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

Complete dechlorination of pentachlorophenol using palladized bacterial cellulose in a rotating catalyst contact reactor

“…Reduc-tive dechlorination by zero-valent metals such as Mg 0 or Fe 0 is very slow and often incomplete. On the other hand, bimetallic systems such as Fe 0 /palladium or Mg 0 /palladium can achieve near complete dechlorination of recalcitrant pollutants such as DDT, DDD, DDE and chlorophenols [11][12][13]. However, advantages of bimetallic system such as high rate of reaction, efficiency, mild reaction conditions, and requirement for minimal follow-up treatment, will be defeated if reactor design does not permit the reuse and recovery of expensive catalysts such as palladium through immobilization on suitable support matrices.…”

Effect of pH on DDT degradation in aqueous solution using bimetallic Ni/Fe nanoparticles

“…DDT stock solution (100 g/mL) was prepared in analyticalgrade acetone, and diluted with a water-acetone solution, which had been deoxygenated by purging N 2 for 1 h. The final water-acetone ratio was adjusted to 9:1 (v/v) using water or acetone, referential to Gautam's study [15]. 150 mL of DDT solution with desired concentration was then added into a 150-mL glass reactor.…”

“…Laboratory researches showed that the hydrodechlorination pathway happens under neutral or acidic condition using zerovalent metals and bimetallic systems, higher pH could quench the hydrodechlorination reaction of DDT [15,17]. Sayles et al [17] reported that no transformations of DDT were observed in reactors with addition of 25 mM NaOH and zero-valent iron.…”

Application of Nanoscale Zero-Valent Iron in the Remediation of DDT from Contaminated Water

“…However, some organochlorine pesticides are still used -e.g. DDT [(1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane)] (Figure 1) which is used to control malaria in some developing countries [1][2][3][4] . WHO classified the DDT among the twelve persistent organic pollutants to eliminate urgently because it is characterized by a strong solubility in greases, which involves an accumulation in fat tissues of the living organisms.…”

“…NZVI is an effective reductant for a wide variety of reducible contaminants including chlorinated organic compounds, heavy metal ions and oxo-anions which is non-toxic and relatively inexpensive [11][12][13] . The practical applicability of these NZVI particles lies in the fact to get oxidized into +2 and +3 oxidation states thereby reducing other organic as well as inorganic impurities (Figure 2 RCl + H + + 2e − → RH + Cl − (2) From a thermodynamic perspective, the coupling of the reactions [1] and [2] is often energetically highly favorable:…”