Changes in activation energy and kinetics of heat-activated persulfate oxidation of phenol in response to changes in pH and temperature

Ma, Jie; Li, Haiyan; Chi, Liping; Chen, Hongkun; Chen, Changzhao

doi:10.1016/j.chemosphere.2017.09.051

Cited by 87 publications

(20 citation statements)

References 66 publications

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“…where A is the Arrhenius constant, E a is the apparent activation energy (kJ mol À1 ), R is the universal gas constant (8.314 Â 10 À3 kJ mol À1 K À1 ), and T is the absolute temperature (K). This correlation enables the determination of the apparent activation energy which is 135.24 kJ mol À1 close to the ones obtained for the degradation of p-nitrophenol, Naproxen, Carbamazepine, Triclosan, 1,1,1-Trichloroethane and Phenol by TAP as listed in Table 2 ( Gu et al, 2011;Ghauch et al, 2015;Chen et al, 2016;Gao et al, 2016;Kang et al, 2016;Ma et al, 2017), while lower than Bisphenol A (Olmez-Hanci et al, 2013), higher than Decabromodiphenyl ether and Fluconazole (Peng et al, 2016a;Yang et al, 2017). Ma and co-workers revealed that under the same phenol concentration, PS concentration and active temperature, the E a decreased with the increase in the solution pH, however, under the same pH, increasing the PS concentration did not affect the value of E a .…”

Section: Effect Of Persulfate Dosagesupporting

confidence: 69%

Degradation and mechanism of 2,4-dichlorophenoxyacetic acid (2,4-D) by thermally activated persulfate oxidation

et al. 2018

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The chlorinated phenoxy herbicide of 2,4-dichlorophenoxyacetic acid (2,4-D) was oxidized by thermally activated persulfate (TAP). This herbicide was studied for different persulfate dosages (0.97-7.29 g L), for varying initial pH levels (3-12) and temperatures (25-70 °C). Compared with Fe/PS, TAP could achieve a higher total organic carbon (TOC) removal under wider pH ranges of 3-12. Increasing the mole ratio of PS to 2,4-D favored for the decay of 2,4-D and the best performance was achieved at the ratio of 50. The 2,4-D degradation rate constant highly depended on the initial pH and temperature, in accordance with the Arrhenius model, with an apparent activation energy of 135.24 kJ mol. The study of scavenging radicals and the EPR confirmed the presence of both SO and OH. However, SO was the predominant oxidation radical for 2,4-D decay. The presence of both Cl and CO inhibited the degradation of 2,4-D, whereas the effect of NO could be negligible. Verified by GC/MS, HPLC and ion chromatography, a possible degradation mechanism was proposed.

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Section: Effect Of Persulfate Dosagesupporting

confidence: 69%

Degradation and mechanism of 2,4-dichlorophenoxyacetic acid (2,4-D) by thermally activated persulfate oxidation

et al. 2018

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“…Figure (a) demonstrated the generation of

S {normalO}_{4}^{• -}

and HO • during the TAP process. In general,

S {normalO}_{4}^{• -}

was formed first upon heating and acted as reactant to generate HO • sequentially in the TAP process, as expressed in Eqns (3) and (4)

S {normalO}_{4}^{• -} + {normalOH}^{-} \to S {normalO}_{4}^{2 -} + {normalHO}^{•}

S {normalO}_{4}^{• -} + {normalH}_{2} O \to {normalHO}^{•} + S {normalO}_{4}^{2 -} + {normalH}^{+}

…”

Section: Resultsmentioning

confidence: 99%

“…E a can indicate the sensitivity of the reaction rate to changes in temperature. An improved understanding of E a supplies basic information for predicting the temperature sensitivity of chemical reactions and explaining the reaction mechanisms . Therefore, to explain the temperature dependence of the rate constants, the values of k obs were fitted to the Arrhenius equation as Eqn (10):

\ln k_{normalobs} = \ln A - E_{normala} / (italicRT)

where A is the pre‐exponential factor, E a is the apparent global activation energy (J mol −1 ), R is the universal gas constant (8.314 J mol −1 K −1 ) and T is the absolute temperature (K).…”

Section: Resultsmentioning

confidence: 99%

“…In general, SO •− 4 was formed first upon heating and acted as reactant to generate HO • sequentially in the TAP process, as expressed in Eqns (3) and (4). 24,25…”

Section: Comparison Of Sa Removal Among Different Systems and Identifmentioning

confidence: 99%

“…An improved understanding of E a supplies basic information for predicting the temperature sensitivity of chemical reactions and explaining the reaction mechanisms. 24 Therefore, to explain the temperature dependence of the rate constants, the values of k obs were fitted to the Arrhenius equation as Eqn (10):…”

Section: Effects Of Temperaturementioning

confidence: 99%

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Removal of sulfanilic acid from wastewater by thermally activated persulfate process: oxidation performance and kinetic modeling

Zhou

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Sulfanilic acid (SA) is a highly typical representative sulfonated aromatic amine widely occurring in chemical and pharmaceutical wastewaters. Its release poses potential threats to the environment and human health. Thermally activated persulfate (TAP) is a promising technology for organic matter removal. In this study, TAP is evaluated using the oxidation of SA as a model reaction. RESULTS The oxidation performance of TAP on SA removal was investigated initially under different conditions of temperature, solution pH, persulfate dosage and initial SA concentration. Results showed that SA removal was effectively initiated by the TAP process and fitted well with a pseudo‐first‐order reaction model under all environmental conditions in water, and the yield of relatively low activation energy was 80.8 kJ mol−1 under the optimum conditions. The solution pH exerted almost no influence on SA removal. Sulfate radicals (SnormalO4•−) and hydroxyl radicals (HO•) were identified as major predominant free radicals by the electron paramagnetic resonance (EPR) spectrum and scavenger tests for removing SA during the TAP process. Non‐target natural water constituents can affect the removal rate of SA, such as the chloride ion (Cl−) and the bicarbonate ion (normalHCO3−) promote whereas humic acid (HA) reduces the removal. The total organic carbon (TOC) monitoring results indicated that SA was almost completely mineralized into CO2 and H2O during the 9 h reaction time. CONCLUSION Owing to the generation of highly reactive oxidizing species (SnormalO4•− and HO•), TAP oxidation as an environmentally friendly technology is a favorable option for SA‐containing wastewater treatment usage. © 2019 Society of Chemical Industry

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Carbonaceous Materials‐Based Photothermal Process in Water Treatment: From Originals to Frontier Applications

Hu,

Qin,

et al. 2023

Small

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The photothermal process has attracted considerable attention in water treatment due to its advantages of low energy consumption and high efficiency. In this respect, photothermal materials play a crucial role in the photothermal process. Particularly, carbonaceous materials have emerged as promising candidates for this process because of exceptional photothermal performance. While previous research on carbonaceous materials has primarily focused on photothermal evaporation and sterilization, there is now a growing interest in exploring the potential of photothermal effect‐assisted advanced oxidation processes (AOPs). However, the underlying mechanism of the photothermal effect assisted by carbonaceous materials remains unclear. This review aims to provide a comprehensive review of the photothermal process of carbonaceous materials in water treatment. It begins by introducing the photothermal properties of carbonaceous materials, followed by a discussion on strategies for enhancing these properties. Then, the application of carbonaceous materials‐based photothermal process for water treatment is summarized. This includes both direct photothermal processes such as photothermal evaporation and sterilization, as well as indirect photothermal processes that assisted AOPs. Meanwhile, various mechanisms assisted by the photothermal effect are summarized. Finally, the challenges and opportunities of using carbonaceous materials‐based photothermal processes for water treatment are proposed.

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Changes in activation energy and kinetics of heat-activated persulfate oxidation of phenol in response to changes in pH and temperature

Cited by 87 publications

References 66 publications

Degradation and mechanism of 2,4-dichlorophenoxyacetic acid (2,4-D) by thermally activated persulfate oxidation

Degradation and mechanism of 2,4-dichlorophenoxyacetic acid (2,4-D) by thermally activated persulfate oxidation

Removal of sulfanilic acid from wastewater by thermally activated persulfate process: oxidation performance and kinetic modeling

Carbonaceous Materials‐Based Photothermal Process in Water Treatment: From Originals to Frontier Applications

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