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Method for removing divalent cadmium in wastewater by using carboxylated magnetic graphene oxide

A technology of oxide stone and carboxylation, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve problems such as difficult solid-liquid separation, and achieve low processing cost, wide range of raw material sources, high price low cost effect

Inactive Publication Date: 2014-09-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of diethylenetriaminetetraacetic acid carries many amino groups and carboxyl groups, which can produce a good enveloping effect on heavy metals and organic pollutants, but it is not easy to achieve solid-liquid separation as an adsorbent for heavy metals
There is no precedent for the application of carboxylated magnetic graphene oxide in the treatment of cadmium-containing wastewater

Method used

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  • Method for removing divalent cadmium in wastewater by using carboxylated magnetic graphene oxide
  • Method for removing divalent cadmium in wastewater by using carboxylated magnetic graphene oxide
  • Method for removing divalent cadmium in wastewater by using carboxylated magnetic graphene oxide

Examples

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Embodiment 1

[0019] A kind of method utilizing carboxylated magnetic graphene oxide of the present invention to remove divalent cadmium in waste water comprises the following steps:

[0020] 1. Preparation of Carboxylated Magnetic Graphene Oxide

[0021] (1) 3.0g graphite, 2.5g K 2 S 2 o 8 , 2.5g P 2 o 5 and 1~20mL H 2 SO 4 After mixing, heat it in a water bath to 60-100°C, add 0.5L of ultrapure water after 4 hours of reaction, let it stand for 12 hours after cooling, wash with ultrapure water to remove residual acid, dry it in vacuum at 60°C, and add the dried product to 120mL temperature H at 0°C 2 SO 4 (98%), then add 2.5g NaNO 3 , 15g KMnO 4 , and shake at 20°C for 4h, then react at 35°C for 2h, then add 250mL of water to ensure that the reaction temperature is controlled at 90°C, continue to shake for 1h, then add 0.5L of water and 20mL of H 2 o 2 (30%), shake at room temperature for 2h, then wash repeatedly with HCl (mass concentration is 10%) and water, then ultrasonical...

Embodiment 2

[0032] A kind of method utilizing carboxylated magnetic graphene oxide of the present invention to remove divalent cadmium in waste water comprises the following steps:

[0033] 1. Preparation of Carboxylated Magnetic Graphene Oxide

[0034] This step is the same as Step 1 of Example 1.

[0035] 2. Treat divalent cadmium wastewater

[0036] Prepare three 50mL divalent cadmium wastewater with a concentration of 10mg / L, and adjust the pH value to 6 with nitric acid or sodium hydroxide. The carboxylated magnetic graphene oxide prepared by the above method was added to the above-mentioned 10 divalent cadmium wastewaters, and the dry weight of the carboxylated magnetic graphene oxide added in each liter of wastewater was 58 mg. The reactor was placed in an oscillating box with a rotating speed of 150 rpm, and the temperature was kept at 30°C. After oscillating for 12 hours, the composite material was separated from the solution, and the treatment of divalent cadmium wastewater wa...

Embodiment 3

[0041] A kind of method utilizing carboxylated magnetic graphene oxide of the present invention to remove divalent cadmium in waste water comprises the following steps:

[0042] 1. Preparation of Carboxylated Magnetic Graphene Oxide

[0043] This step is the same as Step 1 of Example 1.

[0044] 2. Treat divalent cadmium wastewater

[0045] The carboxylated magnetic graphene oxide prepared above is added to the divalent cadmium wastewater that the initial pH value is 6 and the initial concentration is 10mg / L, and the carboxylated magnetic graphene oxide dry weight added in every liter of wastewater is 58mg. The reactor was placed in a shaking box with a rotating speed of 150rpm, and the temperature was kept at 30°C. Samples were taken at 5, 10, 20, 40, 60, 120, 240, 360, 540, and 720 minutes after the start of shaking, and flame atomic absorption spectrometry was used to The concentration of remaining divalent cadmium ions in the solution was measured by photometry, and the ...

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Abstract

The invention discloses a method for removing divalent cadmium in wastewater by using carboxylated magnetic graphene oxide. The method comprises the following steps of taking a certain quantity of divalent cadmium wastewater, and regulating the pH value of the divalent cadmium wastewater to 2.0-11.0 (preferably 5.0-7.0, most preferably 6); adding a certain quantity of carboxylated magnetic graphene oxide into the wastewater, wherein the dry weight of carboxylated magnetic graphene oxide added in every liter of wastewater is 0.02-5g; reacting in a constant-temperature oscillator with the rotating speed of 50-300rpm for 0-24h (most preferably 1-6h) while controlling the reaction temperature at 10-50 DEG C (most preferably 20-40 DEG C); separating carboxylated magnetic graphene oxide from the solution after the reaction is ended to finish the removal of divalent cadmium in wastewater. The method has the advantages of low cost, convenience in operation, high treatment efficiency, easiness for separation and recovery and the like.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and in particular relates to the application of carboxylated magnetic graphene oxide in the treatment of heavy metal wastewater. Background technique [0002] With the development of industries such as dyestuffs, metallurgy, electroplating, and mining, more and more heavy metal ions enter the environment, and the soil, water, and other environments that humans rely on for survival have suffered serious heavy metal pollution, and the trend is increasing. When the content of heavy metals exceeds a certain limit, it will cause the deterioration of the ecological environment and the decline of the quality of agricultural products, which will seriously affect human health. As a heavy metal, cadmium can irritate the respiratory tract. Long-term exposure can cause anosmia, macular plaques or yellow circles on the gums. Cadmium compounds are not easil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 王慧刘云国胡新将曾光明李婷婷江卢华郭方颖王姝凡张明明
Owner HUNAN UNIV
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