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Preparation method and application of multi-site activated and modified reed-lutarioriparius biochar

A biochar, modified technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problem of no heavy metal verification, and achieve the effects of low production cost, wide source, and comprehensive utilization.

Active Publication Date: 2019-10-15
JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent application number CN 109401755 A discloses a straw biochar modification method for remediation of heavy metal-contaminated soil, modified with 30% sodium hydroxide, which has a relatively good repair effect on effective zinc and cadmium; patent application number CN 108940203 A discloses a preparation method and application of biochar for vegetation suitable for the Three Gorges, using NaOH and H 2 o 2 Combined modified approach to NH 4 +-N ions have a strong adsorption force and have not been verified for heavy metals

Method used

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  • Preparation method and application of multi-site activated and modified reed-lutarioriparius biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example Compared with the reed-Nandi biomass biochar not subjected to activation modification, the adsorption of activated modified biochar on zinc and cadmium in solution was analyzed.

[0033] The biochar preparation steps are as follows:

[0034] 1) Wash, dry and pulverize the soaked reed-Nandi biomass, add it to the water manganese ore powder solution, immerse it in the water manganese ore powder solution, and carry out the low-temperature hydrothermal carbonization. The hydrothermal carbonization temperature is 180 degrees Celsius, and the hydrothermal carbonization time is 15 hours. , to make unactivated and modified biochar;

[0035] 2) Add 100 grams of unactivated and modified biochar into 1 liter of calcium chloride-hydrogen peroxide mixture and soak for 24 hours; the preparation method of calcium chloride-hydrogen peroxide mixture is as follows: take 500ml of pure Add water and 500ml hydrogen peroxide into the container, then add 50 grams of calcium chloride,...

Embodiment 2

[0040] Compared with the reed-Nandi biomass biochar that has not been activated and modified, the adsorption of activated modified biochar on the available zinc and cadmium in acidic red soil in Guixi, Jiangxi was analyzed, and the biochar preparation steps were the same as in Example 1.

[0041] The unactivated modified biochar and activated modified biochar were added to the zinc and cadmium contaminated soil in Guixi, Jiangxi at a mass ratio of 1% (the soil pH value was 4.83, the total cadmium in the soil was 2.53PPM, and the total zinc was 80.81PPM) , fully mixed, and after 4 months of natural aging, the bioremediation of heavy metal pollution in the soil was completed. Using 0.01moL of CaCl 2 The solution was used to extract the available Cd in the soil, and then its concentration was measured by graphite furnace atomic absorption spectrometer. The results are shown in Table 1 (cadmium) and Table 2 (zinc).

[0042] before aging after aging repair rate ...

Embodiment 3

[0045] Compared with the reed-Nandi biomass biochar that has not been activated and modified, the adsorption of activated modified biochar on the available zinc and cadmium in the soil of Renhua, Guangdong was analyzed. The biochar preparation steps were the same as in Example 1.

[0046] The unactivated modified biochar and the activated modified biochar were added to the zinc and cadmium contaminated soil in Renhua, Guangdong at a mass ratio of 1% (the soil pH value was 5.52, the total cadmium in the soil was 3.93PPM, and the total zinc in the soil was 1160.37PPM). Mix well, and after 4 months of natural aging, the bioremediation of heavy metal pollution in the soil is completed. Using 0.01moL of CaCl 2 The available Cd in the soil was extracted by the solution, and then its concentration was measured by graphite furnace atomic absorption spectrometer. The results are shown in Table 3 (cadmium) and Table 4 (zinc):

[0047] before aging after aging repair rat...

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Abstract

The invention relates to the field of treatment to heavy metal pollution in water and soil, in particular to a preparation method of multi-site activated and modified reed-lutarioriparius biochar andapplication thereof to removal of heavy metals zinc and cadmium. The preparation method comprises the following steps: firstly washing, drying and crushing reed-lutarioriparius biomass, ultrasonicallystirring in an aqueous manganese ore powder solution thoroughly, then performing low-temperature hydrothermal carbonization to produce unactivated and unmodified biochar, then soaking the biochar ina calcium chloride-hydrogen peroxide mixed solution, activating a biochar-calcium chloride-hydrogen peroxide mixed solution by using microwave, and then modifying the dried biochar through ultravioletradiation to obtain activated and modified biochar, wherein the obtained biochar is applied to the removal of the heavy metals zinc and cadmium in the water and the soil. An application method comprises the following steps: adding the activated and modified biochar into heavy metal zinc and cadmium wastewater for an adsorption reaction; or directly adding into heavy metal zinc and cadmium contaminated soil, thoroughly mixing uniformly, and aging for a period of time to complete bioremediation of heavy metal zinc and cadmium pollution in the soil.

Description

technical field [0001] The invention relates to the field of heavy metal pollution treatment in water bodies and soils, in particular to a preparation method of multi-position activated and modified reed-Nandi biochar and its application for removing heavy metal zinc and cadmium. Background technique [0002] Jiangxi has a subtropical monsoon climate. The soil belongs to red soil. The red soil itself has the characteristics of high development and strong leaching. Coupled with the unreasonable development and utilization of red soil resources, red soil acidification is relatively common. At the same time, it is affected by the five river basins in the upper reaches of Poyang Lake. Due to the impact of mining, smelting, and industrial "three wastes", heavy metal pollution in farmland soil and farmland irrigation water in some areas is relatively serious, especially heavy metal zinc and cadmium pollution. Since zinc and cadmium can be enriched in organisms and enter the human ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28B09C1/00C02F101/20C02F101/10
CPCB01J20/20B01J2220/4843B09C1/00B09C1/007C02F1/283C02F2101/10C02F2101/20
Inventor 辛在军吴永明姚忠邓觅游海林
Owner JIANGXI ACADEMY OF SCI
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