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

This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichloroethene (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 addit...

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Veröffentlicht in:Environmental science and pollution research international 2017-11, Vol.24 (31), p.24318-24326
Hauptverfasser: Fu, Xiaori, Brusseau, Mark L., Zang, Xueke, Lu, Shuguang, Zhang, Xiang, Farooq, Usman, Qiu, Zhaofu, Sui, Qian
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container_end_page 24326
container_issue 31
container_start_page 24318
container_title Environmental science and pollution research international
container_volume 24
creator Fu, Xiaori
Brusseau, Mark L.
Zang, Xueke
Lu, Shuguang
Zhang, Xiang
Farooq, Usman
Qiu, Zhaofu
Sui, Qian
description This work demonstrates the impact of hydroxylamine hydrochloride (HAH) addition on enhancing the degradation of trichloroethene (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 (O 2 •- ) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems. However, higher removal rates of radical probe compounds were 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 O 2 •- 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 confirmed based on the total mass balance of the 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 indicate that TCE removal in the HAH/CA/Fe(II)/SPC system is slightly affected by initial solution pH, with higher removal rates under acidic and near neutral conditions. Although HCO 3 − 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 actual groundwater was much significant 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.
doi_str_mv 10.1007/s11356-017-0070-7
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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 indicate that TCE removal in the HAH/CA/Fe(II)/SPC system is slightly affected by initial solution pH, with higher removal rates under acidic and near neutral conditions. Although HCO 3 − 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 actual groundwater was much significant with the addition of HAH to the CA/Fe(II)/SPC system. 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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 indicate that TCE removal in the HAH/CA/Fe(II)/SPC system is slightly affected by initial solution pH, with higher removal rates under acidic and near neutral conditions. Although HCO 3 − 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 actual groundwater was much significant 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.</description><subject>Aquatic Pollution</subject><subject>Atmospheric Protection/Air Quality Control/Air Pollution</subject><subject>Carbonates - chemistry</subject><subject>Chelating Agents - chemistry</subject><subject>Citric acid</subject><subject>Citric Acid - chemistry</subject><subject>Dechlorination</subject><subject>Degradation</subject><subject>Earth and Environmental Science</subject><subject>Ecotoxicology</subject><subject>Environment</subject><subject>Environmental Chemistry</subject><subject>Environmental Health</subject><subject>Environmental Restoration and Remediation - methods</subject><subject>Environmental science</subject><subject>Ferrous Compounds - chemistry</subject><subject>Formic acid</subject><subject>Free radicals</subject><subject>Groundwater</subject><subject>Groundwater - analysis</subject><subject>Groundwater pollution</subject><subject>Hydroxyl radicals</subject><subject>Hydroxylamine</subject><subject>Hydroxylamine - chemistry</subject><subject>Iron</subject><subject>Mineralization</subject><subject>pH effects</subject><subject>Research Article</subject><subject>Superoxide</subject><subject>Trichloroethylene</subject><subject>Trichloroethylene - chemistry</subject><subject>Waste Water Technology</subject><subject>Water Management</subject><subject>Water Pollutants, Chemical - chemistry</subject><subject>Water Pollution Control</subject><subject>Water Pollution, Chemical - prevention &amp; 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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 (O 2 •- ) in both CA/Fe(II)/SPC and HAH/CA/Fe(II)/SPC systems. However, higher removal rates of radical probe compounds were 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 O 2 •- 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 confirmed based on the total mass balance of the released Cl − species. 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subjects Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Carbonates - chemistry
Chelating Agents - chemistry
Citric acid
Citric Acid - chemistry
Dechlorination
Degradation
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental Restoration and Remediation - methods
Environmental science
Ferrous Compounds - chemistry
Formic acid
Free radicals
Groundwater
Groundwater - analysis
Groundwater pollution
Hydroxyl radicals
Hydroxylamine
Hydroxylamine - chemistry
Iron
Mineralization
pH effects
Research Article
Superoxide
Trichloroethylene
Trichloroethylene - chemistry
Waste Water Technology
Water Management
Water Pollutants, Chemical - chemistry
Water Pollution Control
Water Pollution, Chemical - prevention & control
title Enhanced effect of HAH on citric acid-chelated Fe(II)-catalyzed percarbonate for trichloroethene degradation
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