Process for preparing heavy metal adsorbent by waste plants

An adsorbent and heavy metal technology, which is applied in the fields of adsorbing water/sewage treatment, water pollutants, water/sludge/sewage treatment, etc. Simple and efficient effects

Inactive Publication Date: 2017-01-04
熊小芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods commonly used to treat wastewater containing heavy metals include flocculation, advanced oxidation, membrane separation, electrolytic reduction, etc. These methods are difficult to be widely used due to low treatment efficiency or high cost. People began to look for cheap and easy to obtain , a widely used method for treating wastewater
In recent years, the method of removing heavy metals through the adsorption of living organisms has attracted attention. This method mainly uses hyperaccumulative plants, algae, and microorganisms to have a large adsorption capacity for heavy metals to remove heavy metals in wastewater, but using living organisms to remove heavy metals Treatment of sewage is limited by the biomass and growth characteristics of the organism itself, so so far this type of method is not suitable for large-scale applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take an appropriate amount of yam residue, wash it with tap water first, then wash it with distilled water, dry it at 80°C to constant weight, grind the dried product into powder, pass through a 60-mesh sieve, collect the powder, weigh 50g of the obtained powder and soak In deionized water, add 2 mL each of the activated 0.01 mol / L amylase solution and protease solution, react at 35-50 ° C for 1 hour, then add 10 mL of 0.05 mol / L NaOH solution, react for 50 minutes, and then use h 2 SO 4 Neutralize the solution, filter the neutralized liquid, and then dry it; mix the dried powder and urea in a mass ratio of 1:1, then re-immerse in deionized water, react at 50°C for 6 hours, filter, Afterwards, wash with deionized water 3 times to remove residual ionic liquid, and then wash with 95% alcohol twice, and put it into an electric heating constant temperature drying oven at 50°C to dry to obtain a horseshoe slag heavy metal adsorbent.

Embodiment 2

[0021] Take an appropriate amount of yam residue, wash it with tap water first, then wash it with distilled water, dry it at 80°C to constant weight, grind the dried product into powder, pass through a 60-mesh sieve, collect the powder, weigh 50g of the obtained powder and soak In deionized water, add 2 mL of activated 0.05 mol / L amylase solution and 2 mL of protease solution, react at 35-50 ° C for 2 hours, then add 10 mL of 0.1 mol / L NaOH solution, react for 50 minutes, and then use h 2 SO 4 Solution neutralization. Filter the neutralized liquid, and then dry it; mix the dried powder and urea in a mass ratio of 1:1, then re-immerse in deionized water, react at 50°C for 8 hours, filter, and then use deionized Wash with water for 3 times to remove residual ionic liquid, and then wash with 95% alcohol for 2 times. After washing, put it into an electric heating constant temperature drying oven at 50°C to dry to obtain a horseshoe slag heavy metal adsorbent.

Embodiment 3

[0023] Take an appropriate amount of yam residue, wash it with tap water first, then wash it with distilled water, dry it at 80°C to a constant weight, grind the dried product into powder, pass through a 60-mesh sieve, collect the powder, add an appropriate amount of deionized water, Add 2 mL of activated 0.05 mol / L amylase solution and 2 mL of protease solution, react at 50 °C for 2 hours, then add 5 L of 0.1 mol / L NaOH solution, react for 1 hour, and then use H 2 SO 4 Neutralize the solution, filter the neutralized liquid with a plate-and-frame compressor, and then dry it; mix the dried powder and urea at a mass ratio of 1:1, put it into a 3-ton sanitary tank, and inject it into a deionized tank Water, kept at 50°C for 8 hours, filtered, and then washed with deionized water for 4 times to remove residual ionic liquid, after washing, dried and dried at 50°C to obtain a horseshoe slag heavy metal adsorbent .

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PUM

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Abstract

The invention discloses a process for preparing a heavy metal adsorbent by waste plants. The specific process includes the steps: firstly, cleaning an appropriate quantity of Chinese yam residues by tap water and distilled water and drying the Chinese yam residues to reach constant weight; secondly, grinding the Chinese yam residues into powder and sieving the powder; thirdly, performing reaction of the sieved powder, amylase and protease for 1-2 hours under a certain condition, adding reactants into NaOH solution, performing reaction for 30-60 minutes, neutralizing the reactants with dilute H2SO4 solution, filtering and drying the reactants, mixing the reactants with urea according to a certain ratio, adding an appropriate amount of deionized water, performing reaction for 5-10 hours under the condition of 50 DEG C and then filtering the solution; finally, cleaning the reactants by the deionized water and drying the reactants to obtain the heavy metal adsorbent.

Description

technical field [0001] The invention relates to a heavy metal adsorbent, in particular to an adsorbent which can be used for treating waste water and a preparation method. Background technique [0002] With the development of industrialization, heavy metal pollution is becoming more and more serious. Heavy metal pollution is different from the pollution of other organic compounds. Many organic compounds can be purified physically, chemically or biologically in nature to reduce or eliminate their harmfulness. However, heavy metal pollution sources can be difficult to degrade for decades or even centuries. Heavy metal pollution is mainly pollution of water sources. After these polluted water sources enter the environment or ecosystem, they can be transferred, accumulated, and amplified through the food chain, thus bringing great harm to our lives. [0003] At present, the methods commonly used to treat wastewater containing heavy metals include flocculation, advanced oxidati...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C12P1/00C02F101/20
CPCB01J20/24B01J2220/4825B01J2220/4887C02F1/286C02F2101/20C12P1/00
Inventor 熊小芳
Owner 熊小芳
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