Self-enhanced ozonation of benzoic acid at acidic pHs

Huang, Xianfeng; Li, Xuchun; Pan, Bingcai; Li, Hongchao; Zhang, Yanyang; Xie, Bin

doi:10.1016/j.watres.2015.01.010

Cited by 50 publications

(28 citation statements)

References 41 publications

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“…Organic compounds, especially with electron withdriving substituents at the aromatic ring, can be easily removed in self-enhanced ozonation processes at low pH 41 , 42 . Succinic acid does not possess aromatic ring, therefore self-enhance ozonation reaction could not be expected.…”

Section: Resultsmentioning

confidence: 99%

The influence of active carbon contaminants on the ozonation mechanism interpretation

Fijołek

Świetlik

Frankowski

2021

Sci Rep

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In water treatment technology, activated carbons are used primarily as sorbents to remove organic impurities, mainly natural organic matter, but also as catalysts in the ozonation process. Commercially available activated carbons are usually contaminated with mineral substances, classified into two main groups: alkali metals (Ca, Na, K, Li, Mg) and multivalent metals (Al, Fe, Ti, Si). The presence of impurities on the carbon surface significantly affects the pHpzc values determined for raw and ozonated carbon as well as their acidity and alkalinity. The scale of the observed changes strongly depends on the pH of the ozonated system, which is related to the diffusion of impurities from the carbon to the solution. In an acidic environment (pH 2.5 in this work), the ozone molecule is relatively stable, yet active carbon causes its decomposition. This is the first report that indirectly indicates that contaminants on the surface of activated carbon (multivalent elements) contribute to the breakdown of ozone towards radicals, while the process of ozone decomposition by purified carbons does not follow the radical path in bulk solution. Carbon impurities also change the distribution of the reaction products formed by organic pollutants ozonation, which additionally confirms the radical process. The study showed that the use of unpurified activated carbon in the ozonation of succinic acid (SA) leads to the formation of a relatively large amount of oxalic acid (OA), which is a product of radical SA degradation. On the other hand, in solutions with purified carbon, the amount of OA generated is negligible.

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Section: Resultsmentioning

confidence: 99%

The influence of active carbon contaminants on the ozonation mechanism interpretation

Fijołek

Świetlik

Frankowski

2021

Sci Rep

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“…Based on retention time and mass spectrum analysis, as well as comparison with national institute of standards and technology (NIST) database (Gaithersburg, MD, United States) 1 , the chromatographic peaks were identified (Lu et al, 2018). In addition, to further verify the degradation metabolites, the benzoic acid concentration after 40 h of phenol degradation was measured by HPLC (Ultimate 3000, Dionex) according to the method described by Huang et al (2015). Meanwhile, the activities of phenol hydroxylase (EC 1.14.13.7) and catechol 1,2-dioxygenase (EC 1.13.11.1) were detected by UV-vis spectrophotometer (TU-1810, Purkinje, China) at wavelengths of 340 nm and 260 nm, respectively (Jiang et al, 2007).…”

Section: Methodsmentioning

confidence: 99%

Characterization of a pH-Tolerant Strain Cobetia sp. SASS1 and Its Phenol Degradation Performance Under Salinity Condition

Mei

Zhou

et al. 2019

Front. Microbiol.

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Biological treatment of complex saline phenolic wastewater remains a great challenge due to the low activity of bacterial populations under stressful conditions. Acid mine drainage (AMD) as a typically extreme environment, shaped unique AMD microbial communities. Microorganisms survived in the AMD environment have evolved various mechanisms of resistance to low pH, high salinity and toxic heavy metals. The primary goal of this work was to determine whether a strain isolated from an AMD could degrade phenol under stressful conditions such as low pH, high salinity and heavy metals. The results suggested that the strain Cobetia sp. SASS1 isolated from AMD presented different physiological characteristics in comparison with five most closely related species. SASS1 can efficiently degrade phenol at wide ranges of pH (3.0–9.0) and NaCl concentration (0–40 g/L), as well as the existence of Cu2+ and Mn2+. Specifically, the SASS1 could completely degrade 1500 mg/L phenol in 80 h at 10 g/L NaCl. Meanwhile, mineralization of phenol was achieved with complete degradation of 900 mg/L phenol and simultaneously COD decreasing from 2239 mg/L to 181.6 mg/L in 36 h. Based on biodegradation metabolites identification and enzyme activities analysis, both ortho-cleavage pathway and benzoic acid pathway for phenol degradation were proposed. These findings suggested that SASS1 was an efficient phenol degrader under salinity and acidic conditions, and could be considered as key population for bioremediation of industrial phenolic wastewaters under stressful conditions.

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“…This works typically for AOPs carried out at circumneutral pHs. Recently, Huang et al [ 6 ] showed that ozonation of benzoic acid (BA) at low pH (2.3) started a self-enhanced radical degradation chain reaction that led to effective removal of acid. The authors [ 6 ] suggested that the intermediate products of BA ozonation enhance •OH production in the system and contribute to its degradation and proposed the following possible reactions [ 6 ]: …”

Section: Introductionmentioning

confidence: 99%

“…Huang et al [ 6 ] also suggested that, during aromatic ring opening, HO • 2 can be formed and subsequently, in reaction with ozone molecules, hydroxyl radicals are generated.…”

Section: Introductionmentioning

confidence: 99%

“…The process can be considered as an autocatalytic reaction since the higher the concentration of organic substrate, the higher the degree of destruction observed. It should be emphasized that this study [ 6 ] was conducted on deionized model water. However natural waters and waste waters contain mineral compounds that can significantly affect the course and effectiveness of the self-enhanced ozonation process.…”

Section: Introductionmentioning

confidence: 99%

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The Role of Sulphate and Phosphate Ions in the Recovery of Benzoic Acid Self-Enhanced Ozonation in Water Containing Bromides

Fijołek¹,

Świetlik²,

Frankowski³

2021

Molecules

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The ozonation of aromatic compounds in low-pH water is ineffective. In an acidic environment, the decomposition of ozone into hydroxyl radicals is limited and insufficient for the degradation of organic pollutants. Radical processes are also strongly inhibited by halogen ions present in the reaction medium, especially at low pH. It was shown that even under such unfavorable conditions, some compounds can initiate radical chain reactions leading to the formation of hydroxyl radicals, thus accelerating the ozonation process, which is referred to as so-called “self-enhanced ozonation”. This paper presents the effect of bromides on “self-enhanced ozonation” of benzoic acid (BA) at pH 2.5. It is the first report to fully and quantitatively describe this process. The presence of only 15 µM bromides in water inhibits ozone decomposition and completely blocks BA degradation. However, the effectiveness of this process can be regained by ozonation in the presence of phosphates or sulphate. The addition of these inorganic salts to the bromide-containing solution helps to recover ozone decomposition and BA degradation efficiency. As part of this research, the fractions of hydroxyl, sulphate and phosphate radicals reacting with benzoic acid and bromides were calculated.

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Self-enhanced ozonation of benzoic acid at acidic pHs

Cited by 50 publications

References 41 publications

The influence of active carbon contaminants on the ozonation mechanism interpretation

The influence of active carbon contaminants on the ozonation mechanism interpretation

Characterization of a pH-Tolerant Strain Cobetia sp. SASS1 and Its Phenol Degradation Performance Under Salinity Condition

The Role of Sulphate and Phosphate Ions in the Recovery of Benzoic Acid Self-Enhanced Ozonation in Water Containing Bromides

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