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Method for preparing iron oxide nanoparticles by utilizing tea leaves
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A technology of iron oxide nanoparticles and particles, applied in the field of materials, can solve the problems of difficult control of size and performance, limited application, low biocompatibility of iron oxide nanoparticles, etc., and achieve low cost, high immobilization rate, and good cell compatibility Effect
Active Publication Date: 2019-06-14
XINYANG NORMAL UNIVERSITY
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All in all, the iron oxide nanoparticles prepared by the existing preparation methods have defects such as
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Embodiment 1
[0028] A method for preparing iron oxide nanoparticles by using tea leaves, comprising the following steps:
[0029] 1) 7.39g FeCl 3 •6H 2 O (4.44g FeCl 3 ) and 2.714g FeCl 2 • 4H 2 O (1.732g FeCl 2 ) was dissolved in 80mL tea extract, in N 2 Under protection, at a temperature of 70°C and a stirring speed of 1000 rpm, after reflux for 30 minutes, add 20 mL of ammonia water, reflux for 30 minutes, then add 4 mL of 2 mg / mL citric acid, reflux for 60 minutes, cool to room temperature, and obtain a black mixture;
[0030] 2) Wash the black mixture in step 1) with ultrapure water, and separate with a permanent magnet to obtain iron oxide nanoparticles.
Embodiment 2
[0032] A method for preparing iron oxide nanoparticles by using tea leaves, comprising the following steps:
[0033] 1) 7.39g FeCl 3 •6H 2 O (4.44g FeCl 3 ) and 2.714g FeCl 2 • 4H 2 O (1.732g FeCl 2 ) was dissolved in 80mL tea extract, in N 2 Under protection, at a temperature of 60°C and a stirring speed of 900 rpm, after reflux for 40 minutes, add 15 mL of ammonia water, reflux for 40 minutes, then add 4 mL of 2 mg / mL citric acid, reflux for 70 minutes, cool to room temperature, and obtain a black mixture;
[0034] 2) Wash the black mixture in step 1) with ultrapure water, and separate with a permanent magnet to obtain iron oxide nanoparticles.
Embodiment 3
[0036] A method for preparing iron oxide nanoparticles by using tea leaves, comprising the following steps:
[0037] 1) 7.39g FeCl 3 •6H 2 O (4.44g FeCl 3 ) and 2.714g FeCl 2 • 4H 2 O (1.732g FeCl 2 ) was dissolved in 80mL tea extract, in N 2 Under protection, at a temperature of 70°C and a stirring speed of 1100 rpm, after reflux for 20 minutes, add 20 mL of ammonia water, reflux for 20 minutes, then add 5 mL of 2 mg / mL citric acid, reflux for 50 minutes, cool to room temperature, and obtain a black mixture;
[0038] 2) Wash the black mixture in step 1) with ultrapure water, and separate with a permanent magnet to obtain iron oxide nanoparticles.
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Abstract
The invention discloses a method for preparing iron oxide nanoparticles by utilizing tea leaves. The method comprises the following steps: 1) dissolving iron hydrate into a tea water extracting solution; after refluxing for 20 to 40 min under the protection of N2 and under the conditions that the temperature is 60 to 100 DEG C and the stirring speed is 900 to 1100 rpm, adding a precipitating agentand refluxing for 20 to 40 min; then adding a stabilizer and refluxing for 50 to 70 min; cooling to room temperature to obtain a black mixture, wherein the iron hydrate is a mixture of FeCl3.6H2O andFeCl2.4H2O and the stabilizer is citric acid; 2) washing and separating a black mixture in step 1) to obtain the iron oxide nanoparticles. According to the method disclosed by the invention, the citric acid is fixed on the nanoparticles through a homogeneous reaction manner and influences on the immobilization rate of the nanoparticles, caused by an immobilized carrier structure factor in non-homogeneous reaction, are overcome; the obtained nanoparticles have a high immobilization rate and immobilization reaction of the citric acid and reduction reaction of the tea water extracting solution are carried out step by step; when the citric acid is immobilized, the nanoparticles are molded and a preparation process is simplified; and the prepared iron oxide nanoparticles have good monodispersity and cellular compatibility.
Description
technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing iron oxide nanoparticles from tea leaves. Background technique [0002] Tea leaves, which refer to the leaves and buds of tea trees, are currently the most used active medicine in the world, and have the advantages of high water solubility, low toxicity and biocompatibility. Tea Polyphenols (Tea Polyphenols) is a class of soluble components with the most content in tea, and it is also one of the main substances for tea to exert its health care effects, such as: caffeine, theanine, tea saponin, linalool, catechin, etc. , and catechins can also remove dangerous free radicals in the body and prevent the development of various diseases. [0003] At present, researchers at home and abroad have developed a variety of methods to prepare iron oxide nanoparticles, such as: high-temperature pyrolysis of organometallic precursors, synthesis of highly mo...
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