Preparation method and application of formed magnetism modified cellulose
A technology of cellulose and carboxymethyl cellulose, which is applied in the field of polymer chemical materials, can solve problems such as poor pore structure and poor hydraulic performance, and achieve the effect of simple and easy preparation process and low raw material cost
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[0013] The preparation method of the molding magnetically modified cellulose of the present invention specifically comprises the following steps:
[0014] Step (1), preparation of modified cellulose: add 90% ethanol to sodium carboxymethyl cellulose until it becomes viscous, and adjust the pH to 1-2, stir for 1 hour, let it stand for 4 hours, and then filter it with suction. After suction filtration, the substances on the filter paper are washed with water and ethanol in sequence, and then dried at 80°C to a constant weight to obtain carboxymethyl cellulose for later use; take diethylenetriamine and the obtained carboxymethyl cellulose at a molar ratio of 4:1 Base cellulose is reacted to obtain modified cellulose, and the reaction temperature is 100°C and the reaction time is 6h;
[0015] Step (2), preparation of shaped magnetically modified cellulose: Fe prepared by co-precipitation method 3 o 4 As magnetic particles, take the magnetic particles for initial ultrasonic treat...
Embodiment 1
[0021] Cd 2+ Preparation of contaminated soil: The soil for the test was taken from the farmland in the suburbs of Shangjie Town, Minhou County, all of which are farmland soil in the plow layer (0-20cm topsoil), and was naturally air-dried indoors to constant weight to remove impurities, and passed through a 20-mesh sieve after grinding , for standby; known through measurement, the pH value of the initial test soil is 4.81, and the cadmium ion concentration is
[0022] 1.9mg / kg, moisture content 18%; take the soil that has been air-dried to constant weight and ground through a 20-mesh sieve, which is the spare soil, and add a cadmium chloride solution with a concentration of 2mol / L to the spare soil at room temperature And stir for 6 hours to ensure that the soil and the configured heavy metal solution, i.e. the cadmium chloride solution, are fully mixed. After the stirring is complete, take it out and place it in a larger tray to air-dry naturally, and stabilize it for 2 week...
Embodiment 2
[0025] Cd 2+ Preparation of contaminated soil: The soil for testing was taken from the farmland of Datian County, Sanming City, all of which were cultivated farmland soil (0-20cm topsoil), and was naturally air-dried indoors to constant weight to remove impurities, and then ground and passed through a 20-mesh sieve for later use; It is known through measurement that the pH value of the initial test soil is 3.5, the concentration of cadmium ions is 2.5 mg / kg, and the moisture content is 20%; the soil that has been air-dried to constant weight and ground through a 20-mesh sieve is the soil for subsequent use. Add the 2.5mol / L cadmium chloride solution to the spare soil at room temperature and stir for 6 hours to ensure that the soil and the prepared heavy metal solution, that is, the cadmium chloride solution, are fully mixed. After the stirring is complete, take it out and place it in a larger tray Naturally air-dried, stabilized and balanced for 2 weeks, obtained the Cd of thi...
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