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An application of using biphasic calcium phosphate to remove heavy metal lead in water

A biphasic calcium phosphate and heavy metal technology, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low removal efficiency and large amount of adsorbent, and achieve removal effect Good, high efficiency and stability, low environmental risk

Active Publication Date: 2020-10-27
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of the present invention has good lead removal effect, low environmental risk, simple operation, and low cost method for removing heavy metal lead in water by using biphasic calcium phosphate, which can overcome the relatively harsh preparation conditions of single-phase materials in the prior art; nano-adsorption in the environment The toxicity of nanomaterials caused by the small size effect of the material, and the problem of the large amount of adsorbent used in the adsorption and removal of heavy metal lead and the relative low removal efficiency

Method used

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  • An application of using biphasic calcium phosphate to remove heavy metal lead in water
  • An application of using biphasic calcium phosphate to remove heavy metal lead in water
  • An application of using biphasic calcium phosphate to remove heavy metal lead in water

Examples

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Effect test

Embodiment 1

[0034] Preparation of biphasic calcium phosphate HA / β-TCP:

[0035] Ca(NO 3 ) 2 . 4H 2 O solution and (NH 4 ) 2 HPO 4 The solution was mixed according to the calcium-phosphorus molar ratio of 1.6, and the pH of the mixed solution was maintained at 11.0 to form a precursor, which was dried at 80°C and calcined at 900°C for 4 hours to obtain biphasic calcium phosphate powder HA / β-TCP. The X-ray diffraction pattern of biphasic calcium phosphate HA / β-TCP is as follows figure 1 as shown, figure 1 It shows that the diffraction peaks of the generated materials can basically overlap with the corresponding diffraction peaks of HA and β-TCP, indicating that biphasic calcium phosphate HA / β-TCP has been successfully prepared, and the particle size of biphasic calcium phosphate is 1-3 μm.

Embodiment 2

[0037] Preparation of biphasic calcium phosphate α-TCP / β-TCP:

[0038] Ca(NO 3 ) 2 .4H 2 O solution and (NH 4 ) 2 HPO 4 The solution was mixed according to the calcium-phosphorus molar ratio of 1.5, and the pH of the mixed solution was maintained at 10.0 to form a precursor, which was dried at 80°C and calcined at 1120°C for 4 hours to obtain biphasic calcium phosphate powder α-TCP / β-TCP. The X-ray diffraction pattern of biphasic calcium phosphate α-TCP / β-TCP is as follows figure 2 as shown, figure 2 It shows that the diffraction peaks of the generated materials can basically overlap with the corresponding diffraction peaks of α-TCP and β-TCP, indicating that biphasic calcium phosphate α-TCP / β-TCP has been successfully prepared, and the particle size of biphasic calcium phosphate is 1-3 μm.

Embodiment 3

[0040] Preparation of biphasic calcium phosphate HA / β-TCP:

[0041] Ca(NO 3 ) 2 .4H 2 O solution and (NH 4 ) 2 HPO 4 The solution was mixed according to the calcium-phosphorus molar ratio of 1.5, and the pH of the mixed solution was maintained at 11.0 to generate a precursor, which was dried at 80°C and calcined at 1100°C for 3 hours to obtain biphasic calcium phosphate powder HA / β-TCP.

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Abstract

The invention discloses application of utilizing biphasic calcium phosphate to remove heavy metal lead in water. According to the application, the biphasic calcium phosphate is added into lead-containing wastewater, the biphasic calcium phosphate and lead ions can generate dissolving-precipitation reaction, the lead ions can be converted into hydroxyl lead phosphate with extremely low solubility to be precipitated, and precipitate is filtered to be separated from a water body. In a water body with pH5 and a lead pollution concentration of 500mg / L, the use amount of the biphasic calcium phosphate is 1.0g / L, and a lead removal rate can reach 99.9%. According to the application, the biphasic calcium phosphate material is utilized, and the lead ions are converted into insoluble lead precipitate; thus, the efficiency is high and stable, good precipitation performance is achieved, and cost is low. The biphasic calcium phosphate material is generally a byproduct of preparing single-phase hydroxylapatite and further has the advantages of controllable ion release, small environmental risk and no secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of heavy metal-polluted water body treatment, and in particular relates to an application of using biphasic calcium phosphate to remove heavy metal lead in water. Background technique [0002] The pollution form of heavy metal lead in the environment is severe, and its sources are mainly in industrial production such as mining, smelting, lead battery manufacturing, pesticides, paints, and residents' lives. The discharge standard for lead in the first category of pollutants is 1 mg / L. However, a large amount of lead-contaminated wastewater is discharged every year, and the treatment cannot be guaranteed to meet the discharge standards, causing damage to the local ecological environment. In some areas, the blood lead of residents exceeds the standard and health is damaged. Lead is a non-essential element for humans, and it causes more serious pollution problems than other heavy metal elements. Precipitation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62
CPCC02F1/62
Inventor 魏正贵贺凤至祁晶晶张宇崔静张驰谢毅梁蒋玉颖
Owner NANJING NORMAL UNIVERSITY
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