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Adsorbing substance for absorbing heavy metal ion and preparation method thereof

A technology for adsorbing heavy metals and adsorbents, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as difficult large-scale industrial applications, weak adsorption capacity, strong odor, etc. Adjust, improve regeneration ability, increase the effect of adsorption capacity

Inactive Publication Date: 2009-07-15
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Chinese patent 200410070107.X proposes a preparation method of a heavy metal ion adsorbent, using non-ionic polymers as templates, using (MeO) 3 SiCH 2 CH 2 Si(OMe) 3 and (MeO) 3 SiCH 2 CH 2 CH 2 The SH mixture is a silicon source copolymerized into an organic / inorganic hybrid material containing -SH adsorption center to adsorb heavy metal ions; but the raw material (MeO) used in this method 3 SiCH 2 CH 2 CH 2 SH has a strong odor, which is harmful to the environment and the human body; and the -SH group is easily oxidized into a sulfonic acid group in the air, and its application value is limited
[0003] Chinese patent 200510045500.8 proposes a new type of silica gel-loaded cross-linked chitosan heavy metal ion adsorbent, which uses epoxy group and water-soluble inorganic silane reagent γ-glycidoxypropyltrimethoxysilane as raw material for cross-linking Chitosan: The adsorbent prepared by this method only contains one functional group, which has the disadvantages of unadjustable group type, weak adsorption capacity, and difficult desorption, and the raw material variety is single and the source is limited, so it is difficult for large-scale industrial application
[0004] So far, there are no reports on adsorbents containing acidic and basic groups for the adsorption of heavy metal ions

Method used

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  • Adsorbing substance for absorbing heavy metal ion and preparation method thereof
  • Adsorbing substance for absorbing heavy metal ion and preparation method thereof
  • Adsorbing substance for absorbing heavy metal ion and preparation method thereof

Examples

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Embodiment 1

[0030] Example 1. Preparation of an adsorbent for adsorbing heavy metal ions with reactant ratio pyromellitic anhydride (PMDA):anilinomethyltriethoxysilane (ND-42):bromoethane=4:1:6

[0031] In a 250ml three-necked flask equipped with a stirrer, air or nitrogen was introduced first, then 15ml of N,N-dimethylformamide (DMF) was added, and 10.12g of pyromellitic anhydride (PMDA) was added under the condition of air or nitrogen. ); make it dissolve under constant stirring, then add dropwise 2.5ml mass percent composition and be 95% anilinomethyltriethoxysilane (ND-42) solution to carry out epoxy ring-opening reaction, control the mol ratio of reactant For pyromellitic anhydride (PMDA): anilinomethyltriethoxysilane (ND-42) = 4:1 (that is, keep the excess of PMDA). In the process of adding the silane coupling agent, it can be found that the two react violently and release a lot of heat, indicating that the reaction is in progress, and pyromellitic anhydride dissolves quickly. When...

Embodiment 2

[0037] Example 2. Preparation of an adsorbent film for adsorbing heavy metal ions with reactant ratio pyromellitic anhydride (PMDA):anilinomethyltriethoxysilane (ND-42):bromoethane=4:1:6 piece

[0038] Using the same device and operating steps as in Example 1, under the temperature condition of -78°C, dissolve 10g of the raw material with 20ml of solvent N, N-dimethylformamide (DMF), and then carry out the amination reaction at a temperature of 30°C. Dissolve the product of the amination reaction with DMF solvent, and then use the solution in Al 2 o 3 Dip the coating film on the ceramic substrate until the membrane is obtained, and dry the membrane by infrared rays for 12 hours in an environment at 200°C and a relative humidity of 70% to obtain a hybrid membrane. The membrane of the hybrid membrane can be used for adsorption Adsorbent for heavy metal ions. In order to ensure the completeness of the ring-opening reaction and improve the ability of the adsorbent to absorb hea...

Embodiment 3

[0042] Example 3. Preparation of pyromellitic anhydride (PMDA): anilinomethyltriethoxysilane (ND-42): catalyst: ethyl bromide = 4:1:0.001:6 for the adsorption of heavy metal ions in the ratio of reactants Adsorbent

[0043] Using the same device and operation steps as in Example 1, at a temperature of 60°C, in the hybrid precursor solution prepared in Example 1, the molar ratio is silane coupling agent: water: catalyst = 1:0.01: Add deionized water and catalyst triethylamine at 0.001, stir until a uniform solution is obtained, and then carry out amination reaction on the solution. During the amination reaction, add haloalkane bromide ethyl bromide to the above solution at a molar ratio of 6 times the silane coupling agent. Alkanes, so that it contains basic and acidic groups, the resulting substance after the reaction is washed with deionized water or ethanol, and dried at 150 ° C for 12 hours to obtain an adsorbent that can be used to adsorb heavy metal ions. It contains carb...

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Abstract

The invention discloses an adsorbent for adsorbing heavy metal ions, and the preparation method of the adsorbent. The invention is characterized in that a silane coupling agent and acid anhydride are in epoxy ring cleavage reaction in inert atmosphere or air at the temperature of minus 78 to 200 DEG C, wherein the mol ratio of the silane coupling agent to the acid anhydride is 1 : 2 to 20; after the reaction product is dissolved by a solvent, halogenated alkane is added to the solution according to the mol ratio of two to ten times of the silane coupling agent, the amination reaction is carried out at the temperature of 0 to 200 DEG C, and then, the product generated by the amination reaction is cleaned with water or ethanol and is dried to obtain the adsorbent for adsorbing the heavy metal ions. In the adsorbent, acidic groups are arranged on both sides of a molecular backbone, and basic groups are positioned on the molecular backbone. The adsorbent has stronger capability for adsorbing heavy metal ions, such as Pb2+, Cu2+ and the like in the solution, and can be used for adsorption separation and purification treatment of waste water containing heavy metal ions.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an adsorbent for adsorbing heavy metal ions and a preparation method thereof by utilizing epoxy ring-opening reaction and amination reaction. Background technique [0002] Chinese patent 200410070107.X proposes a preparation method of a heavy metal ion adsorbent, using non-ionic polymers as templates, using (MeO) 3 SiCH 2 CH 2 Si(OMe) 3 and (MeO) 3 SiCH 2 CH 2 CH 2 The SH mixture is a silicon source copolymerized into an organic / inorganic hybrid material containing -SH adsorption center to adsorb heavy metal ions; but the raw material (MeO) used in this method 3 SiCH 2 CH 2 CH 2 SH has a strong odor, which is harmful to the environment and human body; and the -SH group is easily oxidized into a sulfonic acid group in the air, and its application value is limited. [0003] Chinese patent 200510045500.8 proposes a new type of silica gel-loaded cr...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 刘俊生马跃邵国泉张凌云
Owner HEFEI UNIV
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