Method for removing hexavalent molybdenum in water

A technology of aqueous solutions and derivatives, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve problems such as high operating costs, secondary pollution, and difficult operation

Active Publication Date: 2015-01-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the disadvantages of existing methods for removing hexavalent molybdenum in water that are easy to cause secondary pollution, difficult to operate, and high in operating costs, one of the purp

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  • Method for removing hexavalent molybdenum in water
  • Method for removing hexavalent molybdenum in water
  • Method for removing hexavalent molybdenum in water

Examples

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Embodiment 1

[0079] A method for removing hexavalent molybdenum in water comprises the steps:

[0080] (1) Disperse graphite oxide powder in ultrapure water to obtain a graphite oxide dispersion with a concentration of 1.5 mg / mL, ultrasonicate in a water bath for 2 hours, and ultrasonic power 150W to obtain a graphene oxide dispersion;

[0081] (2) Add a small amount of ammonia water to the graphene oxide dispersion obtained in step (1), adjust the pH to 10, and add hydrazine hydrate to the dispersion for 10 minutes for ultrasonic dispersion according to the ratio of hydrazine to graphite oxide mass ratio of 7:10 , mixed evenly to obtain a mixed dispersion; keep the mixed dispersion in a water bath at 95 ° C, magnetically stir at 300 rpm, and carry out a reflux reaction for 24 hours; use a high-speed centrifuge to separate the solid product, and wash and centrifuge it with ultrapure water several times. ℃ drying to obtain the reduced graphene oxide material;

[0082] (3) The PZC of the re...

Embodiment 2

[0091] A method for removing hexavalent molybdenum in water comprises the steps:

[0092] (1) Disperse the graphite oxide powder in ultrapure water to obtain a 1mg / ml graphite oxide aqueous dispersion, and ultrasonically treat it in a water bath for 2 hours with an ultrasonic power of 150W to obtain a graphene oxide dispersion;

[0093] (2) Disperse p-phenylenediamine in ethanol to obtain a 3mg / ml ethanol dispersion of p-phenylenediamine, mix the graphene oxide dispersion and p-phenylenediamine ethanol dispersion in equal volumes, and ultrasonically mix for 30 minutes to obtain Mix the dispersion; heat the mixed solution in a water bath at 95°C, magnetically stir at 300rpm, and reflux for 24 hours; use a high-speed centrifuge to separate the solid product, wash and centrifuge it with ultrapure water several times, and dry it at 55°C to obtain the amination oxidation Graphene derivative materials;

[0094] (3) The PZC of the aminated graphene oxide derivative material obtained...

Embodiment 3

[0104] A method for removing hexavalent molybdenum in water comprises the steps:

[0105] (1) Disperse graphite oxide in a solvent, ultrasonically treat it in a water bath for 0.5 h, and prepare a graphene oxide dispersion with a concentration of 5 mg / mL;

[0106] (2) Add ammonia water (1000 times the mass of graphene oxide) to the graphene oxide dispersion prepared in step (1), and ultrasonically disperse in a water bath for 5 minutes to obtain a mixed dispersion; put the mixed dispersion in a condensed reflux In the round-bottom flask of the tube, stir and reflux for 36 hours, and keep the temperature of the water bath at 95°C; after the reaction is completed, the solid obtained by centrifugation is the reaction product, washed with lotion, and dried at 25°C to obtain the reduced graphene oxide material;

[0107] (3) The PZC of the reduced graphene oxide material obtained in step (2) is about 4, which is about 1 higher than the PZC3 of graphene oxide by the batch equilibriu...

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Abstract

The invention relates to a method for removing hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water is characterized in that electrostatic adsorption effect of a graphene oxide derivative material to the hexavalent molybdenum is utilized for removing the hexavalent molybdenum in water. The method for removing the hexavalent molybdenum in water has the advantages that the graphene oxide derivative material is positively charged by regulating the pH value of a mixed solution of the graphene oxide derivative material and the hexavalent molybdenum, electrostatic adsorption is carried out between the graphene oxide derivative material and a negatively charged hexavalent molybdenum material, so as to remove the hexavalent molybdenum, and graphene oxide derivative has large specific surface area, good hydrophilcity, rich surface active sites and high adsorption capacity, so that the method for removing the hexavalent molybdenum in water has good effect and high efficiency.

Description

technical field [0001] The present invention relates to a method for removing hexavalent molybdenum in water, and further relates to a method for adsorbing heavy metal molybdenum (especially hexavalent molybdenum) by using graphene oxide derivative materials, in particular to a method of designing the surface charge of graphene materials It is a method to adsorb and remove heavy metal molybdenum (especially hexavalent molybdenum) in aqueous solution. Background technique [0002] Molybdenum is a component of aldehyde oxidase, xanthine oxidase / dehydrogenase and sulfite oxidase. It is an essential trace element for the human body, animals and plants, and plays an important role in physiological processes. However, excessive intake of molybdenum, It can cause poisoning to humans and animals, hinder the energy metabolism process in the body, and cause damage or disease to organs or tissues such as the heart, kidney, esophagus, and skin; studies have shown that excessive molybden...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/28
CPCC02F1/285C02F1/62
Inventor 刘晨明李明杰曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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