Visible photocatalysis renewable graphene-based hydrogel adsorbent, and preparation method and application thereof

Abstract

The invention discloses a silver phosphate supported graphene-based hydrogel adsorbent, and a preparation method and an application thereof. The method comprises the following steps: carrying out ultrasonic peeling on an aqueous graphene oxide solution, adding glutathione, maintaining the above obtained glutathione-containing graphene solution under sealing conditions at 80DEG C for 12h to obtain a glutathione-containing graphene-based hydrogel, immersing the glutathione-containing graphene-based hydrogel in distilled water to remove residual glutathione, adding an aqueous AgNO3 solution into the glutathione-containing graphene-based hydrogel, and reacting to obtain an Ag ion supported hydrogel; and adding an aqueous NaH2PO4 solution, and reacting to obtain the silver phosphate supported graphene-based hydrogel adsorbent which can be used for treatment of methyl orange-containing dye wastewater. The adsorbent has greatly larger methyl orange adsorption ability than graphene, and can be recycled through photocatalysis regeneration after use. The methyl orange adsorption ability of the adsorbent used three times still reaches 405.316-514.553mg / g.

Description

technical field [0001] The invention relates to the field of nanomaterials and environmental science and technology, in particular to a graphene-based hydrogel adsorbent loaded with silver phosphate and its preparation method and application. Background technique [0002] The wastewater produced in the process of dye production and use contains a variety of refractory biological toxicity. With the rapid development of chemical industry, papermaking, printing and dyeing industry, the pollution of dye wastewater is becoming more and more serious. Among them, azo dyes are relatively common. Azo dyes are mostly formed by coupling aromatic amines with active methylene compounds, phenols, and aromatic amines after diazotization. Their chemical properties are stable and biodegradable. It is easy to accumulate in the environment and cause harm to the human body and the entire ecosystem. Azo dye wastewater has poor biochemical properties, high chroma, and complex components. Azo dy...

AI Technical Summary

Problems solved by technology

Among them, azo dyes are relatively common. Azo dyes are mostly formed by coupling aromatic amines with active methylene compounds, phenols, and aromatic amines after diazotization. Their chemical properties are stable and biodegradable. Low, easy to accumulate in the environment and cause harm to the human body and the entire ecosystem

Azo dye wastewater has poor biodegradability, high chroma, complex components, and azo dyes that are easily decomposed into carcinogenic aromatic amines under reducing conditions have been banned in developed countries

At present, there is no economical and effective water treatment method at home and abroad, which also causes high residues of azo dyes in the treated wastewater, which has aroused people's strong concern and concern