Preparation method and application of clay/tannic acid/metal ion composite material for efficient adsorption of antibiotics

Patent metadata

Field	Value
Publication number	US-12054404-B2
Application number	US-202318511968-A
Country	US
Kind code	B2
Filing date	Nov 16, 2023
Priority date	Oct 22, 2021
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A preparation method and an application of a clay/tannic acid/metal ion composite material for efficient adsorption of antibiotics are provided, which relate to the field of water environment treatments. A clay/tannic acid/metal ion composite adsorbent is prepared, preparation method and operation process are simple, synthesis time is short, and yield is large. A raw material used is tannic acid, which has a wide range of sources, is non-toxic, biodegradable, and has no risk of secondary pollution, due to abundant phenolic hydroxyl groups in tannic acid, the tannic acid can not only chelate with the metal ions, but also adsorb pollutants from water, when combined with the clay and the metal ions, a composite body is formed, which has a rougher surface, and adsorption active sites are increased, thereby effectively increasing adsorption, and improving an adsorption performance for pollutants. The clay/tannic acid/metal ion composite adsorbent has good adsorption effect for antibiotics.

First claim

What is claimed is:

1. A method of preparing a kaolin clay/tannic acid/titanium ion composite adsorbent comprising:
1(a) adding 2 g of kaolin clay into a buffer solution selected from the group consisting of tri hydroxymethyl aminomethane (C 4 H 11 NO 3 ) buffer solution and 3-morpholinopropanesulfonic acid (C 7 H 15 NO 4 S) buffer solution to obtain a mixture, and
1(b) ultrasonically dispersing the mixture to obtain a kaolin dispersion; and
2(a) adding equal measures of a 10 mmol/L tannic acid solution and a 40 mmol/L titanium ion solution to the kaolin dispersion to obtain a mixed solution, wherein the weight ratio of tannic acid added to kaolin is 1:1;
2(b) adjusting the pH of the mixed solution to 7.5 to obtain an alkaline mixed solution,
2(c) reacting the alkaline mixed solution at room temperature for 1 min to obtain a reacted solution, and
2(d) sequentially filtering, washing and drying the reacted solution to obtain the kaolin clay/tannic acid/titanium ion composite adsorbent.

2. The method of claim 1 , wherein the drying is conducted at room temperature or by freeze-drying.

3. A method of adsorbing an antibiotic compound from sewage comprising:
adding the kaolin clay/tannic acid/titanium ion composite adsorbent made by the method of claim 1 to sewage comprising the antibiotic compound; and
adsorbing the antibiotic compound onto the composite adsorbent.

4. The method of claim 3 , wherein the antibiotic compound is selected from the group consisting of sulfonamides, fluoroquinolones, tetracyclines, β-lactams and macrolides.

Assignees

• Nanjing University
• Quanzhou Institute For Environmental Protection Industry Nanjing Univ

Inventors

• Yang Hu
• Chang Qianqian

Classifications

• C02F2101/40

  containing sulfur · CPC title

• C02F2101/38

  containing nitrogen · CPC title

• B01J20/3078

  Thermal treatment, e.g. calcining or pyrolizing · CPC title

• B01J20/24 Primary

  Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives · CPC title

• B01J20/12

  Naturally occurring clays or bleaching earth · CPC title