Rapid capture of perfluorooctanoic acid and perfluorooctane sulfonate at environmentally relevant concentrations via the 'mesh trap' of triazine-based polymer network: Mechanism and photocatalytic regeneration.

Per- and polyfluoroalkyl substances (PFAS) pose a serious threat to groundwater (GW) environment worldwide due to their difficulty in removal and high toxicity. In this study, the 'mesh trap' of triazine-based polymerization network (SNW-1) demonstrated rapid capture performance for Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) at environmentally relevant concentrations (1 μg/L). The SNW-1 can remove more than 90 % of PFOA and PFOS within 300 s and still maintain superior performance under four common GW anions and different [pH] (3 - 10).

Sterilization mechanism and nanotoxicity of visible light-driven defective carbon nitride and UV-excited TiO.

The sterilization effect of photocatalysis and biotoxicity of nanomaterial catalysts have attracted high attention. In this study, the novel visible-driven defective carbon nitride (VL/DCN) system exhibits non-photoreactivation, non-toxic superior performance compared with traditional ultraviolet radiation (UV) and UV/titanium dioxide (UV/TiO). The inactivation of antibiotic-resistant bacteria (ARB) by novel VL/DCN still reached 7 log within 4 h, and the reduction rates of aminoglycoside gene strB and tetracycline gene tetA exceeded 0.

Synergetic mechanism of defective g-CN activated persulfate on removal of antibiotics and resistant bacteria: ROSs transformation, electron transfer and noncovalent interaction.

The environmental hazards of antibiotics and the resulting antibiotic-resistant bacteria (ARB) have attracted more and more attention. In this study, an efficient synergistic system constructed by vacancy g-CN (CN) and persulfate (PS) showed excellent oxidation performance to degrade aztreonam (AZT) and Escherichia coli (E. coli) screened from wastewater treatment plant (WWTP), as the typical β-lactam antibiotic and ARB.

Origins of selective differential oxidation of β-lactam antibiotics with different structure in an efficient visible-light driving mesoporous g-CN activated persulfate synergistic mechanism.

In the study, an efficient '1 + 1 > 2' synergistic coupling system driven by visible light consisting of mesoporous g-CN (MCN) and persulfate (PS)was constructed. The free radical transformation, electron transfer and non-covalent interaction between the MCN layer and PS in the system were explored via experiments and DFT calculations. The similarity for the fate of the seven β-lactam antibiotics with typical structures in the oxidation system was studied systematically in depth.

Effect of carbon nitride synthesized by different modification strategies on the performance of carbon nitride/PVDF photocatalytic composite membranes.

Carbon nitride (CN)/polyvinylidene fluoride (PVDF) photocatalytic composite membrane (PCM) is considered as a promising candidate to improve the anti-fouling characteristic of conventional PVDF membrane and overcome the difficulty encountered during recovery of powder catalyst simultaneously. However, the effects of differently-modified CN on PCM and its mechanism are still unclear. In this study, bulk-CN (BCN), carbon defects CN (CCN), nitrogen defect CN (DCN), mesoporous CN (MCN), and nitrogen-rich CN (NCN) were incorporated into PVDF by phase inversion method.

A porous g-CN nanosheets containing nitrogen defects for enhanced photocatalytic removal meropenem: Mechanism, degradation pathway and DFT calculation.

A porous g-CN nanosheet containing nitrogen defects (D-g-CN) was synthesized by using a one-step polymerization process in an atmosphere produced via the decomposition of ammonium persulfate. The photocatalytic removal rate of D3-g-CN for meropenem (MER) is 7.45-fold higher than the one of a conventional g-CN sample.

Enhanced photocatalytic removal of amoxicillin with Ag/TiO/mesoporous g-CN under visible light: property and mechanistic studies.

In present study, an efficient ternary Ag/TiO/mesoporous g-CN (M-g-CN) photocatalyst was successfully synthesized through depositing Ag nanoparticles (NPs) on the surface of TiO/M-g-CN heterojunction. Ag/TiO/M-g-CN nanocomposite displayed the highest degradation efficiency for amoxicillin (AMX) compared to TiO/M-g-CN heterojunction, M-g-CN, and bulk-g-CN (B-g-CN). The removal efficiency of AMX in real situation, surface water (SW), hospital wastewater (HW), and waste water treatment plant (WWTP) also were studied to illustrate the effectiveness of Ag/TiO/M-g-CN photocatalysts.