The influence of active carbon contaminants on the ozonation mechanism interpretation

Fijołek, Lilla; Świetlik, J.; Frankowski, Marcin

doi:10.1038/s41598-021-89510-y

Cited by 7 publications

(3 citation statements)

References 52 publications

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“…Te surface charge of activated carbons 32 is afected by the pH of the solution. When the pH of the solution is less than pH pzc, the carbon surface has a positive surface charge, and when the pH is more than pH pzc, the carbon surface has a negative charge [35]. Terefore, the activated carbon prepared under this study exhibit a positive surface charge and attracts negatively charged HCrO4 − .…”

Section: Chac Physiochemical Propertiesmentioning

confidence: 85%

Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H2SO4) as Activating Agent by Using Central Composite Design (CCD)

Amibo

Beyan

Bayu

et al. 2023

Journal of Environmental and Public Health

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The primary goal of this research is to lower the hexavalent chromium (Cr (VI)) concentration that has occurred from the growth of the tannery industry. As a result, the potential for heavy metal concentration is increasing day by day. Industrial effluent containing Cr (VI) contributes significantly to water pollution. Chromium hexavalent ion (Cr (VI)) in wastewater is extremely hazardous to the environment. It is critical to address such a condition using activated carbon derived from biomass. Adsorption is one of the most successful methods for removing hexavalent chromium from wastewater. Treated wastewater has no substantial environmental contamination consequences. The ash content, moisture content, volatile matter content, and fixed carbon content of wet coffee husk were 3.51, 10.85, 68.33, and 17.31, respectively. The physicochemical properties of coffee husk-based activated carbon (CHBAC) obtained during experimentation were pH, porosity, the yield of CHBAC, bulk density, point of zero charges, and specific surface area of 5.2, 58.4 percent, 60.1 percent, 0.71 g/mL, 4.19, and 1396 m2/g, respectively, indicating that CHBAC has a higher capacity as an adsorbent medium. For optimization purposes, the parameters ranged from pH (0.3–3.7), dose (2.3–5.7) g , and contact time (0.3–3.7) hr. The quadratic models were chosen for optimization, and the p value for the model was significant since it was less than 0.05, but the lack of fit model was inconsequential because it was more than 0.05. The optimum adsorption obtained with numerical optimization of Cr (VI) was 97.65 percent. This was obtained at a pH of 1.926, a dose of 4.209 g/L, and a contact time of 2.101 hours. This result was observed at a pH of 1.93, a dosage of 4.2 g/L, and a contact duration of 2.1 hours. The desirability obtained during numerical optimization was 1. Coffee husk-based activated carbon has a bigger surface area, and it has a stronger ability to absorb hexavalent chromium from tannery wastewater effluents.

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Section: Chac Physiochemical Propertiesmentioning

confidence: 85%

Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H2SO4) as Activating Agent by Using Central Composite Design (CCD)

Amibo

Beyan

Bayu

et al. 2023

Journal of Environmental and Public Health

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“…AC and AC-I showed alkali properties due to alkali impurity. 29) However, AC-I/S showed acidic properties. The pH decrease could be due to the acid dissociation of sulfate.…”

Section: Surface Analysis Of Catalystsmentioning

confidence: 99%

Ozone catalytic oxidation of dimethyl sulfide and surface analysis of iodine catalyst

Mizuno

Sadiq

Guji

et al. 2023

Jpn. J. Appl. Phys.

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This study, reports on ozone catalytic oxidation of dimethyl sulfide; a major odor material of waste water facilities. Xenon excimer lamp (XEL) was used for ozone generation, and iodine compounds (I- and IO3-) were utilized as a catalyst. Three types of activated carbon, activated carbon impregnated with iodine compounds and sulfate (AC-I/S), activated carbon impregnated with iodine (AC-I) and activated carbon without impregnation (AC) were tested as catalysts. Only AC-I/S had catalytic activity in the dynamic adsorption experiment. Breakthrough time of dimethyl sulfide was increased by 10 times by adding ozone in AC-I/S. Catalyst characterization by pH measurement and XPS analysis suggested that catalytic activity of iodine compounds was influenced by the surface acidity. These results suggest that the XEL and AC-I/S are applicable in ozone catalytic oxidation in gas treatments.

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“…This might be due to the impregnation materials infiltrating the pores [41]. The pH of activated carbon was alkali due to the impurity of the metals [42]. The pH was decreased by impregnation due to acid dissociation.…”

Section: Characteristics Of Granular Impregnated Activated Carbonmentioning

confidence: 99%

Ozone Catalytic Oxidation for Gaseous Dimethyl Sulfide Removal by Using Vacuum-Ultra-Violet Lamp and Impregnated Activated Carbon

et al. 2022

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Gaseous sulfur compounds are emitted from many facilities, such as wastewater facilities or biomass power plants, due to the decay of organic compounds. Gaseous dimethyl sulfide removal by ozone catalytic oxidation was investigated in this study. A Vacuum-Ultra-Violet (VUV) xenon excimer lamp of 172 nm was used for ozone generation without NOx generation, and activated carbon impregnated with iodic acid and H2SO4 was utilized as a catalyst. Performance assessment of dimethyl sulfide removal ability was carried out by a dynamic adsorption experiment. Empty-Bed-Contact-Time (EBCT), superficial velocity, concentration of dimethyl sulfide, temperature and humidity were set at 0.48 s, 0.15 m/s, 3.0 ppm, 25 °C and 45%, respectively. Without ozone addition, the adsorption capacity of impregnated activated carbon was 0.01 kg/kg. When ozone of 7.5 ppm was added, the adsorption capacity of impregnated activated carbon was increased to 0.15 kg/kg. Methane sulfonic acid, a reaction product of dimethyl sulfide and ozone, was detected from the activated carbon. The results suggest that the VUV and activated carbon impregnated with iodic acid and H2SO4 are workable for ozone catalytic oxidation for gas treatments.

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The influence of active carbon contaminants on the ozonation mechanism interpretation

Cited by 7 publications

References 52 publications

Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H2SO4) as Activating Agent by Using Central Composite Design (CCD)

Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H2SO4) as Activating Agent by Using Central Composite Design (CCD)

Ozone catalytic oxidation of dimethyl sulfide and surface analysis of iodine catalyst

Ozone Catalytic Oxidation for Gaseous Dimethyl Sulfide Removal by Using Vacuum-Ultra-Violet Lamp and Impregnated Activated Carbon

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