Sepiolite composite material loading nanocarbon hydroxyapatite as well as preparation method and application ofsepiolite composite material

A technology of carbon hydroxyapatite and composite materials, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of reducing the adsorption efficiency of heavy metal ions, eutrophication of water bodies, and loss of reactivity To prevent dissolution and phosphorus loss, avoid eutrophication, and avoid agglomeration

Inactive Publication Date: 2019-05-17
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are significant defects when the above-mentioned carbon hydroxyapatite is used as an adsorbent.
On the one hand, as a phosphorus-containing material, nano-scale carbon hydroxyapatite has high solubility and is easy to release phosphate radicals when used in water bodies, so it is easy to bring the risk of eutrophication in water bodies in practical applications, so it is not suitable for direct Applied to the restoration of water bodies or sediments; on the other hand, as a nanomaterial, nano-carbon hydroxyapatite has a large specific surface area and extremely high surface activity, and it is very solution-agglomerated in the solution to form micron-scale, large-sized agglomerates body, loss of reactivity, thereby reducing the adsorption efficiency of heavy metal ions

Method used

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  • Sepiolite composite material loading nanocarbon hydroxyapatite as well as preparation method and application ofsepiolite composite material
  • Sepiolite composite material loading nanocarbon hydroxyapatite as well as preparation method and application ofsepiolite composite material
  • Sepiolite composite material loading nanocarbon hydroxyapatite as well as preparation method and application ofsepiolite composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 100-mesh sepiolite powder into 0.1mol / L diamine hydrogen phosphate solution at a solid-to-liquid ratio of 1g:5mL, and add 0.167mol / L L of calcium hydroxide solution, mixed with the above solution, and added potassium hydroxide to maintain the pH value higher than 10, after 45 minutes of reaction, solid-liquid separation, the obtained solid was washed 3-5 times with deionized water, and the load was obtained after freeze-drying Sepiolite composites of nanocarbon hydroxyapatite.

Embodiment 2

[0031] Add 100-mesh sepiolite powder into 0.835 mol / L calcium nitrate solution at a solid-to-liquid ratio of 1g:10mL, and add 0.5 mol / L of Diammonium hydrogen phosphate solution, mix with the above solution, and add ammonia solution to maintain the pH value higher than 10, react for 30 minutes, separate solid and liquid, wash the obtained solid with deionized water 3-5 times, and obtain loaded nano-carbon after freeze-drying Sepiolite composites of hydroxyapatite.

[0032] Scanning electron microscopy is used to scan the sepiolite powder and the sepiolite composite material loaded with nano-carbon hydroxyapatite, and the SEM pattern is as follows figure 1 shown. in, figure 1 A is the SEM image of sepiolite, figure 1 B corresponds to the sepiolite composite material loaded with nano-carbon hydroxyapatite prepared in Example 2. It can be seen from the figure that nanoparticles with a particle size of less than 100 nm (indicated by the arrow) are loaded on the fibrous sepiolit...

Embodiment 3

[0036]Add 300-mesh sepiolite powder into 1.67 mol / L calcium chloride solution at a solid-to-liquid ratio of 1g:10mL, and add 1.0mol / L Diammonium hydrogen phosphate solution, mixed with the above solution, and added sodium hydroxide to maintain the pH value higher than 10, after 30 minutes of reaction, solid-liquid separation, the obtained solid was washed 3-5 times with deionized water, and the load was obtained after freeze-drying Sepiolite composites of nanocarbon hydroxyapatite.

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Abstract

The invention discloses a sepiolite composite material loading nanocarbon hydroxyapatite as well as preparation method and application ofthesepiolite composite material. The composite material is prepared from sepiolite and nanocarbon hydroxyapatite, wherein nanocarbon hydroxyapatite is loaded on sepiolite. The preparation method comprises the steps that sepiolite powder is added into a calcium-based (phosphorus-based) solution to be sufficiently mixed, a phosphorus-based (calcium-based) solution is added then, the pH value is conditioned so that precipitation can occur to generate nanocarbonhydroxyapatite which is loaded on sepiolite, and thus the sepiolite composite material loading nanocarbon hydroxyapatite is obtained. The composite material makes nanocarbon hydroxyapatite be loaded on the surface of sepiolite, agglomeration of nanocarbon hydroxyapatite is avoided, and the superior adsorption ability of nanocarbon hydroxyapatite to heavy metal is maintained; the stability of the sepiolite composite material is enhanced, and the risks of phosphorus loss and eutrophication are avoided; the prepared material can be applied to adsorption and fixation of heavy metal elements such as lead and cadmium in water and bottom mud, and has application prospects in the field of water purification.

Description

technical field [0001] The invention specifically relates to a sepiolite composite material loaded with nano-carbon hydroxyapatite, a preparation method thereof, and an application in removing heavy metal pollutants lead and cadmium from sediment and water. Background technique [0002] In recent years, the pollution caused by heavy metal elements such as lead and cadmium entering the environment has attracted widespread attention. Heavy metal pollutants such as lead and cadmium have the characteristics of high toxicity, persistence and refractory degradation, which not only affect the quality of the environment, but also easily enter the human body through the food chain, seriously endangering human health. Therefore, the remediation of water bodies polluted by heavy metals such as lead and cadmium is a research hotspot in the field of environmental remediation. [0003] At present, the use of nano-apatite phosphorus-containing materials to adsorb and fix heavy metal ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/20
Inventor 魏巍李林源韩睿明李时银王国祥
Owner NANJING NORMAL UNIVERSITY
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