Nanocomposite solid materials based on hexa- and octa-cyanometallates, methods for their preparation and methods for immobilizing inorganic pollutants using said materials
A solid material, nanocomposite technology, applied in the field of ferrite anion, anion, can solve the problems of low specific surface area, low reaction rate and so on
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Embodiment 1
[0283] Embodiment 1: the synthesis of porous glass
[0284] The composition of the initial glass is SiO 2 75mol%;Na 2 O 5mol%; B 2 o 3 20mol%. The precursors used were commercially available SiO 2 Na 2 CO 3 and H 3 BO 3 powder.
[0285] To obtain a batch of 100g of glass, weigh 72.58g of SiO 2 Powder, 8.53g Na 2 CO 3 powder and 39.86g of H 3 BO 3 powder. The silica and sodium carbonate were previously heated to a temperature of 250°C in order to remove any residual traces of water.
[0286]Immediately after weighing, the powders were mixed and placed in a rhodium-platinum crucible and then in a muffle furnace.
[0287] To achieve the synthesis of this glass, a first heat treatment is first carried out according to the following cycle:
[0288] - A ramp from room temperature up to 150°C was carried out at a rate of 100°C / h, after which a plateau of 2 hours was observed at this temperature;
[0289] - Implement a temperature ramp up to 300°C at a rate o...
Embodiment 2
[0298] Example 2: Grafting and Synthesis of Nickel Hexacyanoferrate Nanoparticles in Porous Glass
[0299] -(CH in the glass pores prepared in Example 1 2 ) 2 C 5 h 4 N-grafting is achieved by the following methods: in organic compounds (CH 3 O) 3 Si(CH 2 ) 2 C 5 h 4 In the presence of N, the porous glass powder was refluxed overnight in toluene.
[0300] Then, 2 g of the thus-grafted glass powder was placed in a 3.65×10 -2 M[Ni(H 2 O) 6 ]Cl 2 in solution in methanol.
[0301] The mixture was stirred overnight at room temperature.
[0302] After filtration, the powder was washed several times with methanol and then dried under vacuum at room temperature for 24 hours.
[0303] In the second stage, the powder thus obtained is put into the complex [N(C 4 h 9 ) 3 ][Fe(CN) 6 ] 2.5 x 10 in methanol -2 M solution. The mixture was stirred at room temperature for 48 hours. The powder was then filtered, washed several times with methanol and dried in vacuo. The ...
Embodiment 3
[0305] Embodiment 3: fixing cesium
[0306] Test the fixation of Cs to the grafted glass powder elaborated in Example 2 (see Figure 4 ).
[0307] The solutions used for these tests contained 0.1 mol / L NaNO 3 And the pH is between 7 and 8. Higher sodium nitrate levels are required to properly simulate the ionic strength of actual industrial solutions.
[0308] In a volume of 50 mL of this solution, 4.4 g of CsNO 3 (a concentration of 60.2 mg / L was obtained) and 50 mg of the grafted porous glass obtained in Example 2 (ie, 1 g of the grafted porous glass per L of solution).
[0309] The initial measured concentration (Ci) of Cs was 60.2 mg / L.
[0310] Stir for a total of 25 hours at room temperature. After filtration, the solution was analyzed by ion chromatography.
[0311] After the filtration step, the remaining solution was analyzed.
[0312] The final measured concentration (Cf) of cesium was 44.3 mg / L.
[0313] Calculate the decontamination factor (Kd) by the fo...
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