Process for preparing heavy metal adsorbent by waste plants

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...

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