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Method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal, and applications thereof

A magnetic biochar and biochar technology, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as poor connection stability, achieve retention of adsorption characteristics, Excellent cadmium recovery effect and increased recyclability

Inactive Publication Date: 2020-05-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods have limitations to varying degrees. The impregnation method relies on the physical adsorption between the magnetic particles and the biomass to form a connection with poor stability.

Method used

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  • Method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal, and applications thereof
  • Method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal, and applications thereof
  • Method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Biomass carbon materials, according to the following steps:

[0045] Step 1, washing the naturally dried wheat straw with water for 4 times, air-drying for 2 days, pulverizing with a pulverizer, and placing it in a drying container;

[0046] Step 2, take the wheat straw powder obtained in step 1, compact it, and cover the crucible; place it in a muffle furnace, raise the temperature to 400°C at a heating rate of 20°C / min, then carbonize for 4 hours, and cool down to Take out after room temperature;

[0047] Step 3, grinding the biochar obtained in step 2 through an 80-mesh sieve to obtain a biochar material (referred to as BC);

[0048] Step 4, prepare biochar material suspension (4.64g biochar, 300ml deionized water), mix with ferrous sulfate, ferric sulfate solution (2g ferrous sulfate, 5.4g ferric sulfate, 200ml deionized water), use Stir with a magnetic stirrer at a constant speed, then add sodium hydroxide solution therein to adjust the pH of the reaction system ...

Embodiment 2

[0054] The difference between this embodiment and Example 1 is: the added mass (gram) of the raw material is biomass charcoal: ferrous sulfate: ferric sulfate=4.64:4:10.8, and the obtained magnetic biomass charcoal is denoted as MBC2;

[0055] The initial concentration of cadmium solution is 11.11mg / L, the concentration of cadmium after adsorption equilibrium is 1.44mg / L, the removal rate is 64.35%, and the adsorption capacity is 14.3mg g -1 , the total separation time is 10-15s.

Embodiment 3

[0057] The difference between this embodiment and embodiment 1 is:

[0058] The added mass (gram) of the raw material is biomass charcoal: ferrous sulfate: ferric sulfate=2.32:4:10.8, and the gained magnetic biomass charcoal is denoted as MBC3;

[0059] The initial concentration of cadmium solution is 11.11mg / L, the concentration of cadmium after adsorption equilibrium is 3.96mg / L, the removal rate is 63.74%, and the adsorption capacity is 14.2mg g -1 , the total separation time is 8-10s.

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Abstract

The invention discloses a method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal. The method comprises the following steps: preparing a biomass charcoal material, andthen mixing the suspension of the biomass charcoal material, an aqueous solution of ferrous sulfate and an aqueous solution of ferric sulfate according to a mass ratio of (4-5):(3.5-4.5):(10-11); then adding a sodium hydroxide solution to adjust the pH value of the reaction system to 10, ageing, cleaning, and drying to obtain magnetic biomass charcoal; and adding the magnetic biomass charcoal into cadmium-containing wastewater, carrying out constant-temperature oscillation and adsorption equilibrium, taking out a centrifugal tube, adsorbing the magnetic biomass charcoal by using a magnet, andcarrying out solid-liquid separation. According to the invention, the adsorption characteristic of the biomass charcoal is retained, and the recyclability of solid-liquid separation is enhanced.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing heavy metal cadmium in wastewater by using magnetic biomass charcoal and an application thereof. Background technique [0002] Heavy metal cadmium pollution in water is one of the major water environment problems China is currently facing. The development of factories and the acceleration of urban modernization have resulted in a large amount of heavy metal ions in industrial wastewater. If discharged without treatment, soil and rivers will be polluted by heavy metals. Water bodies and soil The organisms in the cadmium are harmed, and after people eat it, cadmium will accumulate in the body, causing kidney damage, which in turn leads to softening of the bones and pain throughout the body, which is called "itai disease". As a country with a large population, the safety of agricultural products is very important in China, so the removal of cadmium...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F9/12B01J20/28B01J20/20B01J20/30C02F101/20
CPCB01J20/06B01J20/20B01J20/28009B01J2220/42B01J2220/4806B01J2220/4825C02F1/281C02F1/283C02F1/488C02F2101/20
Inventor 迟杰杜伟
Owner TIANJIN UNIV
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