Synthesis of hexavalent chromium imprinted material on graphene oxide-mesoporous silicon surface and its application in water treatment

A technology of imprinted materials and synthesis methods, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., to achieve the effect of reducing the cost of use

Active Publication Date: 2021-07-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to develop a new material for adsorption and removal of Cr(VI) with large adsorption capacity, high selectivity, short equilibration time and low processing cost and corresponding water treatment technology for some problems existing in existing materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Weigh 3g flake graphite and 18g potassium permanganate, stir and mix, place in a 500mL three-necked flask, and slowly add 400mL of concentrated sulfuric acid and phosphoric acid with a volume ratio of 9:1 in an ice-water bath and strong stirring For the mixed liquid, strictly control the adding speed to prevent the system from reacting too violently to generate purple smoke. The reaction was stirred for 1 h, and the temperature of the reaction liquid was controlled not to exceed 20°C. Then the ice bath was removed, and the mixture was transferred to a constant temperature water bath with a water temperature of 50° C., and stirred for 8 h. Afterwards, the mixture was slowly added to 400 mL of ice water, and transferred to a constant temperature oil bath at 90 °C for 30 min. After the reaction was completed, it was left to cool to room temperature, poured into an equal volume of ultrapure water, and hydrogen peroxide was added dropwise thereinto until no bubbles were...

Embodiment 2

[0030] Carry out various index experiments to the material obtained in Example 1.

[0031] 20 mg of the material obtained in Example 1 was added to 50 mL of solutions containing 50 mg / L Cr(VI) at different pH values, and the influence of pH value on the adsorption effect was investigated. The results showed that the adsorption capacity was the largest when the pH was around 2.

[0032] 20 mg of the material obtained in Example 1 was added to 50 mL of a pH=2 solution containing 50 mg / L, and the effect of adsorption time on the adsorption effect was investigated. The results showed that after 5 minutes, the adsorption reached equilibrium, and the adsorption process obeyed the second-order kinetics.

[0033] 20 mg of the material obtained in Example 1 was added to solutions with different initial concentrations, and adsorbed in a constant temperature oscillator at 25°C for 1 hour, and the variation of the adsorption amount of the material with the initial concentration was studi...

Embodiment 3

[0036] The material obtained in Example 1 was used for the adsorption and removal of Cr(VI) in wastewater.

[0037] Add 20 mg of the material to 50 mL of a solution containing 50 mg / L Cr(VI), adjust the pH to 2-3, and shake at 200 rpm for 30 min. Filter to separate the adsorbent from the solution. The concentration of residual Cr(VI) in the solution was measured by atomic absorption spectrometry, and the removal rate of Cr(VI) was calculated. The Cr(VI) adsorbed by the material is eluted with 0.1M NaOH solution to recover hexavalent chromium.

[0038] The material can be reused 5 times.

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Abstract

The invention belongs to new materials and applications in the field of water treatment, and specifically relates to the preparation of a hexavalent chromium ion imprinted polymer and its application in treating water with hexavalent chromium. Traditional hexavalent chromium adsorption materials have low adsorption capacity, poor selectivity, long time, and are difficult to reuse. Therefore, the present invention prepares a new material for efficiently treating hexavalent chromium in water. The preparation method is: prepare graphene oxide by the improved Hummer method, and then load mesoporous silicon on the surface of graphene oxide to obtain a specific surface area of ​​about 780m 2 / g of graphene oxide-mesoporous silicon composite (GO-MS). With GO‑MS as carrier, hexavalent chromium ion as template, 3‑(2‑aminoethylamino)propyltrimethoxysilane as functional monomer and crosslinking agent, sol‑gel reaction was carried out at room temperature, and hydrogen Sodium oxide solution was used to elute the hexavalent chromium in the product, and then vacuum-dried. The material can selectively adsorb hexavalent chromium, reaching adsorption equilibrium in 30 minutes, with an adsorption capacity of 438 mg / g, and can be reused 5 times.

Description

technical field [0001] The invention belongs to the field of new environmental functional materials and water treatment technology, and specifically relates to the synthesis of a hexavalent chromium imprinted material on the surface of graphene oxide-mesoporous silicon and its application method in water treatment. Background technique [0002] Chromium and its compounds are widely used in electroplating, metallurgy, leather, metal processing and other industries, so the industrial wastewater discharged from these industries contains a large amount of chromium compounds, especially hexavalent chromium. Chromium is a typical heavy metal element, and hexavalent chromium has strong carcinogenic and mutagenic properties. Wastewater containing Cr(VI) will cause potential harm to human health and ecological environment after entering water and soil. Therefore, the hexavalent chromium in industrial wastewater must be treated before it is discharged. The current treatment methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/22
CPCB01J20/268C02F1/285C02F1/288C02F2101/22
Inventor 马晓国黄仁峰李歆郭丽慧谢晓纹张梦圆李景
Owner GUANGDONG UNIV OF TECH
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