Preparation method of nanometer magnetic material NiFe2O4@ N-C for adsorbing tetracycline hydrochloride
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A tetracycline hydrochloride and magnetic nanotechnology, applied in the field of adsorption, can solve the problem that environmental pollutants polluted by antibiotics have not been effectively removed
Inactive Publication Date: 2019-04-12
JILIN INST OF CHEM TECH
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[0002] For decades, scholars have developed some efficient methods for removing traditional pollutants (metals and organic pollutants) in the water environment, such as adsorption, coagulation / flocculation, photocatalysis, chemical oxidation, ion exchange, and biodegradation, but antibiotic pollution Environmental pollutants have not been effectively removed
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Embodiment 1
[0017] Example 1: Synthesis of NCHSs: Dissolve 12 mL of ethanol in water with a graduated cylinder, mix well, and drop 1 mL of NH 3 .H 2 0 (25%), after magnetic stirring at room temperature, slowly drop into 0.5 mL TEOS (tetraethyl silicate), continue to stir, then drop into 8 mL dopamine (50 mg / mL), stir for 32 h, centrifuge, wash, dry. The obtained black powder was transferred to a porcelain boat, and in a tube furnace with nitrogen as a protective gas, the temperature was programmed to rise to 800°C at 5 °C / min and kept for calcination for 3 h to obtain a black solid powder, namely NHCS balls, for future use.
[0018] NiFe 2 o 4 @ Synthesis of N–C: Weigh a small amount of NHCS spheres and dissolve them in 60ml of water, ultrasonically disperse, and then add 0.2 mmol Ni(NO 3 ) 2 .6H 2 O, 0.4 mmol Fe(NO 3 ) 3 .9H 2 O, 0.38 mmol sodium citrate, 1 mmol NH 4 F, 5 mmol urea, add while stirring, mix well and put into the kettle at 150°C for 36 h. After cooling, wash wit...
Embodiment 2
[0019] Example 2: Preparation of NHCS spheres in Example 1. The volume of ammonia water is 1-3 mL, the volume of ethanol is 10-15 mL, and then TEOS (tetraethyl silicate) is added in a volume of 0.5-1 mL, dopamine ( 50 mg / mL) in a volume of 7-9 mL.
Embodiment 3
[0020] Embodiment 3: For the NHCS ball described in Embodiment 1, the calcination temperature is 600-800°C, and the heating rate is 5-10°C / min.
[0021] Embodiment 3: the preparation hollow NiFe in embodiment 1 2 o 4 The Ni(NO 3 ) 2 .6H 2 O concentration is 0.2-0.6 mmol, Fe(NO 3 ) 3 .9H 2 The concentration of O is 0.4-1.2 mmol, and Ni(NO 3 ) 2 .6H 2 O: Fe(NO 3 ) 3 .9H 2 The molar ratio of O is 1:2; sodium citrate (0.35-0.4 mmol), NH 4 F (1-3 mmol), urea (5-10 mmol).
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Abstract
The invention provides a preparation method and application of hollow spherical NiFe2O4@ N-C, and belongs to the field of adsorbing materials. According to the product, N-doped carbon composite hollowspheres (NCHSs) as a template is compounded with Ni(NO2)2 6H2O, Fe(NO3)3 9H2O, sodium citrate, NH4F and urea as raw materials to prepare the NiFe2O4@N-C nanometer spheres with a hollow structure, wherein the NiFe2O4@N-C nanometer spheres are formed through aggregation of nanosheets, and the diameter of the NiFe2O4@N-C nanometer spheres is 200-300 nanometers. The hollow NiFe2O4@N-C nanometer spheres are high in degree of crystallinity, perfect in crystal form and capable of adsorbing tetracycline hydrochloride. Besides, the hollow NiFe2O4@N-C nanometer spheres have excellent magnetic performance and can be recycled. Through the test results of the embodiment, it can be known that when the hollow spherical NiFe2O4@ N-C as the adsorbing material is used for adsorbing the tetracycline hydrochloride, the maximal adsorption capacity is 271.739 mg / g; moreover, through cyclic tests, it can be known that the adsorbing agent is high in recycling ability and high in stability and has a practicalapplication value.
Description
technical field [0001] The invention relates to the field of adsorption technology, in particular to a hollow spherical NiFe 2 o 4 @ N–C preparation method, this material can be applied to the adsorption of tetracycline hydrochloride. Background technique [0002] For decades, scholars have developed some efficient methods for removing traditional pollutants (metals and organic pollutants) in the water environment, such as adsorption, coagulation / flocculation, photocatalysis, chemical oxidation, ion exchange, and biodegradation, but antibiotic pollution Environmental pollutants have not been effectively removed. Traditional physical, chemical, and biological methods have been used to treat antibiotic-containing wastewater, such as adsorption, photocatalysis, flocculation / coagulation, membrane filtration, fungal treatment, and oxidation. Among these technologies, adsorption technology has become one of the most convenient, common and promising technologies due to its advan...
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