Preparation method of nanopd/fe oxyhydroxide composite material for repairing groundwater
A technology of oxyhydroxide and composite materials, which is applied in chemical instruments and methods, water pollutants, reduced water/sewage treatment, etc., can solve the problems of no load, difficult to apply groundwater pollution repair, etc., achieve mild conditions, improve reduction and desorption Chlorine effect, effect of improving removal efficiency
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[0020] The preparation method of the nano-Pd / Fe oxyhydroxide composite material for repairing groundwater adopts the following steps:
[0021] (1) Grinding natural volcanic rock minerals into particles with a particle size of 1-3mm;
[0022] (2) Ferrous salt, such as anhydrous FeCl 2 , FeSO 4 ·7H 2 O or FeCl 2 4H 2 Add water and stir to dissolve, control the molar concentration of ferrous iron at 0.1-0.5mol / L, then add volcanic rock particles to the container, the dosage is 10-30 times the mass of ferrous ferrous rock, and the natural volcanic rock mineral used is loose and porous glass quality rock, with a bulk density of 250-450kg / m 3 , the porosity is 60-80%.
[0023] (3) Add dropwise the Na of 1mol / L in the mixed system in step (2) 2 CO 3 Add the aqueous solution at a slow speed and evenly, control the pH of the system to 7-8, and then stir slowly for 20-30min under aerobic conditions;
[0024] (4) adding concentration to the mixed system prepared in step (3) is t...
Embodiment 1
[0028] (1) Grind and sieve the natural volcanic rock minerals to obtain particles with a particle size of 1mm. The natural volcanic rock minerals used are loose and porous glassy rocks with a bulk density of 250kg / m 3 , the porosity is 60%.
[0029] (2) Weigh 69.5g of FeSO 4 ·7H 2 O is placed in the container, add water 0.5L and stir until ferrous salt is all dissolved, and the molar concentration of ferrous is 0.5mol / L, then adds volcanic rock particle 140g in the container, and dosage is 10 times of ferrous quality.
[0030] (3) Add dropwise the Na of 1mol / L in the mixed system in step (2) 2 CO 3 Add the aqueous solution at a slow speed and evenly. After controlling the pH of the system to 7, stir slowly for 30 minutes under aerobic conditions.
[0031] (4) Add 0.5mol / L of PdCl to the mixed system prepared in step (3) 2 In the aqueous solution, the Pd / Fe molar ratio was controlled at 0.1%, and the reaction was continued for 60 minutes before static precipitation, and ag...
Embodiment 2
[0034] (1) Grind and sieve the natural volcanic rock minerals to obtain particles with a particle size of 2mm. The natural volcanic rock minerals used are loose and porous glassy rocks with a bulk density of 400kg / m 3 , with a porosity of 70%.
[0035] (2) Weigh 12.7g of anhydrous FeCl 2 Put it in a container, add 1L of water and stir until the ferrous salt is completely dissolved, the molar concentration of ferrous is 0.1mol / L, then add 112g of volcanic rock particles to the container, and the dosage is 20 times the mass of ferrous.
[0036] (3) Add dropwise the Na of 1mol / L in the mixed system in step (2) 2 CO 3 Add the aqueous solution at a slow speed and evenly. After controlling the pH of the system to 7, stir slowly for 30 minutes under aerobic conditions.
[0037](4) Add 0.5 mol / L PdCl2 aqueous solution to the mixed system prepared in step (3), control the Pd / Fe molar ratio at 0.3%, continue to react for 30 minutes and then precipitate statically, and age at 25°C for...
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