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Surface amination modification method of quartz sand filter material for biological sand filter

A technology of surface amination and quartz sand, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the problems of low graft conversion rate and great influence on the grafting process, achieve good dispersion, avoid local agglomeration, and ensure uniformity sexual effect

Pending Publication Date: 2022-04-08
HEBEI UNIV OF ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this high temperature, on the one hand, it is likely to cause hydrolysis of the silane coupling agent before it contacts with the quartz sand and the grafting reaction occurs; Branch conversion rate is low

Method used

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  • Surface amination modification method of quartz sand filter material for biological sand filter
  • Surface amination modification method of quartz sand filter material for biological sand filter
  • Surface amination modification method of quartz sand filter material for biological sand filter

Examples

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Effect test

Embodiment 1

[0038] This embodiment provides a method for surface amination modification of a quartz sand filter material for a biological sand filter, which includes the following steps:

[0039] (1) Pretreatment: take 45g of quartz sand and treat it with acetone, and then soak it in 3M sodium hydroxide solution for 12 hours, so that a large amount of hydroxyl groups are generated on the surface of the quartz sand; take out the quartz sand and rinse it twice with ethanol, and dry it at 60°C. Hydroxylated quartz sand is obtained.

[0040](2) Prepare the grafting agent solution: mix n-butanol: ammonia water (28wt%): pure water in a volume ratio of 8:1:1, and disperse ultrasonically for 20 minutes to obtain 30 mL of mixed solvent; add 1 mg of polyethylene glycol to the mixed solvent Alcohol (molecular weight is 4000), after fully stirring 30min, add 9g silane coupling agent KH550 again, continue to stir, make grafting agent solution;

[0041] (3) Graft modification: mix the hydroxylated qua...

Embodiment 2

[0047] This embodiment provides a method for surface amination modification of a quartz sand filter material for a biological sand filter, which includes the following steps:

[0048] (1) Pretreatment: take 45g of quartz sand and treat it with acetone, and then soak it in 10M sodium hydroxide solution for 10 hours, so that a large amount of hydroxyl groups are generated on the surface of the quartz sand; take out the quartz sand and rinse it twice with ethanol, and dry it at 60°C. Hydroxylated quartz sand is obtained.

[0049] (2) Prepare the grafting agent solution: mix n-butanol: ammonia water (30wt%): pure water in a volume ratio of 8:1:1, and disperse ultrasonically for 20 minutes to obtain 35 mL of mixed solvent; add 1.2 mg of polyethylene glycol to the mixed solvent Diol (molecular weight is 4000), after fully stirring 30min, add 9g silane coupling agent KH550 again, continue to stir, make grafting agent solution;

[0050] (3), grafting modification: mix the hydroxylate...

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Abstract

The invention relates to a surface amination modification method of a quartz sand filter material for a biological sand filter, which comprises the following steps: S1, treating quartz sand with acetone, and soaking with a sodium hydroxide solution to generate a large amount of hydroxyl groups on the surface of the quartz sand; the quartz sand is taken out, washed with ethyl alcohol and dried at the temperature smaller than or equal to 60 DEG C, and hydroxylated quartz sand is obtained; s2, mixing n-butyl alcohol and / or ethanol, ammonia water and purified water according to the volume ratio of (7-9): (0.8-1.2): (0.8-1.2), and performing ultrasonic dispersion to obtain a mixed solvent; adding polyethylene glycol into the mixed solvent, fully stirring, and then adding a silane coupling agent to prepare a grafting agent solution; and S3, mixing the hydroxylated quartz sand with the grafting agent solution, carrying out a constant-temperature reaction at 40-55 DEG C for 2.5-4 h, taking out the quartz sand after the reaction is finished, washing the quartz sand with water and ethanol, and drying the quartz sand to prepare the surface amination modified quartz sand filter material. The reaction solvent is non-toxic, the reaction temperature is low, the amination grafting rate is high, the modified quartz sand is good in dispersity, the reaction time is short, and batch production of the amino modified quartz sand filter material is facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of biological filter materials, in particular to a method for surface amination modification of quartz sand filter materials for biological sand filters. Background technique [0002] The filtration efficiency of the filter depends mainly on the filter material. Among many modified filter materials, quartz sand has the highest removal rate of organic matter and the shortest adsorption time. The US EPA has proposed quartz sand as an emerging filter technology for arsenic removal in water utilities. In addition, quartz sand is widely used in the field of water pollution treatment due to its stable physical and chemical properties, biocompatibility and surface modification. [0003] However, when quartz sand is directly used as the filter material of biological sand filter, it also has certain shortcomings. This is mainly because the surface energy of quartz sand is high, easy to agglomerate, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12
Inventor 唐锋兵李思敏王栋母静波张卉萱
Owner HEBEI UNIV OF ENG
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