Preparation method of graphene oxide composite gel applicable to heavy metal adsorption
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A graphene composite, composite gel technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of limited number of oxygen-containing functional groups, and achieve excellent mechanical properties, raw materials are easily available, Simple preparation method
Inactive Publication Date: 2016-05-25
JISHOU UNIVERSITY
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However, the number of oxygen-containing functional groups (carboxyl and hydroxyl) that play an important role in the adsorption of heavy meta
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[0032] A preparation method for a graphene oxide composite gel applied to heavy metal adsorption, the specific steps are as follows:
[0033] ①Weigh 6.67g of prefabricated 3%wt graphene oxide hydrogel (containing 200mg of pure graphene oxide) in a small beaker, add 30mL of distilled water and stir for 1-2min, then put it in an ultrasonic cleaner for ultrasonic dispersion for 30min, stop the ultrasonication and drop Add concentrated ammonia water to adjust the pH of the suspension to 10.0-11.0;
[0034] ②Use a 50mL graduated cylinder to take 13.0mL of the pre-made sodium acrylate solution with a concentration of 0.388g / mL and pour it into a small beaker, adjust the pH to 10.0-11.0 with 0.1mol / L NaOH solution, and then add distilled water to make about 40mL of the solution;
[0035] ③ Accurately weigh 5.0g of acrylamide, add distilled water to a small beaker, and stir with a glass rod to fully dissolve it to form a transparent solution of about 40;
[0036] ④Put the liquids obt...
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Abstract
The invention discloses a preparation method of a graphene oxide composite gel applicable to heavy metal adsorption. The preparation method comprises the following steps: by using sodium acrylate and acrylamide as monomers, a graphene oxide hydrogel as an additive, potassium persulfate as an initiator, N,N-methylene-bis-acrylamide as a crosslinking agent and deionized water as a reaction solvent, adding the potassium persulfate and N,N-methylene-bis-acrylamide into a graphene oxide-sodium acrylate-acrylamide mixed water liquid to react at 45-60 DEG C in an N2 atmosphere for 2-3 hours, thereby obtaining a massive composite hydrogel product; and carrying out freeze-drying and vacuum drying on the composite hydrogel product to obtain the macroporous network-polymer graphene oxide composite gel. The graphene oxide composite gel can be well used in treating wastewater containing Pb<2+> and Cd<2+>, and has the advantages of low cost and simpler preparation method.
Description
technical field [0001] The invention relates to the field of preparation of heavy metal adsorption materials, in particular to a preparation method of graphene oxide composite gel applied to heavy metal adsorption. Background technique [0002] Heavy metals refer to elements with a specific gravity greater than 4.0 and are toxic to organisms, mainly including Hg, Cd, Pb, As, Cr, Ni, Cu, Zn, etc. Heavy metal pollution mainly comes from a large amount of wastewater discharged from industries such as mining, mineral processing, chemical industry, printing and dyeing, electroplating, batteries, paint, ceramics, pesticides and fertilizers. Heavy metals are widely distributed in water, air, soil and organisms, and water is the main medium of its pollution. Even if the concentration of heavy metals entering water is very low, once absorbed by aquatic organisms, they will accumulate to a higher level because they cannot be biodegraded. Concentration, through drinking water and food...
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