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Method for preparing modified biomass charcoal for passivating lead and cadmium in soil and modified biomass charcoal

A technology of biochar and biomass raw materials, which is applied in the direction of chemical instruments and methods, soil conditioning materials, fertilizer mixtures, etc., can solve the problems of destroying the structure of biochar, large amount of biochar, and easily corroded equipment, etc., and achieve improvement Environmental benefits, high passivation strength, and the effect of reducing repair costs

Inactive Publication Date: 2016-11-16
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problems of the large amount of biochar used in the current treatment of heavy metals in farmland, and the destruction of the biochar structure, the high temperature required, and the corrosive equipment that existed in the previous acid-base modification methods. , proposed a method for the preparation of modified biochar that passivates soil heavy metal lead and cadmium with significant passivation effect and low cost, and the modified biochar prepared by this method

Method used

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  • Method for preparing modified biomass charcoal for passivating lead and cadmium in soil and modified biomass charcoal
  • Method for preparing modified biomass charcoal for passivating lead and cadmium in soil and modified biomass charcoal
  • Method for preparing modified biomass charcoal for passivating lead and cadmium in soil and modified biomass charcoal

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Effect test

Embodiment 1

[0030] 1. Preparation of modified biomass charcoal, see the process figure 1 : After collecting and air-drying the wheat stalks, crush them and pass through a 20-mesh sieve for use. Take FeSO according to the ratio of the amount of material 3: 1 4 ·7H 2 O and KMnO 4 Dissolve in water to form solution one and solution two respectively. After the solution one and the solution two are evenly mixed, the pH is adjusted to 7 with a potassium hydroxide solution with a concentration of 1 mol / L, and stirring is continued until the reaction is fully obtained to obtain an iron manganese oxide suspension. Add the crushed and sieved wheat straw to the iron-manganese oxide suspension (the mass ratio of wheat straw to iron-manganese oxide is 20:1), stir well, soak for 24 hours, and put it in an oven for drying at 105°C 6h to obtain wheat straw loaded with iron and manganese oxides. Put the iron-manganese oxide-loaded wheat straw into a stainless steel tank with a diameter of 10cm and a height...

Embodiment 2

[0037] After the wheat straw is collected and air-dried, it is crushed and passed through a 60-mesh sieve for use. Take FeSO according to the ratio of the amount of material 2:1 4 ·7H 2 O and KMnO 4 Dissolve in water to form solution one and solution two respectively. After the solution one and the solution two are evenly mixed, the pH is adjusted to 7 with a potassium hydroxide solution with a concentration of 1 mol / L, and stirring is continued until the reaction is fully obtained to obtain an iron manganese oxide suspension. Add the crushed and sieved wheat straw to the iron-manganese oxide suspension (the mass ratio of wheat straw to iron-manganese oxide is 30:1), stir well, soak for 24 hours, and put it in an oven for drying at 90°C 7h to obtain wheat straw loaded with iron and manganese oxides. Put the iron-manganese oxide-loaded wheat straw into a stainless steel tank with a diameter of 10cm and a height of 15cm, compact it, and then put it in a muffle furnace under oxyge...

Embodiment 3

[0039] After the wheat straw is collected and air-dried, it is crushed and passed through a 100-mesh sieve for use. Take FeSO according to the ratio of the amount of material 5:1 4 ·7H 2 O and KMnO 4 Dissolve in water to form solution one and solution two respectively. After the solution one and the solution two are evenly mixed, the pH is adjusted to 7 with a potassium hydroxide solution with a concentration of 1 mol / L, and stirring is continued until the reaction is fully obtained to obtain an iron manganese oxide suspension. Add the crushed and sieved wheat straw to the iron-manganese oxide suspension (the mass ratio of wheat straw to iron-manganese oxide is 40:1), stir well, soak for 24 hours, and put it in an oven at 120°C for drying 5h to obtain wheat straw loaded with iron and manganese oxides. Put the iron-manganese oxide-loaded wheat straw into a stainless steel tank with a diameter of 10 cm and a height of 15 cm, compact it, and then put it in a muffle furnace under o...

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Abstract

The invention relates to a method for preparing modified biomass charcoal for passivating lead and cadmium in soil. The method comprises the following steps: A, grinding and screening biomass raw materials; B, respectively dissolving FeSO4.7H2O and KMnO4 in water, uniformly mixing, regulating the pH value to 7, thus obtaining iron and manganese oxide suspension; C, adding the ground biomass raw materials into the iron and manganese oxide suspension, uniformly stirring, soaking, drying at the temperature of 105 DEG C for 6 hours, thus obtaining a biomass material loaded with iron and manganese oxides; and D, adding the biomass material loaded with iron and manganese oxides into a reactor, raising the temperature to 450-650 DEG C under oxygen-limited conditions, carrying out a pyrolysis carbonization reaction, thus obtaining the modified biomass charcoal. According to the method disclosed by the invention, the iron and manganese oxides are distributed in the surface and pores of the biomass charcoal, a passivation effect of the biomass charcoal on heavy metals lead and cadmium can be obviously improved, the environmental benefits of the biomass charcoal for treating contaminated soil are effectively improved, and the remediation cost of heavy metal contaminated soil also can be effectively reduced.

Description

Technical field [0001] The present invention belongs to the technical field of biomass carbon modification technology, and relates to a method for passivating heavy metal lead and cadmium in soil and reducing the content of heavy metal lead and cadmium in plants, in particular to a modification of passivating soil lead and cadmium Preparation method of biochar and modified biochar. Background technique [0002] According to the applicant’s understanding, lead is a naturally occurring element with a range of 2~300mg·kg in the earth’s crust. -1 , The average abundance is 35mg·kg -1 . The soil lead content in China can reach as high as 1143mg / kg and the cadmium content can reach as high as 20mg / kg. The annual reduction of grain production due to soil pollution is more than 10 million tons, resulting in various agricultural economic losses of up to 20 billion yuan. At present, there are two main ways to control soil heavy metal pollution: one is to change the form of heavy metals in...

Claims

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Application Information

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IPC IPC(8): C05G3/04C01B31/02C09K17/02C09K101/00C05G3/80
CPCC05D1/00C05G3/80C09K17/02C09K2101/00
Inventor 李恋卿李瑞月潘根兴卞荣军张旭辉刘晓雨郑金伟郑聚锋程琨
Owner NANJING AGRICULTURAL UNIVERSITY
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