TiO2 nanotube arrays decorated with Au and Bi2S3 nanoparticles for efficient Fe3+ ions detection and dye photocatalytic degradation

Abstract

Due to increasingly serious environmental problems, many researchers are investigating green clean-energy to solve the world's energy supply issues. So a strategy that Au nanoparticles (Au NPs) and bismuth sulfide (Bi2S3) NPs are used to evenly decorate TiO2 nanotube arrays (TiO2 NTAs) was carried out. Composite materials demonstrated enhanced solar light absorption ability and excellent photoelectrochemical performance. This was attributed to the presence of Bi2S3 NPs with a narrow band gap and the decoration with noble metallic Au NPs which resulted in local surface plasmon resonance (LSPR) effects. The Au/Bi2S3@TiO2 NTAs composites exhibit improved photocatalytic activity for the degradation of methylene blue (MB) under irradiation of UV and visible light. Moreover, the Au/Bi2S3@TiO2NTAs exhibits high fluorescence emission at 822 nm. Due to the better binding affinity between Bi2S3, TiO2 and Fe 3+ ions, the synthesized nanocomposites exhibit high selectivity to Fe 3+ ions. The number of binding sites for Au/Bi2S3@TiO2 NTAs was estimated to be 1.41 according to the double logarithmic regression method. The calculated value of "K" was 1862 M -1 . Fluorescence emission intensity decreases with increasing concentration (30 μM to 5000 μM). The detection limit of the synthesized sensor is 0.221 µM.

A Photoelectrochemical Sensor Based on TiO2 Nanotube Arrays Decorated with Nickel-Cobalt Layered Double Hydroxides for the Effective and Sensitive Detection of Chromium(VI)

“…TiO 2 -based semiconductor materials have been regarded as some of the most promising photocatalytic materials because of their low cost, nontoxicity, good chemical stability, and suitable band energy level for water splitting. − One-dimensional (1D) TiO 2 nanotube arrays (TiO 2 NTAs) with unique structural architectures and the properties of electrical conductivity and photostability are known to be favorable candidates in photocatalysis applications. − Recently, many efforts focusing on the visible-light harvesting and intrinsic charge separation and transport of TiO 2 NTAs materials have been devoted to improving the PEC performance through doping, − dye sensitization, , the construction of a heterojunction. − Some modified TiO 2 NTAs materials have been applied in the highly efficient photocatalytic reduction and removal of Cr­(VI) from water. ,, In addition, the cocatalyst modification strategy has been extensively utilized to accelerate the separation of photogenerated charge carriers, especially to improve the efficiency of photocatalytic water splitting at the electrode/electrolyte interfaces. − Among the various cocatalysts, two-dimensional layered double hydroxides (LDHs) with high specific surface area, short charge-carrier diffusion length, and numerous electrochemical active sites have been proven to be excellent cocatalysts for hydrogen/oxygen evolution reactions (HER/OER). − Up to now, different kinds of LDHs were used to improve the PEC water-splitting performances, such as NiCo, ZnFe, ZnCo, CoAl, and NiFe . Several studies have focused on the cocatalyst effect of LDHs-modified TiO 2 -based photocatalytic materials, − especially the NiCo-LDHs-modified TiO 2 NTAs photoanode, which exhibited a significantly improved PEC water-splitting performance including a large photocurrent density, low onset potential, and excellent long-term stability compared with other TiO 2 -based photoelectrodes .…”

Design and Study of a Photo-Switchable Polymeric System in the Presence of ZnS Nanoparticles under the Influence of UV Light Irradiation

“…Polymers 2022, 14, 945 2 of 16 In the literature, several inorganic nanoparticles (NPs) such as SiO 2 [5,6], ZnO, [7,8], ZnS [9], Ag [10][11][12], CuO [13,14], MoS 2 [15] and TiO 2 [16][17][18] have been shown to be useful for the preparation of functional materials [19][20][21][22]. On the other hand, the establishment of multiple functions requires the combination of hydrophobic surfaces with micro/nanoscale structures, low surface energy and auxiliary components [23][24][25][26][27].…”

Multifunctional fabrics finished using electrosprayed hybrid Janus particles containing nanocatalysts

“…In the literature, inorganic nanoparticles (NPs) and nanotubes made of materials such as SiO2 [27,28], ZnO [29][30][31][32], Ag [33][34][35][36][37], CuO [38], MoS2 [39], and TiO2 [40][41][42][43][44] have all been demonstrated be suitable for the preparation of functional fabrics [45,46]. TiO2 NPs have received particular attention for preparing multi-functional fabrics owing to their stability, high surface activity, non-toxic and biocompatible nature, and antibacterial properties after irradiation with UV light [47,48].…”