Degradation of carbon tetrachloride in aqueous solution in the thermally activated persulfate system

Xu, Minhui; Gu, Xiaoli; Lu, Shuguang; Qiu, Zhaofu; Sui, Qian; Miao, Zhouwei; Zang, Xueke; Wu, Xiaoliang

doi:10.1016/j.jhazmat.2014.12.031

Cited by 83 publications

(18 citation statements)

References 56 publications

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“…1. This was contributed to the generation of O -2 $ which was responsible for the degradation of CT in the system and also had been demonstrated in our previous study [20]. Although O -2 $ is a reactive radical for CT degradation in the thermally activated system, O -2 $ is characterized by low reactivity in pure water due to its high degree solvation, reduced lifetime and reactivity of O -2 $, therefore, CT degradation was relatively slow in the thermally activated PS system.…”

Section: Resultssupporting

confidence: 79%

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Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Miao

et al. 2015

Front. Environ. Sci. Eng.

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The thermally activated persulfate (PS) degradation of carbon tetrachloride (CT) in the presence of formic acid (FA) was investigated. The results indicated that CT degradation followed a zero order kinetic model, and CO -2 $ was responsible for the degradation of CT confirmed by radical scavenger tests. CT degradation rate increased with increasing PS or FA dosage, and the initial CT had no effect on CT degradation rate. However, the initial solution pH had effect on the degradation of CT, and the best CT degradation occurred at initial pH 6. Clhad a negative effect on CT degradation, and high concentration of Cl -displayed much strong inhibition. Ten mmol$L -1 HCO -3 promoted CT degradation, while 100 mmol$L -1 NO -3 inhibited the degradation of CT, but SO 2 -4 promoted CT degradation in the presence of FA. The measured Cl -concentration released into solution along with CT degradation was 75.8% of the total theoretical dechlorination yield, but no chlorinated intermediates were detected. The split of C-Cl was proposed as the possible reaction pathways in CT degradation. In conclusion, this study strongly demonstrated that the thermally activated PS system in the presence of FA is a promising technique in in situ chemical oxidation (ISCO) remediation for CT contaminated site.

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Section: Resultssupporting

confidence: 79%

“…HCO -3 might also react with SO -4 $ and HO$ as Eqs. (19) and (20), then reduce the generation of CO -2 $ through Eqs. (4)- (8), and finally inhibited CT degradation [32].…”

Section: Effect Of Solution Matrix On Ct Degradationmentioning

confidence: 99%

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Miao

et al. 2015

Front. Environ. Sci. Eng.

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“…But the high cost of heat and light application limits the widespread use of thermal and UV methods. Among all the tested effective transition metals, iron is the most preferred because it widely exists in nature so that it is cost-effective and environmentally friendly [9]. Both homogeneous and heterogeneous iron catalyst can be used as the activator for persulfate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of iron-based metal-organic framework MIL-53 as an efficient catalyst to activate persulfate for the degradation of Orange G in aqueous solution

Guan

et al. 2018

Applied Catalysis A: General

144

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A series of MIL-53(Fe) materials were synthesized using a solvothermal method under different temperature and time conditions and were used as catalysts to activate persulfate and degrade Orange G (OG). Influences of the above conditions on the crystal structure and catalytic behavior were investigated. Degradation of OG under different conditions was evaluated, and the possible activation mechanism was speculated. The results indicate that high synthesis temperature (larger than 170 °C) leads to poor crystallinity and low catalytic activity, while MIL-53(Fe) cannot fully develop at low temperature (100 or 120 °C). The extension of synthesis time from 5 h to 3 d can increase the crystallinity of the samples, but weakened the catalytic activity, which was caused by the reduction of BET surface area and the amount of Fe (II)-coordinative unsaturated sites. Among all the samples, MIL-53(Fe)-A possesses the best crystal structure and catalytic activity. In optimal conditions, OG can be totally decolorized after degradation for 90 min, and a removal rate of 74% for COD was attained after 120 min. The initial solution pH had great influence on OG degradation, with the greatest removal in acidic pH environment. ESR spectra showed that sulfate radical (SO4−·), hydroxyl radical (OH·), persulfate radical (S2O8−·), and superoxide radical (O2·) exist in this system under acidic conditions. Furthermore, with the increase of pH, the relative amount of O2· increases while that of OH· and SO4−· decreases, resulting in a reduced oxidizing capacity of the system.

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“…Unlike the ·OH radical, •CO3 -species can reach a higher steady-state concentration (10 -13 -10 -15 M) in sunlit natural water, which can be ascribed to a less efficient scavenging by DOM and weak self-quenching [15,16]. Commonly, •CO3 -radicals are produced through the oxidation of carbonate or bicarbonate ions by •OH, •SO4 -, and excited triplet state aromatic ketones, or formed by the photochemical reaction of metal-carbonate complexes [17][18][19][20], as described by Eqs. (1)-(4):…”

Section: Introductionmentioning

confidence: 99%

Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO2-seashell composites: Removal and transformation pathways

Wang

Qian

Chen

et al. 2020

Chinese Journal of Catalysis

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Degradation of carbon tetrachloride in aqueous solution in the thermally activated persulfate system

Cited by 83 publications

References 56 publications

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Synthesis of iron-based metal-organic framework MIL-53 as an efficient catalyst to activate persulfate for the degradation of Orange G in aqueous solution

Significant role of carbonate radicals in tetracycline hydrochloride degradation based on solar light-driven TiO2-seashell composites: Removal and transformation pathways

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