Preparation of carbon quantum dots from ionic liquid modified biomass for the detection of Fe and Pd in environmental water.

A new type of green carbon quantum dots (ILB-CQDs) was prepared by hydrothermal method using ionic liquid as a modifier and grape skin as carbon source, and was obtained from hydrogen-bonded lattice structure ionic liquid preparation, which makes the CQDs in a ring-like stable structure with a stability period of more than 90 day. There is also the catalytic effect of the ionic liquid on cellulose, which makes the prepared CQDs show good advantages, such as uniform particle size, high quantum yield (26.7%), and very good fluorescence performance. This is a smart material for the selective detection of Fe and Pd. It has a detection limit of 0.001 nM for Fe and 0.23 µM for Pd in pure water. It has a detection limit of 3.2 nmol/L for Fe and 0.36 µmol/L for Pd in actual water, both of which meet the requirements of WHO drinking water standards. And there is to achieve more than 90% of water restoration effect.