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首页> 外文期刊>Chemistry: A European journal >Preparation of photocatalytic Au-Ag _2Te nanomaterials
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Preparation of photocatalytic Au-Ag _2Te nanomaterials

机译：光催化Au-Ag _2Te纳米材料的制备

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摘要

A facile approach has been developed for the preparation of various morphologies of Au-Ag _2Te nanomaterials(NMs) that exhibit strong photocatalytic activity. Te NMs(nanowires, nanopencils, and nanorice) were prepared from TeO _2 in the presence of various concentrations(16, 8, and 4 M) of a reducing agent(N _2H _4) at different temperatures(25 and 60 °C). These three Te NMs were then used to prepare Au-Ag _2Te NMs by spontaneous redox reactions with Au ~(3+) and Ag ~+ ions sequentially. The Au-Ag _2Te nanopencils exhibit the highest activity toward degradation of methylene blue and formation of active hydroxyl radicals on solar irradiation, mainly because they absorb light in the visible region most strongly. All three differently shaped Au-Ag _2Te NMs(10-μg mL ~(-1)) provide a death rate of Escherichia coli greater than 80 % within 60-min, which is higher than that of 51 % for commercial TiO _2 nanoparticles(100-μg mL ~(-1)). Under light irradiation, the Au NPs in Au-Ag _2Te NMs enhance the overall photo-oxidation ability of Ag _2Te NMs through faster charge separation because of good contact between Ag _2Te and Au segments. With high antibacterial activity and low toxicity toward normal cells, the Au-Ag _2Te NMs hold great potential for use as efficient antibacterial agents.
机译：已经开发了一种简便的方法来制备具有强光催化活性的各种形态的Au-Ag _2Te纳米材料。在不同温度（25和60°C）下，在各种浓度（16、8和4 M）的还原剂（N _2H _4）存在下，由TeO _2制备Te NMs（纳米线，纳米铅笔和纳米米）。然后通过与Au〜（3+）和Ag〜+离子的自发氧化还原反应，使用这三个Te NMs制备Au-Ag _2Te NMs。 Au-Ag _2Te纳米铅笔对亚甲基蓝的降解和在太阳辐射下形成活性羟基自由基的活性最高，这主要是因为它们在可见光区域的吸收最强。三种不同形状的Au-Ag _2Te NMs（10-μgmL〜（-1））在60分钟内提供的大肠杆菌死亡率均大于80％，高于商用TiO _2纳米颗粒的51％（ 100μg毫升〜（-1））。在光照射下，由于Ag _2Te与Au链段之间的良好接触，Au-Ag _2Te NMs中的Au NPs通过更快的电荷分离增强了Ag _2Te NMs的整体光氧化能力。具有高的抗菌活性和对正常细胞的低毒性，Au-Ag _2Te NMs具有用作高效抗菌剂的巨大潜力。

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