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The FeMoS 2 catalyst for activating peroxymonosulfate (PMS) is a promising pathway for removing organic pollutants in wastewater, however, the dominant FeS 2 phases and sulfur (S) vacancies in it are little involved. Herein, for the first time, novel bimetallic FeMoS 2 microparticles were synthesized by a simple method and then applied for PMS activation for degrading organic pollutants. The catalysts were characterized by several techniques, including X-ray diffraction and X-ray photoelectron spectroscopies. The results revealed that new FeMoS 2 microparticles containing S vacancies in the main FeS 2 phases were obtained. FeS 2 and S vacancies were found to play important roles for activating PMS by radical and nonradical pathways. More Fe 2+ and Mo 4+ were formed in the presence of S vacancies, which offered a new strategy for exploring novel heterogeneous catalysts in the activation of PMS for environmental remediation., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

The enhancement of vacancies in catalysts involving Fenton-like reactions is a promising way to remove organic pollutants in wastewater, but sulfur vacancies are rarely involved. In this work, MoS 2 containing defect sites were synthesized by a simple high-temperature treatment and then applied for activating peroxymonosulfate to eliminate organic pollutants in wastewater. The structure was characterized by several techniques such as XRD, BET, and XPS. Important influencing factors were systemically investigated. The results indicated that MoS 2 with sulfur vacancies possessed a higher catalytic activity than that of the parent MoS 2 . The annealing temperature of the catalyst had a great effect on the removal of organic pollutants. Besides, the catalytic system had a wide pH range. Quenching and electron paramagnetic resonance (EPR) experiments indicated that the reaction system contained radical and non-radical species. The characterization results revealed that the defect sites in catalysts mainly strengthened the activity of catalysts. This study offers a new heterogeneous catalyst for the removal of organic pollutants via the peroxymonosulfate-based Fenton-like reactions., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

The development of novel wastewater treatment processes that use heterogeneous catalysts to activate hydrogen peroxide (H 2 O 2 ) with bicarbonate (HCO 3 - ) has been a subject of great interest in recent years; however, significant challenges remain, despite research into numerous metal-based catalysts. The work presented herein employed oxygen-doped graphitic carbon nitride (O/g-C 3 N 4 ) as a non-metal catalyst for activating H 2 O 2 in the presence of HCO 3 - , and this method represented the first system capable of removing organic pollutants in the dark, to our knowledge. The catalysts were characterized using several microscopic imaging, spectroscopic, electrochemical, and crystallographic techniques, as well as N 2 -physorption procedures. Analysis of the results revealed that the O/g-C 3 N 4 catalyst possessed a high specific surface area and many defect sites. Various operational parameters, including the relative amounts of HCO 3 - , H 2 O 2 , and O/g-C 3 N 4 , were systemically investigated. A clear performance enhancement was observed in the degradation of organic contaminants when subjected to the HCO 3 - -H 2 O 2 -O/g-C 3 N 4 system, and this result was ascribed to the synchronous adsorption and chemical oxidation processes. The novel system presented herein represented a new water treatment technology that was effective for removing organic contaminants., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

A [Fe 3 O 4 /polyvinyl pyrrolidone (PVP)]//[Tb(BA) 3 phen/PVP] Janus nanofiber array pellicle (denoted JNAP) was successfully constructed by facile conjugate electrospinning without twisting for the first time. The JNAP offers the dual-functionality of fluorescence and magnetism. This technology entirely solves the dilemma of the magnetic spinning dope and fluorescent spinning dope being easily mixed together during the parallel electrospinning process, as it achieves complete segregation of magnetic nanoparticles and fluorescent molecules. Moreover, conjugate electrospinning without twisting has fewer requirements on the viscosity of the spinning dope compared with parallel electrospinning, in which the two spinning dopes should have the same viscosity. It was satisfactorily found that the JNAP has higher fluorescence intensity than the corresponding non-aligned Janus nanofiber pellicle. The magnetism of the JNAP could be tailored by changing the doping amount of the Fe 3 O 4 NPs. The JNAP has potential applications in nanotechnology and biomedicine, etc. , due to its enhanced green fluorescence and adjustable magnetism. In addition, this design concept and manufacturing process provide a facile way for preparing other one-dimensional Janus nanomaterials with multifunctionality., Competing Interests: There are no conflicts of interest to declare., (This journal is © The Royal Society of Chemistry.)