In this study, treatment of terephthalic acid wastewater by various advanced oxidation methods an... more In this study, treatment of terephthalic acid wastewater by various advanced oxidation methods and biological oxidation using walnut shells based catalysts has been studied. The target compounds to represent terephthalic acid wastewater were selected as terephthalic acid (TPA), benzoic acid (BA) and p-toluic acid (p-Tol). Degradation of BA by various advanced oxidation methods such as Fenton-like oxidation, catalytic wet air oxidation, photocatalytic oxidation, photo-Fenton-like oxidation and by biological oxidation was investigated. Degradation of terephthalic acid and p-toluic acid by photocatalytic and photo-Fenton-like oxidation were also investigated. The first part was preparation and characterization of metal doped walnut shells based catalysts. Iron (Fe) or iron-titanium dioxide (Fe-TiO2 (1:99)) with a weight ratio of 10 % were doped to the activated carbon (AC) prepared from walnut shells by physical and different chemical activation methods such as acidic, neutral and basi...
In this study, treatment of simulated sugar industry wastewater by photo-Fentonlike and catalytic... more In this study, treatment of simulated sugar industry wastewater by photo-Fentonlike and catalytic wet air oxidation methods was investigated in the presence of heterojunction catalysts. The treatment efficiency was evaluated in terms of sugar, total organic carbon (TOC), and chemical oxygn demand (COD) removals. Initially, catalyst screening experiments for PFO and CWAO processes were carried out and copper doped bismuth oxyhalides (Cu-BiOX) and lanthanum containing perovskite catalysts (LaBO3) were selected as the most promising catalysts for PFO and CWAO processes, respectively. The sugar and TOC removals at optimum conditions reached up to 56% and 30% for PFO in the presence of selected catalyst Cu-BiOI whereas they reached up to 100% and 55% and for CWAO in the presence of selected catalyst LaCoO3, respectively. The BiOI/g-C3N4 heterojunction catalysts were tested for PFO method and the effect of synthesis procedure was evaluated in terms of catalytic activity. The synthesis met...
This research focused on the abatement of the model food dye, tartrazine, using visible light pho... more This research focused on the abatement of the model food dye, tartrazine, using visible light photo-Fenton oxidation with novel bismuth oxyhalide catalysts. Bismuth-oxyhalide and metal doped bismuth oxyhalide catalysts (BiOCl, Cu-BiOCl, and Fe-BiOCl) were synthesized via the facile co-precipitation method. The catalysts were characterized by SEM-EDX, XRD, BET, and DRS analyses and the results showed that Cu-BiOCl possess a unique flower-like nanostructure with narrow band gap (2.53 eV) which enhanced its visible light photocatalytic activity remarkably which was proven by catalyst screening experiments. A detailed experimental study was carried out to investigate the effects of operating parameters on the degradation and decolorization of the dye and from this the optimum values were determined as 0.25 g/L for photocatalyst loading, 100 W for visible light power, 6 for initial pH, 6 mM for initial HO concentration, and temperature of 70 °C. Approximately 91% degradation, 95% decolor...
Journal of Environmental Chemical Engineering, 2018
Abstract In this study, the degradation of a major pollutant present in terephthalic acid wastewa... more Abstract In this study, the degradation of a major pollutant present in terephthalic acid wastewater, benzoic acid, was investigated by several advanced oxidation methods using catalysts derived from walnut shells. The 10% Fe or 10% Fe-TiO2 (wt/wt, 1:99 as Fe:TiO2) catalysts were loaded on an AC prepared from walnut shells by physical activation or chemical activation methods with different chemical reagents. The effect of the activation method was investigated using catalyst screening tests. The most efficient catalyst for the Fenton-like oxidation and catalytic wet air oxidation was determined as B-FAC and for photocatalytic/photo-Fenton-like oxidation was the N-FTAC from the screening experiments. After the catalyst screening, the effect of operating conditions such as catalyst loading, temperature, initial pH, etc. on the catalytic activity were tested in terms of degradation efficiency by determining their optimum values. Maximum degradation efficiencies from parametric studies for each method were 40% for the Fenton-like oxidation, 70% for the catalytic wet air oxidation, and 90% for photocatalytic oxidation. The highest degradation efficiency was achieved by the photo-Fenton-like oxidation in the presence of the N-FTAC catalyst with a degradation efficiency of 95% at 0.5 g/L catalyst loading, 6 W UV light, 2 mM initial H2O2 concentration, and an initial pH of 3 or 6, with a reaction time of 80 min.
Journal of Selcuk University Natural and Applied Science, 2013
In this study, the degradation of benzoic acid by Fenton-like process was investigated over a Fe ... more In this study, the degradation of benzoic acid by Fenton-like process was investigated over a Fe 3+ doped on activated carbon catalyst. The walnut shells were activated by physical activation method and Fe 3+ ions were doped by wet impregnation. The initial concentration of benzoic acid in degradation experiments was 50 mg/L. The effects of operation parameters such as hydrogen peroxide concentration, catalyst loading, temperature, and pH were examined. The optimum values of these parameters were found as 3 mM for hydrogen peroxide concentration, 0.1 g/L for catalyst loading, approximately 25°C for (room) reaction temperature without pH adjustment (pH=4). At these conditions, approximately 10-15% degradation was achieved. It was concluded that since very low degradation efficiencies were achieved, the catalyst prepared, was not very active in the treatment of benzoic acid. For the ongoing experiments, it is planned to prepare the activated carbon by chemical activation based on usi...
In this study, treatment of terephthalic acid wastewater by various advanced oxidation methods an... more In this study, treatment of terephthalic acid wastewater by various advanced oxidation methods and biological oxidation using walnut shells based catalysts has been studied. The target compounds to represent terephthalic acid wastewater were selected as terephthalic acid (TPA), benzoic acid (BA) and p-toluic acid (p-Tol). Degradation of BA by various advanced oxidation methods such as Fenton-like oxidation, catalytic wet air oxidation, photocatalytic oxidation, photo-Fenton-like oxidation and by biological oxidation was investigated. Degradation of terephthalic acid and p-toluic acid by photocatalytic and photo-Fenton-like oxidation were also investigated. The first part was preparation and characterization of metal doped walnut shells based catalysts. Iron (Fe) or iron-titanium dioxide (Fe-TiO2 (1:99)) with a weight ratio of 10 % were doped to the activated carbon (AC) prepared from walnut shells by physical and different chemical activation methods such as acidic, neutral and basi...
In this study, treatment of simulated sugar industry wastewater by photo-Fentonlike and catalytic... more In this study, treatment of simulated sugar industry wastewater by photo-Fentonlike and catalytic wet air oxidation methods was investigated in the presence of heterojunction catalysts. The treatment efficiency was evaluated in terms of sugar, total organic carbon (TOC), and chemical oxygn demand (COD) removals. Initially, catalyst screening experiments for PFO and CWAO processes were carried out and copper doped bismuth oxyhalides (Cu-BiOX) and lanthanum containing perovskite catalysts (LaBO3) were selected as the most promising catalysts for PFO and CWAO processes, respectively. The sugar and TOC removals at optimum conditions reached up to 56% and 30% for PFO in the presence of selected catalyst Cu-BiOI whereas they reached up to 100% and 55% and for CWAO in the presence of selected catalyst LaCoO3, respectively. The BiOI/g-C3N4 heterojunction catalysts were tested for PFO method and the effect of synthesis procedure was evaluated in terms of catalytic activity. The synthesis met...
This research focused on the abatement of the model food dye, tartrazine, using visible light pho... more This research focused on the abatement of the model food dye, tartrazine, using visible light photo-Fenton oxidation with novel bismuth oxyhalide catalysts. Bismuth-oxyhalide and metal doped bismuth oxyhalide catalysts (BiOCl, Cu-BiOCl, and Fe-BiOCl) were synthesized via the facile co-precipitation method. The catalysts were characterized by SEM-EDX, XRD, BET, and DRS analyses and the results showed that Cu-BiOCl possess a unique flower-like nanostructure with narrow band gap (2.53 eV) which enhanced its visible light photocatalytic activity remarkably which was proven by catalyst screening experiments. A detailed experimental study was carried out to investigate the effects of operating parameters on the degradation and decolorization of the dye and from this the optimum values were determined as 0.25 g/L for photocatalyst loading, 100 W for visible light power, 6 for initial pH, 6 mM for initial HO concentration, and temperature of 70 °C. Approximately 91% degradation, 95% decolor...
Journal of Environmental Chemical Engineering, 2018
Abstract In this study, the degradation of a major pollutant present in terephthalic acid wastewa... more Abstract In this study, the degradation of a major pollutant present in terephthalic acid wastewater, benzoic acid, was investigated by several advanced oxidation methods using catalysts derived from walnut shells. The 10% Fe or 10% Fe-TiO2 (wt/wt, 1:99 as Fe:TiO2) catalysts were loaded on an AC prepared from walnut shells by physical activation or chemical activation methods with different chemical reagents. The effect of the activation method was investigated using catalyst screening tests. The most efficient catalyst for the Fenton-like oxidation and catalytic wet air oxidation was determined as B-FAC and for photocatalytic/photo-Fenton-like oxidation was the N-FTAC from the screening experiments. After the catalyst screening, the effect of operating conditions such as catalyst loading, temperature, initial pH, etc. on the catalytic activity were tested in terms of degradation efficiency by determining their optimum values. Maximum degradation efficiencies from parametric studies for each method were 40% for the Fenton-like oxidation, 70% for the catalytic wet air oxidation, and 90% for photocatalytic oxidation. The highest degradation efficiency was achieved by the photo-Fenton-like oxidation in the presence of the N-FTAC catalyst with a degradation efficiency of 95% at 0.5 g/L catalyst loading, 6 W UV light, 2 mM initial H2O2 concentration, and an initial pH of 3 or 6, with a reaction time of 80 min.
Journal of Selcuk University Natural and Applied Science, 2013
In this study, the degradation of benzoic acid by Fenton-like process was investigated over a Fe ... more In this study, the degradation of benzoic acid by Fenton-like process was investigated over a Fe 3+ doped on activated carbon catalyst. The walnut shells were activated by physical activation method and Fe 3+ ions were doped by wet impregnation. The initial concentration of benzoic acid in degradation experiments was 50 mg/L. The effects of operation parameters such as hydrogen peroxide concentration, catalyst loading, temperature, and pH were examined. The optimum values of these parameters were found as 3 mM for hydrogen peroxide concentration, 0.1 g/L for catalyst loading, approximately 25°C for (room) reaction temperature without pH adjustment (pH=4). At these conditions, approximately 10-15% degradation was achieved. It was concluded that since very low degradation efficiencies were achieved, the catalyst prepared, was not very active in the treatment of benzoic acid. For the ongoing experiments, it is planned to prepare the activated carbon by chemical activation based on usi...
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