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Process for preparing montmorillonite loading nano titanium dioxide heavy metal adsorbent

A nano-titanium dioxide, montmorillonite technology, applied in chemical instruments and methods, other chemical processes, animal feed and other directions, can solve the problems of low adsorption rate, environmental protection, insufficient heavy metal adsorption rate, etc. simple effect

Inactive Publication Date: 2005-09-21
ZHEJIANG DAYANG BIOTECH GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this additive has following deficiency: 1, the adsorption rate to heavy metal is not high enough, as only have 98%, 90%, 62%, 87%, 75% to the in vitro adsorption rate of lead, cadmium, arsenic, mercury, nickel, tin and antimony %, 65%, 70%, especially the adsorption rate of arsenic, tin, etc. is less than 70%, and the adsorption rate in the body is even lower
2. The cost of jet milling is relatively high; 3. Sodium chloride is used in the pulping process, which will bring about environmental protection or increase the cost of water treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of heavy metal adsorbent of the present invention is as follows:

[0015] 1) Stir the montmorillonite with water in the reaction kettle to make a 10-30% suspension, stir and disperse at high speed for 2-8 hours;

[0016] 2) Add nano-titanium dioxide aqueous solution made of nano-titanium dioxide according to the weight ratio of montmorillonite under high-speed stirring, heat to 75-96°C and react for 2-10 hours; after cooling down, filter, wash with water, and use deionized water to remake Slurry, filter, and wash 4 to 6 times until there is no Cl - ;

[0017] 3) After the filter cake is vacuum-dried at a temperature lower than 95°C, it is heat-treated at 200-600°C for 1-5 hours, crushed and packaged to obtain the product.

Embodiment 1

[0019] (1) Add water to 200g of montmorillonite to make a 15% suspension, stir and disperse at high speed for 5 hours;

[0020] (2) Add 0.8 times the amount of montmorillonite to a 20% concentration of transparent liquid made of nano-titanium dioxide under high-speed stirring, heat up to 95°C and react for 3 hours; cool down and filter, wash with water, re-pulp, filter, and wash with deionized water 5 times to no Cl - ;

[0021] (3) After drying at 90° C., heat treatment at 400° C. for 3 hours, and pulverize to obtain 347 g of the product.

Embodiment 2

[0023] (1) Add water to 50g of montmorillonite to make a 10% suspension, stir and disperse at high speed for 6 hours;

[0024] (2) under high-speed stirring, add montmorillonite 6 times the amount of nano-titanium dioxide to make a transparent liquid with a concentration of 20%, heat up to 95° C. and react for 3 hours; cool down and filter, wash with deionized water, re-pulp, filter, Wash 5 times to Cl-free - ;

[0025] (3) After drying at 90° C., heat treatment at 400° C. for 3 hours, and pulverize to obtain 325 g of the product.

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PUM

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Abstract

The invention relates to a method for preparing a heavy metal adsorbent, characterized in that it is a loading compound of the nanometer titania and the montmorillonite, wherein the mass ration of the montmorillonite and the nanometer titania is 1:0.1~6. The method comprises the following steps: 1) adding the water to the montmorillonite and stirring them to form the suspending liquid; 2) adding the nanometer titania solution when stirring, and heating them to react, and cooling, filtering, rinshing, then slurrying, filtering, and rinshing many times until there has no C1; 3) vacuum drying the filter cake, annealing, disintegrating and packing to get the product.

Description

technical field [0001] The invention relates to a feed additive, in particular to a preparation method of a montmorillonite loaded nano titanium dioxide heavy metal adsorbent. Background technique [0002] Chinese patent document CN1371619A discloses a "preparation method of nano-feed additives for reducing heavy metal residues in livestock and poultry and aquatic products". ore pulp; 2) adding chitosan, stirring reaction, aging, washing, dehydration; 3) drying and pulverizing filter residue. The feed additive provided by the invention is not affected by the pH of the intestinal tract, has a small dosage, and has no residue in the animal body. But this additive has following deficiency: 1, the adsorption rate to heavy metal is not high enough, as only have 98%, 90%, 62%, 87%, 75% to the in vitro adsorption rate of lead, cadmium, arsenic, mercury, nickel, tin and antimony %, 65%, 70%, especially the adsorption rate of arsenic, tin, etc. is less than 70%, and the adsorption ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12
Inventor 徐进谢利华
Owner ZHEJIANG DAYANG BIOTECH GROUP