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Amphiprotic-Gemini type cationic composite adsorbent, and preparation method thereof

A composite adsorption, cation technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of poor adsorption capacity, increased adsorption capacity of organic pollutants and heavy metal anions, heavy metal anions and organic matter adsorption capacity Weak and other problems, to achieve the effect of solving the poor adsorption capacity

Active Publication Date: 2014-04-30
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Currently amphoteric surfactants are used for modification. Compared with the original soil, although the increase in the adsorption of heavy metal cations and organic matter is about 1.0 to 2.5 times and 4.0 to 8.3 times respectively, due to the original soil’s ability to absorb heavy metal anions and organic matter Therefore, the above-mentioned amphoteric modified soil has a small increase in the adsorption capacity of organic pollutants and heavy metal anions, and the adsorption capacity is still poor.

Method used

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Examples

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Effect test

preparation example Construction

[0043] Taking bentonite as an example, the preparation method of amphoteric-Gemini type cationic composite adsorbent of the present invention comprises the following steps:

[0044] First, purify bentonite by conventional methods to increase the cation exchange capacity (CEC) of bentonite.

[0045] The amount of alkyl betaine used to prepare 1 kg of amphoterically modified bentonite samples is calculated according to the CEC of bentonite, and the specific calculation formula is m1=CEC×M1×f1×1000. In the formula, m1 is the mass of alkyl betaine required for the preparation of amphoterically modified bentonite, in g; M1 is the molar mass of alkyl betaine, in g / mol; the preparation of soil samples of other qualities can be enlarged according to the corresponding proportion .

[0046] The amount of alkyl quaternary ammonium salt-type gemini surfactant used to prepare 1 kg of amphoteric-Gemini cationic composite modified bentonite samples is also calculated according to the CEC of...

Embodiment 1

[0049] The present embodiment is dry method preparation, comprises the following steps:

[0050] 1) Add ml of dedecyl dimethyl betaine to 100mL water, heat to dissolve the dedecyl dimethyl betaine, and obtain a dedecyl dimethyl betaine solution. Add dedecyl dimethyl betaine solution to 1000g bentonite by spraying while stirring, then manually or mechanically stir for 20 minutes and then dry to obtain dedecyl dimethyl betaine modified bentonite; where m1=CEC×M1 × f1 × 1000; M1 is the molar mass of dedecyl dimethyl betaine, and f1 is 0.51;

[0051] 2) Heat m2g of octadecyl quaternary ammonium salt-type gemini surfactant to 10°C above its melting point to melt it, and at this temperature, slowly add dedecyl dimethyl betaine modified bentonite in batches to melt In the octadecyl quaternary ammonium salt type gemini surfactant, stir 20min, obtain soil sample;

[0052] Among them, m2=CEC×M2×f2×1000, M2 is the molar mass of the octadecyl quaternary ammonium salt type gemini surfact...

Embodiment 2

[0056] The present embodiment is wet method preparation, comprises the following steps:

[0057] 1) Add ml of octadecyl dimethyl betaine to 2 liters of water, heat to 60°C, stir to dissolve octadecyl dimethyl betaine and make the solution uniform, then use 1mol / L hydrochloric acid to adjust the pH value Be 8, obtain octadecyl dimethyl betaine solution; Wherein, m1=CEC * M1 * f1 * 1000; M1 is the molar mass of octadecyl dimethyl betaine, and f1 is 0.99;

[0058] 2) Add m2g of dodecyl quaternary ammonium salt type gemini surfactant to 2 liters of water, heat to dissolve the dodecyl quaternary ammonium salt type gemini surfactant, then use 1mol / L hydrochloric acid to adjust the pH value to 8, Obtain dodecyl quaternary ammonium salt type gemini surfactant solution; Wherein, m2=CEC * M2 * f2 * 1000, M2 is the molar mass of dodecyl quaternary ammonium salt type gemini surfactant, proportional coefficient f2=f3 -f1, where the value of f3 is 1.99;

[0059] 3) Add 1000g of vermiculit...

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Abstract

The invention discloses an amphiprotic-Gemini type cationic composite adsorbent, and a preparation method thereof. The amphiprotic-Gemini type cationic composite adsorbent is an expansive clay mineral modified by an amphiprotic surfactant and a Gemini type cationic surfactant; the amphiprotic surfactant is alkyl dimethyl betaine, and alkyl carbon chain of alkyl dimethyl betaine possesses 10 to 18 carbon atoms; the Gemini type cationic surfactant is an alkyl quaternary ammonium gemini surfactant, and alkyl carbon chain of the alkyl quaternary ammonium gemini surfactant possesses 10 to 18 carbon atoms. Adsorption capacities of the amphiprotic-Gemini type cationic composite adsorbent obtained via modification on organic pollutants and heavy metal anions are improved, so that a problem that absorption capacity of amphiprotic organic modified soil on pollutants and heavy metal anions is poor is solved. The preparation method of the amphiprotic-Gemini type cationic composite adsorbent is simple, and operation is convenient.

Description

technical field [0001] The invention belongs to the field of environmental treatment, and in particular relates to an amphoteric-Gemini cationic composite adsorbent and a preparation method thereof. Background technique [0002] Due to the influence of many factors such as industrial wastewater discharge, landfill disposal of urban waste, sewage irrigation, sludge land use, pesticide use, and atmospheric deposition, organic substances in the environment (such as benzene, phenol, aniline, polycyclic aromatic hydrocarbons, One or more of organic insecticides, pesticides, etc.), heavy metal anions (such as one or more of arsenate, chromate, etc.) have become the main form of environmental pollution. It can cause the deterioration of the soil and water ecological environment, and may also enter the food chain through the absorption and accumulation of terrestrial and aquatic organisms, thereby causing serious harm to human health. [0003] The removal of organic matter and heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/32C02F1/28C02F1/62C02F101/30
Inventor 孟昭福邓晶
Owner NORTHWEST A & F UNIV
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