Green synthesis of Ag/TiO<sub>2</sub>composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes

Wang, Shuang; Wang, Yujie; Li, Linghan; Li, Lei; Fu, Guoyuan; Shi, Rui; Zou, Xinyu; Zhang, Zhijuan; Luo, Fang

doi:10.1039/d0dt00797h

Cited by 12 publications

(7 citation statements)

References 82 publications

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“…The results of gel electrophoresis and melting curves show that the G31 performs a new intramolecular structure rather than G-quadruplex (Figures S1 and S2). 22,23 We further incubated G31 and CatG4 oligomer in K + solution to form specific secondary structure (probable G-triplex) and G-quadruplex, respectively. The fluorescence was determined after adding ThT and incubating for hours.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As far as we know, most G-triplex researches are focused on a 11-mer sequence (5′-GGTTGGTGTGG-3′) truncated from thrombin binding aptamer (TBA) quadruplex. 16,21,22,24 The melting temperature (Tm) of this observed G-triplex was about 33.5 °C in a buffer solution containing 70 mM K + , suggesting that the structure is instable at physiological temperatures. 16 Therefore, exploiting new G-rich sequences which can form stable G-triplex is desired.…”

mentioning

confidence: 96%

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Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

Zhou

Han

et al. 2018

Anal. Chem.

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G-triplexes have recently been identified as a new kind of DNA structures. They perhaps possess specific biological and chemical functions similar as identified G-quadruplex but can be formed by shorter G-rich sequences with only three G-tracts. However, until now, limited G-triplexes sequences have been reported, which might be due to the fact that their stability is one of the biggest concerns during their functional studies and application research. Herein, we found a G-rich sequence (5'-TGGGTAGGGCGGG-3') which can form a stable G-triplex (Tm ∼ 60 °C) at room temperature. The stable G-triplex can combine with thioflavin T and function as an efficient fluorescence light-up probe. Comparing with the traditional G-quadruplex based probe, this triplex based probe was easy to be controlled and excited. Finally, the probe was successfully applied into constructing a label-free molecular beacon for miRNA detection. Taking advantage of these abilities of the G-triplex based fluorescent probe, the challenges faced during designing G-rich sequences based fluorescent biosensors can be efficiently solved. These findings provide important information for the future application of G-triplex.

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Section: ■ Results and Discussionmentioning

confidence: 99%

mentioning

confidence: 96%

Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

Zhou

Han

et al. 2018

Anal. Chem.

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“…13,14 Moreover, recent studies observed typical positive and negative peaks in circular dichroism (CD) spectra with G-triplexes and found G-triplexes exhibited similar catalytic properties compared with G-quadruplexes. 15,16 Such similarities indicate that stable G-triplexes may be functional even under physiological conditions. However, it is difficult to find the sequences that form stable G-triplex structures since the T m of G-triplexes is significantly lower than that of Gquadruplexes.…”

mentioning

confidence: 98%

“…However, it is difficult to find the sequences that form stable G-triplex structures since the T m of G-triplexes is significantly lower than that of Gquadruplexes. 15 To the best of our knowledge, most of the studies on G-triplexes only focused on 11-mer-TBA (5′-GGTTGGTGTGG-3′) (T m = 33.5 °C), [10][11][12]15,16 TTAGGG repeats (T m = 55 °C), 17,18 and a recently discovered sequence (5′-TGGGTAGGGCGGG-3′) (T m = 60 °C). 19 Hence, studies on stable G-triplexes remain limited, and the functions and applications of G-triplexes need further exploration.…”

mentioning

confidence: 99%

The Exploration of a New Stable G-Triplex DNA and Its Novel Function in Electrochemical Biosensing

et al. 2019

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A G-triplex, a new kind of DNA structure, has been identified as an intermediate in the folding of Gquadruplexes. However, the studies on G-triplexes are still very limited, and the functions and applications of G-triplexes need to be further developed. In this paper, a new G-triplex sequence (5′-CTGGGAGGGAGGGA-3′, G3), obtained by truncating four bases (GGGA) from the 3′ end of an 18-base G-quadruplex sequence (G4), was found to significantly decrease the diffusion current of methylene blue (MB). In particular, we proved that (a) MB stabilized the structure of G3 and increased the T m of G3 considerably based on circular dichroism; and (b) MB formed a 1:1 noncovalent complex with G3 based on electrospray ionization mass spectrometry. Moreover, molecular dynamics simulations established reliable speculation in the folding topology of G3 and interaction sites between G3 and MB. Based on the strong affinity of G3 with MB, we further developed a novel function of G3 as an electrochemical signal read-out and applied it in the fabrication of a sensitive homogeneous electrochemical aptasensor for cocaine. The features we observed in the G3/MB complex will serve as a new inspiring guideline for developing functional short G-rich ligands.

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“…[43][44][45] Compared with above noble metals, Ag is more earth-abundant and thus holds promise for more widespread use. It is established that Ag can improve the electron transfer rate of Ag/TiO 2 hybrid, [46,47] which is beneficial to its applications in photocatalysis (dye degradation, [48,49] H 2 evolution, [50,51] ) and supercapacitor. [52] However, the use of such hybrid in NRR has not been investigated before.In this work, we report on the development of Ag@TiO 2 for N 2 reduction electrocatalysis.…”

mentioning

confidence: 99%

Ag@TiO₂ as an Efficient Electrocatalyst for N₂ Fixation to NH₃ under Ambient Conditions

Li¹,

Cao²,

et al. 2021

ChemistrySelect

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With the use of traditional Haber-Bosch N 2 fixation, a huge amount of CO 2 emission bring a huge burden to the environment. Electrochemical N 2 reduction provides an environmentalfriendly and sustainable alternative to NH 3 synthesis at ambient conditions. Herein, we report our recent experimental finding that Ag composited with TiO 2 can greatly improve the N 2 reduction reaction performance of TiO 2 toward ambient conversion. In 0.1 M Na 2 SO 4 (pH = 7), such electrocatalyst achieves a large NH 3 yield rate of 14.88 μg h À 1 mg À 1 cat. with a Faradaic efficiency of 6.2 % at À 0.70 V vs. reversible hydrogen electrode. Besides, it also demonstrates high electrochemical and structural stability for NH 3 generation. NH 3 is a basic raw material for manufacturing synthetic chemicals, such as fertilizers, dyes, medicaments and explosives, etc. [1][2][3][4][5] Currently, large-scale NH 3 production is still dominated by the Haber-Bosch process with intensive energy input and large amount of CO 2 emission under harsh conditions. [6] Therefore, it is urgent to develop a sustainable and efficient synthetic method for NH 3 production to meet the increasing world demands.Electrochemical N 2 reduction has aroused great attention as an attractive environmental-friendly alternative for artificial N 2to-NH 3 fixation. [7][8][9][10] Nevertheless, this process needs advanced electrocatalysts for the N 2 reduction reaction (NRR) to effectively break the high bond energy of N 2 (940.95 kJ mol À 1 ) and activate dinitrogen for alleviating energy barriers. [11,12] Consequently, considerable attention has recently been paid to the exploration of efficient NRR catalysts. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Among them, TiO 2 is an appealing catalytic material for its chemical and thermal stability, good biocompatibility, and environmentally benigh nature. [33][34][35] Our previous study suggests that TiO 2 nanosheet is active for NRR. [34] Heteroatoms (Cu, [17] B, [36] V, [37] Zr, [38] Fe, [39] La [40] and Mn [41] ) doping and graphene hybridization [42] are also effective strategies to enhance the NRR performance of TiO 2 . Meantime, hybridization with noble metals (Au, Pt, Ru) also leads to improve NRR performance of TiO 2 . [43][44][45] Compared with above noble metals, Ag is more earth-abundant and thus holds promise for more widespread use. It is established that Ag can improve the electron transfer rate of Ag/TiO 2 hybrid, [46,47] which is beneficial to its applications in photocatalysis (dye degradation, [48,49] H 2 evolution, [50,51] ) and supercapacitor. [52] However, the use of such hybrid in NRR has not been investigated before.In this work, we report on the development of Ag@TiO 2 for N 2 reduction electrocatalysis. When tested in N 2 -saturated 0.1 M Na 2 SO 4 , this catalyst achieves a large NH 3 yield rate of 14.88 μg h À 1 mg À 1 cat. with a FE of 6.2 % at À 0.70 V vs. reversible hydrogen electrode (RHE). Meanwhile, outstanding durability and reproducibility are also obtain...

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Green synthesis of Ag/TiO₂composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes

Abstract: The prepared Ag/VPO@TiO2 composites are used for photodegradation of MB under visible light and catalytic reduction of 4-NP molecules.

Cited by 12 publications

References 82 publications

Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

The Exploration of a New Stable G-Triplex DNA and Its Novel Function in Electrochemical Biosensing

Ag@TiO₂ as an Efficient Electrocatalyst for N₂ Fixation to NH₃ under Ambient Conditions

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Green synthesis of Ag/TiO2composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes

Abstract: The prepared Ag/VPO@TiO2 composites are used for photodegradation of MB under visible light and catalytic reduction of 4-NP molecules.

Cited by 12 publications

References 82 publications

Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

Stable and Label-Free Fluorescent Probe Based on G-triplex DNA and Thioflavin T

The Exploration of a New Stable G-Triplex DNA and Its Novel Function in Electrochemical Biosensing

Ag@TiO2 as an Efficient Electrocatalyst for N2 Fixation to NH3 under Ambient Conditions

Contact Info

Product

Resources

About

Green synthesis of Ag/TiO₂composite coated porous vanadophosphates with enhanced visible-light photo-degradation and catalytic reduction performance for removing organic dyes

Ag@TiO₂ as an Efficient Electrocatalyst for N₂ Fixation to NH₃ under Ambient Conditions