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Method for large-scale preparation of oxidized graphene and selective adsorption of thorium in water

A large-scale preparation and graphene technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, inorganic chemistry, etc., can solve the problems of purifying products, limiting large-scale industrial production of graphite oxide, etc., achieving low raw material cost and low cost The effect of low and high adsorption capacity

Inactive Publication Date: 2013-06-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since graphite oxide is rich in oxygen-containing functional groups, it interacts with water in a viscous shape, and it is impossible to directly purify the product by simple suction filtration combined with water washing
Generally, a high-speed centrifuge is used to separate the solid-liquid of the newly prepared graphite oxide, and then the graphite oxide is purified by dialysis to remove residual metal ions. This method limits the large-scale industrial preparation of graphite oxide.

Method used

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  • Method for large-scale preparation of oxidized graphene and selective adsorption of thorium in water
  • Method for large-scale preparation of oxidized graphene and selective adsorption of thorium in water
  • Method for large-scale preparation of oxidized graphene and selective adsorption of thorium in water

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Effect test

Embodiment 1

[0033] Embodiment 1: concrete steps are as follows:

[0034] (1) Preparation of single-layer graphene oxide aqueous dispersion: using graphite powder as raw material, take 10 grams of graphite powder, add 240 ml of concentrated sulfuric acid, stir at 0°C for 30 minutes to mix evenly, and then slowly add 60 gram of potassium permanganate, after adding, continue to stir at 0°C for 2 hours, then transfer to 35°C in a warm water bath and stir for 30 minutes, dilute with 200 ml of deionized water, and continue to dilute at 95°C after dilution Stir under the conditions for 30 minutes, cool to 50°C and add 120 ml of hydrogen peroxide solution; then put the above solution to stand for stratification, pour off the supernatant, add 1 liter of deionized water and 0.3 ml of concentrated hydrochloric acid to wash, repeat the above operation 5 times to remove metal ions; filter under reduced pressure, wash 4 times with deionized water until the pH value of the filtrate remains constant, to re...

Embodiment 2

[0036] Embodiment 2: concrete steps are as follows:

[0037] (1) Preparation of single-layer graphene oxide aqueous dispersion: using graphite powder as raw material, take 50 grams of graphite powder, add 1200 ml of concentrated sulfuric acid, stir at 0°C for 1 hour to mix evenly, and then slowly add 300 gram of potassium permanganate, after adding, continue to stir at 0°C for 5 hours, then transfer to 35°C in a warm water bath and stir for 3 hours, dilute with 1 liter of deionized water, and continue to stir at 95°C after dilution Stir under the same conditions for 1 hour, add 600 ml of hydrogen peroxide solution after cooling to 60 °C; then put the above solution to stand for stratification, pour off the supernatant, add 2 liters of deionized water and 1 ml of concentrated hydrochloric acid to wash, repeat the above operation 10 times to remove metal ions; filter under reduced pressure, wash 8 times with deionized water until the pH value of the filtrate remains constant, to...

Embodiment 3

[0039] Embodiment 3: concrete steps are as follows:

[0040] (1) Preparation of single-layer graphene oxide aqueous dispersion: using graphite powder as raw material, take 100 grams of graphite powder, add 1.2 liters of concentrated sulfuric acid, stir at 0°C for 6 hours to make it evenly mixed, and then slowly add 600 gram of potassium permanganate, after adding, continue to stir at 0°C for 10 hours, then transfer to 35°C in a warm water bath and stir for 5 hours, dilute with 2 liters of deionized water, and continue to dilute at 95°C after dilution Stir under the same conditions for 5 hours, add 1.2 liters of hydrogen peroxide solution after cooling to 40°C; then put the above solution into layers, pour off the supernatant, add 5 liters of deionized water and 4 ml of concentrated hydrochloric acid to wash, repeat the above operation 20 times to remove metal ions; filter under reduced pressure, wash 8 times with deionized water until the pH value of the filtrate remains const...

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Abstract

The invention discloses a method for large-scale preparation of oxidized graphene and selective adsorption of thorium in water, belonging to the technical field of treatment of radioactive wastewater in nuclear wastes and environment protection. The method comprises the following specific steps of: oxidizing graphite by adopting an oxidant, adding water and concentrated hydrochloric acid, conglomerating, settling, pouring out, filtrating, washing and drying to obtain graphite oxide, and stripping by ultrasonic waves to obtain a single-layer graphene oxide aqueous dispersion. According to the method, an oxidative product of graphite, which is conglomerated and settled through the concentrated hydrochloric acid, can be very easily purified and separated to obtain graphite oxide, and the industrial large-scale preparation of single-layer graphite oxide is realized. The method has the characteristics of low cost, simple and convenient operation and good reproducibility; and simultaneously oxidized graphene can serve as a solid-phase adsorbent for adsorption of thorium in water and shows high adsorption capacity and selectivity (adsorption capacity qe is 529.6mgTh / g oxidized graphene, and the distribution coefficient Kd is 3047mL / g).

Description

technical field [0001] The invention discloses a method for large-scale preparation of graphene oxide and selective adsorption of thorium in water, and belongs to the technical field of nuclear waste medium and low radioactive waste water treatment and environmental protection. Background technique [0002] Thorium is contained in radioactive wastewater, which mainly comes from mining, rare earth metallurgy, nuclear industry, nuclear power plants (including nuclear accidents) and laboratory research. This radioactive element is highly toxic even at a very low concentration, threatening the health of the human living environment. After entering the human body, it will cause irreversible damage to cells, lymph nodes, lungs, liver, pancreas, and bones. Eventually lead to the occurrence of cancer [1]. In addition, thorium can be used as a potential raw material for nuclear fuel, so in terms of environmental protection and energy saving, it is of great significance to separate a...

Claims

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Application Information

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IPC IPC(8): C01B31/04C02F1/28C02F1/62C01B32/198
Inventor 潘宁夏传琴
Owner SICHUAN UNIV
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