RSC Advances
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2016
·Vol. 6
·期 73
·69370-69380
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IF 3.289
Juncai Zhang,Youning Chen
With chloromethylated polystyrene resin being the base material, a new type of salicylic acid-type chelating resin with high capacity was prepared by grafting glycidyl methacrylate (GMA) on the surface of the resin via surface-initiated atom transfer radical polymerization and followed by the derivatization with 5-aminosalicylic acid. Fourier-transform infrared spectrometry and X-ray photoelectron spectroscopy were used to characterize the surface composition of the resin. It was found that the grafting degree of GMA increased linearly with the extension of ATRP time and GMA concentration. The maximum adsorption capacities of the resin were up to 4.23 mmol g−1 for Fe(III), 4.02 mmol g−1 for Ag(I), 2.36 mmol g−1 for Ni(II) and 1.75 mmol g−1 for Cu(II) at pH 4.0, respectively. The adsorption kinetics of the four metal ions conform to the model of pseudo second-order kinetics, and adsorption equilibria were better characterized by the Langmuir equation. Thermodynamic parameters were calculated to understand the nature of the adsorption process. The resin possesses excellent desorption rate and reusability. All these results indicate that the resin could be potentially applied to the efficient removal of heavy metal ions from waste water.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Zhigang Liu,Yi Wang,Rong Deng,Liyuan Yang,Shihua Yu,Shuping Xu,Weiqing Xu
A multifunctional magnetic graphene surface-enhanced Raman scattering (SERS) substrate was fabricated successfully by the layer-by-layer assembly of silver and graphene oxide (GO) nanoparticles (NPs) on the magnetic ferroferric oxide particles (Fe3O4@GO@Ag). This ternary particle possesses magnetic properties, SERS activity, and adsorption ability simultaneously. Owing to the multifunction of this Fe3O4@GO@Ag ternary complex, we put forward a new method called a surface magnetic solid-phase extraction (SMSPE) technique, for the SERS detections of pesticide residues on the fruit peels. SMSPE integrates many sample pretreatment procedures, such as surface extraction, separation sample, and detection, all-in-one. So this method shows great superiority in simplicity, rapidity, and high efficiency above other standard methods. The whole detection process can be finished within 20 min including the sample pretreatment and SERS detection. Owing to the high density of Ag NPs, the detection sensitivity is high enough that the lowest detectable concentrations are 0.48 and 40 ng/cm2 for thiram and thiabendazole, which are much lower than the maximal residue limits in fruit prescribed by the U.S. Environmental Protection Agency. This multifunctional ternary particle and its corresponding analytical method have been proven to be applicable for practical samples and also valuable for other surface analysis.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Xiang Dong,Guo-wei Dai,Le Xie,De-long Li,Zhiyu Sun,Song Liu
Fire alarm systems are essential for protecting lives and properties from fire hazards. However, most of the existing fire alarm nanopapers rely on the resistance reduction after heating, which requires direct contact with the flame. In this study, we present a novel fire alarm nanopaper (CMPA) based on heat-triggered shape recovery. The CMPA is composed of hydroxypropyl methyl cellulose (HPMC) as the matrix and 2D nanomaterials M(OH)(OCH 3 ) as fillers. When the temperature of CMPA exceeded the glass transition, the thrice-folded CMPA-1.0 flattened in 30s and connected to the alarm circuit based on its conductive surface. According to the results, the CMPA-1.0 with a thickness of about 0.2 mm had an efficient electromagnetic shielding of 42.1 dB. Moreover, the CMPA-1.0 self-extinguished rapidly after being ignited with its original shape preserved. The peak heat release rate of CMPA-1.0 was 108.9 W/g, which was 61.9 % lower than that of HPMC. Furthermore, the thermal conductivity of CMPA-1.0 reached to 0.317 W m −1 K −1 , which was 40.8 % higher than that of HPMC, reducing the heat accumulation effectively. This work shows that CMPA is an ideal material for sensitive and safe early fire alarm, and the strategy based on heat-triggered shape recovery is promising in fire alarm application.
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Tungsten
·
2024
·
IF 5.6
Lan Qing,Jin Su-Juan,Liu Ying,Jin Xiao-Li,Xie Hai-Quan,Li Yu-Zhu,Liu Ke-Cheng,Chen Li
With environmental issues gaining increasing attention, the demand for developing economical and reusable catalysts has become increasingly critical. Although precious metal catalysts are effective in photocatalytic pollutant decomposition and Cr(VI) reduction, their high price, instability, and recovery difficulty constrain their application. This study introduces an approach where Ag + ions are exchanged with cations in polyoxometalate (POM) via a mild grinding method, followed by in situ illumination under ultraviolet light to produce Ag/Ag-POM composite nanomaterials. Upon interaction with POM clusters, Ag + ions are reduced to Ag nanoparticles, which enhances visible light absorption in the composite, thereby improving its photocatalytic efficiency. Ag/Ag-POM nanomaterials obtained from this process exhibit efficient and stable catalytic performance, efficiently degrading tetracycline (TC) and reducing hexavalent chromium (Cr(VI)) under visible light (λ > 420 nm). Especially, the Ag/AgHPMo 11 V composite demonstrated superior catalytic performance, achieving degradation efficiencies of 99.9% for 40 mg·L −1 TC. Moreover, it also exhibited efficient photoreduction of Cr(VI), achieving a reduction rate of 62.81% for 80 mg·L −1 Cr(VI) in a 100 mL solution using just 10 mg of the catalyst within 40 min of visible-light exposure. This research highlights the potential of polyoxometalate-based catalysts in the photocatalytic treatment of pollutants.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·441-449
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IF 3.431
Li Yuanyuan,Zhu Nan,Ma Yulong,Li Qiang,Li Peng
Material with a core–shell structure based on a porous silica core and Ag nanoparticles (AgNPs) as shell (SiO 2 @Ag) was prepared with the seed growth method. Cellulose derivatives as chiral selectors were coated on the surfaces of SiO 2 @Ag particles by means of coating and intermolecular polycondensation as chiral stationary phases (CSPs), respectively. Fifteen racemates were used to evaluate their chiral recognition ability by high-performance liquid chromatography (HPLC). The results implied that the CSPs based on SiO 2 @Ag particles obtained stronger interaction with the analytes leading to better enantioseparation due to the existence of AgNPs on the surfaces of silica gel, compared with a cellulose derivative-modified silica column. In addition, the new CSPs showed special selectivity for ketone enantiomers, and AgNPs played a synergistic effect with cellulose derivatives on enantioseparation.
Schematic of SiO 2 @Ag stationary phase
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ACS Omega
·
2018
·
IF 0
Kaisong Yuan,Junxia Zheng,Danting Yang,Beatriz Jurado Sánchez,Xiangjiang Liu,Xinjie Guo,Chusheng Liu,Nicoleta Elena Dina,Jingyi Jian,Zhijun Bao,Ziwei Hu,Zhihong Liang,Haibo Zhou,Zhengjin Jiang
Herein, we developed a natural surface-enhanced Raman scattering (SERS) substrate based on size-tunable Au@Ag nanoparticle-coated mussel shell to form large-scale three-dimensional (3D) supercrystals (up to 10 cm2) that exhibit surface-laminated structures and crossed nanoplates and nanochannels. The high content of CaCO3 in the mussel shell results in superior hydrophobicity for analyte enrichment, and the crossed nanoplates and nanochannels provided rich SERS hot spots, which together lead to high sensitivity. Finite-difference time-domain simulations showed that nanoparticles in the channels exhibit apparently a higher electromagnetic field enhancement than nanoparticles on the platelets. Thus, under optimized conditions (using Au@AgNPs with 5 nm shell thickness), highly sensitive SERS detection with a detection limit as low as 10–9 M for rhodamine 6G was obtained. Moreover, the maximum electromagnetic field enhancement of different types of 3D supercrystals shows no apparent difference, and Au@AgNPs were uniformly distributed such that reproducible SERS measurements with a 6.5% variation (613 cm–1 peak) over 20 spectra were achieved. More importantly, the as-prepared SERS substrates can be utilized for the fast discrimination of Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa by discriminant analysis. This novel Au@Ag self-assembled mussel shell template holds considerable promise as low-cost, durable, sensitive, and reproducible substrates for future SERS-based biosensors.
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CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Shi-Wei Fu,Jian Yang,Zong-Yan Zhao,Bao-Feng Shan,Jia-Xin Zhang,Jin Zhang,Qingju Liu,Jianyong Feng,Zhaosheng Li,Zhigang Zou
A profound understanding of the band-edge electronic structure is crucial for advancing the development of highly efficient photocatalytic materials and unraveling the underlying mechanisms. This study employs a unified and consistent assessment protocol, offering a systematic exploration of the inherent connections between the band-edge electronic structure and the photo(electro)catalytic performance of a series of delafossite ABO2 compounds (A = Cu, Ag; B = Al, Ga, In). These compounds exhibit characteristics of indirect bandgap semiconductors, with fundamental and optical bandgaps spanning from 1.45 to 3.57 eV. Notably, the Cu-based ABO2 compounds display a significantly larger fundamental bandgap and excel as photocathode materials when the B-site element is held constant. Among these, CuInO2 emerges as the most promising candidate, showcasing superior photo(electro)catalytic performance. Extensive density functional theory calculations unravel intricate insights into the interplay between the band-edge electronic structure and valence orbital hybridization of the A- and B-site elements, providing invaluable perspectives for comprehending and enhancing the photo(electro)catalytic performance of such compounds. The findings in this study not only establish robust theoretical foundations for integrating ABO2 compounds into the field of photo(electro)catalysis but also lay the groundwork for future material design and optimization.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Busaremu Wulayimujiang,Fang Guo,Qianyu Ma,Yong Wen,Yang Yang,Hongyan Huang,Quanpei Xie,Meng Shen,Jinxin Liu,Si Cheng
Even though membrane separation materials have worked very well for purifying dyestuff wastewater, the short residence time and high pollutant flow rates in the membrane, which can lead to incomplete or insufficient photodegradation, make it currently difficult to separate and photodegrade large-scale or highly concentrated dyestuff wastewater in one step. Herein, we propose an ‘all-in-one’ 3D nanofibrous aerogel architecture (aPAN/MXene@Ag–Ag2S), which can achieve efficient purification of high-concentration dyeing effluents under natural sunlight via two methods: filtration or solar interfacial evaporation. Ag–Ag2S nanoparticles with two different structures are reduced on Ti3C2Tx nanosheets through a UV light-induced in situ reaction, and they function as effective photocatalysts with excellent photothermal ability for solar interfacial evaporation. The special combination of Ag–Ag2S, MXene, and aPAN nanofibers in the aPAN/MXene@Ag–Ag2S aerogels achieved 95% separation and 99.99% photocatalytic degradation efficiencies for oil/water emulsions with methylene blue at a high concentration of 1000 mg L−1, which far exceeds those of recently reported MXene-based catalysts. In particular, wastewater from industrial dyeing could be treated to clean water under natural sunlight. In addition, the evaporation rates of the aPAN/MXene@Ag–Ag2S aerogel for seawater and textile dye wastewater respectively reach 2.69 kg m−2 h−1 and 2.44 kg m−2 h−1 and almost 100% degradation efficiency is achieved. Both the filtered fresh water and the evaporated water produced by solar evaporation meet the requirements of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant or the World Health Organization (WHO) and the US Environmental Protection Agency (EPA) standards for drinking water, respectively.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Tongwei Zhang,Huijie Qin,Lihong Bao,Mingkao Xu,Bo Dang,Jianxi Li
Two-dimensional molybdenum disulfide (MoS 2 ) nanosheets are seen as highly promising nanofillers for enhancing polymer properties, yet there is a need for methods that are low-cost, simple, and environmentally friendly to facilitate the large-scale production of MoS 2 nanosheets. Furthermore, it is necessary to functionalize the MoS 2 surface to ensure good interfacial compatibility with the polymer matrix. In this study, MoS 2 @Ag@PA hybrids were created by generating silver nanoparticles directly on the surface of MoS 2 via radiation, followed by encapsulation on the surface of MoS 2 @Ag through the chelating properties of phytic acid. It is significant to note that, due to the excellent lubrication and physical cross-linking effects of the MoS 2 @Ag@PA hybrids, adding one part of MoS 2 @Ag@PA hybrids can enhance the melt flow rate and elongation at break of the ethylene vinyl acetate copolymer (EVA)/MH composites by 140% and 17.3%, respectively. The simultaneous addition of one part of MoS 2 @Ag@PA hybrids decreased the peak heat release rate, total heat release, and total smoke release of the EVA composites by 48.7%, 42.7%, and 41.2%, respectively. Moreover, the toxic gasses (e.g., CO) generated by burning EVA composites were significantly reduced compared to pure EVA, indicating improved fire safety. This research not only provides significant opportunities for the green mass production of MoS 2 nanosheets but also expands their potential applications in high-performance nanocomposites.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-13
·
IF 5.3
Chen Tao,Ge Yu,Lu Xinyu,Hu Jiaqi,Karimi-Maleh Hassan,Wen Yangping,Wang Xiaoqiang,Huang Zhong,Li Mingfang
The stability of black phosphorene (BP) and its preparation and modification for developing and applying devices have become a hot topic in the interdisciplinary field. We propose ultrasound-electrochemistry co-assisted liquid-phase exfoliation as an eco-friendly one-step method to prepare gold–silver bimetallic nanoparticles (Au−AgNPs)-decorated BP nanozyme for smartphone-based portable sensing of 4-nitrophenol (4-NP) in different water sources. The structure, morphology, composition, and properties of Au−AgNPs−BP nanozyme are characterized by multiple instrumental analyses. Bimetallic salts are induced to efficiently occupy oxidative sites of BP to form highly stable Au−AgNPs−BP nanozyme and guarantee the integrity of the lamellar BP. The electrochemistry shortens the exfoliation time of the BP nanosheet and contributes to the loading efficiency of bimetallic nanoparticles on the BP nanosheet. Au−AgNPs−BP-modified screen-printed carbon electrode coupled with palm-sized smartphone-controlled wireless electrochemical analyzer as a portable wireless intelligent sensing platform was applied to the determination of 4-NP in a linear range of 0.6−10 μM with a limit of detection of 63 nM. It enables on-site determination of 4-NP content in lake water, river water, and irrigation ditch water. This work will provide a reference for an eco-friendly one-step preparation of bimetallic nanoparticle-decorated graphene-like materials as nanozymes and their smartphone-based portable sensing application outdoors. Graphical abstract
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Wei Tian,Yaqin Rong,Dali Li,Jin Tian,Naiming Lin,Zhongde Wang
The contamination of water by heavy metal ions can easily cause serious environmental problems and damage to the human body hands down. Using zeolitic imidazolate framework-67 (ZIF-67) as a sacrificial template, polyhedral CoS hollow nanocages (HNC) were successfully synthesized by self-template approach as adsorbents for heavy metal ions removal. The CoS HNCs suggested good chemical stability and extremely efficient heavy metal ions removal of Ag + , Cd 2+ , Cu 2+ , Pb 2+ and Zn 2+ , which can be ranked in the order of Ni 2+ ≪ Zn 2+ , Cd 2+ < Pb 2+ , Cu 2+ , Ag + . The saturation adsorption for Ag + reached 2147.944 mg g −1 and exhibited high distribution coefficients (K d ) > 107 mL g −1 . The CoS HNCs can rapidly reduce the Ag + concentration from ppm level to trace level of 1 ppb. It has been proved that the rapid and selective adsorption was achieved via the hierarchical pore structure of the CoS HNCs can better disperse these metal vacancies with super affinity and the S 2− , reduce the mass transfer distance and accelerate mass transfer. It is expected that such a CoS HNCs could be a promising alternative to conventional materials for the adsorption of heavy metal ions.
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ULTRASONICS SONOCHEMISTRY
·
2019
·
IF 7.279
L.L. Dong,Y.C. Ding,W.T. Huo,W. Zhang,J.W. Lu,L.H. Jin,Y.Q. Zhao,G.H. Wu,Y.S. Zhang
Recently, graphene decorated with various inorganic nanoparticles, such as Pt, Au, Ag, TiO 2 and Fe 3 O 4 , among which Ag nanocomposites are good candidates for electronics, optics, electrochemistry and catalysis. However, preparation techniques for Ag nanoparticles/carbon matrix hybrids require tedious multi-step processes often involving toxic reducing agents/high temperatures which is not viable for scalable production. Here, a facile, one step and eco-friendly chemical co-reduction route was utilized to synthesis of a new nanocomposites by Ag nanoparticle anchored on reduced graphene oxide (rGO) at ambient temperature and combined first principles theoretical analyze their interfacial adsorption behavior, is reported. In this way, graphene oxide (GO) and Ag + simultaneously reduced by thiourea dioxide (TD) without using any additional reduced reactants. Results indicated that GO was successfully reduced to rGO and well-dispersed Ag nanoparticles with sizes of 6–7 nm, anchored on the surface of rGO sheets. Reduction mechanism was attributed to the synergistic effect of its hydrolysis products in aqueous media. The experiment and theoretical calculation results obtained demonstrate this method to be applicable to the synthesis of other metals on rGO sheets in order to improve wettability and interfacial bonding between rGO and metal and may possibly find various forthcoming medicinal, industrial and technological applications.
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