Preparation method of N,N'-bis(2-mercaptoethyl)-1,3-phthalic diamide calcium coordination ion modified bentonite
A technology of calcium phthalamide and phthalamide, which is applied in the field of preparation of N,N'-bis-1,3-phthalamide calcium complex ion-modified bentonite, which can solve secondary pollution and adsorption The problem of weakening force, unable to permanently lock heavy metal ions, etc., achieves the effects of cost saving, increased adsorption capacity, and low cost
Active Publication Date: 2017-03-15
NANJING UNIV OF SCI & TECH
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[0004] CN200910248679.5 Organically modified bentonite and its preparation method; CN201010121822.7 Preparation method of organically modified bentonite; CN201110307128.9 A method of using organic bentonite to treat wastewater. The above patents introduce the technology of organic modifier to treat bentonite, but For modified bentonite, although the interlayer spacing and adsorption capacity are increased due to the pillaring effect of the modifier, the adsorption of heavy metal ions by modified bentonite is mainly due to the original medium-strength The electrostatic interaction becomes a weaker electrostatic interaction, the adsorption force is significantly weakened, the purpose of permanently locking heavy metal ions cannot be achieved, and it is easy to cause secondary pollution
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[0028] Take 50g of raw bentonite and dry it in an oven at 105°C, then pulverize and grind it with a ball mill, pass it through a 100-mesh sieve, mix the obtained product with water at a mass ratio of 1:15, heat to 80°C, and stir thoroughly to obtain suspension. In 200mL suspension, add 10mL, 0.1mol / L Na 2 CO 3 The solution was mixed evenly, and stirred and heated in a water bath at 80° C. for 60 minutes to obtain a sodium bentonite suspension.
[0029] In a three-necked flask under the protection of nitrogen, add mercaptoethylamine hydrochloride with chloroform as a solvent, add triethylamine as an acid application agent, and slowly add isophthaloyl chloride dropwise under stirring in an ice bath to make mercaptoethylamine hydrochloride The molar ratio of salt to isophthaloyl chloride is 2:8. After continuous stirring for 5 hours, extract 2-3 times with deionized water, and dry the organic layer properly with distilled water solvent to obtain the white product NBMIPA, which ...
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The invention discloses a preparation method of N,N'-bis(2-mercaptoethyl)-1,3-phthalic diamide calcium coordination ion modified bentonite. According to the preparation method, a coordination ion prepared from N,N'-bis(2-mercaptoethyl)-1,3-phthalic diamide and Ca2+ is taken as a pillared-reagent to modify bentonite. Physical absorption or chemical adsorption of a large amount of active sites in the interlays of the modified bentonite with molecular or ionic organic pollutants are achieved, so that heavy metal ions and organic pollutants can be removed at the same time; and compared with organic macromolecule modifying agents, the modifying agent in the invention possesses following advantages: adsorption capacity is increased, stable and firm adsorption is realized, heavy metal ions can be immobilized permanently, lasting time is relatively long, and cost is reduced to a certain degree.
Description
technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a preparation method of N,N'-bis(2-mercaptoethyl)-1,3-phthalamide calcium complex ion-modified bentonite. Background technique [0002] Due to its good physical and chemical properties, bentonite can be used as binder, suspending agent, thixotropic agent, stabilizer, purification and decolorization agent, etc. It is widely used in agriculture, light industry, chemical industry and environmental protection. Bentonite is a natural mineral material with a wide range of uses. It is mainly used in the fields of chemical industry and environmental protection to utilize its catalytic and adsorption properties. However, natural bentonite does not have good application performance. Modification of it can greatly improve its interlayer structure and adsorption properties. [0003] The main active ingredient of bentonite is a hydrous layered aluminosilicate mineral, whic...
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IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 夏明珠褚玉婷王风云雷武
Owner NANJING UNIV OF SCI & TECH