A kind of preparation method and application of PD ion imprinted silica gel adsorbent
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An ion-imprinted silica gel and adsorbent technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of non-environmental grafting efficiency and time-consuming, and achieve high mechanical stability and mechanical strength. High, uniform particle size distribution effect
Active Publication Date: 2019-07-12
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
Therefore, in view of the shortcomings of traditional grafting methods such as time-consuming, not environmentally friendly and low grafting efficiency, it is necessary to optimize the research of traditional grafting methods
Method used
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preparation example Construction
[0027] A preparation method for Pd ion imprinted silica gel adsorbent, comprising the following steps:
[0028] 1) Disperse Pd(II) salt and acid-activated silica gel (SG) in alcohol solvent;
[0029] 2) After reacting chlorosilane with KI, add 2-aminothiazole (abadole) to react under alkaline conditions;
[0030] 3) Step 1) is mixed with the product obtained in step 2);
[0031] 4) The product of step 3) is filtered and washed, and the washed product is extracted and then washed until neutral, and dried to obtain a Pd(II) ion-imprinted silica gel adsorbent.
[0032] Preferably, in step 1), the mass ratio of the Pd(II) salt to the acid-activated silica gel is 1:(6-7).
[0033] Preferably, the Pd(II) salt is PdCl 2 or Pd(NO 3 ) 2 ; Further preferably, the Pd (II) salt is PdCl 2 .
[0034] Preferably, the acid is hydrochloric acid or nitric acid; more preferably, the acid is hydrochloric acid.
[0035] Preferably, in step 1), the alcohol is one of methanol, ethanol, propa...
Embodiment
[0048] 1. Preparation
[0049] 1. Add 10g of silica gel (SG) into 100mL of concentrated HCl, heat to reflux for 6h under stirring, wash with deionized water until neutral, and dry at 180°C for 16h.
[0050] 2. Add 8mL of 3-chloropropyltriethoxysilane (CPTS) to 8g of KI, stir and react at 45°C for 2h, after fully reacting, add 6.5g of 2-aminothiazole (abadole), 0.5mL Ethylamine was stirred at 45°C for 3h.
[0051] 3. Add 1.2g PdCl 2 and 8g of SG were added to 100mL 95% ethanol solution, ultrasonicated until the mixture was uniformly dispersed, then added to the mixed solution in the previous step, heated to reflux for 18h, and filtered;
[0052] 4. Wash the filtered product with toluene, ethanol, diethyl ether and hot water several times in sequence. Wash the product with 200mL4%CS(NH 2 ) 2 and 2mol L- 1 Soxhlet extraction with HCl mixture for 5 h, washed away the imprinted Pd(II), and then washed with absolute ethanol and double distilled water until neutral. Vacuum-dri...
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Abstract
The invention discloses a preparation method and application of a Pd ionic imprinting silica gel adsorbent. The preparation method comprises the following steps: firstly, dispersing Pd (II) salts and silica gel activated by acid in an alcohol solvent; secondly, enabling chlorosilane to react with KI, then adding 2-aminothiazole, and reacting under the action of alkali; thirdly, carrying out mixed reaction on a product obtained in the first step and a product obtained in the second step; fourthly, filtering and washing the product in the third step, extracting the washed product, washing to neutral and drying, thus obtaining a finished product. Meanwhile, the invention discloses the application of the adsorbent in adsorption of Pd ions. According to the preparation method and the application disclosed by the invention, a Pd ionic imprinting polymer is prepared by using an ionic imprinting technology, using the silica gel as a substrate, using 3-chloropropyltriethoxysilane as a cross-linking agent and using 2-aminothiazole as a functional monomer through a polymerization reaction; the Pd ionic imprinting polymer is applied to the research on adsorption of Pd and has the advantages of high mechanical stability, good adsorption selectivity, uniform distribution of particle size, and the like; identification and elution of template ions are facilitated, and an embedding phenomenon can be reduced.
Description
technical field [0001] The invention relates to a preparation method and application of a Pd ion imprinted silica gel adsorbent. Background technique [0002] Silica gel is a highly active and widely used inorganic adsorption material. It is an amorphous substance. Silica gel has stable physical and chemical properties, non-toxic and tasteless, large specific surface area, high mechanical strength, and does not mix with any substances except strong alkali and hydrofluoric acid. React, and insoluble in water and any organic solvents. In addition, a very prominent advantage of silica gel is that its surface contains a large number of silanol groups, which can be further chemically modified to introduce characteristic functional groups to obtain the adsorption requirements for specific target ions. [0003] Unmodified silica gel has poor adsorption capacity and selectivity to metal ions. Therefore, in order to improve the adsorption capacity and selectivity of silica gel mater...
Claims
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