JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·339-345
·
IF 1.947
Zuo Guihong,Wang Anqi,Yang Ying,Huang Hailiang,Wang Fangbiao,Jiang Hongwei,Zhang Lei,Zheng Youjin
Recently, Ag/AgCl has been widely researched by various methods and used as photocatalyst to degrade organic dyes due to its excellent photocatalytic properties under visible light. In this paper, a novel visible-light-driven plasmonic photocatalyst Ag/AgCl@ZIF-8 was successfully prepared by depositing AgCl nanoparticles into the ZIF-8 crystals, and then reducing partial Ag + ions of AgCl nanoparticles to Ag 0 species under UV light irradiation. All as-synthesized samples were characterized by XRD, SEM, TEM, BET and UV–Vis diffuse reflectance spectra. The photocatalytic activity of all as-synthesized samples was evaluated by degradation RhB solution under visible light irradiation. The results show that AgCl nanoparticles are well dispersed and inlaid in the body of ZIF-8 crystals, and partial Ag + ions of AgCl nanoparticles are reduced into Ag 0 species after 30 min of UV light irradiation.The as-synthesized Ag/AgCl@ZIF-8 keeps the high surface area of ZIF-8 and holds the excellent photo-properties of Ag/AgCl. The photocatalytic activity of all as-synthesized sample were evaluated by degradation RhB solution under visible light irradiation. Ag/AgCl@ZIF-8 exhibited the highest photocatalystic activity, which could degrade 99.12% RhB. The synergistic effect of Ag/AgCl and ZIF-8 makes Ag/AgCl@ZIF-8 possible to be used for the degradation of organic dye by using sunlight.
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Jin Feng,Qingshan Shi,Yulian Li,Jianfei Huang,Ruimin Li,Xiulin Shu,Wenru Li,Xiaobao Xie
Nanocomposites composed of Ag and γ-Fe 2 O 3 nanoparticles within poly-γ-glutamic acid (γ-PGA) derived amorphous carbon nitride (a-CN) films (Ag + γ-Fe 2 O 3 @a-CN) were synthesized by a one-step facile pyrolysis strategy. Transmission electron microscopy analysis shows that Ag and γ-Fe 2 O 3 nanoparticles were obtained in situ and homogeneously dispersed on the a-CN matrix. The average size of nanoparticles was 8.1 nm. The presence of γ-Fe 2 O 3 , Ag, and a-CN in the nanocomposite was confirmed by X-ray diffraction analysis, UV–visible absorption spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Ag + γ-Fe 2 O 3 @a-CN catalyzed the degradation of methyl orange. This catalyst was also recycled ten times by magnetic separation without any loss in efficiency. Ag + γ-Fe 2 O 3 @a-CN exhibited strong antibacterial activity against E . coli and S . aureus . It also exhibited excellent antibacterial activity even after 20 times magnetic recycling. This indicates that this is a promising recyclable antibacterial and catalyst for environmental applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Wei Li,Xiao Wang,Min Li,Shu-ao He,Qiong Ma,Xuechuan Wang
Hydrogen is known as an alternative new energy for its advantages of non-pollution and high calorific value, and photocatalysis technology is regarded as one of the most effective means to produce hydrogen in recent years. In this topic, aiming at the poor photoresponse, fast combination of photo-induced carriers and unstable structure of traditional photocatalysts, the three-dimensional porous g-C 3 N 4 /graphene oxide framework was constructed by compounding two-dimensional graphene oxide and two-dimensional g-C 3 N 4 via hard template (SiO 2 nanoparticles) method and selective chemical etching. Then, silver bromide nanoparticles , a superior photosensitizer, were immobilized on the three-dimensional porous framework to construct the three-dimensional porous g-C 3 N 4 /graphene oxide-AgBr photocatalyst with Ag plasmas by solvothermal method. Research showed that this novel photocatalyst based on Z-scheme heterostructure (GO-AgBr), p-n heterostructure (g-C 3 N 4 -AgBr) and Ag plasmas presented high-efficient visible-light driven hydrogen evolution (3.69 mmol/g/h) at the absence of Pt co-catalyst, which is higher than the majority of existing catalysts, and it also possessed strong stability on its activity and structure. Accordingly, the enhanced hydrogen evolution and photostability were attributed to the highly ordered structure and fast interfacial electron conduction of three-dimensional porous framework, superior photosensitivity of AgBr and synergistic effect of Ag plasmas. Therefore, this study provided a potential method for exploitation of hydrogen energy.
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Food Analytical Methods
·
2018
·Vol. 11
·期 11
·3161-3169
·
IF 2.245
Kang Yan,Li Long,Chen Wanchao,Zhang Feiyu,Du Yiping,Wu Ting
A structure of polyurethane micelle/Ag nanoparticle (Ag NP) cluster was fabricated as surface-enhanced Raman scattering (SERS) substrate for in situ extracting organic compounds on the surface of different matrixes, in which polyurethane micelles acted as the host material to capture target molecules and stabilize nanoparticle cluster. This method provided stable aqueous suspensions of Ag NP cluster due to the amphiphilic properties of polyurethane. We demonstrated SERS-based in situ detection of pesticides on vegetables and fruit skin, by simply dropping polyurethane micelle/Ag NPs substrate on the sample surface where the target molecules could be detected without a previous elution and extracting. The obtained results showed that this polyurethane micelle/Ag NP cluster substrate had excellent SERS performance for pesticide molecules with ideal stability and reproducibility. With further optimization, the limit of detection of 0.03 μg/mL acetamiprid, 0.08 μg/mL phosmet, and 0.002 μg/mL thiabendazole was obtained, respectively.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yuqing Chen,Chun Shen,Jie Wang,Gang Xiao,Guangsheng Luo
As the energy shortage and environmental problem become the worldwide concern, the green synthesis of catalysts and their green applications have long been pursued. Here we proposed a facile catalyst synthesis approach in which Ag–TiO2 composites were prepared through an in situ reduction at room temperature without severe conditions or hydrogen atmosphere. Porous glass (PG) was chosen as the support, and the as-prepared Ag–TiO2/PG was equipped with the remarkable merits of intense visible light absorbance, effective separation of electron–hole pairs, high surface areas for adsorption, and abundant reactive sites for the photocatalytic oxidation. Conversions of 95.2% and 92.1% for dibenzothiophene (DBT) and benzothiophene (BT), respectively, were realized under irradiation of energy-saving visible light emitting diodes (LEDs), complying with the principles of “green chemistry”. Moreover, none of the external oxidants, such as H2O2 or O2, was introduced, greatly increasing the viability of industrial applications. Ag–TiO2/PG also showed remarkable activity for removing rhodamine B (RhB), methylene blue (MB), and methylene orange (MO) with the rate constants of 0.14, 0.18, and 0.055 min–1, respectively. The mechanism study revealed that the immobilized Ag acted as the role of “killing two birds with one stone”: enhancing the absorption of visible light, suppressing the recombination of photoinduced electron–hole pairs via trapping electrons, and contributing to the generation of •O2–. In addition, oxygen vacancies, •OH, and h+ also took part in the photocatalytic oxidation. This work explored the green synthesis of Ag–TiO2/PG and characterized their excellent photocatalytic activity for photocatalytic desulfurization and degradation of organic dyes, opening up new possibilities for low-energy-consumption photocatalysis and sustainable chemistry.
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BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Ying Zhu,Xiao-chun Hu,Shuo Shi,Ru-ru Gao,Hai-liang Huang,Yan-yan Zhu,Xiao-yan Lv,Tian-ming Yao
We report here an ultrasensitive strategy based on the recognition-induced conformational alteration of aptamer and fluorescence turn-on abilities of guanine-rich (G-rich) DNA sequence in proximity to silver nanoclusters for adenosine triphosphate (ATP), adenosine (A) and thrombin (TB) detection. Herein, we designed two tailored DNA sequences noted as complementary DNA (abbreviated as c-DNA) and signal probe DNA (abbreviated as s-DNA), respectively. c-DNA is designed as a special structure consisting of a sequence complementary to aptamer at the 3′-end and a guanine-rich DNA sequence at the 5′-end; s-DNA contains a cytosine-rich sequence responsible for Ag NCs templated synthesis at the 3′-end and a link sequence (part of aptamer) complementary to partial of the c-DNA at the 5′-end. In the presence of target, the aptamer associated with the target, resulting in the formation of duplex DNA (dsDNA), the DNA–Ag NCs thereafter could close to the guanine-rich sequence, leading to enhanced fluorescence signal readout. The widespread application of the sensing system is achieved success in the detection of three biomolecules . ATP, adenosine and thrombin in the range of 0.5-8.0 μM, 0.5-7.0 μM and 50-900 nM could be linearly detected with the detection limits of 91.6 nM, 103.4 nM and 8.4 nM, respectively. This label-free and turn-on fluorescent sensing system employing the mechanism proposed here turns out to be sensitive, selective, and convenient for the detection of biomolecules without washing and separation steps.
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TALANTA
·
2015
·
IF 3.545
Junrong Li,Guannan Zhang,Lihua Wang,Aiguo Shen,Jiming Hu
In this work, we suggest a chitosan-modified popcorn-like Au–Ag nanoparticles (CSPNPs) based assay for high sensitive detection of melamine , in which CSPNPs not only provide with an intrinsic peroxidase-like activity but also act as surface enhanced Raman scattering (SERS) substrates. CSPNPs can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H 2 O 2 to the charge transfer complex (CTC), which contributes to a tremendous surface-enhanced resonant Raman scattering (SERRS) signals with 632.8 nm laser excitation. The target molecule melamine can generate an additional compound with H 2 O 2 , which means the available amount of H 2 O 2 for the oxidation of TMB reduced. Correspondingly, the SERRS intensity of CTC is decreased. The decreased Raman intensity is proportional to the concentration of melamine over a wide range from 10 nM to 50 μM ( R 2 =0.989), with a limit of detection (LOD) of 8.51 nM. Moreover, the proposed highly selective method is fully capable of rapid, separation-free detection of melamine in milk powder.
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Analytical Methods
·
2017
·Vol. 9
·期 30
·4363-4370
·
IF 1.9
Chi-Fang Peng,Ying-Ying Zhang,Li-Ying Wang,Zheng-Yu Jin,Guang Shao
In this study, peroxidase-mimicking core–shell Au@Pt nanoparticles (Au@Pt NPs) were synthesized, and both Hg2+ and Ag+ were found to intensively inhibit the catalytic activity of the Au@Pt NPs. The interactions between the two metal ions and Au@Pt NPs were analyzed through characterization by TEM, DLS, EPR and XPS, etc. Based on the inhibition of both Hg2+ and Ag+ toward the catalytic activity of the Au@Pt NPs and the shielding of sodium dodecyl sulfate (SDS) toward interfering metal ions, a highly sensitive and selective colorimetric assay for Hg2+ and Ag+ was developed. In addition, L-cysteine can be used to mask Hg2+ in the presence of Ag+; therefore, a specific detection of Ag+ ions can be accomplished by this Au@Pt NP-based assay. The limits of detection (LODs) for Hg2+ and Ag+ are 3.5 nM and 2.0 nM, respectively. The linear ranges for detecting Hg2+ and Ag+ are from 10 nM to 200 nM and from 5.0 nM to 100 nM, respectively. Moreover, the colorimetric assay is highly selective toward Hg2+ and Ag+ over other common metal ions. This work demonstrates that the optimization of metal nanoparticle preparation and surface modification play very important roles in developing metal ion sensing based on metal NP enzyme mimics. In addition, the metallic nanozyme based colorimetric method here demonstrates advantages in practical applications as it is low-cost, simple, and highly sensitive and selective, although it needs a two-step reaction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Zhiwang Yang,Xueqing Xu,Xixi Liang,Cheng Lei,Yuhan Cui,Wenhua Wu,Yaoxia Yang,Zhe Zhang,Ziqiang Lei
Photocatalytic synthesis using visible light is a desirable chemical process because of its potential to utilize sunlight. A heterostructured MIL-125/Ag/g-C 3 N 4 nanocomposite was implemented as an efficient bifunctional visible-light response catalyst for the photoreduction of nitrocompounds and the oxidation of alcohols. The photocatalyst was prepared via an accessible method and characterized by XRD, SEM, TEM, XPS, FT-IR, N 2 adsorption–desorption isotherm, UV–vis DRS, PL and EIS. The reactive efficiency of the photocatalyst depends on two primary factors, one is the light adsorption of catalysts, Ag nanoparticles (NPs) were photodeposited on the surface of g-C 3 N 4 and MIL-125 to increase visible-light absorption via the surface plasmon resonance. And the other is the separation efficiency of the photogenerated charge carrier. As an electron-conduction bridge in the interface between MIL-125 and g-C 3 N 4 , Ag NPs could facilitate the direct migration of photoinduced electrons from g-C 3 N 4 to MIL-125 and retard the recombination of electron-holes. Therefore, the MIL-125/Ag/g-C 3 N 4 sample shows highest photocatalytic activity compared with MIL-125, g-C 3 N 4 , MIL-125/Ag and MIL-125/g-C 3 N 4 . A corresponding photocatalytic mechanism of these reactions was discussed in detail. Moreover, the photoreduction of nitrocompounds and oxidation of the alcohols with superior conversions and selectivities were obtained, and the catalyst can be recycled four times. It is concluded that MIL-125/Ag/g-C 3 N 4 would be a promising visible light photocatalyst in the field of selective organic transformations.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Guojuan Ren,Qi Zhang,Shuang Li,Shanshan Fu,Fang Chai,Chungang Wang,Fengyu Qu
A kind of biocompatible fluorescent nitrogen doped carbon quantum dots (NCDs) has been synthesized using uric acid as raw material through a facile, effective and green thermal treatment method in one pot. The surface morphology and optical properties of the synthesized NCDs were characterized. Without further chemical modification, the NCDs emit bright blue fluorescence with a high quantum yield of 56% due to the enhancement effect of N dopant atoms on a surface of carbon quantum dots. Owing to the strong blue fluorescence, negligible toxicity and the special response of heavy metal ions, the NCDs have been used as a fluorescence probe for sensitive and selective detection of Hg 2+ and Ag + ions with detection limit of 4.8 nM and 1 nM, respectively. Moreover, it was successfully applied to determination of Hg 2+ and Ag + in real environmental water samples, which offers the advantages of simplicity and cost efficiency.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2017
·
IF 4.421
Bowen Li,Yidi Wang,Fangyuan Tian,Guanshu Li,Zhaohong Zhang,Jun Wang,Youtao Song
In order to expand the light response range of wide band-gap semiconductor photocatalyst (NaTaO 3 ) for effective photocatalytic conversion of Cr(VI), an up-conversion luminescence agent (Er 3+ :YAlO 3 ) is combined with NaTaO 3 and a visible-light driven photocatalyst, NaTaO 3 /Er 3+ :YAlO 3 , is prepared. Moreover, several conduction band co-catalysts (Ag, Au and Pt) are deposited the surface of NaTaO 3 /Er 3+ :YAlO 3 , respectively, to facilitate the transfer rate of photo-generated electrons. X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV–vis diffuse reflectance spectra are determined to explore the visible-light absorption properties of Er 3+ :YAlO 3 , NaTaO 3 , NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt). Photoluminescence (PL) spectra are used to estimate the recombination rate of electron–hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt) are investigated in detail. The results show that the uses of up-conversion luminescence agent (Er 3+ :YAlO 3 ) and co-catalysts (Ag, Au and Pt) can promote NaTaO 3 to utilize visible-light to carry out the photocatalytic conversion of Cr(VI). Particularly, the prepared Au/NaTaO 3 /Er 3+ :YAlO 3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er 3+ :YAlO 3 and NaTaO 3 shows the highest photocatalytic activity in conversion of Cr(VI).
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RSC Advances
·
2017
·Vol. 7
·期 77
·48894-48903
·
IF 3.108
Ziyang Lu,Zehui Yu,Jinbo Dong,Minshan Song,Yang Liu,Xinlin Liu,Di Fan,Zhongfei Ma,Yongsheng Yan,Pengwei Huo
A stable core–shell imprinted Ag-(poly-o-phenylenediamine)/CoFe2O4 (imprinted Ag-POPD/CoFe2O4) was synthesized via the surface imprinting technique. Ag-POPD was introduced into an imprinted layer, which significantly enhanced the photocatalytic activity. Meanwhile, due to the existence of imprinted cavities in the imprinted layer, the imprinted Ag-POPD/CoFe2O4 exhibited the superior specific recognition capability for selective photodegradation of ciprofloxacin (CIP). This work puts forward a novel design idea for synthesizing imprinted photocatalysts.
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