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Heavy metal repair and treatment material and preparation method thereof

A technology for the treatment of materials and heavy metals, applied in chemical instruments and methods, other chemical processes, adsorbed water/sewage treatment, etc., can solve the problems of high cost, large application dose, low repair efficiency, etc., and achieve low cost and low application dose. , the effect of reducing bioavailability

Pending Publication Date: 2022-04-29
四川津蜀生态科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Some treatment materials used in the prior art have shortcomings such as low repair efficiency, high cost, and large application dose. Therefore, although there are many heavy metal repair and treatment materials in the prior art, it is still necessary to continue to develop new high-efficiency adsorption treatment materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The heavy metal restoration and treatment material described in this embodiment has hydroxyl groups on the surface of minerals after dry modification, and grafted mercapto groups. The quantity of hydroxyl groups and mercapto groups has an important influence on the effect of heavy metal restoration. The heavy metal repair and treatment material of the present invention has both hydroxyl groups and mercapto groups, and has a more prominent adsorption capacity for heavy metals. Specifically, potassium feldspar and montmorillonite are used as raw materials to assist clay minerals. The main components of clay minerals are calcium carbonate and calcium magnesium carbonate. The modified heavy metal repair and treatment materials prepared by the techniques such as sticks. Wherein, the weight ratio of the potassium feldspar, montmorillonite, calcium magnesium carbonate, and calcium carbonate is 40:10:12:38. Potassium feldspar, calcium magnesium carbonate, calcium carbonate and...

Embodiment 2

[0051] This embodiment is the preparation embodiment of embodiment 1. Specifically, what this example describes is the preparation method of the heavy metal restoration treatment material, and the specific steps are as follows:

[0052] 1) Weigh the following mineral raw material powders: 40g of potassium feldspar, 10g of montmorillonite, 12g of calcium and magnesium carbonate, and 38g of calcium carbonate, and mix them uniformly to obtain a mixture. In the prior art, sodium carbonate is used as mineral raw material, but the use effect of sodium carbonate is poorer than calcium carbonate magnesium and calcium carbonate, and the main effects of calcium carbonate magnesium and calcium carbonate are at least reflected in the following two aspects, the first effect It is to create alkaline conditions after high-temperature calcination and spray water to provide necessary reaction conditions for silane hydrolysis; secondly, the pH is high, which can be used to properly adjust the p...

Embodiment 3

[0059] This embodiment is an application embodiment.

[0060] Prepare a series of cadmium nitrate solutions with a concentration of 5-50mg / L as the working solution, measure 50mL respectively into 100mL centrifuge tubes, weigh 0.05g of heavy metal restoration and treatment materials and add Cd 2+ In the centrifuge tube of the contaminated working solution, the weight-volume ratio of the heavy metal repair treatment material to the cadmium nitrate solution is 1g / L, shake at a constant temperature for 2 hours, take the supernatant after high-speed centrifugation, and measure the Cd in the solution with an atomic absorption spectrophotometer. 2+ Concentration, according to Cd in the working solution 2+ The concentration difference before and after the concentration is used to calculate the adsorption amount of the heavy metal remediation treatment material.

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Abstract

The invention discloses a heavy metal repair and treatment material and a preparation method thereof. The heavy metal repair and treatment material has hydroxyl on the surface of a mineral modified by a dry method and is grafted with sulfydryl; the preparation method comprises the following steps: weighing potassium feldspar, montmorillonite, calcium magnesium carbonate and calcium carbonate, and mixing; adding polyethylene glycol, grinding in a planetary ball mill, calcining at high temperature, and naturally cooling; h2O and mercaptopropyltrimethoxysilane are sequentially sprayed to the calcined material, extrusion is conducted through a roller press, air drying and smashing are conducted, and the heavy metal repairing and treating material is obtained. The heavy metal repair and treatment material has a good adsorption effect in a solution, can adsorb heavy metals through surface complexation reactions such as chemical adsorption, and has an excellent adsorption effect on heavy metal elements such as cadmium and mercury in the solution. The heavy metal remediation and treatment material has a good passivation effect on heavy metals in soil, can improve the pH of the soil, enhance the adsorption and fixation of the soil on the heavy metals and remarkably reduce the bioavailability of the soil, and can be used as an efficient passivation material for cadmium pollution of the acid soil.

Description

technical field [0001] The invention belongs to the field of heavy metal restoration, and relates to a heavy metal restoration treatment material and a preparation method of the material. Background technique [0002] Heavy metal pollution, especially heavy metal pollution in soil and water, will not only have a bad impact on the environment of the polluted area, but also endanger human health in the area, and even bring many safety hazards to the regional ecological environment. The overall situation of my country's cultivated land soil pollution is not optimistic, and local problems are prominent, especially heavy metal pollution, which has posed a serious threat to the quality and safety of agricultural products in a few areas. [0003] At present, the adsorption method commonly used in the treatment of heavy metal pollution in water, and the chemical passivation method used in the treatment of heavy metal pollution in farmland soil, the core technology is the research, d...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B09C1/00C02F1/28C02F101/20
CPCB01J20/12B01J20/043B01J20/22C02F1/288B09C1/00C02F2101/20
Inventor 孙璐
Owner 四川津蜀生态科技有限公司
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