High-selectivity magnetic dye adsorbent and preparation method thereof

A high-selectivity, adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems such as limited adsorption capacity, weak selectivity, and cumbersome recovery process of adsorbents

Active Publication Date: 2018-04-03
SHANDONG UNIV
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Problems solved by technology

However, the disadvantages of traditional adsorbents, such as difficult recovery, limited adsorption capacity, low adsorption rate, and weak selectivity, still limit the widespread practical use of most adsorption methods.
For example, Chinese patent document CN105502564A discloses an adsorbent for selectively removing dyes containing sulfonic acid groups in wastewater and a preparation method thereof, using nanosheet-shaped basic copper nitrate as an adsorbent to remove dyes containing sulfonic acid groups in wastewater group of dyes; although the adsorbent has selectivity and high adsorption capacity for dyes containing sulfonic acid groups, the recovery process of the adsorbent is cumbersome and the recovery cost is high, and the single selectivity cannot be used for other types of dyes in wastewater. Effective adsorption and removal, while it may cause secondary pollution t

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  • High-selectivity magnetic dye adsorbent and preparation method thereof
  • High-selectivity magnetic dye adsorbent and preparation method thereof
  • High-selectivity magnetic dye adsorbent and preparation method thereof

Examples

Experimental program
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[0060] Example 1

[0061] A method for preparing highly selective magnetic dye adsorbent, the steps are as follows:

[0062] (1) Magnetic Nano Fe 3 O 4 Preparation

[0063] 2.7g FeCl 3 ·6H 2 O and 7.2g anhydrous NaAc were uniformly dispersed in 100mL ethylene glycol by ultrasonic, stirred overnight at room temperature, heated to 200℃ in an autoclave for 18 hours, and the solid obtained by magnetic field separation was dispersed and washed 5 times in absolute ethanol. , Then vacuum drying at room temperature to obtain magnetic nano Fe 3 O 4 ;

[0064] (2) Nano Fe 3 O 4 -SiO 2 Preparation

[0065] Add 50mg of the magnetic nano Fe obtained in step (1) 3 O 4 Disperse ultrasonically in 150mL of absolute ethanol, add 5mL of 26% by mass ammonia water and 3mL of tetraethylorthosilicate, heat to 50℃ and mechanically stir for 24h, apply magnetic field for separation, and wash alternately with absolute ethanol and deionized water5 Next, vacuum drying at room temperature to obtain nano-Fe 3 O 4 -...

Example Embodiment

[0080] Example 2

[0081] A method for preparing a highly selective magnetic dye adsorbent, as described in Example 1, except that the amount of tetraethylorthosilicate used in step (2) is 1 mL, and the graft rate of the prepared adsorbent is 51.60. %.

[0082] According to the method of Example 1, the adsorption capacity of the adsorbent for organic dyes was tested. The adsorbent prepared in this embodiment has a pH=4 environment for lemon yellow (mass concentration of 1000mg·L -1 ) Has an adsorption capacity of 0.357mmol·g -1 ; In the environment of pH=10, methylene blue (mass concentration of 1000mg·L -1 ) Has an adsorption capacity of 0.511mmol·g -1 .

Example Embodiment

[0083] Example 3

[0084] A method for preparing a highly selective magnetic dye adsorbent, as described in Example 1, except that the amount of tetraethylorthosilicate used in step (2) is 5 mL, and the graft rate of the prepared adsorbent is 88.60 %.

[0085] According to the method of Example 1, the adsorption capacity of the adsorbent for organic dyes was tested. The adsorbent prepared in this embodiment has a pH=4 environment for lemon yellow (mass concentration of 1000mg·L -1 ) Has an adsorption capacity of 0.601mmol·g -1 ; In the environment of pH=10, methylene blue (mass concentration of 1000mg·L -1 ) Has an adsorption capacity of 0.826mmol·g -1 .

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Abstract

The invention discloses a high-selectivity magnetic dye adsorbent and a preparation method thereof. The preparation method comprises the following steps: preparation of magnetic nano-Fe3O4; preparation of nano-Fe3O4-SiO2; surface amino modification of nano-Fe3O4-SiO2; bromination modification of nano-Fe3O4-SiO2-NH2; preparation of nano-Fe3O4-SiO2-PGMA (polyglycidyl methacrylate); and Lysine modification of nano-Fe3O4-SiO2-PGMA. The adsorbent is larger in specific surface area and rich in bisexual activated adsorption sites; high-selectivity separation can be performed on an organic dye such aslemon yellow and methylene blue; the adsorbent is higher in adsorption capacity and high in adsorption rate; due to the characteristic of good magnetic response, cyclic regeneration of a material isensured, and secondary pollution to water bodies can be prevented, and therefore, the adsorbent has a considerable application prospect in the aspect of treatment of water pollution caused by the organic dye.

Description

technical field [0001] The invention relates to a high-selectivity magnetic dye adsorbent and a preparation method thereof, belonging to the field of synthesis of functional polymer materials. Background technique [0002] As an important part of water pollution, dye waste has become one of the deadly threats to the ecosystem. The existence of trace organic dyes is enough to cause obvious coloring of water bodies, thereby reducing the transmittance of sunlight in water, and further affecting the normal operation of water ecosystems including photosynthesis. More seriously, because most organic dyes contain complex structures such as aromatic hydrocarbons, their biodegradation process is relatively slow, and a large number of toxic, pathogenic and teratogenic organic dyes, especially azo dyes, will Accumulates in organisms through the food chain. Considering the severe situation mentioned above, the treatment of water pollution by organic dyes is imminent. [0003] In rece...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/30C02F101/38C02F103/30
CPCB01J20/265B01J20/28009C02F1/285C02F2101/308C02F2101/38C02F2103/30
Inventor 谭业邦荆世尧王鑫
Owner SHANDONG UNIV
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