Nanocomposites with au@feooh SPs heterostructure and their preparation methods and applications
A nanocomposite material and heterostructure technology, applied in the field of nanomaterials, can solve the problems of difficult degradation of aromatic nitro compounds, complex instruments and equipment, cumbersome experimental operations, etc., to achieve improved catalytic performance, simple preparation process, and good dispersion Effect
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[0019] The invention provides a method for preparing Au@FeOOH SPs heterostructure nanocomposite material, the preparation method comprising: adding a mixed solution containing citrate and ferric salt to the mixed aqueous solution of gold nanoparticles, adjusting When the pH reaches 8.5-9.8, urea is added, and the mixed solution of the obtained reaction system is heated for reaction.
[0020] The present invention provides a self-limiting self-assembly method for synthesizing Au@FeOOH SPs heterostructure nanocomposites, which is synthesized in an aqueous solution without using organic solvents such as oleylamine and oleic acid during the synthesis process, which overcomes the need for conventional preparation. Organic solvents such as oleylamine and oleic acid will appear to cover the defects of catalytic active sites, and realize the self-assembly from small-sized nanocrystals to super nanoparticles. The preparation process is simple, the size is uniform, and the dispersion is ...
preparation example 1
[0046] Synthesis of AuNPs:
[0047] Will take 2.5ml 1×10 -2 mol L -1 HAuCl 4 Dissolve in 99mL of water and pour into a 250ml three-necked flask. Heat the solution oil bath to boiling, add 875ul 0.1mol L -1 Sodium citrate, the solution continued to boil for 30 minutes, and naturally cooled to room temperature to obtain a mixed aqueous solution of gold nanoparticles.
[0048] Its TEM picture is as follows figure 1 It can be seen from the figure that there is no coating on the surface of AuNPs.
Embodiment 1
[0050] Get the mixed aqueous solution of gold nanoparticles synthesized in 40mL Preparation Example 1 and carry out centrifugation drying, re-stirring and dispersing in 40mL twice distilled water (the content of gold nanoparticles is 49mg L -1 ), adding 250ul containing 1.5×10 -5 mol citrate and 1×10 -5 mol ferric salt mixed solution (1.5ml 0.1mol L -1 citrate with 1ml 0.1mol L -1 ferric salt mixed), sodium hydroxide to adjust the pH to 9.3, then add 300ul 0.1mol L -1 urea, and the resulting mixed solution was further heated at 100°C for 12h.
[0051] The obtained product was centrifuged at 8000rpm for 10 minutes and washed three times with deionized water, the reactant was concentrated by a rotary evaporator, and then the product was dried in a vacuum oven at 60°C for 12 hours to obtain a monodisperse Au@ FeOOH SPs.
[0052] From the TEM image (see figure 2 ) It can be seen that the composite material synthesized is a super nanoparticle structure, and the shell layer i...
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