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Hydroxyl calcium phosphate-active carbon composite material and application thereof

A technology of calcium hydroxyphosphate and composite materials, which is applied in the field of calcium hydroxyphosphate-activated carbon composite materials, can solve the problems of poor adsorption stability and inefficient use of materials, and achieve remarkable effects, low repair costs, and low preparation prices

Inactive Publication Date: 2015-07-15
HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that materials cannot be efficiently used when remediating heavy metal-contaminated soil and water bodies with this method.
At the same time, because its principle of action is mainly hydration reaction and adsorption, there is a risk of redissolution of heavy metals after long-term weathering and acid rain leaching
Although the adsorption method can achieve the purpose of selectively removing pollutants based on the huge specific surface area, dense pore structure on the adsorbent, or various chemical bonds formed between various active groups on the adsorbent and the adsorbate. , but there is a problem of poor adsorption stability

Method used

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  • Hydroxyl calcium phosphate-active carbon composite material and application thereof
  • Hydroxyl calcium phosphate-active carbon composite material and application thereof
  • Hydroxyl calcium phosphate-active carbon composite material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Preparation of calcium hydroxyphosphate-activated carbon composite material described in the present invention. In this embodiment, activated carbon is used as a carrier, and calcium hydroxyphosphate is compounded with activated carbon particles during the stirring process through the chemical reaction of calcium oxide, phosphoric acid solution and alkali solution. The specific implementation process is: 1) According to the molar ratio of calcium oxide: phosphoric acid = 5: 3, calcium oxide is added to the phosphoric acid solution suspended by activated carbon, and the reaction is stirred for 2 hours; 2) After that, the pH of the solution is adjusted to 8 with lye Between ~9, continue stirring to compound calcium hydroxyphosphate and activated carbon. After completion, place the prepared material at room temperature for at least 8 hours for aging; 3) Finally, wash the prepared material and centrifuge it. Dry at 60°C for 8 hours, and grind the dried material...

Embodiment 2

[0027] Example 2: Conservation test of calcium hydroxyphosphate-activated carbon composite material in the present invention on soil polluted with different moisture content. The lead and cadmium contaminated soil of a mine was selected as the contaminated soil sample of this experiment, and the concentrations of lead and cadmium in the tested soil were 1600mg·kg -1 , 40mg·kg -1 . During the experiment, 100g of lead-cadmium-contaminated soil was weighed, 3g of the above-mentioned composite material was added, and an appropriate amount of tap water was added according to the moisture content in the soil of 26.6%, 31.6%, 41.6%, 51.6% and 61.6%, and stirred until uniform. sampling. Determination of the leaching concentration of lead and cadmium in soil (TCLP method). Such as figure 1 As shown, after testing, the fixation rate of exchangeable lead in the soil after 15 days was 98%, and the fixation rate of exchangeable cadmium was 72%.

Embodiment 3

[0028] Example 3: Conservation test of contaminated soil with different additions of calcium hydroxyphosphate-activated carbon composite materials described in the present invention. The lead and cadmium contaminated soil of a mine was selected as the contaminated soil sample of this experiment, and the concentrations of lead and cadmium in the tested soil were 1600mg·kg -1 , 40mg·kg -1 . During the experiment, 100g of lead-cadmium-contaminated soil was weighed, 1g, 3g, and 5g of the above-mentioned composite materials were added respectively, and an appropriate amount of tap water was added according to the moisture content of the soil at 41.6%, stirred until uniform, and samples were taken in 15 days. Determination of the leaching concentration of lead and cadmium in soil (TCLP method). Such as figure 2 As shown, after testing, the fixation rate of exchangeable lead in the soil after 15 days was 98%, and the fixation rate of exchangeable cadmium was 72%.

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Abstract

The invention discloses a hydroxyl calcium phosphate-active carbon composite material and application thereof. The composite material comprises active carbon and hydroxyl calcium phosphate in a mol ratio of 24-36: 1. The preparation method comprises the following steps: (1) adding calcium oxide or calcium hydrate into a phosphoric acid solution where active carbon suspends and carrying out a reaction under stirring, wherein a mol ratio of phosphoric acid to calcium oxide or calcium hydrate is 3: 4.8-5.2; (2) adjusting the pH value of a solution obtained in the step (1) to 8-9, carrying out stirring and carrying out standing for aging; and (3) subjecting the solution to solid-liquid separation and carrying out drying and levigation so as to obtain the composite material. The composite material has a substantial treatment effect on lead and cadmium pollution; selected raw materials do not contain substances posing pollution to the environment; and the composite material has low preparation cost and restoration cost.

Description

technical field [0001] The invention relates to a calcium hydroxyphosphate-activated carbon composite material and an application thereof, belonging to the field of heavy metal pollution control. Background technique [0002] With the vigorous development of the economy, the growth of the population and the acceleration of the urbanization process, the problem of environmental pollution is becoming more and more serious. Soil, air, water, noise and other pollution have seriously threatened the survival of human beings. Among them, heavy metal pollution incidents are one of the typical environmental problems. In particular, the problem of heavy metal pollution in soil and water is becoming more and more apparent. The polluted area is increasing year by year, which has seriously threatened to the healthy development of humans and other organisms. [0003] At present, the methods for dealing with heavy metals mainly include: solidification and stabilization method, rinsing met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 贺前锋陈四海刘代欢陈宪刘烨煊刘畅周虹
Owner HUNAN YONKER ENVIRONMENTAL PROTECTION RES INST
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