CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Kun Wang,Xun Zhu,Rong Chen,Dingding Ye,Yang Yang,Qiang Liao
In this work, Ag nanoparticles as surface plasmon catalysts were prepared on polydopamine microspheres via in-situ reduction for catalytic 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. The kinetics of catalytic reaction under light and dark conditions was compared. It was found that the reaction rate constant under light condition was increased by 53.6% due to the surface plasmon resonance effect. The transition state theory was used to reveal the enhanced mechanism of catalytic conversion of 4-nitrophenol under light condition. It is demonstrated that the light-excited high-energy electrons are responsible for the shift of the adsorbed reactants to the excited state with higher potential energy, lowering the apparent activation energy from 47.2 kJ/mol to 32.6 kJ/mol and thereby enhancing the conversion of 4-nitrophenol to 4-aminophenol. This study offers a deep insight into the contribution of surface plasmon resonance to catalytic conversion of 4-nitrophenol by surface plasmon catalysts.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Ruiqi Li,Changqing Zhou,Lixue Yang,Junqing Li,Guoli Zhang,Jiaxiang Tian,Wencong Wu
Water evaporation using photothermal materials is a cost-effective and sustainable technology for alleviating the world’s freshwater crisis, but oil contaminants and organic pollutants exist in the original water sources, which severely degrade the evaporation performance and pose environmental hazards. In this paper, we demonstrate a photothermal material (multifunctional cotton) that simultaneously demonstrates oil-resistance, organic pollutant removal, and a high water evaporation rate. A Schottky heterostructure was formed between polyaniline (PANI) and Ag NPs, which improved the photothermal conversion and achieved a water evaporation rate of 1.37 kg m −2 h −1 and photothermal conversion efficiency of 84.7% under one-sun illumination (1 kW m −2 ). Notably, various organic pollutants in the water source were thoroughly removed by visible-light catalytic degradation and adsorption, which displayed efficiencies of 99.3% and 97%, respectively. The multifunctional cotton also possessed excellent superoleophobicity, and repelled oil contaminants and organic pollutants in water. Considering these merits, the as-prepared multifunctional cotton is an outstanding candidate for water evaporation from various sources.
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PubMed
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Sanjun Yang,Qiming Liu
An aligned Ag nanowire array was directly synthesized by galvanic replacement on curved poly(ethylene terephthalate) (PET) by using a Cu2O microcrystal as a reductant. A more orderly aligned nanowire array was obtained when the curvature radius was reduced. A second growth with different orientation produced Ag nanowire networks. The guided growth was also achieved when using Zn as a reductant or polystyrene as a substrate. This plain method with facile control over the orientation and density of the Ag nanowire array enriches the grow-in-place methodology and can potentially be applied to various fields.
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PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 48
·41696-41706
·
IF 3.289
Guangyan Tian,Wenbo Wang,Li Zong,Yuru Kang,Aiqin Wang
Palygorskite (PAL) has been widely used for adsorption removal of dyes from wastewater, but the dye-loaded PAL is usually discharged as solid waste because it is hardly regeneratable by conventional elution processes. As the aim was to efficiently utilize the dye-loaded PAL waste, we employed a facile one-pot hydrothermal process to transform the spent methyl violet (MV)-loaded PAL into multifunctional ternary palygorskite/carbon/Ag nanoparticles (PAL/C/AgNPs) nanocomposites in the assistance of AgNO3. The MV-loaded PAL serves as a carbon precursor, reducer of Ag(I) and supporter of the in situ formed AgNPs. Structure characterizations confirmed that the MV dye was transformed into carbon species, and AgNPs were formed on the PAL with good dispersion, and the addition of Ag(I) ions promoted carbonization of the MV molecules. The as-prepared nanocomposites exhibited excellent adsorption and catalytic performance. Adsorption evaluation showed that the nanocomposite prepared at 5 mass% of AgNO3 dosage gives the best adsorption properties, and 99.2% of methylene blue (MB), 86.9% of MV, 68.7% of chlortetracycline hydrochloride (CTC) and 46.2% of tetracyclines (TC) were rapidly removed from 100 mg L−1 of the aqueous solution using 0.5 g L−1 of the adsorbent. The removal ratio increased with increasing dosage of adsorbent, and the minimum usage amounts of adsorbent for the thorough removal of MB, MV, CTC and TC molecules were 1.0 g L−1, 1.2 g L−1, 3.5 g L−1 and 4.5 g L−1, respectively. Moreover, the nanocomposites could rapidly catalyze the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 6.5 min with a catalytic rate constant of 0.0120 s−1, and the catalytic activity is still retained after 8 cycles of reuse. In addition, the nanocomposite can be re-generated into new adsorbents by the same hydrothermal process after adsorption of organic matters, which open a new sustainable avenue to efficiently utilize waste dye-loaded PAL and develop new adsorption and catalysis materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 30
·46200-46213
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IF 5.19
Wang Yaqiao,Xia Xunfeng,Gao Shengwang,Zhao Xingpeng,Wang Guoying,Han Xue
A novel Ag/BiOBr/CeO 2 composite was successfully prepared for the first time, which had excellent performance in degrading sulfisoxazole (SSX) under visible light irradiation. The as-prepared samples were characterized by SEM, XRD, UV–vis DRS and BET et al. The composite of 10% Ag/BiOBr/CeO 2 showed the best photocatalytic activity and more than 99.5% SSX can be removed within 20 min. It exhibited the highest k value of 0.2428 min −1 , which was about 39.7 times higher than pure BiOBr (6.11 × 10 −3 min −1 ) and 22.1 times higher than BiOBr/CeO 2 (1.09 × 10 −2 min −1 ), respectively. The addition of Ag significantly improved the absorption rate of visible light and the separation rate of photogenerated electron–hole pairs. The initial pH and dosage of samples could have an influence on the photocatalytic activity. The radical trapping experiments proved that · O 2 − and h + were the main active species involved in photocatalytic degradation. Finally, the synthesized catalyst maintained excellent photocatalytic activity after 5 repeated cycles, which indicated the extraordinary stability and recyclability of Ag/BiOBr/CeO 2 . Graphical abstract
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Yulin Ma,Mingming Liu,Yange Feng,Hongyu Zheng,Yongling Wu
Piezoelectric polyvinylidene fluoride (PVDF) based piezoelectric materials are good candidates for energy harvesting devices and sensing systems. Improving the piezoelectric sensitivity of the electro-spun PVDF fibers is still challenging and highly desirable. In this work, ZnO@Ag nanoparticles were synthesized and utilized as surface modifier to generate a hierarchical structure on the fiber surfaces to construct a flexible and piezoelectric three-phase coupling sensor. The effects of the atomic ratio of Ag:ZnO, surface morphology and particle concentration of ZnO@Ag nanoparticles on the β-phase content, piezoelectricity, wettability and mechanical stability of the sensor device were systematically investigated. The elastic modulus of ZnO@Ag/PVDF membrane is 0.01322 GPa, which is close to that of human skin 0.0188 GPa. Due to synergistic effect of the enhanced electrostatic field polarization and surface hierarchical structure, the ZnO@Ag/PVDF piezoelectricity sensor possessed voltage and current outputs of 15.0 V pp and 1.775 μA respectively, which were 3.5 and 5.4 times higher than pure PVDF-based sensor. The sensitivity of the ZnO@Ag/PVDF nanofiber-based sensor was 2.422 V/kPa, which was 14.4 times higher than that of pure PVDF-based sensor. The sensor has a fast response/recovery time of 30/45 ms. The sensor can accurately detect various physiological strain signals such as cantilever oscillatory excitation, finger press, or walking behavior, and can light-up several light-emitting diodes (LEDs) and charge a capacitor (20 μF) in a short period (2.41 V in 5 Sec). This fiber-based energy harvesting and pressure sensor demonstrates promising applications in self-powered flexible wearable electronic devices in healthcare and home-care fields.
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APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Menghan Yu,Haiyan Wu,Yuhang Meng,Menghan Qu,Huaming Yang
Given the global proliferation of pathogenic microorganisms , there exists a pressing imperative to cultivate efficacious nanomaterials possessing antimicrobial attributes, thereby impeding the transmission of infectious diseases. Clay-based nanoparticles , due to their inherent properties, serve as optimal candidates for the creation of innovative antimicrobial agents, particularly for coating materials . In this study, ZnO nanoparticles were synthesized on talc surfaces and doped with Ag + , yielding an effective antimicrobial composite (Ag-ZnO/talc). The primary aim was to comprehensively evaluate the antimicrobial effectiveness, material compatibility, and biosafety of Ag-ZnO/talc, as well as its potential applications in antibacterial coatings . The finding underscored the remarkable antibacterial properties of Ag-ZnO/talc composites, chiefly through the generation of reactive oxygen species , leading to impairment of the bacterial membrane and leakage of nucleic acid content. A biosafety evaluation indicated minimal cytotoxicity, a low hemolysis rate, and negligible skin tissue reactions, thereby suggesting its suitability for human application. Furthermore, the incorporation of the antimicrobial agent Ag-ZnO/talc did not significantly alter the physicochemical characteristics of the coating, while maintaining an enduring antimicrobial effect for a duration of two months. These findings establish the potential of clay-based antimicrobials for effective and safe application in coatings, facilitating the development of antimicrobial coatings in diverse industrial and public health environments.
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高影响因子
Journal of CO2 Utilization
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2021
·
IF 7.132
Danqing Shu,Miao Wang,Fengyu Tian,Honglei Zhang,Chuang Peng
Electroreduction of CO 2 to high value-added products such as hydrocarbons provides a promising way to create a carbon neutral circular economy. Copper (Cu) is the most effective metal catalyst with selectivity towards hydrocarbons but Cu catalyst alone generally produces hydrocarbons at low selectivity and yield. Operando surface enhanced infrared absorption spectroscopic (SEIRAS) analysis reveals that the low hydrocarbon yield is attributed to the poor ability of Cu to produce carbon monoxide (CO), which is a crucial intermediate for hydrocarbon formation. In the current study, an Ag-Cu dual-cathode CO 2 RR device is developed, which allows separate control of electrode potential. This dual-cathode cell shows increased hydrocarbon yield (83 % for methane and 106 % for ethylene) and a 200 mV lower onset potential for C 2 H 4 , compared to electrolysis with a single Cu cathode. The CO produced by the Ag cathode transfers to Cu and increase its CO coverage, facilitating methane formation as well as promoting C C coupling to form ethylene. This study also reveals a mismatch of optimum electrode potential between Ag and Cu, which results in compromised performance of the two components in an Ag-Cu bimetallic electrocatalyst, but poses no challenge in the dual-cathode cell. To optimize the performance of the dual-cathode cell, we propose the use of a single-pass dual-gas-diffusion-cathode reactor with enhanced mass transfer for maximum hydrocarbon production. This work verifies that splitting the complex CO 2 RR process into two separate steps is a feasible method to improve the overall efficiency and rate of advanced products while reducing the energy input.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xiaoni Du,Xiaohong Wang
A new and efficient series of photocatalysts , Bi 5 O 7 NO 3 and Ag/Bi 5 O 7 NO 3 composites, were successfully prepared by a one-pot solution combustion synthesis (SCS) method. Bi(NO 3 ) 3 , C 4 H 6 O 6 , and AgNO 3 were used as the oxidant, fuel, and Ag source, respectively. The crystals structure of the orthorhombic Bi 5 O 7 NO 3 and cubic Ag was characterized by employing XRD and EPMA techniques. Both Bi 5 O 7 NO 3 and Ag/Bi 5 O 7 NO 3 composites showed good photocatalytic degradation efficiencies for methyl orange (MO) under visible-light irradiation. The PL analysis results showed metallic Ag played a vital role in improving the separation of photo-induced electrons and holes, leading to the enhancement of photocatalytic activity. The Ag-5% composite showed the highest photocatalytic degradation efficiency (95% at 60 min), which is 1.5 times more than that of pure Bi 5 O 7 NO 3 .
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ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Jiahe Huang,Hongyan Zhang,Xiaofeng Zhao,Ju Bai,Yanjun Hou,Shuhong Wang,Cheng Wang,Dongge Ma
Organic electric memory devices have broad application prospects. In the present paper, a new kind of polyfluorene-based material containing methoxytriphenylamine groups was synthesized, which exhibited good Flash-type storage characteristics. The material was further doped with Ag NPs to improve storage performance. With appropriate amount of Ag NPs, the device presented an ON/OFF current ratio up to 1.1 × 10 4 with excellent stability. In addition, the switching characteristics of the device were discussed through data fitting and molecular orbital calculation.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 15
·8832-8844
·
IF 9.931
Yunlong Guo,Da-Peng Yang,Minghuan Liu,Xiaoyan Zhang,Yisong Chen,Jiale Huang,Qingbiao Li,Rafael Luque
Catalytic oxidation plays a key role in transforming gaseous benzene into harmless matter, in which it is essential to look for a low-cost, environmentally friendly and efficient green catalyst/support. Herein, Ag nanoparticle (Ag NP) loaded-eggshell catalysts were successfully synthesized by a simple impregnation method, in which waste eggshells were used as an efficient template and catalyst support. SEM, XRD and ICP-OES results show that a different number of Ag NPs are uniformly distributed on the surface of eggshells, which are defined as Ag1/eggshell (10.8%), Ag2/eggshell (19.9%) and Ag3/eggshell (34.3%) catalysts according to the amounts of loaded Ag NPs. Then, the activity between the three catalysts and the pure Ag NPs was assessed based on the catalytic oxidation of benzene. Our results show that the Ag NP loaded-eggshell catalysts exhibit superior catalytic activity compared with the pure Ag NPs. Considering the balance between the cost and catalytic performance, the Ag2/eggshell catalyst was selected as the optimum research object in the subsequent work. The Ag2/eggshell catalyst calcined at 500 °C exhibited excellent catalytic activity, which is assigned to the unique channel structure of eggshell, good low-temperature reducibility, and high dispersion of particles (sizes effects) on the surface of eggshell as well as the synergetic interaction between the Ag NPs and eggshell. Furthermore, the Ag2/eggshell catalyst exhibited predominant stability even after 200 h of on-stream reaction. The reaction mechanism is put forward based on the in situ FTIR experimental results, in which some carboxylate intermediate species are confirmed. Accordingly, the waste eggshell is considered as a promising supporting material for the large-scale synthesis of noble metal catalyst with high catalytic performance and stability for VOC oxidation.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-10
·
IF 6.408
Xia Dacheng,Jiang Panpan,Cai Zhiwei,Zhou Rui,Tu Bo,Gao Nan,Chang Gang,He Hanping,He Yunbin
A new approach is presented to fabricate flexible surface-enhanced Raman scattering (SERS) substrate of Ag nanocubes monolayer-modified polydimethylsiloxane (Ag NCs/PDMS) through a powerful three-phase interface self-assemble method. The morphologies and crystal structures were characterized by scanning electron microscopy and X-ray diffraction. The self-assembled Ag NCs/PDMS substrate exhibited high SERS activity and good signal homogeneity, which was successfully used for quantitative detection of thiram; the detection limit reached 10 ng/mL, and the linear range is 10–1000 ng/mL. Furthermore, the flexible SERS substrates were successfully employed to detect thiram residues on factual apple samples, and trace amount (1 ng/cm 2 ) of thiram residues was detected on apple peels. The excellent SERS detection ability of self-assembled Ag NCs/PDMS substrate indicated that it will play an important role in pesticide detection in the future. Graphical abstract
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危险品化学品经营许可证（带存储）