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

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...

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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

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