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Method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron

A nano-zero-valent iron and heavy metal technology, applied in metal processing equipment, chemical instruments and methods, sludge treatment, etc., can solve the problems of nano-zero-valent iron instability, reduced reactivity, and mobility, and achieve good surface effects. , The effect of low repair cost and short processing cycle

Inactive Publication Date: 2015-01-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because nano-zero-valent iron is very unstable, it is easy to collide with each other, condense and aggregate into large particles, and it is easy to react with water and oxygen in the environment, resulting in a decrease in its reactivity and mobility.

Method used

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  • Method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron
  • Method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron
  • Method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of modified nano zero-valent iron.

[0037] Preparation of nano zero-valent iron:

[0038] (1) FeSO 4 Solution preparation: weigh 0.7000g FeSO 4 ·7H 2 Put O in a beaker, add an appropriate amount of ultrapure water to dissolve and transfer to a 50mL volumetric flask, set the volume to the mark, and shake well to obtain 0.05M FeSO 4 solution.

[0039] (2)NaBH 4 Solution preparation: weigh 0.3783g NaBH 4 Put it in a beaker, add an appropriate amount of ultrapure water to dissolve and transfer it to a 50mL volumetric flask, set the volume to the mark, and shake well to obtain 0.2M NaBH 4 solution.

[0040] (3) Preparation of nanometer zero-valent iron (nZVI) particles: 50mL, 0.05M FeSO 4 The solution was added into a 250mL three-necked flask, and under the protection of nitrogen and mechanical stirring, an equal volume of 0.2M NaBH 4The solution was dropped into the three-necked flask drop by drop at a constant speed. After the constant-spee...

Embodiment 2

[0046] Example 2: To investigate the effect of the amount of stabilizer added on the treatment efficiency of heavy metal chromium.

[0047] The chromium-containing sludge is pretreated, and the specific pretreatment steps are:

[0048] (1) The chromium-containing bottom sludge is freeze-dried at minus 40 degrees Celsius in a freeze dryer;

[0049] (2) Mechanically grind the chromium-containing bottom sludge that has been freeze-dried, first pass through a 1mm sieve, and then pass through a <0.63mm sieve to complete the pretreatment of the bottom sludge.

[0050] The modified nano-zero-valent iron A1, A2, A3, A4, and A5 were respectively used to treat the heavy metals in the pretreated sediment and the heavy metals in the tail water of the sediment dredging.

[0051] The method for processing the heavy metal content in the bottom mud dredging tail water is specifically: according to the dosage of 1.0g / L, add it to 100mL of chromium-containing bottom mud dredging tail water wit...

Embodiment 3

[0057] Example 3: Investigating the treatment efficiency of modified nanometer zero-valent iron on heavy metal chromium in sediment under different pH conditions.

[0058] Experiment 1 group (SDS-nZVI): get 250g of chromium-containing bottom mud (the chromium-containing bottom mud is pretreated according to the method in Example 2), and detect the heavy metal Cr in the chromium-containing bottom mud. 6+ The concentration is 100mg / kg, and the chromium-containing bottom mud is divided into 5 parts on average, each 50g. The stabilizer (SDS) concentration that is made in embodiment 1 is respectively the modified nanometer zero valent iron of 0.3g / L according to 1.0g / kg wet weight is added in the chromium-containing bottom mud of 50g, with 1M HCl and NaOH The solution adjusts the pH value of the bottom mud to be 5, 6, 7, 8, 9 respectively, then shakes at a constant temperature at 25°C and 300rmp, and after 24h, the bottom mud after the treatment is leached (leaching treatment metho...

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Abstract

The invention discloses a method for removing heavy metal chromium in bottom mud by using modified nano zero-valent iron. The method comprises the following steps: adding the modified nano zero-valent iron into the bottom mud containing chromium for performing constant-temperature oscillation treatment, so as to complete treatment on the bottom mud containing chromium, wherein the modified nano zero-valent iron is prepared from lauryl sodium sulfate and nano zero-valent iron in an ultrasonic dispersion manner. As lauryl sodium sulfate is adopted to modify nano zero-valent iron, due to the steric-hindrance effect, the nano material is stabilized, the modified nano zero-valent iron is higher in removal rate of the heavy metal chromium, shorter in treatment period, higher in reaction activity, lower in repairing cost, clean and free of pollution, simple and convenient in treatment, and free of toxic or harmful function on the environment.

Description

technical field [0001] The invention belongs to the field of physical and chemical treatment of heavy metals in polluted environments, and in particular relates to a method for removing heavy metal chromium in sediment by using modified nanometer zero-valent iron. Background technique [0002] With the acceleration of urbanization and the rapid development of industry and agriculture, the vast majority of cities and towns in my country have serious water pollution problems, a large amount of untreated industrial wastewater, and unreasonable landfill and stacking of civil solid waste, heavy metals The accidental discharge of pollutants and the use of a large amount of chemical fertilizers and pesticides have caused various heavy metal pollutants to enter the water body. Because heavy metals are difficult to control, and they are highly stable and refractory in water bodies, and because of the high content of particulate organic matter in water, heavy metals are easy to complex...

Claims

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Application Information

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IPC IPC(8): C02F11/00B22F9/24B22F1/00C02F101/22
CPCC02F11/004B22F9/24C02F2101/22B22F1/054
Inventor 黄丹莲陈国敏曾光明许飘赖萃晏铭李宁杰程敏
Owner HUNAN UNIV
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