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Pillared modified kieselguhr for adsorbing Pb<2+> and/or Cd<2+> and preparation method and application of pillared modified kieselguhr

A diatomite and modification technology is applied in the field of environmental protection adsorption material preparation to achieve the effects of simple process, low energy consumption and no secondary pollution

Active Publication Date: 2012-10-03
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, some foreign scholars have carried out pillared modification research on clay minerals such as montmorillonite, and achieved certain results, but for the adsorption of heavy metal ions, the application of pillars to the modification of diatomite has not been reported yet.

Method used

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  • Pillared modified kieselguhr for adsorbing Pb&lt;2+&gt; and/or Cd&lt;2+&gt; and preparation method and application of pillared modified kieselguhr
  • Pillared modified kieselguhr for adsorbing Pb&lt;2+&gt; and/or Cd&lt;2+&gt; and preparation method and application of pillared modified kieselguhr
  • Pillared modified kieselguhr for adsorbing Pb&lt;2+&gt; and/or Cd&lt;2+&gt; and preparation method and application of pillared modified kieselguhr

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, based on the Pb in the adsorption solution 2+ When applying the method of the present invention to prepare the pillared modified diatomite, the specific implementation steps are as follows.

[0035] (1) Preparation of materials: Take an appropriate amount of diatomite raw ore to grind in a mortar, pass through a 100-mesh nylon sieve; take an appropriate amount of sieved diatomite in a beaker, add concentrated sulfuric acid with a volume fraction of 98%, and stir for 12 hours. Stand still for 12 hours to obtain purified diatomite; take a certain concentration of AlCl 3 The aqueous solution is placed in a beaker, and the molar ratio [OH-] / [Al 3+ ]=2.4 ratio, measure the corresponding amount of sodium carbonate solution, slowly drop into AlCl 3 In aqueous solution; stirring continuously, the reaction temperature is set to 60°C, and the reaction time is set to 2h; after the reaction is completed, the solution is moved into an ultrasonic scrubber of a certain...

Embodiment 2

[0061] Embodiment 2, based on the Cd in the adsorption solution 2+ When applying the present invention to prepare pillared modified diatomite, the specific implementation steps are as follows.

[0062] (1) Preparation of materials: the method steps are the same as in Example 1.

[0063] (2) Determination of modification conditions: the method steps are the same as in Example 1. See Table 10-15 for relevant data.

[0064] Table 10 Effect of concentration of column liquid on adsorption capacity of modified diatomite

[0065]

[0066] Table 11 Effect of [Al] / soil molar mass ratio on the adsorption capacity of modified diatomite

[0067]

[0068] Table 12 Effect of reaction temperature on the adsorption capacity of modified diatomite

[0069]

[0070] Table 13 Effect of reaction time on the adsorption capacity of modified diatomite

[0071]

[0072] Table 14 Effect of activation temperature on the adsorption capacity of modified diatomite

[0073]

[0074] Tab...

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Abstract

The invention discloses pillared modified kieselguhr for adsorbing Pb<2+> and / or Cd<2+> and a preparation method and application of pillared modified kieselguhr. The method comprises the following steps of: preparing pillaring liquid at a certain molar concentration according to requirements; allowing the prepared pillaring liquid to react with purified kieselguhr in a molar mass ratio of [Al] to kieselguhr of (10-15 mmol / g):1 at the temperature of between 60 and 80 DEG C for 120 to 180 minutes, putting the mixture into a drying oven, and activating at the temperature of between 105 and 120 DEG C for 16 to 18 hours to obtain polyhydroxy aluminum pillared modified kieselguhr. Compared with the conventional kieselguhr modifying method of washing, acid washing, roasting, microwaves and the like, the preparation method for the pillared modified kieselguhr has the advantages that the adsorption performance of the kieselguhr on Pb<2+> and Cd<2+> can be improved obviously; the adsorption capacity of the modified kieselguhr on Pb<2+> and Cd<2+> is improved by 31.1 percent and 45.7 percent respectively compared with kieselguhr raw ores; a process is simple and low in energy consumption; and effluent generated in the acid-washing process can be used as wastewater for treating a flocculating agent, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the field of preparation of environmentally friendly adsorption materials, in particular to a method for adsorbing Pb 2+ and / or Cd 2+ Pillared modified diatomaceous earth and methods for its preparation and application. Background technique [0002] Diatomaceous earth is a kind of porous biological siliceous rock formed after the accumulation of diatom remains of ancient single-celled lower plants through preliminary diagenesis. The material composition is mainly diatoms, the mineral composition is amorphous opal, and the chemical composition is amorphous SiO 2 and a small amount of Al 2 o 3 , Fe 2 o 3 , CaO, MgO, TiO 2 、Na 2 O et al. Diatomite is a solid acid with weak acidity, and there are a large number of silanol groups on the surface and pores. These silanol groups are the essence of diatomite's physical and chemical properties such as surface activity, adsorption, negative charge and weak acidity. At present, m...

Claims

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Application Information

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IPC IPC(8): B01J20/14B01J20/28B01J20/30B01D15/08C02F1/28C02F1/62
Inventor 王平朱健张烨罗文连李科林雷明婧
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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