Modeling of iron activated persulfate oxidation treating reactive azo dye in water matrix

Kušić, Hrvoje; Peternel, Igor; Ukić, Šime; Koprivanac, Natalija; Bolanča, Tomislav; Papić, Sanja; Božić, Ana Lončarić

doi:10.1016/j.cej.2011.05.076

Cited by 196 publications

(65 citation statements)

References 55 publications

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“…As reported above, pH was found as insignificant in the case of UV-C/S 2 O 8 2-process (Figure 1(B)). It is known from the literature that decomposition of persulfate either by UV-C, heat or transition metals results in the generation of highly active SO 4 • -, while in side reactions HSO 4 -is formed, strongly contributing to the lowering of pH [23,25]. Since HSO 4 -would be formed, consequently lowering pH, it can be considered that degradation occurred mainly at acidic conditions regardless initial pH.…”

Section: Resultsmentioning

confidence: 99%

“…The generation of SO 4 • -resembles an AOP based on H 2 O 2 . The peroxide bond of S 2 O 8 2-and H 2 O 2 can be broken by UV irradiation (eqs (1) and (2)) [19,[23][24][25]:…”

Section: Introductionmentioning

confidence: 99%

“…Persulfate, commonly available in a salt form (with K + , Na + and NH 4 + cations) is characterized as a stable, high soluble at the ambient temperature and relatively harmless and environmentally friendly. Accordingly, SO 4 • -is increasingly discussed as an oxidizing agent for degradation of pollutants in water [17][18][19][20][21][22][23][24][25]. Due to its strong electron acceptor ability, SO 4 • -enables the degradation of recalcitrant compounds which are refractory towards HO•.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Cvetnić

Ukić

Kušić

et al. 2017

Journal of Advanced Oxidation Technologies

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Abstract:The conventional water treatment technologies, mostly relying on physical and biological processes, seem to be inadequate for effective removal of priority substances such as pesticides, while advanced oxidation processes showed a good performance for the same purpose. The aim of the study was to evaluate UV-C/H 2 O 2 and UV-C/S 2 O 8 2-processes for treating seven pesticides listed as priority substances (PS-Ps) within the EU Water Framework directive; alachlor, atrazine, chlorfenvinphos, cybutryne, diuron, isoproturon and simazine. The influence of pH and pollutant/oxidant ratio ([PS-P]:[OX]) on the degradation kinetics was evaluated using full factorial plan and response surface modeling. The degradation of PS-Ps by both photooxidation processes obeyed first-order kinetics. Degradation kinetics of PS-Ps is highly depended on [PS-P]: [OX], while pH has minor significance, particularly in UV-C /S 2 O 8 2-process. In most cases degradation kinetics by UV-C /S 2 O 8 2-was several times faster in comparison to UV-C /H 2 O 2 process. In addition, the inhibitory influence of NOM on the degradation of PSs in the mixture was determined.

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Section: Resultsmentioning

confidence: 99%

“…The generation of SO 4 • -resembles an AOP based on H 2 O 2 . The peroxide bond of S 2 O 8 2-and H 2 O 2 can be broken by UV irradiation (eqs (1) and (2)) [19,[23][24][25]:…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Cvetnić

Ukić

Kušić

et al. 2017

Journal of Advanced Oxidation Technologies

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“…In this context, activated persulfate oxidation has emerged as a novel effective remediation technology for the removal of toluene (Do et al 2011;Huang et al 2005;Liang et al 2008Liang et al , 2009. This system generates sulfate radical (SO 4 ion (Fe 2+ ) has the advantages of being inexpensive and nontoxic, and it has been widely applied as a catalyst to effectively activate persulfate (Jiang et al 2013;Kusic et al 2011;Long et al 2014a;Xu et al 2014;Zhao et al 2014). However, some drawbacks are associated with the Fe 2+ /persulfate process.…”

Section: Introductionmentioning

confidence: 99%

Selective oxidative degradation of toluene for the recovery of surfactant by an electro/Fe2+/persulfate process

Long

Zhang

2015

Environ Sci Pollut Res

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An electro/Fe(2+)/persulfate process has been conducted for toluene removal from surfactant (SDS) flushing solution, and the pseudo-second-order reaction rate constant (k2 value) of toluene removal has been optimized by a response surface methodology (RSM). The results indicated that in this process, the reaction between persulfate and externally added Fe(2+) generates sulfate-free radicals, and at the same time, Fe(2+) is electro-regenerated at the cathode by the reduction of Fe(3+). RSM based on Box-Behnken design (BBD) has been applied to analyze the experimental variables, of which the concentrations of persulfate and Fe(2+) showed a positive effect on the rate constant of toluene removal, whereas the concentration of SDS showed a negative effect. The interactions between pairs of variables proved to be significant, such as between SDS, persulfate, and Fe(2+) concentrations. ANOVA results confirmed that the proposed models were accurate and reliable for analysis of the variables of the electro/Fe(2+)/persulfate process. The shapes of the 3D response surfaces and contour plots showed that the SDS, persulfate, and Fe(2+) concentrations substantially affected the k2 value of toluene removal. The results indicated that increasing persulfate or Fe(2+) concentration increased the k2 value, whereas increasing SDS concentration decreased the k2 value. The reaction intermediates have been identified by GC-MS, and a plausible degradation pathway for toluene degradation is proposed.

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“…In addition to this, the stability of sulfate radical was higher than that of hydroxyl radical in aqueous solution (Romero et al, 2010) (reactions 8-9). Also, at high pHs, radicals of sulfate and hydroxyl had scavenging reaction together (reaction 12) which as a result decreases the efficiency (Kusic et al, 2011;Wang et al, 2014).…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Decomposition of sodium dodecylbenzene sulfonate surfactant by Electro/Fe2+-activated Persulfate process from aqueous solutions

Samarghandi¹,

Mehralipour²,

Azarian³

et al. 2017

Global NEST Journal

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The decomposition of sodium dodecylbenzene sulfonate (SDBS), which is a dangerous and anionic surfactant, was investigated by the electro/Fe 2+ /persulfate process from aqueous solutions. The activation of persulfate anion and production of active radicals were performed by means of heat, UV and iron ions (released from iron electrodes). The findings illustrated that the pH value of the solution, initial concentration of persulfate anion, the amount of input voltage and iron dosage were entirely effective in SDBS removal. Nearly 100% of SDBS was removed under the optimum conditions: pH 3, voltage 10 V, anion persulfate concentration 25 mM l -1 , iron ion dosage 0.25 g l -1 and reaction time 25 min. Furthermore, the application of the persulfate anion process in concert with the electrochemical process, in order to generate electrical iron and persulfate activation, had a better performance compared to separate methods.

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Modeling of iron activated persulfate oxidation treating reactive azo dye in water matrix

Cited by 196 publications

References 55 publications

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach

Selective oxidative degradation of toluene for the recovery of surfactant by an electro/Fe2+/persulfate process

Decomposition of sodium dodecylbenzene sulfonate surfactant by Electro/Fe2+-activated Persulfate process from aqueous solutions

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