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Modification method for removing perfluorocarboxylic acid in water by using reinforced activated carbon and prepared modified activated carbon

A technology of perfluorocarboxylic acid and activated carbon, which is applied in chemical instruments and methods, water pollutants, and other chemical processes. It can solve the problems of harsh high-temperature activation reaction conditions, poor universality, and unrealized harmless treatment of PFCs. problems, to achieve the effect of low equipment requirements and mild reaction conditions

Active Publication Date: 2022-08-02
ZHEJIANG UNIV
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Problems solved by technology

[0004] The Chinese patent document whose publication number is CN112551778A discloses a method for efficiently treating water bodies polluted by perfluorinated compounds, which specifically includes: (1) polluting water containing perfluorinated compounds The water body is mixed with the indole derivative to obtain a mixture of the perfluorinated compound and the indole derivative, wherein the indole derivative is positively charged or neutral in water; the mixture obtained in step (1) is illuminated by a mercury lamp reaction to degrade the perfluorinated compounds in the mixture, but this method is used to specifically treat perfluorooctanoic acid or perfluorooctane sulfonate, and its universality needs to be improved
[0005] The Chinese patent document with the publication number CN111252859A discloses the use of an adsorption medium—highly fluorinated polyvinylidene fluoride filter membrane to realize perfluorinated / polyfluorinated compounds in environmental water The method of rapid removal, the highly fluorinated polyvinylidene fluoride filter membrane has a large diameter, and the sample solution can flow through quickly. Based on the fluorine-fluorine affinity, it has a high adsorption capacity and a good selection for perfluorinated compounds. However, this method only realizes the phase transfer of pollutants, and does not realize the harmless treatment of PFCs
[0006] The Chinese patent document with publication number CN105329976A discloses a method for adsorbing and degrading perfluorinated compounds in water. Alkali activation reaction can effectively expand the pore size of activated carbon, increase the pore volume, and improve the adsorption of activated carbon to perfluorinated compounds, but in this method, the high temperature activation reaction conditions are relatively harsh

Method used

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  • Modification method for removing perfluorocarboxylic acid in water by using reinforced activated carbon and prepared modified activated carbon
  • Modification method for removing perfluorocarboxylic acid in water by using reinforced activated carbon and prepared modified activated carbon
  • Modification method for removing perfluorocarboxylic acid in water by using reinforced activated carbon and prepared modified activated carbon

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Embodiment 1

[0044] The raw coconut shell activated carbon is amorphous carbon, the particle size is 0.15-0.18mm, the pore diameter is 2-50nm, and the micropore volume accounts for 72% of the total pore volume.

[0045] The preparation method of the modified coconut shell activated carbon is as follows: the raw coconut shell activated carbon is placed in a 1.0M NaOH solution for washing for 40min, then taken out and then placed in a 50μM hydriodic acid solution (adjusting the pH value with hydrochloric acid to be equal to 2) for washing for 45min; The pretreated activated carbon was drained (no obvious water droplets dripped), and transferred to a 1 g / L graphene oxide solution (wherein the graphene oxide was a single-layer graphene oxide with an average sheet diameter of 4.5 μm and a thickness of 1.2 nm). , stirred and mixed for 30min, then separated the activated carbon from the solution, and air-dried naturally; put the graphene oxide-loaded activated carbon into the sodium sulfite soluti...

Embodiment 2

[0048] The raw wood activated carbon is amorphous carbon, the particle size is 0.4-0.8mm, the pore diameter is 2-50nm, the micropore volume accounts for 68% of the total pore volume, and the apparent density is 270g / L.

[0049] The preparation method of the modified wood activated carbon is as follows: the raw wood activated carbon is placed in a 1.0M NaOH solution for washing for 40min, taken out and then placed in a 50μM hydriodic acid solution (adjusted to pH 2 with hydrochloric acid) for washing for 45min; Drain the activated carbon (no obvious water droplets dripping), transfer to 1g / L graphene oxide solution (wherein graphene oxide is single-layer graphene oxide, the average sheet diameter is 4.5μm, the thickness is 1.2nm), stirring and mixing for 30min , then separate the activated carbon from the solution and air dry it naturally; put the graphene oxide-loaded activated carbon into 3.0mM sodium sulfite solution, keep the temperature of the reaction solution at 25°C, and...

Embodiment 3

[0052] The raw anthracite activated carbon is amorphous carbon, the particle size is 0.15-0.18mm, the pore diameter is 2-50nm, and the micropore volume accounts for 68% of the total pore volume.

[0053] The preparation method of the modified anthracite activated carbon is as follows: the raw anthracite activated carbon is washed in a 1.0M NaOH solution for 40min, taken out and then placed in a 50μM hydriodic acid solution (adjusted to pH 2 with hydrochloric acid) for washing for 45min; The activated carbon was drained (no obvious water droplets dripped), transferred to 1 g / L graphene oxide solution (wherein graphene oxide was single-layer graphene oxide, the average sheet diameter was 4.5 μm, and the thickness was 1.2 nm), stirring and mixing 30min, then separate the activated carbon from the solution and air-dry it naturally; put the graphene oxide-loaded activated carbon into a 3.0mM sodium sulfite solution, keep the temperature of the reaction solution at 25°C, and turn on ...

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Abstract

The invention discloses a modification method for removing perfluorocarboxylic acid in water by reinforced activated carbon, which comprises the following steps: (1) pretreating activated carbon, the pretreatment process comprising alkali washing and acid washing; (2) transferring the activated carbon pretreated in the step (1) into a graphene oxide solution to prepare graphene oxide loaded activated carbon; and (3) transferring the graphene oxide loaded activated carbon into a sulfite solution or a hydrosulfite solution, reacting under the condition of ultraviolet irradiation, and performing reduction modification to prepare the modified activated carbon. According to the method, the adsorption efficiency of the activated carbon on the perfluorocarboxylic acid is enhanced by regulating the polarity of the surface of the activated carbon, and after the activated carbon is modified by adopting the method, the removal rate of the perfluorocarboxylic acid in water is remarkably increased. The modification method disclosed by the invention is simple and efficient, mild in reaction condition, low in equipment requirement, green and environment-friendly and free from secondary pollution, and the prepared modified activated carbon has a good removal effect on perfluorocarboxylic acid in water.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a modification method for strengthening activated carbon to remove perfluorocarboxylic acid in water and the prepared modified activated carbon. Background technique [0002] Perfluorinated and polyfluorinated compounds (PFCs) are one of the most difficult to degrade organic pollutants. At present, the presence of PFCs has been found in almost all tap water samples in the United States, Japan, Europe and my country, and its concentration is roughly in the range of several to dozens of ng·L -1 about. The ubiquitous presence of PFCs in tap water indicates that conventional feedwater treatment processes (coagulation-precipitation-filtration-chlorine / UV disinfection) cannot effectively "retain" PFCs. Due to the inability of conventional water treatment processes to remove PFCs effectively, and the persistent stability, bioaccumulation and toxicity of PFCs, research on enh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/36C02F101/38
CPCB01J20/20C02F1/283B01J2220/4806C02F2101/36C02F2101/40C02F2101/38Y02W10/37
Inventor 刘小为李可心陈鹏
Owner ZHEJIANG UNIV
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