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Method for removing heavy metal chromium in water body

A heavy metal and water technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reducing the pollutant removal ability of nZVI, hindering the contact reaction of nZVI, etc., to achieve good reduction and removal effect, promote Corrosion reaction and co-precipitation inhibition effect

Active Publication Date: 2015-09-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented new technique uses certain compounds called eDNQs or nitrilotrimers instead of traditional chemical reducing substances like zinc sulfate. These techniques help enhance the activity of these materials against harmful metals found naturally occurring throughout our bodies' environments. By combining them together into one molecule, they become more effective when combined with other similar molecules than just two atoms per unit cell. Overall this innovative approach helps improve the performance and lifespan of various technologies involving catalyst systems.

Problems solved by technology

This patents discuss different ways for removing harmful substances like chrome into safe waters through methods called chelate treatment technology. These technologies involve adding certain metallic salts containing cobalt to contaminated areas where these materials are present. Exposure causes damage to fishery crops and other organisms living around them. To address this issue, regulators require monitoring procedures to detect any potential hazards caused by environmental concerns related to disposal of industrial effluences.

Method used

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  • Method for removing heavy metal chromium in water body
  • Method for removing heavy metal chromium in water body
  • Method for removing heavy metal chromium in water body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of method of removing heavy metal chromium in water body of the present invention, comprises the following steps:

[0028] (1) Preparation of nanometer zero-valent iron (nZVI), the specific steps are:

[0029] 1.1. Weigh 2.71×10 -2 g NaBH 4 Dissolved in 10 mL deionized water to prepare NaBH with a concentration of 0.072 mol / L 4 solution.

[0030] 1.2. Take FeSO 4 ·7H 2 O was dissolved in 10 mL deionized water to prepare FeSO with a concentration of 0.036 mol / L 4 solution.

[0031] 1.3. Under electric stirring at room temperature and normal pressure, mix 10 mL of NaBH prepared in step 1.1 4 The solution was added dropwise at a rate of 0.05 mL / s into the 10 mL FeSO solution prepared in step 1.2. 4 In the three-necked flask of the solution, during the dropwise addition of FeSO 4 The solution gradually turned black. After the dropwise addition was completed, the stirring was continued for 30 min, and ultrasonic treatment was performed at the same time to ma...

Embodiment 2

[0039] A kind of method of removing heavy metal chromium in water body of the present invention, comprises the following steps:

[0040] (1) Preparation of nanometer zero-valent iron (nZVI): same as in Example 1.

[0041] (2) Add nZVI and ethylenediamine disuccinic acid (EDDS) to the chromium-containing water body with a pH value of 7 and a Cr(VI) concentration of 10 mg / L, and mix well to obtain a reaction solution, wherein the initial concentration of EDDS in the reaction solution The concentrations were 3 mM, 4 mM, and 5 mM, respectively, and the initial concentration of nZVI was 0.1 g / L.

[0042] In the above step (2), the concentration of Cr(VI) is 0.05 mg / L-50 mg / L, and the initial concentration of nZVI is 0.1 g / L-1 g / L, both of which can achieve the same or similar technical effects.

[0043] (3) The reaction solution in step (2) was placed in a digital display water bath constant temperature oscillator for constant temperature oscillation treatment. The temperature of ...

Embodiment 3

[0048] A kind of method of removing heavy metal chromium in water body of the present invention, comprises the following steps:

[0049] (1) Preparation of nanometer zero-valent iron (nZVI): same as in Example 1.

[0050] (2) Add nZVI and ethylenediamine disuccinic acid (EDDS) to the chromium-containing water body with a pH value of 9 and a Cr(VI) concentration of 10 mg / L, and mix well to obtain a reaction solution, wherein the initial concentration of EDDS in the reaction solution The concentrations were 2mM, 3mM, 4mM, 5mM, respectively, and the initial concentration of nZVI was 0.1 g / L.

[0051] In the above step (2), the concentration of Cr(VI) is 0.05 mg / L-50 mg / L, and the initial concentration of nZVI is 0.1 g / L-1 g / L, both of which can achieve the same or similar technical effects.

[0052] (3) The reaction solution in step (2) was placed in a digital display water bath constant temperature oscillator for constant temperature oscillation treatment. The temperature of co...

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Abstract

The invention discloses a method for removing heavy metal chromium in a water body. The method comprises the steps of adding nanometre zero-valent iron and ethylene diamino-disuccinic acid in a chromium-containing water body and carrying out a constant-temperature oscillation treatment to finish a treatment for the chromium-containing water body. According to the method disclosed by the invention, the capacity for removing Cr(VI), of nZVI is improved by reducing Cr(VI) into low-toxicity Cr(III) by virtue of the nZVI, and adding a chelating agent EDDS to complex with the Fe(III)/Cr(III) generated in the reaction to prevent the Fe(III)/Cr(III) from co-precipitation on the surface of the nZVI. The method disclosed by the invention has the following advantages: the process is simple, the reaction time is short, the used chelating agent is easy to degrade in an environment, and the like; by adding the EDDS, the removal rate of the nZVI for the Cr(VI) is increased by 20-40%, and meanwhile, the application range of the nZVI is expanded; a great reductive removal effect is achieved on pollutants in a common pH value range of 5-9 of the water body.

Description

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Claims

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Application Information

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Owner HUNAN UNIV
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