Polluted water body heavy metal adsorption material and preparation method thereof

A technology for adsorbing materials and heavy metals, applied in the fields of phytochemistry and adsorption science, can solve problems such as destroying ecological balance, existing fire hazards, and polluting the environment, and achieves good adsorption capacity, significant removal effect, and good adsorption effect.

Inactive Publication Date: 2009-08-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the straw is used as fuel or directly burned in the field, which not only destroys the ecological balance, depletes the soil fertility, causes a vicious cycle in agriculture, but also

Method used

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  • Polluted water body heavy metal adsorption material and preparation method thereof
  • Polluted water body heavy metal adsorption material and preparation method thereof
  • Polluted water body heavy metal adsorption material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Wash the corn stalks, dry them, and pass through a 10-mesh sieve after crushing; add corn stalks and ultrapure water into a four-necked flask equipped with a nitrogen inlet tube, an electric stirrer and a condenser tube, and the weight of the corn stalks and ultrapure water The ratio is 1:100; nitrogen gas is introduced and the temperature is raised to 90°C, then potassium permanganate is added as an initiator to make its concentration 0.0025mol / L, and the time for stirring and pre-oxidation is 5 minutes; acrylonitrile is added successively as a monomer , nitrogen, nitrogen-methylenebisacrylamide as a crosslinking agent and concentrated sulfuric acid as a catalyst for graft copolymerization, nitrogen, nitrogen-methylenebisacrylamide consumption is 0.1% of the corn stalk quality, and the acrylonitrile concentration is 1.5 mol / L, sulfuric acid concentration is 15mmol / L, the time of graft copolymerization reaction is 5 hours; Add polymerization inhibitor hydroquinone solutio...

Embodiment 2～13

[0045] According to the preparation conditions shown in Table 1, the operation steps of Example 1 were repeated for preparation.

[0046] The adsorption materials prepared in Examples 1-13 were respectively added to the solution of 100 mg / L heavy metal cadmium ions. The amount that adds is 1% of solution weight, is 120r / min, water temperature 25 ℃, and the pH value is 6.8 under the condition of shaker rotating speed, adsorption 12 hours, the removal rate of cadmium ion is as follows: Figure 8 shown. Depend on Figure 8 It can be seen that the adsorption material prepared in Example 12 has the highest removal rate of cadmium ions, which is 98%; while the adsorption material prepared in Example 8 has the lowest removal rate of cadmium ions, only 11%.

Embodiment 14

[0048] Clean the straw straw, dry it, and pass it through a 10-mesh sieve after crushing; add the straw straw and ultrapure water into a four-necked flask equipped with a nitrogen inlet tube, an electric stirrer and a condenser tube, and the weight of the straw straw and ultrapure water The ratio is 1:100; nitrogen gas is introduced and the temperature is raised to 90°C, then potassium permanganate is added as an initiator to make its concentration 0.0025mol / L, and the time for stirring and pre-oxidation is 5 minutes; acrylonitrile is added successively as a monomer , nitrogen, nitrogen-methylenebisacrylamide as a crosslinking agent and concentrated sulfuric acid as a catalyst for graft copolymerization, nitrogen, nitrogen-methylenebisacrylamide consumption is 0.1% of the quality of rice straw, and the concentration of acrylonitrile is 1.5 mol / L, sulfuric acid concentration is 15mmol / L, the time of graft copolymerization reaction is 5 hours; Add polymerization inhibitor hydroqu...

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Abstract

The invention discloses a method for preparing a heavy metal adsorption material for polluted water. The method comprises that: corn stalk or straw stalk is used as a raw material; under conditions of the temperature of between 40 and 90 DEG C, using 0.0025 to 0.03mol/L potassium permanganate as an initiator, 0.1 to 3.0mol/L acrylonitrile as a monomer and 0.1 to 3.0 percent of nitrogen and nitrogen-methylene-bisacrylamide as crosslinking agents, the raw material is subjected to graft copolymerization, and under the condition of using 1 to 25 mmol/L sulfuric acid as a catalyst, the raw material is subjected to graft copolymerization for 1 to 6 hours; the reaction product is washed by ethanol, suction-filtered, and dried to obtain a coarse product; and the coarse product is placed in a soxhlet extractor to continuously extract the grafting product for 42 to 48 hours, washed by ethanol, washed by deionized water until the pH value is between 6.5 and 7.0 and dried to obtain the heavy metal adsorption material for polluted water. The adsorption material has better adsorption capability on the heavy metal cadmium ions.

Description

technical field [0001] The invention belongs to the field of phytochemistry and adsorption science, and in particular relates to a heavy metal adsorption material in polluted water and a preparation method thereof. Background technique [0002] The massive discharge of industrial and mine wastewater and slag is the main reason for the serious pollution of heavy metals in my country's surface water. Cadmium is one of the more harmful heavy metals. As early as 1974, the United Nations Environment Program and the International Labor Health Heavy Metal Committee designated it as a key pollutant. Once excessive cadmium enters the environment, it cannot be biodegraded, but can remain latent in the environment for a long time and enter the human body through the food chain to cause harm. The half-life of cadmium in the living body is 10 to 30 years, and it is known to be the most easily accumulated toxic substance in the body. The hazards to the health of the population are chara...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 党志郑刘春易筱筠
Owner SOUTH CHINA UNIV OF TECH
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