Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Yaqi Hou,Shengyan Pu,Qingqing Shi,Sandip Mandal,Hui Ma,Shengyang Xue,Guojun Cai,Yingchen Bai
New approaches and practices to improve photocatalytic efficiency of materials for remediation of organic and inorganic pollutant has become a top priority. We have developed a graphene-oxide based ternary composite Ag/TiO 2 /rGO as a green catalyst, and the photocatalytic oxidation and reduction efficiency of the catalyst was thoroughly evaluated for Cr(VI) and tetracycline (TC) remediation in water as potential contaminants. The results suggested that the electronic coupleing system exhibits excellent photocatalytic activity, mainly due to affecting light absorption and higher e − / h + separation efficiency. The photocatalytic activity of the silver-deposited graphene-supported silver and titanium dioxide was 4.3 and 2.5 times for Cr (VI) and TC remediation, respectively. Furthermore, the service life of the photocatalyst was also evaluated within five recycling studies, indicating that the efficiency of the obtained photocatalyst was maintained above 80%. Electron paramagnetic resonance spectroscopy and the addition of free radical scavengers confirmed that e − act as reducing agents and may be the key (O 2 ·− ) to the degradation process. The photocatalytic mechanism was proposed based on the studies obtained. Green catalysts based on graphene-based ternary composites developed in this work can provide effective and economic remediation at higher scale and offer practical application of photo catalysis technology.
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Environmental Science-Nano
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2019
·Vol. 6
·期 11
·3431-3441
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IF 7.704
Bowen Xiao,Yinqing Zhang,Xiaolei Wang,Meng Chen,Binbin Sun,Tong Zhang,Lingyan Zhu
The wide production and utilization of nanoparticulate Ag and Ti inevitably result in their release into the environment. Thus far, limited information is available regarding to what extent the nanoparticulate Ag and Ti could accumulate in biota and magnify along the food chain in real natural aquatic environments. With the application of single particle inductively coupled plasma mass spectroscopy, we quantitatively demonstrated that both nanoparticulate Ag (18.8–41.0 nm) and Ti (46.6–116 nm) occurred in the water, sediment and aquatic organisms in Taihu Lake, China. Nanoparticulate Ag exhibited greater bioaccumulation potential compared to its other chemical counterparts, and also a greater bioaccumulation factor than nanoparticulate Ti. Sediment served as a main reservoir for nanoparticulate Ag and Ti, and acted as one important exposure source for invertebrates. According to the concentrations of nanoparticulate Ag and Ti in aquatic organisms at different trophic levels, including a variety of invertebrates and fish species, the total and nanoparticulate Ti appeared to be biodiluted in the food web with trophic magnification factors (TMFs) < 1. Conversely, biomagnification of nanoparticulate Ag was found in the fish food web with a TMF of 1.21, while the total Ag was biodiluted. These findings serve as the first line of evidence on the transfer behaviors of nanoparticulate Ag and Ti along the natural aquatic food chain and underline the distinctive bioaccumulation and biomagnification behaviors of nanoparticles as opposed to their other chemical counterparts.
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ELECTROCHIMICA ACTA
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2019
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IF 5.383
Xiaorong Zhang,Muhammad Shakeel,Baoshan Li,Lei Wang
Advanced photo-/electrocatalyst is devoted for O 2 and H 2 evolution reactions (OER and HER) with immense quantum conversions efficiency. Herein, a novel foamed zinc oxide-silica spheres and Ag–AgBr nanocomposite (Ag–AgBr/FZSS) was engineered and passes through a complete characterization profiling. The Ag–AgBr/FZSS possesses the distinctive porous surface with open cavities. The hierarchical morphology provides many active sites and mesoporous conducting channels for visible light absorption and charge carriers transportation. The Ag–AgBr/FZSS act as outperformed photo-/electrocatalyst for OER (overpotential 348 mV @ 10 mAcm −2 ) and HER (potential −217 mV @ 100 mAcm −2 ). While under illumination conditions it reduced to 337 mV and −195 mV with high quantum conversion efficiency (37.5%). The lustrous durability further justified as a highly efficient photo-/electrocatalyst for renewable energy conversions.
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ANALYST
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2019
·Vol. 144
·期 7
·2416-2422
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IF 4.019
Hongwei Song,Zhibo Li,Yinxian Peng,Xin Li,Xuechao Xu,Jianming Pan,Xiangheng Niu
Given that alkaline phosphatase (ALP) is an important biomarker for many diseases, monitoring of its activity turns to be of great significance for related disease diagnosis and treatment. Herein, we report a new colorimetric assay based on the enzyme-triggered in situ formation of Ag nanoparticles (NPs) with high oxidase-mimicking activity for ALP activity detection. ALP first hydrolyzes the ascorbic acid phosphate (AAP) substrate to produce ascorbic acid (AA); the produced AA with strong reducing capacity then transforms Ag+ into Ag NPs; compared with the Ag+ precursor, the in situ formed Ag NPs have much higher oxidase-like activity to catalyze the 3,3′,5,5′-tetramethylbenzidine (TMB) color reaction mediated by dissolved O2 at neutral pH. On the basis of this principle, amplified colorimetric detection of ALP activity with a linear scope of 0.15–5 U L−1 and a limit of detection down to 0.037 U L−1 was realized. In addition, our assay exhibited specific response toward ALP against other biological enzymes and species. Accurate and reliable determination of ALP activity in human plasma was also demonstrated by our assay, suggesting its great potential as a facile and efficient tool for monitoring of ALP activity in clinical practice.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Xue Hu,Xidong Liu,Xiaodan Zhang,Haiyan Cao,Yuming Huang
By tuning the photoluminescence of alloy Cu/Ag nanoclusters (NCs) and thiamine (VB 1 ) simultaneously through MnO 2 nanowires, we report a simple and label-free ratiometric fluorescent platform for sensitively and selectively sensing of glutathione (GSH). Ag doping of Cu NCs significantly enhances the quantum yield (QY, about 2-fold enhancement), oxidation resistance to air, storage stability (60 days versus 1 day), photostability and salt stability of the resultant Cu/Ag NCs. Impressively, MnO 2 nanowires quench the fluorescence of Cu/Ag NCs, while they enhance the fluorescence of nonfluorescent VB 1 via oxidation reaction between VB 1 and dissolved oxygen to produce oxVB 1 as a nanozyme catalyst. Upon introduction of GSH as a target, the MnO 2 nanowires are reduced to Mn 2+ and lose their quenching capacity and oxidase-like activity, resulting in FL recovery of Cu/Ag NCs and fluorescent decrease of oxVB 1 . Hence, a ratiometric luminescence signal is obtained, providing a novel ratiometric fluorescent strategy for detecting GSH through target induced regulation of the catalytic activities and quenching ability of MnO 2 nanowires. The sensor exhibited a wide linear concentration range (10 nM to 70 μM) for GSH with a detection limit of 6.5 nM. The ratiometric sensor was successfully used for GSH detection in biological samples.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
·
IF 3.834
Bo Ge,Guina Ren,Xiao Miao,Xiuling Li,Tingxiao Zhang,Xipeng Pu,Chuanyu Jin,Limin Zhao,Wenzhi Li
Synthetic composites with exceptional wettability have been widely used for oil/water separation. However, a common limitation is that water soluble pollutants, such as dyes from textile mills and residual drugs from pharmaceutical factories, are not efficiently separated and remain in water phase. In this research, we fabricated a superhydrophobic BiOBr/Ag copper mesh composite. The design offers the following advantages. Firstly, it achieves high oil/water separation efficiency (99.5%), and it has the capability to remove water soluble pollutants under visible light (λ > 420 nm). Secondly, the material's design is holistic which simplifies the recovery process and maintains the degradation efficiency at 94% after 12 cycles of repeated use. The main active species under visible light and overall degradation mechanism were determined via trapping experiment of the active species and analysis of the valence and conduction band of the material, respectively. Finally, a sample with a size of 12 cm × 12 cm was prepared by amplifying the formula.
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Fuel Cells
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2019
·Vol. 19
·期 2
·169-176
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IF 2.33
T. Fu,S. Zhang,J. Huang,D. Cai,J. Li,J. Zhao
Ag-Pt alloy material is one of the most potential candidates to improve the catalytic activity of Pt-based catalyst toward the oxygen reduction reaction (ORR), which can reduce the dosage of the high-cost metal Pt used in the cathode of fuel cells. But it is hard to synthesis Ag-Pt alloy with nanosize in an easy and cheap way. In this study, the Ag-Pt alloy nanoparticles supported on carbon (Ag-Pt/C) with different Ag at.% were prepared by a facile one-pot approach with low costs. The XRD, TEM and XPS measurements were applied to verify the alloy structure of Ag-Pt nanoparticles. These Ag-Pt/C samples showed enhanced mass activities and catalytic stabilities for the ORR, which was up to two times higher than that of the commercial Pt/C catalyst at 0.9 V ( vs. reversible hydrogen electrode). Furthermore, the membrane electrode assembly (MEA) made from the Ag-Pt/C catalyst also showed a higher power density in H 2 -O 2 fuel cell test compared to the MEA made from the commercial Pt catalyst. These enhancements are attributed to the higher utilization of Pt and the regulated oxygen adsorption energy of Pt in the surface, which was confirmed using the density function theory calculation.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2019
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IF 6.019
Liangxin Zhu,Chong Chen,Yujuan Weng,Fumin Li,Qiang Lou
To improve the power conversion efficiency (PCE) and stability of inverted perovskite solar cells (PSCs) prepared in humid air (RH = 55%), a new zinc oxide (ZnO):TIPD composite film is inserted between PCBM layer and Ag electrode for the first time. Compared to the single PCBM layer, the formed PCBM/ZnO:TIPD electron transport layer (ETL) has better coverage on the perovskite layer and more effective charge extraction ability from the perovskite layer. The insertion of ZnO:TIPD film effectively suppress the charge recombination at perovskite/ETL interface. Besides, the PCBM/ZnO:TIPD layer has better ability to prevent moisture from penetrating into the perovskite layer than single PCBM film. For these reasons, the PCE and stability of the PSCs with the PCBM/ZnO:TIPD are significantly improved compared to the PSCs with single PCBM (or ZnO:TIPD) layer. The highest efficiency of the cell with PCBM/ZnO:TIPD ETL reaches (13.7 ± 0.4)% in ambient atmosphere, which is 1.20 times that of the PSCs with PCBM only.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Lu-Lu Qu,Zhi-Qin Geng,Wen Wang,Kai-Chun Yang,Wei-Peng Wang,Cai-Qin Han,Guo-Hai Yang,Robert Vajtai,Da-Wei Li,Pulickel M. Ajayan
A three-dimensional (3D) substrate was developed by assembling a monolayer of graphitic carbon nitride (O-g-C 3 N 4 ) on Ag nanorod arrays (Ag NRs) for sensitive and recyclable surface enhanced Raman scattering (SERS) detection. The prepared Ag NRs/O-g-C 3 N 4 substrate not only generated a significant Raman enhancement effect as a result of the strong π-π stacking interaction between O-g-C 3 N 4 and the analytes but also possessed excellent self-cleaning property via visible-light irradiation that was attributed to its outstanding catalytic performance. Highly sensitive SERS detection could be achieved with a LOD of 8.2 × 10 −10 M for R6 G, and the substrate could be used repeatedly for at least four cycles with tolerable intensity attenuation. In addition, the 3D substrate exhibited long-term stability originating from the electron-donor effect of O-g-C 3 N 4 and high reproducibility due to the uniform decoration of O-g-C 3 N 4 on the Ag NRs through the strong interaction. Furthermore, using Ag NRs/O-g-C 3 N 4 , the recyclable detection of antibiotics in a water sample was demonstrated with high sensitivity, which indicates that the 3D Ag NRs/O-g-C 3 N 4 substrate is a promising candidate for eliminating the challenges of single-use SERS substrates and building a portable SERS platform to sense organic molecular species.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 30
·8081-8089
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IF 3.286
Ma Yankai,Nie Bei
Correlated spectroscopic analysis can provide complementary chemical insights that are often unattainable by either approach used in isolation. We distinguished the different self-assembling behavior of isomeric aminothiophenols (ATPs) on Ag dendrite by the correlation of surface-enhanced Raman spectroscopy and laser-induced desorption ionization mass spectrometry, demonstrating that steric effect impinged significantly upon surface molecular density and plasmon-driven catalytic reaction yield, which led to drastic variations in the resulting SERS spectra. The correlative measurement shows that ortho -substitute barely formed a self-assemble monolayer, relative to the para -isomer, which can form a close-packed self-assembled monolayer and perform a decent azo-coupling reaction. Comparison between normal and SERS spectra of ATP isomers supports the fact that additional disulfide- or hydrogen-bonding interactions are established in para -ATP solid crystal, but neither of ortho - nor meta -isomers. This work is expected to create a significant impact on the development of an orthogonally correlated spectroscopic tool in deciphering chemical insights and underlying reaction mechanism.
Graphical abstract
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FOOD CHEMISTRY
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2019
·
IF 5.399
Kaiqiang Wang,Da-Wen Sun,Hongbin Pu,Qingyi Wei
The design of a novel and reliable plasmonic platform for detecting multiple chemical contaminants in the complex matrix is an exciting topic in the food industry. Herein, a high-performance surface-enhanced Raman scattering (SERS) two-dimensional (2D) nanodot array was designed through liquid-liquid interfacial self-assembly of the core-shell nanoparticles (Au@Ag NPs) and exploited for assessment of dual-fungicides in pear, apple, and orange juices. The 2D Au@Ag nanodot array delivered good uniformity and reproducibility with the substrate-to-substrate relative standard deviation values of 10.51%. This substrate could be used for detecting thiram and thiabendazole in aqueous solutions with the limit of detection of 0.0011 and 0.051 ppm, respectively. Furthermore, satisfactory recoveries ranging from 76–134% for the juices were obtained, demonstrating that the high-throughput 2D Au@Ag nanodot arrays are promising for their applications as sensitive SERS platforms for monitoring chemical contaminants in food products, especially in the beverage industry.
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TALANTA
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2019
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IF 4.916
Wenjuan Lv,Chunyan Liu,Yao Ma,Xiang Wang,Juanjuan Luo,Weichun Ye
Nanocomposites of graphene oxide/poly (diallyldimethyl ammonium chloride)/Ag nanoparticles (GO/PDDA/Ag NPs) were constructed via a self–assembly process as a surface-enhanced Raman scattering (SERS) substrate, in which functional macromolecules PDDA were utilized to load GO and support Ag NPs. Fundamental SERS performance of this SERS substrate was evaluated using rhodamine 6G (R6G), which displayed excellent enhancement effect, transferable nature and high stability of the synthesized GO/PDDA/Ag NPs substrate. Furthermore, the synthesized SERS substrate was employed in the sensitive detection of adenine with a linear range of 0.05–1000 μM and low detection limit of 1 nM. Other than the large surface area of GO, multiple-hydrogen bond interactions between adenine and the modified PDDA were another important factor in capturing adenine molecules and enhancing SERS signal. The hydrogen bond interaction was calculated using quantum mechanical calculations. Moreover, determination of adenine in aqueous solutions was achieved with good anti-interference ability against other nucleic bases with similar structures, such as guanine , cytosine and thymine . Therefore, GO/PDDA/Ag can be anticipated to be a potential substrate for label-free, fast and sensitive SERS detection of adenine in the field of bioanalysis .
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