Preparation of ionic liquid modified magnetic graphene oxide composite material and method for removing As(III) and As(V) in water

An ionic liquid and composite material technology, which is applied in the treatment of water samples containing arsenic (As), and the synthesis field of ionic liquid-modified magnetic graphene oxide composite materials, can solve the problems of poor adsorption effect, long time, difficult separation and the like, To achieve the effect of convenient recycling, short time and good dispersibility

Inactive Publication Date: 2018-12-28
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional trivalent arsenic and pentavalent arsenic adsorption materials have poor adsorption effects, take a long time, and are not easy to separate from water.

Method used

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  • Preparation of ionic liquid modified magnetic graphene oxide composite material and method for removing As(III) and As(V) in water
  • Preparation of ionic liquid modified magnetic graphene oxide composite material and method for removing As(III) and As(V) in water
  • Preparation of ionic liquid modified magnetic graphene oxide composite material and method for removing As(III) and As(V) in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Place a 500mL three-hole round bottom flask in a water bath at a temperature 2 SO 4 230mL with constant stirring. Then add 1.5g sodium nitrate NaNO 3 . Slowly add 5g of graphite powder and 35g of potassium permanganate successively. Mix and stir to make it fully dissolved for 2h. Then heated to 35°C, continued to stir for 2h, then slowly added 230mL of deionized water (45min), at this time the temperature rose naturally. The temperature was maintained at 98° C. for 2 h. Then remove the heat source and let it cool naturally. Pour the solution into a beaker, add 420 mL of deionized water and 2 mL of 30% H 2 o 2 . After standing overnight, suck out the supernatant, put the precipitate in a centrifuge tube, centrifuge (8000r / min, 5min) with a centrifuge, and then wash with dilute 10-fold hydrochloric acid until the supernatant does not react with sodium hydroxide. Formation of a black precipitate proves clean. After washing with acetone solution, it was dried...

Embodiment 2

[0034] Under different initial solution pH values, the adsorption amount of As(III) and As(V) in the solution by the ionic liquid modified magnetic graphene oxide composite material was compared, and the specific steps were as follows:

[0035] 20 mg of the material obtained in Example 1 was added to 50 mL of solutions containing 50 mg / L As(III) and As(V) at different pH values, and the influence of pH value on the adsorption effect was investigated. The results show that the adsorption amount of As(III) is the largest at about pH 9, and the adsorption amount of As(V) is the largest at about pH 2. However, under strong acid and alkaline conditions, a small amount of Fe in the material will be precipitated, so the pH setting in the actual treatment for 7.

Embodiment 3

[0037] The adsorption amount of As(III) and As(V) in the solution by the ionic liquid modified magnetic graphene oxide composite material under different adsorption time conditions was compared, and the specific steps were as follows:

[0038] Add 20 mg of the material obtained in Example 1 to 50 mL of pH=7 solution containing 50 mg / L As(III) and As(V), shake at 25°C (200 rpm), and the adsorption time is: 1, 2, 5 , 8, 10, 15, 20, 30, 45, 60, 90min. The results showed that after 30 min, the adsorption reached equilibrium, and the adsorption process obeyed the second-order kinetics.

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Abstract

The invention discloses preparation of an ionic liquid modified magnetic graphene oxide (MGO) composite material and a method for adsorbing and removing trivalent arsenic As(III) and pentavalent arsenic As(V) in water. The traditional trivalent arsenic and pentavalent arsenic adsorbing materials are poor in adsorption effect and long in time and are difficultly separated from water. The preparation method disclosed by the invention comprises the following steps: preparing the MGO by a common method, performing ultrasonic mixing on [BMIM] [PF6] and the MGO, washing and drying after reaction completion, thereby obtaining the magnetic graphene oxide-ionic liquid composite material. The preparation method is simple and convenient. The material has large specific surface area of magnetic graphene oxide, the characteristic of superparamagnetism and excellent characteristics of the ionic liquid, has excellent dispersion property in water, and is easily separated from water by virtue of an applied magnetic field. The maximal adsorption capacity of the trivalent arsenic and pentavalent arsenic respectively reaches 155.65mg / L and 149.25mg / L, the equilibrium time is only 30 minutes, the material can be repeatedly utilized for 5 times, and the anti-jamming capability is high. The method can be used for removal and recycle of arsenic in arsenic-containing wastewater and separation and enrichment of trace trivalent arsenic and pentavalent arsenic in the water.

Description

technical field [0001] The invention belongs to the field of new environmental functional materials and water treatment technologies, and specifically relates to the synthesis of an ionic liquid-modified magnetic graphene oxide composite material and its application in the treatment of arsenic (As(III), As(V)) water samples Methods. Background technique [0002] In surface waters, arsenic generally exists as As(III) and As(V), and small amounts of methyl and dimethylarsenic can also be present in groundwater sources. There are generally three sources of arsenic pollution: industrial activities: industrial waste water and waste gas, and discharge of waste residues. Mining and smelting of arsenic-containing raw ores; agricultural activities: mainly the extensive use of arsenic-containing pesticides; natural phenomena: volcanic eruptions and rock weathering will produce arsenic-containing substances. In daily life, As(III) and As(V) are highly toxic and carcinogenic. The wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/20B01J20/22B01J20/28009C02F1/288C02F2101/103
Inventor 马晓国张梦圆李景
Owner GUANGDONG UNIV OF TECH
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