Adsorbent for treating hexavalent chromium in neutral wastewater and preparation method of adsorbent

An adsorbent, hexavalent chromium technology, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., to achieve low cost, good regeneration performance, simple and convenient treatment

Active Publication Date: 2019-01-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art that the adsorption effect is good under acidic conditions and hardly adsorbed under neutral and alkaline conditions, one of the purposes of the present invention is to provide a kind of adsorbent for treating hexavalent chromium in neutral wastewater. The pH of the adsorbent is widely applicable, the price is low, and the raw materials are easy to obtain

Method used

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  • Adsorbent for treating hexavalent chromium in neutral wastewater and preparation method of adsorbent
  • Adsorbent for treating hexavalent chromium in neutral wastewater and preparation method of adsorbent
  • Adsorbent for treating hexavalent chromium in neutral wastewater and preparation method of adsorbent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The quality of tetramethylmethanediamine is 1 g, the quality of bromododecane is 5.5 g, dimethylformamide is used as solvent 3 mL, and the reaction temperature is 80 o C, reaction time 12 h; recrystallize three times with ethanol-ethyl acetate to obtain product I; dissolve product I in ethyl acetate and 20 mL, react with 3mol / L NaOH solution, wash with deionized water several times until neutral; continue and 20 mL, 4mol / L of HNO 3 reaction, washed with deionized water several times to neutrality, and obtained functionalized reagent I with a mass of 5.1 g; the desired structure was detected by NMR (see attached figure 1 ).

Embodiment 2

[0034] 0.5 g of functionalization reagent I was dissolved in acetone, 1 g of GO was ultrasonically dispersed in it, 25 o C stirred for 10 h, centrifuged, washed with deionized water, 60 o C vacuum drying for 12 h to obtain the functionalized graphene oxide I adsorbent, which was successfully loaded by infrared detection (see attached image 3 ), calculated according to the above method, the adsorption rate of Cr(VI) at pH=2-9 is greater than 96%, as shown in the following table:

[0035] pH

Embodiment 3

[0037] The quality of tetramethylmethanediamine is 1 g, the quality of bromoheptane is 4.3 g, 4 mL of acetonitrile is used as solvent, and the reaction temperature is 75 o C, reaction time 10 h; recrystallize three times with ethanol-ethyl acetate to obtain product II; dissolve product II in ethyl acetate and react with 20 mL, 3mol / L NaOH solution, wash with deionized water several times until neutral; continue and 20 mL, 4mol / L of HNO 3reaction, washed with deionized water several times until neutral, and obtained functionalized reagent II with a mass of 3.2 g; 0.5 g functionalized reagent II was dissolved in acetone, 1.0 g of GO was ultrasonically dispersed in it, and 30 o C stirred for 12 h, centrifuged, washed with deionized water, 60 o C was vacuum dried for 12 h to obtain functionalized graphene oxide II adsorbent, and the adsorption rate of Cr(VI) was calculated as 97.2% according to the above method.

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Abstract

The invention discloses an adsorbent for treating hexavalent chromium in neutral wastewater and a preparation method of the adsorbent, which belong to the field of sewage treatment and environmental protection. A structural formula of the adsorbent for treating hexavalent chromium in neutral wastewater is N4O6CXH2X+1-GO, wherein X is greater than or equal to 15, and smaller than or equal to 37, and X is a positive integer. Graphene oxide (GO) is firstly synthesized, and is further subjected to functional treatment, so that a functional graphene oxide adsorbent is obtained. The prepared adsorbent is great in specific surface area, is good in selectivity, and is high in adsorption efficiency; and adsorption rate for Cr (VI) is greater than 96% when the pH value is within the range of 2-9. The preparation method of the adsorbent for treating hexavalent chromium in neutral wastewater has the advantages of low reaction temperature, short time, simple purifying and high operability.

Description

technical field [0001] The invention relates to an adsorbent for treating hexavalent chromium in neutral wastewater and a preparation method thereof, belonging to the scope of industrial sewage treatment. Specifically, the functionalized graphene oxide adsorbent is used to treat the hexavalent chromium produced in the process of industrial production under neutral conditions. Wastewater containing Cr(VI) makes it meet the national discharge standard for Cr(VI). Background technique [0002] With the rapid development of industry, the heavy metal pollution produced in production processes such as tanning, electroplating, and pigment manufacturing has caused great harm to the environmental balance and human health. In heavy metal pollution such as lead, mercury, cadmium, cobalt, and chromium, chromium is mainly used in tanning, metallurgy, paint, printing and dyeing and other fields. There are mainly two valence states of Cr(III) and Cr(VI) in nature, and Cr(III) is an essent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/22B01J20/28057C02F1/283C02F1/285C02F2101/22
Inventor 孙国新靳丽敏梁帅段显南
Owner UNIV OF JINAN
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