Method for preparing high-activity gold/zinc oxide composite nanocluster by room temperature one-pot method

Abstract

The invention relates to a method for preparing a high-activity gold / zinc oxide composite nanocluster by a room temperature one-pot method. The method comprises the preparation steps that under room temperature stirring condition, zinc chloride and sodium hydroxide water solutions are sequentially added into a water and glycol mixed solution; after the reaction is performed for 10 to 60 minutes, agold sodium chloride water solution is slowly added drop by drop; the reaction is continuously performed for 10 to 30 minutes; finally, high-speed centrifugal cleaning is performed to obtain the gold / zinc oxide composite nanocluster. The method has the advantages that the operation is simple and convenient; high speed and high efficiency are realized; the cost is low; the energy consumption is low; the raw materials are cheap and can be easily obtained; the large-scale production is easy, and the like. The obtained gold / zinc oxide composite nanocluster has the characteristics that the yield is high; the particles are uniform; the specific surface area is large; the goal consumption is little; the dispersion is easy; the stability is high, and the like. Excellent photocatalytic degradationcharacteristics are realized; the cyclic utilization for many times can be realized; important application values and wide application prospects are realized in aspects of photocatalytic pollutant degradation, photocatalytic hydrogen generation, environmental governance and the like.

Description

technical field [0001] The invention relates to a method for preparing gold / zinc oxide composite nano-clusters with excellent photocatalytic performance in one pot at room temperature, and belongs to the field of nano-composite material preparation. Background technique [0002] Photocatalytic degradation of pollutants is a new type of water treatment technology, which has the advantages of high efficiency, low energy consumption, mild reaction conditions, wide application range, and no secondary pollution. Studies have shown that the more positive the oxidation-reduction potential of the valence band and the more negative the oxidation-reduction potential of the conduction band of semiconductor photocatalytic materials, the stronger the redox ability of photogenerated hole-electron pairs. Among many photocatalytic materials, ZnO has attracted extensive attention due to its high photostability, wide band gap (3.37 eV), high binding energy (60 meV), good catalytic activity, a...

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Problems solved by technology

However, the disadvantage of the above method is that additional reducing agents such as sodium citrate, sodium borohydride, and ascorbic acid need to be introduced in the preparation process or react under high temperature and high pressure conditions, which not only makes the preparation operation complicated, high energy consumption, high cost, and easy to cause environmental pollution

In addition, people recently used gold nanoparticles as seeds to try to synthesize gold@zinc oxide composite nanoparticles with high catalytic activity in oleic acid or ethylene glycol solution ( J. Am. Chem. Soc. , 2011, 133, 5660, J. Am. Chem. Soc., 2013, 135, 9099, Nanoscale , 2013, 5, 11808, Nanoscale , 2016, 8, 10774), but the mass percentage of gold in the obtained gold@zinc oxide composite nanomaterial is relatively high (greater than 40 %), obviously not suitable for large-scale application requirements

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