Method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution

A technology of trichloroethylene and compound pollution, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problem of inability to achieve simultaneous removal of hexavalent chromium-trichloroethylene compound pollution, and achieve abundant reserves. , Improve dissolution and corrosion ability, increase the effect of exposed area

Inactive Publication Date: 2022-01-28
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the insufficient research on the removal of hexavalent chromium and trichlorethylene composite pollution existing in the existing methods, and the simultaneous removal of hexavalent chromium-trichlorethylene composite pollution that cannot be realized under reducing conditions, the present invention provides an attapulgite-nano A method for synchronously and efficiently removing composite pollution of hexavalent chromium and trichlorethylene by zero-valent iron composite material-sodium persulfate system, which simultaneously improves the utilization rate of attapulgite-nano-zero-valent iron composite material and the removal rate of trichlorethylene

Method used

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  • Method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution
  • Method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution
  • Method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution

Examples

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Embodiment 1

[0019] This example provides a method for separately removing hexavalent chromium, separately removing trichlorethylene, and simultaneously removing hexavalent chromium and trichlorethylene combined pollution by the attapulgite-nano zero-valent iron composite material-sodium persulfate system, and comparing the methods s efficiency.

[0020] A separate removal of hexavalent chromium system

[0021] Step 1, add 20mL of water containing 30mg / L hexavalent chromium and 8mg of attapulgite-nanometer zero-valent iron material in a borosilicate glass bottle lined with a 22mL silica gel pad with a screw cap, and the pH is 3.5;

[0022] Step 2, after sealing, place the borosilicate glass bottle in a thermostatic oscillator, set the rotation speed at 150 rpm, the temperature at 25° C., and the reaction time for 24 hours.

[0023] B. Trichlorethylene removal system alone

[0024] Step 1, weighing 8 mg of the attapulgite-nano zero-valent iron composite material and placing it in a 22 mL ...

Embodiment 2

[0037] This example provides a method for synchronous removal of hexavalent chromium and trichlorethylene by the attapulgite-nano zero-valent iron composite material-sodium persulfate system, and compares the removal of hexavalent chromium and trichlorethylene with different concentrations of sodium persulfate. Impact.

[0038] Step 1, weighing 8 mg attapulgite-nano zero-valent iron composite material, and placing it in a 22 mL borosilicate crimp glass bottle lined with a silica gel pad;

[0039] Step 2, add 20mL of water containing 30mg / L hexavalent chromium with a pH value of 3.5 into the above-mentioned 22mL borosilicate crimp glass bottle;

[0040] Step 3, synchronously add different volumes (0, 10, 20, 40, 80 μL) of 1 mol / L sodium persulfate solution and 100 μL of 4000 mg / L trichlorethylene solution to the above mixed solution;

[0041] Step 4: Immediately seal the above-mentioned borosilicate glass bottle, and place it in a constant temperature oscillator with a rotatio...

Embodiment 3

[0047] This embodiment provides a method for synchronously and efficiently removing hexavalent chromium and trichlorethylene composite pollution by the attapulgite-nano zero-valent iron composite material-sodium persulfate system, and compares the effect of different sodium persulfate injection times (0-12h) on the hexavalent chromium and trichlorethylene. Chromium and trichlorethylene removal effects.

[0048] Step 1, weigh 8 mg of attapulgite-nano zero-valent iron composite material, and place them in 22 mL borosilicate crimp glass bottles lined with silica gel pads;

[0049] Step 2, add 20 mL of an aqueous solution containing 30 mg / L hexavalent chromium to the above-mentioned borosilicate crimp glass bottle, the pH is 3.5;

[0050] Step 3: Add 100 μL of 4000 mg / L trichlorethylene solution to the above mixture using a micro-glass sampling needle; then seal and place in a constant temperature oscillator with a rotation speed of 150 rpm and a temperature of 25 °C;

[0051] St...

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Abstract

The invention discloses a method for synchronously and efficiently removing hexavalent chromium and trichloroethylene combined pollution, which is characterized by comprising the following steps of: adding an attapulgite-nano zero-valent iron composite material into polluted water containing hexavalent chromium and trichloroethylene, adding sodium persulfate, oscillating at the constant temperature of 25 DEG C for 24 hours, and synchronously removing hexavalent chromium and trichloroethylene. The method is simple, convenient and rapid, and the pollutant removal condition can be accurately judged. According to the method, agglomeration of the zero-valent iron is reduced, the activity and the utilization rate of the attapulgite-nano zero-valent iron are remarkably improved, and the method has the advantages of high synchronous removal efficiency of hexavalent chromium and trichloroethylene, low cost and the like, and has a very good application prospect in heavy metal-chlorinated hydrocarbon combined pollution remediation.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and relates to a method for efficiently synchronously removing hexavalent chromium and trichlorethylene composite pollution, in particular to an attapulgite-nano-zero-valent iron composite material-sodium persulfate system for efficiently synchronously removing hexavalent chromium and trichlorethylene. The method of combined pollution of chromium and trichlorethylene. Background technique [0002] With the development of industrial economy and the influence of human activities, pollutants in the environment rarely exist alone, and different types of pollutants enter the same environment at the same time or successively and affect each other, forming compound pollution is very common in chemical industry parks and other areas ; In its groundwater, complex pollution is common and is a serious environmental problem. For example, the typical compound pollution of inorganic heavy meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/70C02F101/22C02F101/36
CPCC02F1/72C02F1/725C02F1/705C02F2101/22C02F2101/36C02F2209/02C02F2305/023
Inventor 陈梦舫张文影钱林波杨磊韩璐
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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