Method for producing new nanomaterials
A technology of nanomaterials and oxides, applied in the field of photocatalysis
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Embodiment 1
[0134] Example 1: Synthesis of Titanium Oxide Containing Surfactant
[0135] Mix 10 g of 37% v / v hydrochloric acid with 50 g of water at 50°C. With vigorous stirring, 1.6 g of Pluronic P123 surfactant was added. After stirring for two hours, 8.47 mL of titanium tetraisopropoxide (or titanium isopropoxide (TiPOT)) was added. Precipitation occurs spontaneously due to the strong reactivity of this precursor in aqueous media. With vigorous stirring, the precipitate was rapidly dissolved before the appearance of a new precipitate arising from the aggregation between the three-dimensional structure derived from the hydrolysis and polycondensation of the titania precursor and the micellar network. The reaction mixture was then placed at 50 °C for 24 h and then at 90 °C for at least 24 h under static conditions. The solution was then filtered. The obtained solid was washed several times with excess water and dried at ambient temperature.
Embodiment 2
[0136] Example 2: Preparation of surfactant-free titanium oxide based nanomaterials by calcination.
[0137] The surfactants of the nanomaterials prepared according to Example 1 were extracted using a calcination-based extraction method.
[0138]According to the method, 1 g of surfactant-containing nanomaterial was placed in a ceramic crucible located in a tube furnace at a temperature of 550° C. for 10-15 minutes. Continuous calcination for 16h. After cooling for 5 hours to return to ambient temperature, the surfactant-free nanomaterial was recovered and weighed.
[0139] Titanium oxide-based nanomaterials from which surfactants are extracted according to this method are hereinafter also referred to as "TiO 2 C".
Embodiment 3
[0140] Example 3: Preparation of a surfactant-free titanium oxide-based nanomaterial according to the present invention.
[0141] The surfactant of the nanomaterial prepared according to Example 1 was extracted in situ during the surfactant removal step according to the present invention.
[0142] For this purpose, first, an aqueous divalent metal salt solution having a concentration of 0.05 mol / L was prepared. Then, 200 ml of this solution was added to the beaker. The pH of this solution was adjusted to the desired value (for Cu 2+ and Zn 2+ is 10.5, and for Ni 2+ is 11.5).
[0143] Several different divalent metal salt solutions were tested: copper(II) nitrate trihydrate solution, nickel(II) nitrate and zinc(II) nitrate solution. Then, at the end of the synthesis of nanomaterials containing surfactants according to Example 1, i.e., before filtration, rinsing and drying, the entire reaction medium (70.5 mL) was added to each alkaline metal salt solution, followed by The...
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Abstract
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