fabricated to photodegrade gaseous acetaldehyde (one of the representatives of oxygenated VOCs) under visible light. Among the various samples, the g-C 3 N 4 /50 wt% Ag-TiO 2 exhibited an excellent photocatalytic activity , which was 5.8 times of bare TiO 2 . The mineralization efficiency of acetaldehyde was also increased by 3.7 times compared to bare TiO 2 . The substantial improvement in the PCO performance of the ternary system can be associated with the good adsorption to acetaldehyde gas and light-harvesting capability, as well as improved charge separation process. The application of Langmuir-Hinshelwood kinetic model suggested that relative humidity played a significant role in the VOCs degradation. Also, the photodegradation of gaseous acetaldehyde primarily occurred on the catalysts surface. Based on several characterizations, i.e., UV–vis spectroscopy, photoluminescence spectrum, photocurrent spectroscopy and electron spin-resonance test, a suitable degradation mechanism is proposed. This study provides a novel ternary photocatalyst with improved photocatalytic performance and stability, which can be used for the low-concentration VOCs abatement in the indoor environment.
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PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2021
·Vol. 50
·期 6
·3222-3227
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IF 1.938
Han Wensong,Guo Qin,Su Tianhui
Cu@HBP-SH@Ag particles have been prepared by a facile synthesis strategy. Initially, thiol-terminated hyperbranched polymer (HBP-SH) was synthesized by stepwise polymerization. Subsequently, Cu particles covered with HBP-SH were prepared by reduction technology using HBP-SH as dispersant and template. Finally, Cu@HBP-SH@Ag particles were obtained by reduction reaction. Fourier-transform infrared (FT-IR) and ultraviolet–visible (UV–Vis) spectroscopy confirmed presence of HBP-SH on the surface of the Cu particles. The crystal structure was examined by x-ray diffraction (XRD) analysis. Scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS) analysis confirmed formation of Cu@HBP-SH@Ag particles. Thermogravimetric analysis (TGA) showed that the Cu@HBP-SH@Ag particles had better antioxidation properties than the Cu particles.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Xu Chen,Jianliang Bai,Guojun Yuan,Lu Zhang,Lili Ren
Herein, a novel nitrogen-doped carbon dots (N-CDs) nanosensor for detecting Ag + and glutathione (GSH) has been designed. Interestingly, Ag + could significantly improve the fluorescence (FL) intensity of the N-CDs we prepared, which is different from most other metal ions with FL quenching effects on N-CDs. The sensing mechanism can be attributed to the oxidation characteristics of Ag + and the formation of silver nanoparticles (AgNPs). In the reaction, the N-CDs acted as the reducing agent and stabilizer. Under the optimal conditions, the N-CDs could detect Ag + with a nice linear relationship of R 2 = 0.992 and the limit of detection was 0.091 μM. Furthermore, the FL of N-CDs solutions could return to nearly original intensity after introducing glutathione (GSH), which allowed the N-CDs to be applied for GSH detection sensitively and selectively. In addition, the N-CDs were also successfully applied to cellular multicolor imaging of Hela cells. The results reported here pave the way for N-CDs-based fluorescent “off-on-off” sensor in environment, bioassay and bioimaging.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Sihan Ma,Zonglang Zhou,Guang Ran,Jun Xie,Xian Luo,Yipeng Li,Xin Wang,Huiqin Zhuo,Jianghua Yan,Lin Wang
The development of highly efficient photonic nanomaterials with synergistic biological effects is critical and challenging task for public hygiene health well-being and has attracted extensive interest. In this study, a type of near-infrared (NIR) driven, virus-like heterojunction was first developed for synergistic biological application. The Ag-coated Bi 2 CO 5 nanomaterial (BOCO@Ag) demonstrated good biocompatibility, low cytotoxicity, high antibacterial activity and excellent light utilization stability. The synthesized BOCO@Ag performed a potential high photothermal conversion (efficiency~46.81%) to generate high temperatures when irradiated with near-infrared light illumination. As expected, compared to single Ag+ disinfection, BOCO@Ag can exhibit better antibacterial performance when combined with photothermal energy and released Ag+ . These results suggest that BOCO@Ag can be a promising photo-activate antimicrobial candidate and provide security for humans health and the environment treatment.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xian Fang,Zhongrun Zeng,Qiuju Li,Ying Liu,Wenhai Chu,Thandavarayan Maiyalagan,Shun Mao
The chlorination disinfection of drinking water generates disinfection byproducts (DBPs), which are toxic, carcinogenic, mutagenic, and teratogenic. Recently, trichloroacetamide (TCAM) has been proved to be highly genotoxic and cytotoxic. In this study, a sensitive and selective electrochemical sensor for TCAM detection is reported that is based on the triangular silver nanoprism (AgNPR) and MoS 2 nanosheet (AgNPR@MoS 2 ) heterostructure. The AgNPR can catalyze the dechlorination reaction of TCAM; and the abundant S sites on the edge of MoS 2 nanosheet can absorb H + , thereby accelerating the dechlorination hydrogenation reaction. The AgNPR@MoS 2 heterostructure exhibits a high charge transfer rate, high electrocatalytic activity, and good stability in TCAM detection. The sensor shows two linear sensing ranges of 0.5−10 μM and 10−80 μM, a detection limit of 0.17 μM, and high specificity to coexist DBPs. This study is one of the first reports of electrochemical detection of TCAM, and has successfully demonstrated the significant potential of electrochemical sensor for the real-time analysis and monitoring of trace TCAM in drinking water.
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COMPOSITES COMMUNICATIONS
·
2020
·
IF 4.915
Mao Wang,Xiao-ren Pan,Xiao-dong Qi,Nan Zhang,Ting Huang,Jing-hui Yang,Yong Wang
Here we demonstrated a remarkable improvement in the dielectric performance of poly (vinylidene fluoride) (PVDF)-based composites via incorporating distinguished hybrid nanofibers , namely, Ag nanoparticles-embedded BaTiO 3 (Ag@BaTiO 3 , Ag@BT) nanofibers, which were fabricated by coaxial electrospinning technology followed by calcination . The Ag nanoparticles on BaTiO 3 nanofibers were found to play a comprehensive role on the dielectric performances, including the better dispersion of hybrid nanofibers leading to homogeneity of electric field, the formation of charge transfer complex in the hybrid region which enhanced the interfacial polarization, and the Coulomb blockade effect of Ag nanoparticles to further suppress the interfacial charge accumulation. As a result, the PVDF/Ag@BT composites exhibited high dielectric constant of 38.87@1 kHz and low loss of 0.02@1 kHz.
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CELLULOSE
·
2020
·Vol. 27
·期 17
·10047-10060
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IF 4.21
Wang Minglei,Zhang Maojiang,Gao Qianhong,Liu Yinjie,Zhang Mingxing,Shen Rongfang,Zhang Yumei,Hu Jiangtao,Wu Guozhong
Immobilization of photocatalysts on substrates is an important factor for water purification in practical applications. In this study, an efficient Ag@AgBr photocatalytic coating was attached onto the surface of cotton fabric via radiation-induced graft polymerization and subsequent chemical reactions, and the resultant product was denoted as Cot-Ag@AgBr. The graft chains acted not only as a source of bromine, but also as an intermediate layer to anchor the Ag@AgBr photocatalytic coating via strong electrostatic interactions. The immobilized Ag@AgBr photocatalytic coating exhibited outstanding photocatalytic properties for organic dye degradation under visible light irradiation. Furthermore, Cot-Ag@AgBr presented high stability and robust durability, which conferred its excellent visible-light-driven photocatalytic activity after five rounds of photodegradation. After 10 min of ultrasonication, the amount of Ag@AgBr precipitate that leached from the Cot-Ag@AgBr was < 2%. Therefore, the as-synthesized cotton fabric offered good insight into the functionalization of polymer substrates with photocatalysts and could be useful for advanced wastewater treatment under the cyclic operations.
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POWDER TECHNOLOGY
·
2020
·
IF 4.142
Xueliang Jiang,Zitong Peng,Yanrong Gao,Feng You,Chu Yao
Using melamine-formaldehyde as template, tetrabutyl titanate as titanium source, and ytterbium nitrate as ytterbium source, the Ag-loaded double-shell TiO 2 @Y 2 O 3 hollow microspheres with TiO 2 as inner layer and Y 2 O 3 as outer layer were prepared by sol-gel method and high-temperature calcinations reduction. The characterization of hollow microspheres shows that the Ag-loaded TiO 2 @Y 2 O 3 hollow microspheres show regular morphology, uniform size and distinct double-shell hollow structure. Ag exists as the zero-valent form in the double-shell hollows spheres mainly. The results of Uv-visible diffuse reflection analysis and photocatalytic testing under visible-light show that the forbidden band widths narrowed and the photocatalytic activities improved significantly after the load of Ag. Moreover, the location of loaded-Ag has great effect on the photocatalytic activity of TiO 2 @Y 2 O 3 hollow microspheres. Compared with Ag located on the surface of the hollow microspheres, Ag located between the two shells of the hollow microspheres improved their photocatalytic activity more effectively.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 2
·2061-2074
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IF 2.478
Wang Xule,Song Jimei,Lu Yun,Zhu Wanrong,Hu Gang
In this work, a series of Z-scheme Ag/Ag 2 WO 4 /g-C 3 N 4 (AAC) photocatalysts were successfully constructed by the deposition–precipitation method at room temperature. The phase, structure, morphology and optical property of the as-prepared photocatalysts were well characterized. Interestingly, all AAC exhibited prominent photocatalytic activity for Rhodamine B (RhB) degradation under visible light illumination. Especially, AAC-3 possessed the higher RhB degradation rate ( k = 0.1855 min −1 ). More remarkably, when H 2 O 2 (1 mL 0.0977 mol/L) was dissolved into reaction system, the degradation rate of RhB was further improved ( k = 0.7899 min −1 ), which could be mainly attributed to the high separation rate of photogenic carriers and more active species. Meanwhile, a feasible photocatalytic reaction mechanism was proposed and discussed in detail.
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Micro & Nano Letters
·
2020
·Vol. 15
·期 15
·1126-1129
·
IF 0.975
Jun Wang,Aifeng Ning
Various sizes and morphologies of noble metal/zinc oxide hybrid materials have promising applications in surface-enhanced Raman scattering (SERS). Generally, organic agents used during the synthesis of metal nanoparticles will inexorably induce organic pollution on the surface of SERS substrate, resulting in a negative effect on detection sensitivity. Herein, a stable and clean 3D flower-like ZnO/Ag hierarchical microstructure SERS substrate was designed and fabricated via a simple photocatalytic method. This synthetic strategy does not involve usage of any organic agents, which ensures the cleanness and free of impurities interferences. As anticipated, the as-fabricated 3D flower-like ZnO/Ag SERS substrates with high surface-to-volume ratio increased numerous hot spots, and exhibited excellent detection sensitivity to Rhodamine 6G. A linear relationship between the Raman intensity and the concentration of Rhodamine 6G ranging from 10 −11 to 10 −4 M was realised. This work demonstrated a performance-enhanced SERS sensor based on microflower-like ZnO@Ag hybrids, which provides a potential method to develop highly sensitive and stable SERS sensor for organic molecules detection.
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