Abstract
Catalytic ozonation is a potential alternative to address the dye wastewater effluent, and developing an effective catalyst for catalyzing ozone is desired. In this study, a novel Fe/Mn@γ−Al2O3 nanomaterial was prepared and successfully utilized for catalytic ozonation toward dye wastewater effluent components (dimethyl phthalate and 1−naphthol). The synthesized Fe/Mn@γ−Al2O3 exhibited superior activity in catalytic ozonation of dimethyl phthalate and 1−naphthol in contrast to Fe@γ−Al2O3 and Mn@γ−Al2O3. Quench and probe tests indicated that HO° contributed to almost all removal of dimethyl phthalate, whereas O3, HO°, and singlet oxygen participated in the degradation of 1−naphthol in the Fe/Mn@γ−Al2O3/O3 system. The results of XPS, FT−IR, and EPR suggested that HO° and singlet oxygen were generated from the valence variations of Fe(II/III)and Mn(III/IV). Moreover, the Fe/Mn@γ−Al2O3/O3 system could also have excellent efficacy in actual water samples, including dye wastewater effluent. This study presents an efficient ozone catalyst to purify dye wastewater effluent and deepens the comprehension of the role and formation of reactive species involved in the catalytic ozonation system.
Highlights
Advanced oxidation processes (AOPs) gained much attention as powerful techniques to mineralize the pollutants in water treatments [1]
This study aims to investigate the performance of catalytic ozonation by synthesized Fe/Mn@γ−Al2 O3 nanoparticles
A novel Fe/Mn@γ−Al2 O3 nanocatalyst was successfully synthesized and utilized for catalytic ozonation of dimethyl phthalate (DMP) and 1−NP. Their removal rate constants could elevate 3−5 times with Fe/Mn@γ−Al2 O3 /O3 system compared to ozonation alone due to more yield of HO◦
Summary
Advanced oxidation processes (AOPs) gained much attention as powerful techniques to mineralize the pollutants in water treatments [1]. Catalytic ozonation is a promising technology for efficiently removing refractory pollutants, especially in the advanced treatment of wastewater. Heterogeneous catalytic ozonation can minimize the dissolving of toxic metal cations in contrast to homogeneous catalyzing. Many metal oxides have been utilized in the heterogeneous catalytic ozonation process, including manganese oxides, iron oxides/oxyhydroxide, aluminum oxides, and bimetallic/polymetallic oxides. MnOX supported by granular activated carbon or alumina catalyzed ozone to generate hydroxyl radical (HO◦ ) and efficiently degrade benzenes [2,3]. The surface hydroxyl groups of hydroxylated synthetic A−FeOOH can promote catalyzing ozone to yield HO◦ [4], and surface MeO−H weak bonds were the favorable sites for accelerating HO◦ generation. The complex of oxalic acid and iron (Fe2 O3 /Al2 O3 ) reacted with ozone and accelerated the degradation of oxalic acid [5]. In addition to Mn and Fe, TiO2 and MgO nanoparticles were investigated and used to catalyze ozone [6,7]
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