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Use of iron minerals in optimizing the peroxide treatment of contaminated soils
Author(s) -
Watts Richard J.,
Udell Matthew D.,
Monsen Robert M.
Publication year - 1993
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/wer.65.7.5
Subject(s) - goethite , hydrogen peroxide , chemistry , pentachlorophenol , reagent , environmental chemistry , soil water , fenton's reagent , peroxide , nuclear chemistry , organic chemistry , fenton reaction , adsorption , geology , soil science
The treatment of silica sand contaminated with pentachlorophenol (PCP) using the standard Fenton's reagent procedure, sequential addition of iron (II) and H 2 O 2 , and a goethite (α‐FeOOH)‐H 2 O 2 system was investigated. The standard Fenton's procedure oxidized 10 mg/L soluble PCP, but was ineffective in degrading 10 mg/kg or 250 mg/kg particulate and sorbed PCP in silica sand. Sequential addition of excess reagents (480 mg/L iron (II) and 7% H 2 O 2 ) degraded particulate and sorbed PCP, but with high stoichiometric H 2 O 2 requirements. The most efficient system for PCP degradation was the H 2 O 2 ‐goethite system. Although the experimental system used in this research lacks the complexity of natural soils, the data suggest that under proper conditions, the iron oxyhydroxide fractions of the soil matrix catalyze Fenton‐like reactions, and that these mineral‐catalyzed reactions may be the most efficient mechanism for the catalyzed hydrogen peroxide treatment of contaminated soils.