Cu/Fe Bimetallic Treatment Performance on Organophosphorus Pesticides

Abstract

Typical organophosphorus pesticides, such as glyphosate, trichlorfon, and ethephon, are widely used nowadays, and the treatment of their production wastewater is difficult to achieve by conventional water treatment methods. A Cu/Fe bimetallic system has been proposed as a viable technology to treat toxic and refractory pollutants. The performance of the system with different pH, Cu/Fe molar ratios, Cu/Fe dosages, and initial glyphosate concentrations was analyzed to investigate the operational factors affecting glyphosate removal by the Cu/Fe bimetallic system. Acidic pH (2.0), 250 g/L Cu/Fe dosage, 0.25% Cu/Fe, and 60 mg/L initial glyphosate concentration were the appropriate conditions for glyphosate removal, in which the efficiency of the system was in accordance with the pseudo–second-order kinetic model. Under this condition, the removal efficiencies of total phosphorus and total organic carbon reached 99 and 65%, respectively. The Fe/Cu bimetal surface was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The optimal conditions for glyphosate decomposition were applied to the treatment of trichlorfon and ethephon. The removal efficiency of the system was poor, but its toxicity to luminescent bacteria Q67 was remarkably reduced.

Optimization of Fe/Ni, Fe/Cu bimetallic nanoparticle synthesis process utilizing concentrated Camellia sinensis extract solution and activity evaluation through methylene blue removal reaction

“…BNPs function both as catalysts to enhance the rate of pollutant degradation and as effective agents to hinder the surface oxidation of nanoparticles, surpassing the performance of monometallic zero-valent materials [8]. Transition metals are often the subject of research and use as 2nd grade metals to enhance the activity of Fe-based BNPs [9,10]. Platinum and other precious metals were studied very early [11] and could be used as cocatalysts but at high cost and in limited supply.…”