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A kind of hydroxyapatite-supported nano zero-valent iron composite material and its preparation and application method

A nano-zero-valent iron and hydroxyapatite technology, which is applied in chemical instruments and methods, other chemical processes, and the restoration of polluted soils, can solve the problems of complex heavy metal pollution, such as difficulty in simultaneous detoxification, and achieves mild experimental operating conditions. Low preparation cost and good adsorption effect

Active Publication Date: 2021-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing materials are difficult to detoxify complex heavy metal pollution synchronously, and proposes to provide a method that can efficiently reduce hexavalent chromium and simultaneously fix and adsorb divalent metal cations through the regulation of phosphoric acid groups, hydroxyl groups, iron groups and other groups. Copper, cobalt, nickel hydroxyapatite-loaded nano-zero-valent iron composite material and its preparation method, and its application in the field of complex heavy metal polluted wastewater treatment and soil remediation

Method used

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  • A kind of hydroxyapatite-supported nano zero-valent iron composite material and its preparation and application method
  • A kind of hydroxyapatite-supported nano zero-valent iron composite material and its preparation and application method
  • A kind of hydroxyapatite-supported nano zero-valent iron composite material and its preparation and application method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepare 30mL of 0.5mol / L calcium hydroxide solution and 30mL of 0.3mol / L ammonium dihydrogen phosphate solution (the amount of Ca / P substance=1.67), and drop the prepared ammonium dihydrogen phosphate solution at a speed of 2.5mL / min Put it into the calcium hydroxide suspension, after ultrasonication for 20 minutes, adjust the pH to 10.5 with 50% ammonia water, then transfer to a 100mL polytetrafluoroethylene liner, and react for 10 hours at a hydrothermal temperature of 180°C , after cooling, filter with suction, wash and dry to obtain nanorod-shaped hydroxyapatite. Add 2.0g of hydroxyapatite to 5g / L of polyvinylpyrrolidone (PVP) solution, keep stirring on a magnetic stirrer, and feed nitrogen for 30min, then add 0.36mol / L of ferrous sulfate With a volume of 100mL, after fully absorbing ferrous ions for 3 hours, slowly drop 1.4mol / L potassium borohydride solution into the reaction system at a rate of 1.7mL / min, and continue stirring with nitrogen gas for 1.5h. Then wa...

Embodiment 2

[0048] By varying the material ratio of calcium source and phosphorus source, ie, Ca / P, the composition of the synthesized hydroxyapatite (HAP) undergoes certain changes. HAP was synthesized under the three ratios, and all had the characteristic peaks of hydroxyapatite, but the peak intensities were changed. With the change of Ca / P ratio, HAP will form certain structural defects, which will affect the stability and purity. When the Ca / P ratio is low, the system composition and crystallinity will change, and the characteristic peak of calcium hydroxide will appear around 18°. When Ca / P=2, within the range of 30-35° of its characteristic peak, it changes from 4 peaks to 3 peaks, one shoulder peak disappears, and merges with another characteristic peak to form a peak, and the characteristic peak of calcium hydroxide The peak did not appear, indicating that more calcium sources or less phosphorus sources lead to changes in the structure and crystallinity of HAP. The crystallinit...

Embodiment 3

[0050] Use 0.2g of the material prepared in Example 1 to treat 100mL of a solution containing copper, cobalt, and nickel coexistence. The concentration of the three heavy metals is 50mg / L. Under a constant temperature shaker at 30°C, take a sample after reacting for 20min, and use inductively coupled plasma to emit The concentration of copper, cobalt and nickel in the solution after the reaction is measured by a spectrometer, and the removal rate of copper, cobalt and nickel can reach more than 99% in a short period of time.

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Abstract

The invention discloses a hydroxyapatite-loaded nano-zero-valent iron composite material and a method for its preparation and application. The preparation method uses hydrothermally synthesized hydroxyapatite as a carrier, and absorbs Fe 2+ Several hours later, the ferrous iron was reduced under an inert gas atmosphere to obtain nanometer zero-valent iron, which was washed, centrifuged, and freeze-dried to obtain a nanometer zerovalent iron composite material loaded with hydroxyapatite. It has the best removal effect on hexavalent chromium, reducing highly toxic hexavalent chromium to low toxicity, and the removal rate can reach 100%, and it can efficiently and quickly remove divalent heavy metal cations such as copper, cobalt, and nickel in wastewater at the same time , The removal rate is also as high as about 98%. The invention can be applied to the removal and purification of heavy metal ions in waste water, and can also be used for repairing contaminated soil containing various heavy metals.

Description

technical field [0001] The invention belongs to the technical field of environmental green restoration materials and their preparation and application, and relates to a hydroxyapatite-loaded nano zero-valent iron composite material and a method for its preparation and application. It is suitable for the treatment of wastewater containing copper, cobalt, nickel, hexavalent chromium and other heavy metal ions, as well as the restoration and treatment of soil polluted by these heavy metals. Background technique [0002] Hexavalent chromium, copper, cobalt, nickel and other heavy metal ions often coexist in the wastewater generated by electroplating, ore mining, metal smelting and other industries. If they are discharged randomly without treatment or if the treatment is not up to standard, it will cause serious damage to the ecological environment and human health. threat. Moreover, during the production process, heavy metals such as hexavalent chromium, copper, cobalt, and nic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30B09C1/08C02F1/28C02F101/20C02F101/22
CPCB01J20/02B01J20/0229B01J20/048B01J2220/42B01J2220/4806B09C1/08C02F1/281C02F2101/20C02F2101/22
Inventor 杨卫春席冬冬杨志辉张晓明廖骐石岩王海鹰李晓敏贺宇宏
Owner CENT SOUTH UNIV
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