Preparation method of cystamine-modified biochar for adsorbing heavy metal cadmium ions

A technology for adsorbing heavy metals and biochar, which is applied in the field of preparation of cystamine-modified biochar, can solve the problems of weak specific adsorption capacity and poor specific function of heavy metals, and achieve simple preparation method, high loading capacity and improved capacity Effect

Active Publication Date: 2019-04-30
SHANDONG AGRICULTURAL UNIVERSITY
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Problems solved by technology

[0004] As a broad-spectrum adsorption material, traditional biochar has poor specificity, especially for heavy metals.

Method used

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  • Preparation method of cystamine-modified biochar for adsorbing heavy metal cadmium ions
  • Preparation method of cystamine-modified biochar for adsorbing heavy metal cadmium ions
  • Preparation method of cystamine-modified biochar for adsorbing heavy metal cadmium ions

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Embodiment Construction

[0023] In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementation modes.

[0024] A method for preparing cystamine-modified biochar that absorbs heavy metal cadmium ions. The preparation method includes the following steps: in the following method, rice husk biochar is used as an example for preparation of biochar.

[0025] Step (a), activate biochar; add a certain amount of rice husk biochar with a concentration of 1~5 mol L -1 In the potassium hydroxide aqueous solution, ensure that the mass ratio of the rice husk biochar to the potassium hydroxide aqueous solution is 1:5-10, stir at 120-180 rpm and stir for 1-3 h, filter to remove the surface impurities of the rice husk biochar, and use Wash with deionized water until the pH is neutral, dry in a vacuum oven at 75°C for 24 h;

[0026] Step (b), cystamine modified activated biochar; take 5g of activated rice husk biochar prepared in step (a), ad...

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Abstract

The invention relates to a preparation method of cystamine modified charcoal for adsorbing heavy metal cadmium ions. The preparation method comprises the following steps of: S(a), activating charcoal; S(b), modifying the activated charcoal by cystamine. According to the preparation method disclosed by the invention, the charcoal is used as a carrier, glutaraldehyde is used as a cross-linking agent, the cystamine is modified to the surface of the charcoal so as to introduce a great quantity of active groups (sulfydryl, aldehyde, amino and imido group) to the surface of the charcoal, and the active groups can improve adsorption of the charcoal for heavy metals and particularly cadmium ions by a coordination effect and an electrostatic effect.

Description

technical field [0001] The invention relates to the technical field of heavy metal ion adsorption, in particular to a preparation method of cystamine-modified biochar that absorbs heavy metal cadmium ions. Background technique [0002] Soil heavy metal pollution has brought prominent ecological environment and food safety problems, and has received widespread attention. Heavy metals accumulate in the soil, causing soil degradation and lower crop yield and quality. Heavy metals cannot be biodegraded, can accumulate in plants, and enrich human and animal bodies through the food chain, posing a threat to human and animal health. [0003] Traditional heavy metal-contaminated soil remediation technologies, such as thermal desorption technology, soil leaching, electric remediation technology, chemical fixation, etc., have problems such as high cost and easy to cause secondary pollution. As a new type of adsorbent, biochar has good adsorption performance due to its wide source, l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30B09C1/00
CPCB01J20/20B01J20/22B09C1/00
Inventor 陈荣琪魏珉王秀峰周鑫朱晨
Owner SHANDONG AGRICULTURAL UNIVERSITY
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