Benzene depletion by Fe2+-catalyzed sodium percarbonate in aqueous solution

Fu, Xiaori; Gu, Xiaoli; Lu, Shuguang; Miao, Zhouwei; Xu, Minhui; Zhang, Xiang; Qiu, Zhaofu; Sui, Qian

doi:10.1016/j.cej.2014.12.104

Cited by 139 publications

(43 citation statements)

References 32 publications

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“…The pH was measured with a pH meter (Mettler-Toledo DELTA 320, Greifensee, Switzerland). The other specific conditions for the analyses can be found in our previously published paper [36]. …”

Section: Methodsmentioning

confidence: 99%

The destruction of benzene by calcium peroxide activated with Fe(II) in water

Xue

et al. 2016

Chemical Engineering Journal

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The ability of Fe(II)-activated calcium peroxide (CaO2) to remove benzene is examined with a series of batch experiments. The results showed that benzene concentrations were reduced by 20 to 100% within 30 min. The magnitude of removal was dependent on the CaO2/Fe(II)/Benzene molar ratio, with much greater destruction observed for ratios of 4/4/1 or greater. An empirical equation was developed to quantify the destruction rate dependence on reagent composition. The presence of oxidative hydroxyl radicals (HO•) and reductive radicals (primarily O2•−) was identified by probe compound testing and electron paramagnetic resonance (EPR) tests. The results of the EPR tests indicated that the application of CaO2/Fe(II) enabled the radical intensity to remain steady for a relatively long time. The effect of initial solution pH was also investigated, and CaO2/Fe(II) enabled benzene removal over a wide pH range of 3.0~9.0. The results of radical scavenging tests showed that benzene removal occurred primarily by HO• oxidation in the CaO2/Fe(II) system, although reductive radicals also contributed. The intermediates in benzene destruction were identified to be phenol and biphenyl. The results indicate that Fe(II)-activated CaO2 is a feasible approach for treatment of benzene in contaminated groundwater remediation.

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Section: Methodsmentioning

confidence: 99%

The destruction of benzene by calcium peroxide activated with Fe(II) in water

Xue

et al. 2016

Chemical Engineering Journal

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“…Recently, a solid-phase oxidant, percarbonate (2Na 2 CO 3 •3H 2 O 2 , SPC), has been examined as a substitute for the liquid-phase hydrogen peroxide (H 2 O 2 ) [16-18]. As a granulated solid carrier of H 2 O 2 , SPC is easier to transport and able to release H 2 O 2 after mixing with H 2 O (2Na 2 CO 3 •3H 2 O 2 → 2Na 2 CO 3 + 3H 2 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

“…Fu at al. demonstrated the effective degradation of benzene by Fe(II)-catalyzed SPC [16], and their results indicated that Fe(II)-catalyzed SPC could be applied in weakly alkaline conditions for benzene degradation. In addition, effective degradation was observed for actual groundwater systems.…”

Section: Introductionmentioning

confidence: 99%

Enhanced effect of HAH on citric acid-chelated Fe(II)-catalyzed percarbonate for trichloroethene degradation

Brusseau

Zang

et al. 2017

Environ Sci Pollut Res

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This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichoroethene (TCE) by the citric acid (CA)-chelated Fe(II)-catalyzed percarbonate (SPC) system. The results of a series of batch-reactor experiments show that TCE removal with HAH addition was increased from approximately 57% to 79% for a CA concentration of 0.1 mM and from 89 to 99.6% for a 0.5 mM concentration. Free-radical probe tests elucidated the existence of hydroxyl radical (HO•) and superoxide anion radical (O2•-) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems. However, higher removal rates of radical probe compounds was observed in the HAH/CA/Fe(II)/SPC system, indicating that HAH addition enhanced the generation of both free radicals. In addition, increased contribution of O2•- in the HAH/CA/Fe(II)/SPC system compared to the CA/Fe(II)/SPC system was verified by free-radical scavengers tests. Complete TCE dechlorination was indicated based on the total mass balance of released Cl- species. Lower concentrations of formic acid were produced in the later stages of the reaction for the HAH/CA/Fe(II)/SPC system, suggesting that HAH addition favors complete TCE mineralization. Studies of the impact of selected groundwater matrix constituents indicates that TCE removal in the HAH/CA/Fe(II)/SPC system is pH-dependent, with higher removal rates under acidic conditions. Although HCO3- was observed to have an adverse impact on TCE removal for the HAH/CA/Fe(II)/SPC system, the addition of HAH reduced its inhibitory effect compared to the CA/Fe(II)/SPC system. Finally, TCE removal in real groundwater was greater with the addition of HAH to the CA/Fe(II)/SPC system. The study results indicate that HAH amendment has potential to enhance effective remediation of TCE-contaminated groundwater.

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“…Monoaromatic hydrocarbons, such as benzene, toluene, ethylbenzene and xylene isomers (BTEX), are important constituents of crude oil and its derivatives [1,2]. These compounds -which have a relatively high solubility and mobility in water -can account for up to approximately 18% (w/w) of a standard gasoline blend.…”

Section: Introductionmentioning

confidence: 99%

“…These compounds -which have a relatively high solubility and mobility in water -can account for up to approximately 18% (w/w) of a standard gasoline blend. Thus, from accidental leakages of underground fossil fuels storage tanks and pipelines, BTEX can contaminate extensively soils and aquifers, affecting drinking water sources [1,3].…”

Section: Introductionmentioning

confidence: 99%