Mechanistic insights into surface catalytic oxidation of fluoroquinolone antibiotics on sediment mackinawite.

Fluoroquinolone antibiotics (FQs) have been widely detected in the sediments due to vast production and consumption. In this study, the transformation of FQs was investigated in the presence of sediment mackinawite (FeS) under ambient conditions. Moreover, the role of dissolved oxygen was evaluated for the enhanced degradation of FQs induced by FeS.

Structure-dependent surface catalytic degradation of cephalosporin antibiotics on the aged polyvinyl chloride microplastics.

Microplastics (MPs) have been recognized as a global concern due to their potential health effect, as MPs could adsorb and carry various pollutants in aquatic environment. In the present study, a new environmental behavior related to polyvinyl chloride microplastics (PVC-MPs) and the underlying mechanism were described. Our results showed that the photo-aged PVC-MPs could affect the transformation of cephalosporin antibiotics.

Sheet-on-sheet TiO/BiMoO heterostructure for enhanced photocatalytic amoxicillin degradation.

Developing sheet-on-sheet (2D/2D) heterostructure with built-in electric field (BIEF) is effective in boosting the performance of photocatalysts for emerging contaminants degradation. Herein, the 2D/2D microtopography and (-)TiO/(+)BiMoO BIEF were precisely integrated into hierarchical nanosheets, which can provide the basis and driving force for charge transfer both in in-plane and interface of heterojunction. The prepared photocatalyst (TiO/BiMoO) showed high-efficiency and stable performance for photocatalytic amoxicillin (AMX) degradation, which was 18.

Enhanced alteration of poly(vinyl chloride) microplastics by hydrated electrons derived from indole-3-acetic acid assisted by a common cationic surfactant.

In this study, a new photo-irradiated reductive dechlorination pathway and the underlying transformation mechanism are described for poly(vinyl chloride) microplastics (PVC-MPs). PVC-MPs underwent photo-reductive dechlorination process with the release of chloride ions. This reaction could be facilitated in the presence of indole-3-acetic acid (IAA) and hexadecyltrimethylammonium bromide (CTAB) under neutral pH and simulated sunlight irradiation conditions.

Application of Fe-TAML/HO system for treatment of fluoroquinolone antibiotics.

Over the recent past, fluoroquinolone antibiotics (FQs) have raised extensive attention due to their potential to induce the formation of resistance genes and "superbugs", thus various advanced oxidation techniques have been developed to eliminate their release into the environment. In the present study, the prototype tetraamido macrocyclic ligand (Fe-TAML)/hydrogen peroxide (HO) system is employed to degrade FQs (i.e.

Rapid destruction of triclosan by Iron(III)-Tetraamidomacrocyclic ligand/hydrogen peroxide system.

Iron(III)-tetraamidomacrocyclic ligand (Fe(III)-TAML) activators can activate hydrogen peroxide to oxidize many kinds of organic pollutants. In this study, we investigated the degradation of triclosan, a widely used broad-spectrum bactericide, under the treatment of Fe(III)-TAML/HO system at different pH conditions. We also studied the influence of natural organic matter (NOM) on the degradation process.

Photo-aging of polyvinyl chloride microplastic in the presence of natural organic acids.

In this study, a new photo-aging pathway in the aquatic environments and the underlying transformation mechanism were described for polyvinyl chloride microplastic (PVC-MP). Our results indicated that the photo-aging of PVC-MP was strongly dependent on particle size and the aging reaction could be facilitated in the presence of low-molecular-weight organic acid (LMWOA) and LMWOA-Fe(III) complex under simulated and natural sunlight irradiation and ambient conditions. The hydroxyl radical (OH•) generated from the photolysis of LMWOA or its ferric complexes played a dominant role in enhancing PVC-MP degradation.

Self-assembly of Fe-TAML-based microstructures for rapid degradation of bisphenols.

Iron(III)-tetraamidomacrocyclic ligand (Fe-TAML) activators have drawn great attentions due to the high reactivity to degrade organic pollutants. However, previous studies showed that the reactivity and stability of Fe-TAML were both strongly pH-dependent, which dramatically decrease at lower pH levels. Herein, Fe-TAML/DODMA (dimethyldioctadecylammonium chloride) microspheres with diameters ranging from 100 to 2000 nm were synthesized via a surfactant-assisted self-assembly technique.