A recyclable 3D g-C3N4 based nanocellulose aerogel composite for photodegradation of organic pollutants

摘要

It is difficult to recycle photocatalysts for water purification when they are in aqueous suspension. Cellulose aerogels with porous structure and biodegradability are promising carriers for photocatalysts that can be used to solve many environmental problems. In this study, a 3D recyclable g-C3N4@cellulose aerogel for photocatalytic degradation of pollutants was synthesized using a facile chemical cross-linking method. g-C3N4@cellulose aerogel (30% loading) exhibited excellent photocatalytic activity up to 99.0% degradation. In addition, the g-C3N4@cellulose aerogel exhibited high recyclability and structural stability while the photocatalytic efficiency is not significantly reduced in cycling tests. The photocatalyst was optimized using high temperature calcination, resulting in 95.35 m(2) g(-1) actual surface determined from Brunner-Emmet-Teller measurements. Therefore, aggregation of the photocatalyst can be avoided by the cellulose aerogel support whilst the photocatalytic property remained as efficient as its powder form. Such composites may become attractive material for practical applications.