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Method for removing hexavalent chromium in wastewater by using cyclohexane diamine-tetracetic acid modified magnetic graphene oxide

A technology of cyclohexamethylenediaminetetraacetic acid and oxidized rock, which is applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve the problems of reduced adsorption sites and decreased adsorption capacity, and achieve more adsorption sites , easy to operate, easy to separate and recycle

Inactive Publication Date: 2015-06-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnetization process causes some adsorption sites on the surface of GO to be occupied by magnetic nanoparticles, resulting in the reduction of adsorption sites on the surface of magnetic GO and the decrease of adsorption capacity.

Method used

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  • Method for removing hexavalent chromium in wastewater by using cyclohexane diamine-tetracetic acid modified magnetic graphene oxide
  • Method for removing hexavalent chromium in wastewater by using cyclohexane diamine-tetracetic acid modified magnetic graphene oxide
  • Method for removing hexavalent chromium in wastewater by using cyclohexane diamine-tetracetic acid modified magnetic graphene oxide

Examples

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Embodiment 1

[0024] A method for removing hexavalent chromium in waste water by magnetic graphene oxide modified with cyclohexanediaminetetraacetic acid according to the present invention may further comprise the steps:

[0025] 1. Preparation of Adsorbent

[0026] (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 repeatedly wash with HCl (mass concentration is 10%) and water, then u...

Embodiment 2

[0037] A method for removing hexavalent chromium in waste water by magnetic graphene oxide modified with cyclohexanediaminetetraacetic acid according to the present invention may further comprise the steps:

[0038] 1. Preparation of Adsorbent

[0039] This step is the same as Step 1 of Example 1.

[0040] 2. Treatment of wastewater containing hexavalent chromium

[0041] Prepare 10 parts of 20mg / L hexavalent chromium solution, use 1mol / L NaOH or HNO 3 Adjust the pH to 3. Add the above-mentioned magnetic graphene oxide modified by cyclohexanediaminetetraacetic acid, and the amount of adsorbent is 0.066g / L. Place them in a constant temperature shaker at 30°C. The oscillator speed is 150 rpm, and the oscillation time is 10, 20, 30, 60, 90, 180, 360, 720, 1080, 1440 minutes respectively. After the reaction, place on a magnet to separate the adsorbent from the solution. The concentration of hexavalent chromium ions in the solution after adsorption was measured by ultraviolet...

Embodiment 3

[0047] A method for removing hexavalent chromium in waste water by magnetic graphene oxide modified with cyclohexanediaminetetraacetic acid according to the present invention may further comprise the steps:

[0048] 1. Preparation of Adsorbent

[0049] This step is the same as Step 1 of Example 1.

[0050] 2. Treatment of wastewater containing hexavalent chromium

[0051] Prepare hexavalent chromium solutions with concentrations of 10, 20, and 40mg / L respectively, and use 1mol / L NaOH or HNO 3 Adjust the pH to 3. Add the above-mentioned magnetic graphene oxide modified by cyclohexanediaminetetraacetic acid, and the amount of adsorbent is 0.066g / L. Place them in a constant temperature shaker at 30°C. The oscillator speed is 150 rpm, and the oscillation time is 24 hours respectively. After the reaction, place on a magnet to separate the adsorbent from the solution. The concentration of hexavalent chromium ions in the solution after adsorption was measured by ultraviolet spe...

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Abstract

The invention discloses a method for removing hexavalent chromium in wastewater by using cyclohexane diamine-tetracetic acid modified magnetic graphene oxide. The method comprises the following steps: getting a certain amount of hexavalent chromium wastewater, adjusting the pH value to 1.0-10 (preferably 2.0-6.0), adding a certain amount of cyclohexane diamine-tetracetic acid modified magnetic graphene oxide into the wastewater, wherein the dry weight of the carboxylated magnetic graphene oxide in per liter of the wastewater is 0.02-3g, reacting for 0-48h (preferably 1-24h) in a constant temperature oscillator at the rotating speed of 100-200 rpm, controlling the reaction temperature to 10-50 DEG C (15-45 DEG C), and separating the cyclohexane diamine-tetracetic acid modified magnetic graphene oxide from the solution after finishing reaction to finish the removal of the hexavalent chromium in the wastewater. The method provided by the invention has the advantages of low cost, convenience in operation, high processing efficiency and easiness in separation and recycling.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and mainly relates to the application of cyclohexanediaminetetraacetic acid-modified magnetic graphene oxide in the treatment of heavy metal wastewater. Background technique [0002] In recent years, heavy metal pollution has become more and more serious. The heavy metals discharged into the natural atmosphere, water, and soil during the mining, smelting, and processing of heavy metals have caused great harm to the natural environment and humans. Chromium is a heavy metal with a wide range of uses. It is widely used in the manufacture of cosmetic raw materials, leather preparations, chrome plating of metal parts, industrial pigments, leather tanning, rubber production, and ceramic raw material production. The industrial wastewater discharged contains A large amount of chromium compounds, mainly hexavalent chromium Cr(VI). Once Cr(VI)-rich was...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62B01J20/22B01J20/30
Inventor 郭方颖刘云国王慧胡新将曾光明李婷婷王姝凡张明明
Owner HUNAN UNIV
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