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Modified sepiolite as well as preparation method and application thereof

A sepiolite and modification technology, applied in chemical instruments and methods, other chemical processes, inorganic chemistry, etc., can solve the problems of low heavy metal adsorption, high production energy consumption, complex process, etc., and achieve improved adsorption and adsorption Speed, low cost, and the effect of optimizing the process

Pending Publication Date: 2021-07-09
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this modification method needs to be calcined at a high temperature before the inner pores of the sepiolite can be opened, the production energy consumption is high and the process is complicated, and the disclosed sepiolite has a low adsorption capacity for heavy metals.

Method used

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  • Modified sepiolite as well as preparation method and application thereof
  • Modified sepiolite as well as preparation method and application thereof
  • Modified sepiolite as well as preparation method and application thereof

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preparation example Construction

[0043] The invention provides a kind of preparation method of modified sepiolite, comprises the following steps:

[0044] (1) adding sepiolite to potassium dihydrogen phosphate solution and stirring;

[0045] (2) ferric chloride solution is added to the mixed solution of step (1) and maintained stirring;

[0046] (3) adjust the pH of the mixed solution and maintain stirring;

[0047] (4) Washing, suction filtering, drying, grinding and sieving the reacted sepiolite to obtain modified sepiolite.

[0048] Preferably, the amount of sepiolite added in step (1) is 5-15 g; more preferably, the amount of sepiolite added is 10 g.

[0049] Preferably, the concentration of potassium dihydrogen phosphate solution in step (1) is 0.7~1.0mol / L, and the addition amount of potassium dihydrogen phosphate solution is 120~150mL; more preferably, the concentration of potassium dihydrogen phosphate solution is 0.8mol / L, The amount of potassium dihydrogen phosphate solution added is 140mL.

[0...

Embodiment 1

[0067] A kind of modified sepiolite, its preparation method comprises the steps:

[0068] (1) Weigh 5g of sepiolite powder, add it to a beaker containing 120mL, 1.0mol / L potassium dihydrogen phosphate, and react at 20°C and 200r / min for 1.5h;

[0069] (2) Add 80mL, 1.8mol / L ferric chloride to the mixed solution in step (1), maintain the reaction temperature and stirring speed for 1.5h;

[0070] (3) Add dropwise 1 mol / L sodium hydroxide to the new mixed solution in step (2) to adjust its pH to 9.0, and maintain the reaction temperature and stirring speed for 3 hours.

[0071] (4) Rinse the reacted sepiolite 5 times with deionized water and place it in an oven, set the drying temperature to 50°C, and dry for 6 hours; grind the dried sepiolite and pass through a 100-mesh sieve The modified sepiolite was obtained after sieving with a net.

Embodiment 2

[0073] A kind of modified sepiolite, its preparation method comprises the steps:

[0074] (1) Weigh 15g of sepiolite powder, add it to a beaker containing 150mL, 0.7mol / L potassium dihydrogen phosphate, and react at 30°C, 400r / min for 0.5h;

[0075] (2) Add 120mL, 1.2mol / L ferric chloride to the mixed solution in step (1), maintain the reaction temperature and stirring speed for 0.5h;

[0076] (3) Add dropwise 1 mol / L sodium hydroxide to the new mixed solution in step (2) to adjust its pH to 10.0, and maintain the reaction temperature and stirring speed for 1 h.

[0077] (4) Rinse the reacted sepiolite 5 times with deionized water and place it in an oven, set the drying temperature to 80°C, and dry for 4 hours; grind the dried sepiolite and pass through a 100-mesh sieve The modified sepiolite was obtained after sieving with a net.

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Abstract

The invention belongs to the field of adsorption materials, and provides modified sepiolite as well as a preparation method and application thereof. The modified sepiolite is prepared by the following steps: (1) adding sepiolite into a monopotassium phosphate solution and stirring; (2) adding a ferric trichloride solution into the mixed solution in the step (1) and keeping stirring; (3) adjusting the pH value of the mixed solution and maintaining stirring; and (4) carrying out flushing, suction filtration, drying, grinding and sieving on the sepiolite after the reaction is finished, so as to obtain modified sepiolite. The preparation method is low in cost, simple, convenient and feasible, and sepiolite can be modified without high-temperature calcination. The sepiolite provided by the invention can be used for adsorbing heavy metals in a water body, and has an excellent cadmium adsorption effect.

Description

technical field [0001] The invention relates to the field of adsorption materials, in particular to a preparation method and application of modified sepiolite. Background technique [0002] Water heavy metal pollution is a serious environmental pollution, which mainly comes from human production activities, such as mining, electroplating, smelting and so on. These heavy metals are non-degradable, easily accumulate in the water environment, and accumulate in the human body through the food chain, directly endangering human health. [0003] Commonly used methods for removing heavy metals from water include chemical precipitation, ion exchange, flotation, membrane separation, electrochemical treatment, coagulation-flocculation, and adsorption. Compared with other methods, the adsorption method has the advantages of mature technology, high treatment efficiency, and environmental friendliness. In recent years, as a material with huge reserves, wide sources and certain adsorptio...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20
CPCB01J20/10C02F1/281C02F2101/20
Inventor 郑刘春任静静张丹凤蔡嘉哲程露王昕颖何俊峰
Owner SOUTH CHINA NORMAL UNIVERSITY
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