Biochar-loaded magnesium ferrite catalyst for persulfate as well as preparation method and application thereof
A technology of persulfate and magnesium ferrite, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low activation efficiency, secondary pollution, changing pH, etc., and achieve catalytic ability. Stable, high removal rate, low cost effect
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[0031] The first aspect of the present invention provides biochar-loaded magnesium ferrite persulfate catalyst and its preparation method and application. The preparation method comprises the following steps:
[0032] (1) Washing, drying, crushing and sieving the pomelo peel to obtain grapefruit peel powder;
[0033] (2) Soak pomelo peel powder in a mixed solution containing ferric salt and magnesium salt, add alkaline solution dropwise to the mixed solution, and heat to react;
[0034] (3) The solid precipitate obtained in step (2) is separated, dried, and roasted under anaerobic conditions to obtain a biochar-supported magnesium ferrite catalyst.
[0035] Preferably, in step (1), the pomelo peel is dried at 90-110°C, crushed and passed through a 80-100 mesh sieve.
[0036] Preferably, in step (2), the divalent magnesium salt is one or more of magnesium chloride or magnesium acetate, and the ferric salt is one or more of ferric chloride, ferric sulfate, or ferric nitrate Va...
Embodiment 1
[0049] (1) Mix 5g pomelo peel powder, 4.1g MgCl 2 •6H 2O and 10.8 g FeCl 3 •6H 2 O was added to 100mL ultrapure water, and the glass rod was used to continuously stir the mixed solution to accelerate the dissolution while in the ultrasonic water bath. After the solid was completely dissolved, a 5 mol / L NaOH solution was added dropwise to adjust the pH value of the mixed solution to 10. Then the mixed solution was transferred to an electric constant temperature blast drying oven and heated at 60° C. for 4.5 h.
[0050] (2) Separate the solid precipitate generated in step (1), and dry it in an electric heating constant temperature blast drying oven at 100°C. The precipitate was then transferred to a tube furnace under N 2 Baking at 700°C for 2 hours under ambient conditions, N 2 The flow rate was 15 mL / min, and the heating rate of the tube furnace was set at 10 °C / min.
[0051] (3) Grinding the product obtained in step (2) and passing it through a 100-mesh sieve to obtain...
Embodiment 2
[0054] (1) 5g pomelo peel powder, 2.84g magnesium acetate and 16.2g Fe(NO 3 ) 3 •9H 2 O was added to 100mL ultrapure water, and the glass rod was used to continuously stir the mixed solution to accelerate the dissolution while in the ultrasonic water bath. After the solid was completely dissolved, 5 mol / L KOH solution was added dropwise to adjust the pH value of the mixed solution to 11. Then the mixed solution was transferred to an electric constant temperature blast drying oven and heated at 70° C. for 5.5 h.
[0055] (2) Separate the solid precipitate generated in step (1), and dry it in an electric heating constant temperature blast drying oven at 110°C. The precipitate was then transferred to a tube furnace under N 2 Baked at 700°C for 3h under ambient conditions, N 2 The flow rate was 20 mL / min, and the heating rate of the tube furnace was set at 5 °C / min.
[0056] (3) Grinding the product obtained in step (2) and passing it through a 100-mesh sieve to obtain a bio...
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