Ozonation of C.I. Reactive Red 194 and C.I. Reactive Yellow 145 in aqueous solution in the presence of granular activated carbon

Gül, Şermin; Özcan, Özlem; Erbatur, Oktay

doi:10.1016/j.dyepig.2006.06.018

Cited by 50 publications

(11 citation statements)

References 21 publications

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“…AC was originally used for removal of the chlorine that was added for sterilization, but currently it is also used to remove organic substances, such as organic halides including THMs, organic compounds generated by OZ treatment and odorous substances. In addition, the combined use of AC and OZ possibly enhances the decolorizing effect 4,7,8) . Therefore, we examined efficiency of removal of orange II (OR, an acidic dye), methylene blue (MB, a basic dye), and humic acid (HA), which occurs abundantly in nature, by AC, OZ and combined OZ and AC (OZAC) treatments.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Orange II, Methylene Blue and Humic Acid by Ozone-Activated Carbon Combination (OZAC) Treatment

et al. 2008

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To prevent formation of trihalomethanes (THMs) in drinking water, removing precursors of trihalomethanes (PTHMs) in water resources for tap water is essential. We compared the following three treatments for removal of PTHMs: activated carbon (AC), ozone (OZ) and ozone-activated carbon combination (OZAC). Orange II (OR, an acidic dye), methylene blue (MB, a basic dye) and humic acid (HA) were used as PTHMs. HA exists abundantly as PTHM in nature. Results demonstrated that PTHMs could be decomposed or removed by either AC or OZ treatment. Efficiency of removal of HA by the three treatment methods was lower than that for removal of OR and MB, as the molecules of HA were larger than those of OR and MB. Decreases of total organic carbon values were achieved by treatment of MB with OZ or HA with AC. As for advanced water treatment, a two-step sequential process of OZ-AC treatments is currently used. However, the present results demonstrated that highly efficient removal of PTHMs could be accomplished by the addition of AC during OZ treatment.

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Section: Introductionmentioning

confidence: 99%

“…On the other hand, the adsorbed amount of HA was 200 mg/g, which is considerably less than that of OR at an equilibrium concentration of 800 mg, indicating that it is difficult to remove HA by AC. As the molecular size of HA is larger than that of OR and MB, it may be more difficult to enter into micropores of AC 7) .…”

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confidence: 99%

Removal of Orange II, Methylene Blue and Humic Acid by Ozone-Activated Carbon Combination (OZAC) Treatment

et al. 2008

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“…Activated carbon has been appointed as a very good catalyst in the ozone decomposition [16,17] and in the mineralisation of dyes [18][19][20][21], aromatic compounds [22][23][24][25][26][27] and carboxylic acids [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Development of Novel Mesoporous Carbon Materials for the Catalytic Ozonation of Organic Pollutants

et al. 2009

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Mesoporous carbon materials prepared via SBA-15 templating and carbon xerogels were tested as catalysts for the ozonation of organic pollutants, and their performances compared to activated carbons. Kinetic results showed that only the combination of the mesoporous carbons with ozone may lead to total mineralisation. The roles of surface chemistry and textural parameters of the catalysts are discussed.

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“…Moreover, since ozone generates highly reactive hydroxyl radicals on the surface of activated carbon 15) , it is conceivable that functional groups existing on its surface affect E2 adsorption onto the carbon. The adsorption rates of E2 onto ozonized activated carbon are given in which indicates practically no difference in the removal rate between non-and ozone-treated activated carbon.…”

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confidence: 99%

“…It was therefore considered that ozone oxygenated the surface of activated carbon to get carboxyl groups and phenolic hydroxyls increased. It was reported that ozone produced highly reactive hydroxyl radicals 15) . It was therefore assumed that adsorption of E2 was blocked through enhanced surface polarity because of the hydrophobic property of the hormone.…”

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Degradation Characteristics of 17.BETA.-Estradiol by Ozone Treatment with Activated Carbon

et al. 2009

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In England, feminization of fish was observed in rivers into which sewage treatment plants drained in the 1980s. This observation attracted attention to behaviors of chemical compounds in sewage possessing especially estrogenlike actions. At the beginning, the derangement of the water ecologic system caused by sewage treatment was considered to be caused by synthetic chemicals like nonylphenol. Recently, however, it was clarified that natural estrogens including 17b-estradiol (E2), estrone, and estriol from human or livestock excreta and synthetic estrogens as well like 17a-ethynylestradiol were major responsible agents 1) . Steroid hormones are synthesized in the human body at 25-100 mg/day in adult women, more in pregnant women, and 1-25 mg/day in men as well. These hormones are inactivated by drug-metabolizing enzymes in the liver. These metabolites are further transformed in the liver or in the small intestine to sulfate conjugates or glucuronic acid conjugates to be excreted in excreta. The conjugates are excreted in urine at several to 60 mg/day in women and at 200 to 400 mg/day in pregnant women.The national survey conducted by the Ministry of the Environment in 2005 (17 th year of Heisei) reported that E2 possessing the highest estrogenic activity among estrogens was detected at concentrations of 0.11-1.7 ng/L in 4 out of 11 examined spots. Natural estrogens are supposed to affect the ecologic system at a concentration as low as several ng/L.In Japan, the removal rate of estrogens at sewage treatment plants vary greatly depending on treatment plants and their environments. Development of treatment methods that can remove estrogens highly efficiently as well as stably is now desired. Currently, advanced sewage treatments including ozonization and activated carbon treatment are now being carried out.Regarding E2, there are reports on adsorption treatment by activated carbon 2) , removal efficiency improved by a 261 Journal of Oleo Science Copyright ©2009 by Japan Oil Chemists' Society J. Oleo Sci. 58, (5) 261-266 (2009) Degradation Characteristics of 17b-Estradiol by Ozone Treatment with Activated CarbonNaohito Kawasaki , Fumihiko Ogata, Isao Yamaguchi and Hisato TominagaSchool of Pharmacy, Kowakae, JAPAN) Abstract: The present study investigates (1) ozone treatment, (2) adsorption treatment using activated carbon treatment, and (3) ozone treatment with activated carbon for their efficacy in removing 17b-estradiol (E2) present in an aqueous solution. Both ozone and activated carbon treatments for 20 min were effective in removing E2 (initial concentration, 100 mg/L). However, both treatments have been used for two processes, and the disposal time with these treatments is more than that of another treatment. In this study, ozone treatment with activated carbon was investigated with regard to the percentage of E2 removal, pH, and chemical oxygen demand (COD). The physical and chemical characteristics of the activated carbon surface were modified due to the ozone treatment: the surface was oxidized by ozon...

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Ozonation of C.I. Reactive Red 194 and C.I. Reactive Yellow 145 in aqueous solution in the presence of granular activated carbon

Cited by 50 publications

References 21 publications

Removal of Orange II, Methylene Blue and Humic Acid by Ozone-Activated Carbon Combination (OZAC) Treatment

Removal of Orange II, Methylene Blue and Humic Acid by Ozone-Activated Carbon Combination (OZAC) Treatment

Development of Novel Mesoporous Carbon Materials for the Catalytic Ozonation of Organic Pollutants

Degradation Characteristics of 17.BETA.-Estradiol by Ozone Treatment with Activated Carbon

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