US 2017/0282229 A1 · IRON-BASED BIOCHAR MATERIAL, PREPARATION THEREFOR AND USE THEREOF IN SOIL POLLUTION CONTROL

Abstract

The present invention belongs to the technical field of soil heavy metal remediation, specifically discloses a method for preparing the iron-based biochar material, the iron-based biochar material prepared there from and a method for controlling the heavy metal pollution in soil using the iron-based biochar material. For the iron-based biochar material of the present invention, by using a method of high-temperature carbonization, a biomass is used as a raw material and an iron-containing compound is add in the process of preparing biochar, wherein iron is incorporated in a specific ratio, to form the iron-based biochar material with a special structure and function. The material has a simple preparation process, low cost and a short production period; the prepared iron-based biochar material has an unique effect on the arsenic-cadmium combined pollution soil remediation, can effectively reduce the bioavailability of arsenic and cadmium in the soil, significantly reduces the arsenic and cadmium contents in the agricultural products planted in the arsenic-cadmium combined pollution soil, and has no toxic and side effects on the crops, is safe to apply and can be applied to the control of arsenic-cadmium combined pollution soil in a large scale.

Claims13

Dependent claims

A process for preparing the iron-based biochar material, comprising the steps of:

(1) preparing a biochar material:
drying in the air and crushing a biomass material, increasing the temperature to 30° C. to 80° C., keeping the temperature for 3 to 12 hours, and stopping heating;
(2) preparing a mixture of iron and biochar:
adding an iron-containing compound to the biochar material prepared in step (1) to obtain a mixture of iron and biochar, wherein the mass percentage of carbon to iron is 9-50:1, stirring and reacting the mixture;
(3) activating the biochar material:
adding a reducing agent solution with a mass percentage of 0.01-10% into the mixture prepared in step (2), and stirring and reacting the mixture for 2-6 hours;
(4) preparation of iron-based biochar material:
adding an emulsifier solution to the activated biochar material prepared in step (3), stirring and reacting the mixture for 2 to 6 hours at 300 to 80° C., followed by cooling, drying in the air and crushing, to obtain the iron-based biochar material.

5 more elements

Dependencies are inferred from the claim text.

Iron-based biochar material, preparation therefor and use thereof in soil pollution control

Life of this patent

Iron-based biochar material, preparation therefor and use thereof in soil pollution control

Life of this patent

Abstract

Claims13