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چکیده
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Organic dyes are stable and persistent toxic compounds in the aquatic environment that are refractoryto decompose by differentremoval methods such as physico-chemical, optical and biological. Their presence in the aquatic media threatens human and wildlife. Therefore, herein, ZnO nanoparticles (NPs) due to good chemical durability, abundant availability, easy preparation, low cost and good photocatalytic performance was anchored on biochar (ZnO@biochar) nanocomposites were synthesized towardsactivation ofperoxymonosulfate (PMS) for the photocatalytic removal of methyl orange (MO) dye. Several methods were used to characterization of the nanocomposites including FESEM, XRD, PL, EDS, FT-IR spectroscopy, and N2 adsorption/desorption. The results of the characterization techniques demonstrated that the well-dispersed ZnO NPs were loaded onto the biochar surface.According to the particle size distribution graph, the average particle size of 64 nm was obtained for the ZnONPs. BET analyzes showed that pore volume, the specific surface area (SSA) and average pore size of the synthesized nanocomposite increased. The survey of effective operational parameters indicated that the highest photocatalytic activity for MO removal was in the pH 3 of solution, 5 ppm initial dye concentration, 30 mg ZnO/biochar nanocomposite, and 20 mg PMS dose under LED-50W lamp irradiation (97.03% in the reaction time of 80 min). During the process, the reduction of the total organic carbon (TOC) contents and chemical oxygen demand (COD) were observed. Moreover, the MO degradation kinetics under optimal operating conditionswere determined. It is concluded that the ZnO@biochar nanocomposite/PMS process was an efficient degradation method for the decomposition of the dye pollutant.
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