Dechlorination of polychlorinated biphenyls by iron and its oxides

Kinetic analysis for the interpretation of polychlorinated biphenyls removal mechanism

“…The chemicals (contaminated transformer oil, methanol and triethyl‐amine [Et 3 N]) were utilized for the dechlorination reaction in front of Pd/MWCNTs. As it was reported in other research, specific surface, and pore volume of the catalyst before and after the reaction in front of an inert atmosphere could be remained unaffected and the good efficiency may be observed in catalytic dechlorination, therefore Argon (grade 5) was used for removing PCBs in the present work 17,18 …”

“…The dechlorination order of PCB isomers was studied in some research utilizing density functional theory (DFT) calculations and the calculated results for the C–Cl bond energy order was (para < meta < ortho) 13 . Moreover, it was reported that the dechlorination order of PCB isomer reactive characteristics of chlorine atoms located on the benzene rings followed the order para > meta > ortho and the efficiency of the chlorine removal reaction is related to the location of the chlorine atom on the biphenyl ring 17–19 …”

“…13 Moreover, it was reported that the dechlorination order of PCB isomer reactive characteristics of chlorine atoms located on the benzene rings followed the order para > meta > ortho and the efficiency of the chlorine removal reaction is related to the location of the chlorine atom on the biphenyl ring. [17][18][19] PCBs' removal usually contains complicated reactions with production of intermediate substances. 20 Generally, modeling multiple and partial reactions were performed utilizing different models such as pseudo-firstorder, pseudo-second-order, and fractional-order Avrami models.…”

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

“…No matter which PCB congener is tested, Fe3O4 shows the highest activity. Reactive characteristics of Cl atoms on benzene rings followed para > meta > ortho [372]. Nano-sized hybrid Fe 0 and Fe3O4 efficiently degrade 3,3′,4,4′-tetrachlorobiphenyl (PCB77).…”

Degradation of one-side fully-chlorinated 1,2,3,4-tetrachloronaphthalene over Fe–Al composite oxides and its hypothesized reaction mechanism

“…Catalytic dechlorination reactions that can be conducted at low temperatures have attracted considerable attention, because they allow for the conversion of aromatic chlorohydrocarbons into less or not toxic chemicals. [14][15][16] A variety of different metal oxides have been investigated for the degradation of POPs. Nomura et al investigated the degradation of PCNs by the mechanochemical treatment of the materials with CaO and found that complete decomposition required only one hour of milling.…”