Abstract
Nitrogen-enriched graphene-like carbon materials were successfully prepared via pyrolysis of a mixture of melamine, ammonia chloride (NH4Cl) and polyvinyl pyrrolidone (PVP) at a mild temperature without inert gas protection. Different techniques were used to analyze the physical and chemical properties of the products. All the prepared materials showed excellent performance in methylene blue (MB) adsorption, In particular, the materials prepared with 3 g polyvinyl pyrrolidone (PVP) (NCG-2) exhibited the best performance, a very high maximum adsorption capacity of 348.2 mg/g, much larger than many reported materials. The high adsorption capacity of the Nitrogen-doped graphene-like carbon materials was possible due to its uniform porous structure, high specific surface area. Moreover, NCG-2 could be recycled and only a only slightly decreased in the removal efficiency were observed after 5 cycles.
Highlights
Water pollution arisen from dyes has attracted much attention.[1]
When the products were used as adsorbent to adsorb the methylene blue which was known as typical dye pollutant, the carbon material exhibits excellent adsorption performance and recyclability
The aromatic carbon in the polyvinyl pyrrolidone (PVP) could adhere to the g-C3N4 template, forming a layered g-C3N4/PVP structure.[23]
Summary
Water pollution arisen from dyes has attracted much attention.[1]. it is critical to remove dye from wastewater. Carbon-based materials have received more attention due to their high efficiency for dye adsorption and the prevention of secondary pollutants.[10,11,12,13] To further enhance the dye adsorption capacity of carbon materials, preparing carbon materials with large surface area, appropriate pore size or modified surface properties are the main methods used to obtain better dye performance.
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