Method for preparing porous nano magnesium oxide by using corn straw template method and application of porous nano magnesium oxide
A nano-magnesium oxide and corn stalk technology, applied in the field of nanomaterials, can solve the problems of limited microbial degradation ability, reduced farmland utilization, air pollution, etc., and achieve the effects of easy operation, increased adsorption performance, and increased contact area.
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Embodiment 1
[0027] Example 1: Preparation of Porous Nano Magnesium Oxide Using Corn Stalk Core as a Template
[0028] This example provides a method for preparing porous nano-magnesia with a corn stalk template, specifically preparing porous nano-magnesia with the corn stalk core as a template, and the steps are as follows:
[0029] (1) The corn stalk core was cut into 1 cm thin slices, washed several times with deionized water, then the straw core was boiled with 0.3% NaOH for 30 min, washed with deionized water until neutral, and dried at 60°C for later use. 0.3% NaOH preparation method: Weigh 0.30g NaOH, dissolve it in deionized water and make it into a 100ml volumetric flask.
[0030] (2) Weigh 1 g of the pretreated corn stalk core, dip it in the precursor solution of 0.3 mol / L magnesium acetate hexahydrate, boil it for 1 h, let it stand for 24 h, wash it several times with deionized water until neutral , pH meter to check the pH of the last washing solution = 7.0, dry at 60°C, and r...
Embodiment 2
[0033] Example 2: Preparation of Porous Nano Magnesium Oxide Using Corn Stalk Skin as a Template
[0034] This example provides a method for preparing porous nano-magnesia with a corn stalk template, specifically preparing porous nano-magnesia with corn stalks as a template, the steps are as follows:
[0035] (1) Corn stalks were cut into thin slices of 1 cm, washed several times with deionized water, then boiled with 0.3% NaOH for 4 hours, washed with deionized water until neutral, and dried at 60°C for later use. 0.3% NaOH preparation method: Weigh 0.30g NaOH and dissolve it with deionized water, and dilute to a 100ml volumetric flask.
[0036](2) Weigh 1g of corn stalk husk and dip it in the precursor solution of 0.3mol / L magnesium acetate hexahydrate, boil it for 1h, let it stand for 24h, wash it several times with deionized water until it is neutral, and check it with a pH meter. The pH of the first wash is 7.0, dried at 60°C, and soaked twice; boil each time. 0.3mol / L ...
Embodiment 3
[0039] Example 3: Performance evaluation of porous nano-magnesia photocatalytic degradation of methylene blue
[0040] The porous nano-magnesia material prepared in embodiment 1 and embodiment 2 is used for the methylene blue in the sunlight catalytic degradation simulation wastewater, and its method is as follows:
[0041] (1) Take 100mL of methylene blue solution and add 100mg of the prepared product magnesium oxide, under dark conditions, stir at room temperature to reach adsorption and analysis equilibrium;
[0042] (2) Put it under sunlight, take 10ml of the supernatant every 1h, centrifuge, observe and measure the absorbance of methylene blue at 663nm with an ultraviolet-visible spectrophotometer.
[0043] Photocatalytic degradation of methylene blue by magnesium oxide prepared from corn stalks:
[0044] In step (1), take 100 mL of 10 mg / L methylene blue solution and place it in an Erlenmeyer flask, add 100 mg of magnesium oxide, a product prepared from corn stalks, and...
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