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Method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite

A technology of chloroapatite and heavy metals, which is applied in the field of physical and chemical treatment of heavy metals in polluted sediments, can solve the problems of water eutrophication, secondary pollution, and low repair effect, and achieve the purpose of inhibiting water eutrophication and enhancing passivation. The effect of chemicalization and inhibiting the growth of algae

Active Publication Date: 2017-05-10
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Apatite minerals such as chloroapatite are insoluble phosphates, which are limited by their solubility and mobility during the in-situ remediation process, and their remediation effect on sediment heavy metal lead is lower than that of soluble phosphates. It is very easy to cause eutrophication of water body and cause secondary pollution

Method used

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  • Method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite
  • Method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite
  • Method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite

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Embodiment 1

[0038] A modified nano-chloroapatite (Rha-nClAP) of the present invention, the modified nano-chloroapatite is composed of rhamnolipid (Rha) and nano-chloroapatite, and the rhamnolipid is modified on the nano On the surface of chloroapatite, the mass ratio of nano chloroapatite to rhamnolipid is 46.498:1.

[0039] In this embodiment, the modified nano-chloroapatite has a particle size of 2nm-5nm.

[0040] A preparation method of the modified nano-chloroapatite of the above-mentioned present embodiment, comprising the following steps:

[0041] (1) Preparation of rhamnolipid solution: take 30mg rhamnolipid (the purity of this rhamnolipid is 90%, the critical micelle concentration is 25mg / L, and monorhamnolipid and dirhamnose The mass ratio of lipid is 2:1) dissolved in 800mL ultrapure water, placed in ultrasonic wave for ten minutes, then adjusted the pH value of the solution to 8.4 with 0.1M sodium hydroxide to make it completely dissolved, and added an appropriate amount of ul...

Embodiment 2

[0047] A modified nano-chloroapatite (Rha-nClAP) of the present invention, the modified nano-chloroapatite is composed of rhamnolipid (Rha) and nano-chloroapatite, and the rhamnolipid is modified on the nano On the surface of chloroapatite, the mass ratio of nano chloroapatite to rhamnolipid is 27.8988:1.

[0048] In this embodiment, the particle size of the modified nano-chloroapatite particles is 2nm-5nm.

[0049] A preparation method of the modified nano-chloroapatite of the above-mentioned present embodiment, comprising the following steps:

[0050] (1) Preparation of rhamnolipid solution: take 50mg rhamnolipid (the purity of this rhamnolipid is 90%, the critical micelle concentration is 25mg / L, and monorhamnolipid and dirhamnose The mass ratio of lipid is 2:1) dissolved in 800mL ultrapure water, placed in ultrasonic wave for ten minutes, then adjusted the pH value of the solution to 8.4 with 0.1M sodium hydroxide to make it completely dissolved, and added an appropriate ...

Embodiment 3

[0057] A modified nano-chloroapatite (Rha-nClAP) of the present invention, the modified nano-chloroapatite is composed of rhamnolipid (Rha) and nano-chloroapatite, and the rhamnolipid is modified on the nano On the surface of chloroapatite, the mass ratio of nano chloroapatite to rhamnolipid is 19.9277:1.

[0058] In this embodiment, the particle size of the modified nano-chloroapatite is 2nm-5nm.

[0059] A preparation method of the modified nano-chloroapatite of the above-mentioned present embodiment, comprising the following steps:

[0060] (1) Preparation of rhamnolipid solution: take by weighing 70mg rhamnolipid (the purity of this rhamnolipid is 90%, the critical micelle concentration is 25mg / L, and monorhamnolipid and double rhamnose The mass ratio of lipid is 2:1) dissolved in 800mL ultrapure water, placed in ultrasonic wave for 10 minutes, then adjusted the pH value of the solution to 8.4 with 0.1M sodium hydroxide to make it completely dissolved, and added an approp...

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Abstract

The invention discloses a method for passivating heavy metal lead in bottom mud by using modified nanochlorapatite. The method comprises the following steps of airing lead-containing bottom mud, and crushing the lead-containing bottom mud to obtain crushed lead-containing bottom mud; and adding the modified nanochlorapatite to the crushed lead-containing bottom mud for standing, and passivating heavy metal lead in the bottom mud, wherein the modified nanochlorapatite is prepared from nanochlorapatite and rhamnolipid; the rhamnolipid is modified on the surface of the nanochlorapatite; and the mass ratio of the nanochlorapatite to the rhamnolipid is (19.9277-47):1. The method is simple and convenient to operate, significant in passivation effect on the heavy metal lead and suitable for in-situ repairing of the bottom mud, and has the characteristics of being environment-friendly and harmless.

Description

technical field [0001] The invention belongs to the field of physical and chemical treatment of heavy metals in polluted bottom mud, and in particular relates to a method for passivating heavy metal lead in bottom mud by using modified nano-chloroapatite. Background technique [0002] With the acceleration of economic globalization and the rapid development of industry and agriculture, the environmental pollution caused by heavy metal emissions has gradually become prominent, directly threatening human health and survival. Heavy metal pollution in soil and sediment mainly comes from industrial and agricultural production (such as smelting, chemical production), domestic sewage discharge, and the use of a large number of pesticides and fertilizers. Methods for treating heavy metal-contaminated sediment include in-situ remediation technology and ex-situ remediation technology. Commonly used in-situ treatment technologies include physical, chemical, and biological methods; ex-s...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F1/50C02F101/20
CPCC02F1/50C02F11/004C02F2101/20
Inventor 万佳曾光明黄丹莲胡亮黄超薛文静郑凯旋赖萃邓锐姜丹妮
Owner HUNAN UNIV
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