Preparation method and adsorption method of Ni<2+> adsorbent

An adsorbent, NH2-SBA-15 technology, applied in the field of mesoporous materials, can solve problems such as secondary pollution, and achieve the effects of wide sources, good application prospects and low-cost coordination ability

Active Publication Date: 2014-12-24
常熟紫金知识产权服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the adsorbent completes the adsorption of heavy metal ions, it is likely to cause secondary pollution

Method used

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  • Preparation method and adsorption method of Ni&lt;2+&gt; adsorbent
  • Preparation method and adsorption method of Ni&lt;2+&gt; adsorbent
  • Preparation method and adsorption method of Ni&lt;2+&gt; adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0022] At 40 °C, dissolve 4 g of P123 into 30 g of deionized water, and then add 120 g of 2 mol L -1 Stir vigorously with HCl; after 2 h, add 8.5 g tetraethyl orthosilicate dropwise, keep stirring at 40 °C for 20 h; then transfer the mixture into a closed reaction kettle, and crystallize at 105 °C for 24 h; , the obtained product was suction filtered, washed three times with absolute ethanol and deionized water; the obtained solid powder was extracted with absolute ethanol at 85 °C for 36 h, and then vacuum-dried at 85 °C for 4 h to obtain SBA-15; N 2 Under protection, 1 g of SBA-15 powder was dissolved in 30 mL of dry toluene, 1 mL of APTES was added dropwise, and refluxed at 110 °C for 18 h; the obtained product was filtered with suction and washed with toluene and absolute ethanol; the product Drying in vacuum at 70°C for 12 h gave NH 2 - SBA-15 powder; in N 2 Under protection, with dimethylformamide as solvent, add 0.5 g NH 2 -SBA-15, 2.5 g L-histidine, 7.5 g dicycloh...

Embodiment 2

[0026] The amino functionalization step of the silicon-based mesoporous material SBA-15 is the same as in Example 1; 2 Under protection, with dimethylformamide as solvent, add 0.5 g NH 2 -SBA-15, 2.5 g L-methionine, 7.5 g dicyclohexylcarbodiimide and 0.5 g 4-dimethylaminopyridine, the reaction temperature was 85 °C, and the reaction time was 60 h; the product was suction filtered, Washing with dimethylformamide and absolute ethanol in sequence, and drying, the obtained product is the L-methionine-modified silicon-based mesoporous material, denoted as Met-SBA-15.

[0027] Measure Ni 2+ The content is 100 mg·L -1 50mL of electroplating wastewater, use 0.1 mol·L -1 NaOH solution was adjusted to pH 5.0, placed in a 250 mL Erlenmeyer flask, added 40 mg of Met-SBA-15, and shaken at 30 °C for 10 min; 2+ The equilibrium adsorption capacity is 88 mg·g -1 , the adsorption experiment results show that L-methionine modified silicon-based mesoporous material Met-SBA-15 2+ Ions have ...

Embodiment 3

[0029] The amino functionalization step of the silicon-based mesoporous material SBA-15 is the same as in Example 1; 2 Under protection, with dimethylformamide as solvent, add 0.5 g NH 2 -SBA-15, 2.5 g L-cysteine, 7.5 g dicyclohexylcarbodiimide, and 0.5 g 4-dimethylaminopyridine, the reaction temperature was 85 °C, and the reaction time was 50 h; the product was suction filtered, Washing with dimethylformamide and absolute ethanol in sequence, and drying, the obtained product is the L-cysteine ​​modified silicon-based mesoporous material, denoted as Cys-SBA-15.

[0030] Measure Ni 2+ The content is 100 mg·L -1 50mL of printing and dyeing wastewater, use 0.1 mol·L -1 NaOH solution was adjusted to pH 4.0, placed in a 250 mL Erlenmeyer flask, added 30 mg of Cys-SBA-15, and shaken at 25 °C for 20 min; 2+ The equilibrium adsorption capacity is 74 mg·g -1 , the results of adsorption experiments showed that the L-cysteine ​​modified silicon-based mesoporous material Cys-SBA-15 ...

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Abstract

The invention discloses a preparation method and an adsorption method of a Ni<2+> adsorbent. The method comprises the following steps: (1) with tetraethoxysilane as a silicon source and triblock copolymer (P123, EO20PO70EO20) as a template agent, synthesizing a silica-based mesoporous material SBA-15, and modifying the inner surface of the silica-based mesoporous material SBA-15 with 3-aminopropyl triethoxy silane (APTES) through an alkyl coupling method to obtain an amino functionalized silica-based mesoporous material NH2-SBA-15; (2) grafting amino acid onto NH2-SBA-15 by a post-transplantation method to obtain the amino acid modified silica-based mesoporous material, namely, the adsorbent; (3) regulating the pH value of the adsorbent to 3-5 by virtue of a water solution containing Ni<2+>, and feeding the adsorbent to adsorb Ni<2+> in a water body, wherein the mass ratio of the adsorbent to Ni<2+> in the water body is 5:1 to 8:1, the adsorption temperature is 20-30 DEG.C, and the adsorption time is 10-30 minutes. The adsorbent preparation method is high in operability and good in reproducibility, the obtained amino acid modified silica-based mesoporous material has a good removal effect for heavy metal ions, Ni<2+>, in a water body, the equilibrium adsorption capacity of the adsorbent reaches up to 60mg.g<-1> above, and thus the actual application value of the adsorbent is good.

Description

technical field [0001] The invention belongs to the technical field of mesoporous materials, in particular to Ni 2+ Preparation of adsorbent and its adsorption method. Background technique [0002] Nickel ions (Ni 2+ ) is a common heavy metal pollutant. Industries such as metal processing, electroplating, chemical ceramics and glass produce a large amount of Ni-containing 2+ waste water. Contain Ni 2+ Wastewater is highly toxic, difficult to biochemically degrade, and difficult to treat. At present, the main treatment methods include adsorption, precipitation, ion exchange, and electrochemical methods. Among them, the adsorption process is simple, and the adsorbent can be reused, especially for low-concentration heavy metal Ni 2+ It has unique advantages in deep processing. [0003] Traditional materials for adsorbing heavy metal ions include activated carbon, resin, zeolite, and clay. However, these materials have disadvantages such as wide pore size distribution, sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/62
Inventor 徐继明相鑫鑫吴真黄进
Owner 常熟紫金知识产权服务有限公司
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