Polydopamine-coated silica gel modified by polyethylene polyamine, method for preparing polydopamine-coated silica gel modified by polyethylene polyamine and application of polydopamine-coated silica gel modified by polyethylene polyamine

A polyvinylpolyamine and polydopamine technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., to achieve the effects of firm bonding, large adsorption capacity and good stability

Inactive Publication Date: 2017-12-29
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the treatment targets of most PDA adsorbents are mainly heavy metals and cationic dyes, and there is no information on the use of three different chain lengths of linear polyethylene polyamines, such as diethylenetriamine (DETA), triethylenetetramine ( TETA) and tetraethylenepentamine (TEPA), modified polydopamine-coated silica gel by one-step method, and used it to adsorb anionic dyes

Method used

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  • Polydopamine-coated silica gel modified by polyethylene polyamine, method for preparing polydopamine-coated silica gel modified by polyethylene polyamine and application of polydopamine-coated silica gel modified by polyethylene polyamine
  • Polydopamine-coated silica gel modified by polyethylene polyamine, method for preparing polydopamine-coated silica gel modified by polyethylene polyamine and application of polydopamine-coated silica gel modified by polyethylene polyamine
  • Polydopamine-coated silica gel modified by polyethylene polyamine, method for preparing polydopamine-coated silica gel modified by polyethylene polyamine and application of polydopamine-coated silica gel modified by polyethylene polyamine

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1 Preparation of polydopamine-coated silica gel SG@DETA / PDA modified by diethylenetriamine

[0019] (1) Activation of silica gel: place the silica gel in a nitric acid solution with a volume concentration of 50% for 12 h, wash it with deionized water until it is neutral, and dry it; After washing with deionized water until neutral, vacuum-dry at 60°C for 12 h, and set aside;

[0020] (2) Synthesis of polyethylene polyamine-modified polydopamine-coated silica gel: disperse 0.2 g of activated silica gel in 200 mL of Tirs-HCl buffer solution with pH=8.5, stir for 5 min, then add 0.4 g of dopamine hydrochloride and 6 mmol Diethylenetriamine (DETA) was slowly stirred at 25 °C for 24 h, and the product was centrifuged and washed with distilled water, then dried in vacuum at 55 °C to obtain SG@DETA / PDA.

Embodiment 2

[0021] Example 2 Preparation of triethylenetetramine-modified polydopamine-coated silica gel SG@TETA / PDA

[0022] The diethylenetriamine added in step (2) of Example 1 was replaced with triethylenetetramine (TETA), and other operations were carried out as in Example 1 to obtain SG@TETA / PDA.

Embodiment 3

[0023] Example 3 Preparation of tetraethylenepentamine-modified polydopamine-coated silica gel SG@TEPA / PDA

[0024] The diethylenetriamine added in step (2) of Example 1 was replaced with tetraethylenepentamine (TEPA), and other operations were carried out according to Example 1 to obtain SG@TEPA / PDA.

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Abstract

The invention discloses polydopamine-coated silica gel modified by polyethylene polyamine, a method for preparing the polydopamine-coated silica gel modified by the polyethylene polyamine and application of the polydopamine-coated silica gel modified by the polyethylene polyamine, and belongs to the field of preparation of adsorption materials. The method particularly includes activating silica gel; coating the silica gel with polydopamine; modifying polydopamine-coated silica gel by the polyethylene polyamine by the aid of the polydopamine which is used as a bridge. The polydopamine-coated silica gel modified by the polyethylene polyamine, the method and the application have the advantages that a large quantity of amine is led into the polydopamine-coated silica gel, accordingly, the content of active groups in the polydopamine-coated silica gel modified by the polyethylene polyamine can be increased, the adsorption performance of the polydopamine-coated silica gel modified by the polyethylene polyamine can be improved, and the polydopamine-coated silica gel modified by the polyethylene polyamine can be used as an adsorbent for dye in environmental water samples and particularly can be used for adsorbing anionic dye.

Description

technical field [0001] The invention belongs to the field of adsorption material preparation, and in particular relates to polydopamine-coated silica gel modified by polyethylene polyamine and its preparation method and application. Background technique [0002] Dye wastewater is one of the main sources of water pollution, which mainly comes from wastewater discharge from papermaking, printing, textile and other factories. Synthetic dyes and their derivatives have hazards such as refractory degradation, high chroma and pathogenicity, which seriously affect environmental safety and human health. At present, the methods for treating dye wastewater mainly include coagulation sedimentation, biological method, adsorption, photodegradation and membrane separation. Among them, adsorption is widely used in wastewater treatment due to its advantages of low energy consumption, high efficiency, and simple operation. [0003] At present, the materials commonly used to adsorb dyes main...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/38C02F101/34C02F101/30
CPCB01J20/103B01J20/265C02F1/288C02F2101/308C02F2101/34C02F2101/38C02F2101/40
Inventor 吕海霞凌云霞飞于岩
Owner FUZHOU UNIVERSITY
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