Catalytic performance of TiO2@Ag composites prepared by modified photodeposition method

Phase change materials (PCMs) have been widely used as efficient materials in latent heat thermal storage systems for various applications. The poor thermal conductivity of most organic PCMs, however, has long been considered as one of big obstacles hindering their practical applications. Here, we report the first example of in situ reduction of AgNO3 precursor by PEG for preparation of polyethylene glycol/silver nanoparticles (PEG/Ag) PCMs nanocomposites with enhanced thermal conductivity only though a simple blending and heating process, without using any complicated techniques. The prepared Ag nanoparticles show a well dispersion in PEG matrix and the Ag is mainly existed in a zero of valence status. As expected, a maximum value of 211.7 % of that of pure PEG in thermal conductivities of the resulting PEG/Ag PCMs were achieved. The latent heat for PEG/Ag PCMs nanocomposites were evaluated in the range from 121.9 J g−1 to 141.9 J g−1. Owing to high latent heat and excellent thermal conductivity, such PEG/Ag PCMs may have great potentials for energy saving applications. Especially, the in situ preparation of PEG/Ag makes it possible for site operation and scaled‐up production, which is of great technologically significance for realization of PCMs into real applications.

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“…The result proved that Ag nanoparticles certainly existed in the form of metallic Ag. Similar results were also obtained by Ma et al …”

Section: Resultssupporting

confidence: 92%

In Situ Preparation of Polyethylene Glycol/ Silver Nanoparticles Composite Phase Change Materials with Enhanced Thermal Conductivity

et al. 2017

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“…8d, the 4-NP reduction reaction into 4-AP is very slow without catalyst addition (k ¼ 0.002 min À1 ); this result is conrmed in several studies. 29,38,59 However, when pure zinc oxide was prepared according to our previous work, 60 the reaction rate wasn't signicantly affected (k ¼ 0.006 min À1 ). It is thus deduced that, under these conditions, pure zinc oxide does not effectively catalyze the 4-NP reduction reaction under these conditions.…”

Section: Catalytic and Sonocatalytic Activitymentioning

confidence: 92%

Highly efficient catalytic/sonocatalytic reduction of 4-nitrophenol and antibacterial activity through a bifunctional Ag/ZnO nanohybrid material prepared via a sodium alginate method

et al. 2019

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“…04-0783). 21 To further confirm the presence and distribution of Ag NPs on the TiO 2 microspheres, electron mapping analysis was shown in Figure 4 shows nitrogen adsorption properties of m-TiO 2 and Ag-1/m-TiO 2 . The m-TiO 2 has a type-IV curve with a H1 hysteresis loop, corresponding to the mesoporous characteristic.…”

Section: Structural Features and Morphologymentioning

confidence: 99%

“…In addition, two sets of lattice fringes of 0.345 nm and 0.238 nm are assigned to the TiO 2 and Ag respectively (JCPDS card. 21 and JCPDS card. 04-0783).…”

Section: Structural Features and Morphologymentioning

confidence: 99%

Synthesis and efficient photocatalytic activity of Ag-nanoparticles-decorated mesoporous TiO2 spheres

Cui¹,

Li²,

Zhao³

et al. 2018

Mater. Tehnol.

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Nano-heterostructures that integrate the advantages of nanomaterials and heterojunctions have attracted wide interest in photocatalysis. Herein, heterostructured Ag-nanoparticles-decorated mesoporous TiO2 spheres (Ag/m-TiO2) photocatalyst has been successfully prepared by a facile method. The results show that numerous Ag nanoparticles with diameters less than 5 nm dispersed homogenously onto the mesoporous TiO2 spheres and consequently form heterostructures. N2 adsorption-desorption measurements indicate that the resultant products were porous with highly specific surface area. When used to photodegradate methylene blue (MB), the Ag/m-TiO2 heteroarchitecture exhibits significantly enhanced photocatalytic performance compared with mesoporous TiO2 spheres (m-TiO2). Furthermore, the photocatalytic mechanism also has been discussed. Nanoheterostrukture, ki zdru`ujejo dobre lastnosti nanomaterialov in heterospojev, so pritegnile pozornost raziskovalcev fotokatalize. V prispevku avtorji opisujejo enostavno metodo za uspe{no pripravo fotokatalizatorja, in sicer z Ag nanodelci dekoriranih mezoporoznih TiO2 kroglic (Ag/m-TiO2). Rezultati karakterizacije so pokazali, da so se {tevilni Ag nanodelci s premerom manj kot 5 nm homogeno razpr{ili na mezoporozne TiO2 kroglice. Posledi~no so tako nastale heterostrukture. Adsorpcijsko-desorpcijske N2 meritve nakazujejo, da so bili nastali produkti porozni z zelo specifi~no povr{ino. Heterostruktura Ag/m-TiO2 ka`e ob~utno pove~ano fotokataliti~no u~inkovitost v primerjavi z mezoporoznimi TiO2 kroglicami (m-TiO2) pri njegovi porabi za fotodegradacijo metilenskega modrila (MB). Nadalje avtorji v~lanku razpravljajo {e o fotokataliti~nih mehanizmih.

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Catalytic performance of TiO2@Ag composites prepared by modified photodeposition method

Cited by 57 publications

References 35 publications

In Situ Preparation of Polyethylene Glycol/ Silver Nanoparticles Composite Phase Change Materials with Enhanced Thermal Conductivity

In Situ Preparation of Polyethylene Glycol/ Silver Nanoparticles Composite Phase Change Materials with Enhanced Thermal Conductivity

Highly efficient catalytic/sonocatalytic reduction of 4-nitrophenol and antibacterial activity through a bifunctional Ag/ZnO nanohybrid material prepared via a sodium alginate method

Synthesis and efficient photocatalytic activity of Ag-nanoparticles-decorated mesoporous TiO2 spheres

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