Rapid reductive dechlorination of atrazine by zero-valent iron under acidic conditions

Effects of solvent, pH, salts and resin fatty acids on the dechlorination of pentachlorophenol using magnesium–silver and magnesium–palladium bimetallic systems

“…It may be also noted from Table 1 that substantial sorption of PCP (∼2 mg L −1 ) on the residual solid surfaces was observed for experiments conducted at pH value of 6.0 while almost complete dissolution of magnesium was observed at the end of 45 min of reaction conducted at pH 4.0. Linear increase in the reaction rate constant with decrease in reaction pH has been also reported for the dechlorination of carbon tetrachloride, atrazine, and trichloroethylene using Fe 0 by Matheson and Tratnyek [20], Dombek et al [21], and Chen et al [22], respectively. Based on the results presented in Table 1, the optimum pH for PCP dechlorination by Mg/Pd system may be considered to be ∼5.5 which required nominal dosing (70 mM) of acid.…”

“…However most of the studies on dechlorination by bimetallic or zero-valent metal systems have been carried out using pure solutions of chlorinated organic pollutants. Very sparse literature related to the effects of reaction phase pH [15,[20][21][22], type of organic co-solvent [23][24][25] and impurities (co-pollutants) other than the target compound is available. Studies on the effect(s) of various environmental parameters as listed above are relevant for assessing the applicability of bimetallic systems for remediation of groundwater or raw industrial effluents containing chlorinated organic compounds.…”

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“…For chemical degradation of atrazine, many new techniques have been explored. These include photocatalytic degradation (Minero et al, 1996), advanced oxidation (Arántegui et al, 1995), Electrocatalytic dechlorination (Monson et al, 1998;Stock and Bunce, 2002), and reductive degradation by the use of zero-valent iron (Dombek et al, 2001), and Fenton reactions (Arnold et al, 1995). Chemical methods for atrazine breakdown was done with the help of Fenton's reagent (Larson et al, 1991).…”

Review. An overview on the environmental behaviour of pesticide residues in soils

“…Treatment with zerovalent iron (Fe 0 ) has been shown to promote reductive dechlorination of several pesticides (Eykholt and Davenport, 1998;Monson et al, 1998;Comfort et al, 2001;Dombeck et al, 2001;Shea et al, 2004). The use of Fe 0 to treat pesticide-contaminated soils is based on the fact that many pesticides contain moieties that can be reduced when coupled to the oxidation of iron metal, with Fe 0 and Fe(II) serving as reductants playing pH a decisive role in the process.…”