查看更多>>摘要：Iron-based catalysts have been widely used to treat refractory organic pollutants in wastewater.In this paper,magnetic Co-γ-Fe2O3 was synthesized by a facile tartaric acid-assisted hydrothermal method,and Co-γ-Fe2O3/MoS2 nanocomposite catalyst was obtained via in situ growth of MoS2 nanosheets on Co-γ-Fe2O3 nanoparticles.The nanocomposite catalysts were used to decompose bisphenol A(BPA)by activating peroxymonosulfate(PMS).It was shown that only 0.15 g/L catalyst and 0.5 mmol/L PMS degraded 10 mg/L of BPA(99.3％within 10 min)in the pH range of 3-9.PMS was activated due to redox cycling among the pairs Co(Ⅲ)/Co(Ⅱ),Fe(Ⅲ)/Fe(Ⅱ),and Mo(Ⅵ)/Mo(Ⅳ).Quenching experiments and electron paramagnetic resonance spectroscopy demonstrated that both radical and non-radical pathways were involved in BPA degradation,in which active radical sulfate radical and non-radical singlet oxygen were the main reactive oxygen species.Ten intermediates were identified by liquid chromatography-coupled mass spectrometry,and three possible BPA degradation pathways were proposed.The toxicity of several degradation intermediates was lower,and Co-γ-Fe2O3/MoS2 exhibited excellent reusability and could be magnetically recovered.
查看更多>>摘要：Radiocesium is frequently present in radioactive wastewater,while its removal is still a challenge due to its small hydrated radius,high diffusion coefficient,and similar chemical behavior to other alkali metal elements with high background concentrations.This review summarized and analyzed the recent advances in the removal of Cs+from aqueous solutions,with a particular focus on adsorption and membrane separation methods.Various inorganic,organic,and biological adsorbents have undergone assessments to determine their efficacy in the removal of cesium ions.Additionally,membrane-based separation techniques,including reverse osmosis,forward osmosis,and membrane distillation,have also shown promise in effectively separating cesium ions from radioactive wastewater.Additionally,this review summarized the main approaches,including Kurion/SARRY system+desalination system and advanced liquid processing system,implemented after the Fukushima Daiichi nuclear power plant accident in Japan to remove radionuclides from contaminated water.Adsorption technology and membrane separation technology play a vital role in treatment of contaminated water.
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