Overlooked interaction between redox-mediator and bisphenol-A in permanganate oxidation

Research efforts on permanganate(Mn(VII))combined with redox-mediator(RM),have received increasing attention due to their significant performance for bisphenol-A(BPA)removal.However,the mechanisms underpinning BPA degradation remain underexplored.Here we show the overlooked interactions between RM and BPA during permanganate oxidation by introducing an RMdN-hydroxyphthalimide(NHPI).We discovered that the concurrent generation of MnO_(2) and phthalimide-N-oxyl(PINO)radical significantly enhances BPA oxidation within the pH range of 5.0e6.0.The detection of radical cross-coupling products between PINO radicals and BPA or its derivatives corroborates the pivotal role of radical cross-coupling in BPA oxidation.Intriguingly,we observed the formation of an NHPI-BPA complex,which undergoes preferential oxidation by Mn(VII),marked by the emergence of an electronrich domain in NHPI.These findings unveil the underlying mechanisms in the Mn(VII)/RM system and bridge the knowledge gap concerning BPA transformation via complexation.This research paves the way for further exploration into optimizing complexation sites and RM dosage,significantly enhancing the system's efficiency in water treatment applications.

An all-biomaterials-based aqueous binder based on adsorption redox-mediated synergism for advanced lithium–sulfur batteries

The complex multistep electrochemical reactions of lithium polysulfides and the solid–liquid–solid phase transformation involved in the S8 to Li2S reactions lead to slow redox kinetics in lithium–sulfur batteries(Li–S batteries).However,some targeted researches have proposed strategies requiring the introduction of significant additional inactive components,which can seriously affect the energy density.Whereas polymer binders,proven to be effective in suppressing shuttle effects and constraining electrode volume expansion,also have promising potential in enhancing Li–S batteries redox kinetics.Herein,a novel aqueous polymer binder is prepared by convenient amidation reaction of fully biomaterials,utilizing its inherent rich amide groups for chemisorption and redox mediating ability of thiol groups to achieve adsorption redox-mediated synergism for efficient conversion of polysulfides.Li–S batteries based on N-Acetyl-L-Cysteine-Chitosan(NACCTS)binder exhibit high initial discharge specific capacity(1260.1mAhg−1 at 0.2C)and excellent cycling performance over 400 cycles(capacity decay rate of 0.018%per cycle).In addition,the batteries exhibit great areal capacity and stable capacity retention of 83.6%over 80 cycles even under high sulfur loading of 8.4mgcm−2.This work offers a novel perspective on the redox-mediated functional design and provides an environmentally friendly biomaterials-based aqueous binder for practical Li–S battery.