Transformations of chloro and nitro groups during the peroxymonosulfate-based oxidation of 4-chloro-2-nitrophenol

Zhou, Jun; Xiao, Jiuhua; Xiao, Dongxue; Guo, Yaoguang; Fang, Changling; Lou, Xiaoyi; Wang, Zhaohui; Liu, Jianshe

doi:10.1016/j.chemosphere.2015.05.027

Cited by 110 publications

(20 citation statements)

References 35 publications

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“…16 Although PMS-based processes are known as promising AOPs for the degradation of various organics, their reaction efficiency would be greatly constrained by the presence of chloride, a common inorganic anion in industrial wastewater. [18][19][20][21][22] Chloride, from external (saline wastewater 20 ) or internal (released from dechlorination of chlorinated compounds 18,21 ) sources, may scavenge SO 4 c À or cOH to form less reactive chlorine radical (Clc/Cl 2 c À ) or react with PMS to generate Cl 2 /HClO. In the past, effects of external or internal chloride were oen separately investigated.…”

Section: Introductionmentioning

confidence: 99%

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?

et al. 2017

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“…In our previous studies, Wang et al (2011) observed a typical dual effect of chloride on AO7 bleaching in Co/PMS system. Similarly, Zhou et al (2015) also reported the dual effect of chloride on the 4-chloro-2-nitrophenol (4C2NP) degradation process, whereas no measurable impact was found with low level of nitrate on Co/PMS process. To our best knowledge, there are usually various kinds of inorganic ions with different concentration in wastewater limiting the application of AOPs.…”

Section: Introductionmentioning

confidence: 95%

On the kinetics of organic pollutant degradation with Co2+/peroxymonosulfate process: When ammonium meets chloride

et al. 2017

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A large amount of chloride and ammonium ions were produced and released from industrial processes with non-biodegradable organic pollutants to affect efficiencies of advanced oxidation processes (AOPs). Here, the influences of chloride and ammonium ions on Co/peroxymonosulfate (Co/PMS) reaction system, a widely used AOPs to produce sulfate radicals, were investigated by examining the degradation efficiency of an azo dye (Acid Orange 7, AO7). The experimental results showed that a significant decrease in the degradation rate of AO7 was observed in the presence of NH, while a dual effect of chloride on AO7 bleaching appeared. The presence of NHCl was unfavorable for AO7 degradation at low concentration (<20 mM), whereas further addition of NHCl (>20 mM) apparently accelerated AO7 discoloration rate. The apparent effects of the two co-existing inorganic ions were determined by roles of the dominating ions at varied molar ratio of [NH]/[Cl]. The present study may have technical implications for the treatment of industrial wastewater containing diverse ions in practice.

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“…This was a result of the chloride atoms in the benzene ring, which were released due to the SO 4 •− attack, and then became oxidized to the radical form by sulfate radicals. The chlorine radicals would react with MCPs or their intermediates to generate some chlorinated products [15,37].…”

Section: Identification Of Chlorinated Intermediatesmentioning

confidence: 99%

Monochlorophenols degradation by UV/persulfate is immune to the presence of chloride: Illusion or reality?

Fang

Lou

Huang

et al. 2017

Chemical Engineering Journal

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The efficiency and, accordingly, the success of the advanced oxidation processes (AOPs) has generally been evaluated on the basis of degradation kinetics. In practice, chloride in saline wastewater is often found to inhibit degradation processes. Therefore its highly desirable to develop more effective processes which are not affected by chloride. In this study, no significant interference of chloride with monochlorophenols (MCPs, e.g. 2-CP, 3-CP and 4-CP) degradation by the UV photoactivated persulfate (UV/PS) process has been observed. This indicated the "illusion" that the UV/PS process might have been an appropriate technology working under saline conditions. To further evaluate its applicability, the generation of reaction intermediates, of adsorbable organic halogen (AOX) accumulation and of acute toxicity of MCPs in the UV/PS system were examined. In reality, several aromatic chlorinated compounds (number of chlorine atoms ≥ 2), such as dichlorophenols and 2,3,5,3',5'-pentachloro-biphenyl, were identified and quantified. An accumulation and relative increase of AOX with reaction time was observed in the UV/PS/Cl system. The acute toxicity tests with Photobacterium phosphoreum indicated that the inhibition effect of UV/PS reactions increased with reaction time regardless of the presence of chloride or not. The results of this study might be helpful for assessing the PS-based technologies for saline wastewater treatment.

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Transformations of chloro and nitro groups during the peroxymonosulfate-based oxidation of 4-chloro-2-nitrophenol

Cited by 110 publications

References 35 publications

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?

On the kinetics of organic pollutant degradation with Co2+/peroxymonosulfate process: When ammonium meets chloride

Monochlorophenols degradation by UV/persulfate is immune to the presence of chloride: Illusion or reality?

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Transformations of chloro and nitro groups during the peroxymonosulfate-based oxidation of 4-chloro-2-nitrophenol

Cited by 110 publications

References 35 publications

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl− system: two sides of the same coin?

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl− system: two sides of the same coin?

On the kinetics of organic pollutant degradation with Co2+/peroxymonosulfate process: When ammonium meets chloride

Monochlorophenols degradation by UV/persulfate is immune to the presence of chloride: Illusion or reality?

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Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?

Both degradation and AOX accumulation are significantly enhanced in UV/peroxymonosulfate/4-chlorophenol/Cl⁻ system: two sides of the same coin?