The complete dechlorination of DDT by magnesium/palladium bimetallic particles

Studies on dechlorination of DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) using magnesium/palladium bimetallic system

“…The above results are in agreement with those obtained following treatment of DDT with Mg 0 /Pd 4+ in 0.05% biosurfactant phase thereby suggesting that substitution of water-acetone with biosurfactant does not affect the pathway of reaction. Our results support the previous observation reported by Engelmann et al wherein DDT was dechlorinated to DPE using water-acetone phase under acidic conditions [13].…”

“…For example Graham and Jovanovic demonstrated dechlorination of pchlorophenol using Fe 0 /Pd in a magnetically stabilized fluidized bed reactor [12]. Engelmann et al dechlorinated 50 ppm DDT using Mg 0 /Pd within 10 min of reaction [13]. In another publication, Engelmann et al reported simultaneous dechlorination of PCBs and DDT using Fe 0 /Pd and Mg 0 /Pd sequentially [14].…”

“…/Pd all the way to diphenylethane under acidic conditions using water-acetone as the reaction phase [13]. However, application of this elegant system for remediation of DDTr contaminated water or soil requires further characterization with respect to reaction kinetics and usage of immobilized palladium for recycling since the noble metal is expensive.…”

Decolourization of azo dyes using magnesium–palladium system

“…Although Fe 0 has been applied extensively for remediation of several pollutants, the major drawbacks are slow reaction rates, rapid passivation of the metal and requirement for strict anaerobic conditions. In comparison, magnesium metal (Mg 0 ) exhibits superior performance and has been used in combination with palladium, an excellent hydrogenation catalyst for the successful and rapid dechlorination of DDT, pentachlorophenol, and phenol [28][29][30]. The major advantageous features of the magnesium-based system are: high negative reduction potential of Mg 2+ /Mg 0 (−2.2 V) as compared to Fe 2+ /Fe 0 (−0.44 V, respectively); high solubility of magnesium hydroxide, reduced passivation of metal as compared to iron and no requirement for creating anaerobic conditions.…”

Dechlorination of DDT, DDD and DDE in soil (slurry) phase using magnesium/palladium system

“…There are numerous studies demonstrating successful dechlorination of a wide range of chlorinated compounds like chlorophenols, DDT, PCBs (polychlorinated biphenyls), chlorinated methanes by zero-valent based catalysts [14][15][16][17][18][19]. The detailed mechanism of this reaction has been proposed by Cheng et al [15,16]. Dechlorination reaction is typically initiated by ionization of zerovalent metals.…”