The complicated structured dyes produced by the textile industry have become a serious problem in the last few decades, which can be attributed to their stable chemical structures and difficult to degrade. Therefore, in this article, we described a method to fix dye macromolecules by flocculation process and then transform the colloid to N, S, Cl-doped porous carbon materials. This material can effectively improve the capacity and cycle stability of lithium ion batteries, and recycle the dyes in the water. The N, S, Cl-doped porous carbon materials show a superior electrocatalytic performance of 473.5 mAhg −1 at the current density of 100 mAg −1 after 60 cycles. The present work combines the lithium ion batteries with dyes waste treatment and has a broad prospect for development.
In this work, humic acid-based sulfur-chlorine-doped carbon quantum dots (L-CQDs) were synthesized by using a polyethylene glycol (PEG)-assisted hydrothermal technique using landfill leachate concentrate (LLC) as a carbon source. The prepared L-CQDs contain many oxygen-containing functional groups on the surface with a small average particle size of 4–6 nm, resulting in excellent hydrophilicity and dispensability. The three-dimensional fluorescence spectrum shows that the characteristic peak for humic acid for LLC is redshifted after adding PEG as an inactivator, indicating that L-CQDs are synthesized by PEG encapsulation and linkage. The optimum condition for preparing L-CQDs involves the addition of 0.5 g PEG (MW = 2000) into 20 mL LLC and reaction at 200 °C for 5 h, with the optimal L-CQD quantum yield reaching 5.32%. L-CQDs were used to prepare fluorescent nanoprobes for the detection of palladium ions (Pd 2+ ). The obtained nanoprobe shows admirable performance in detecting Pd 2+ , with high selectivity , excellent water solubility and stability. The fluorescence intensity of the nanoprobe is selectively quenched through static quenching by Pd 2+ in the concentration range of 5–40 μmol L −1 . This work provides a simple, easy, and fast detection method for Pd 2+ and opens up a way for the resource utilization of LLC.
危险品化学品经营许可证（带存储）