Mechanism of the degradation of individual PCB congeners using mechanically alloyed Mg/Pd in methanol

Automatic pH control system enhances the dechlorination of 2,4,4′-trichlorobiphenyl and extracted PCBs from contaminated soil by nanoscale Fe0 and Pd/Fe0

“…Devor et al (2009) reported that a pseudo-first-order rate constant of k=1.72× 10 −4 L min −1 g −1 (normalized by volume of solution and mass of Mg/Pd used) was obtained for the degradation of PCB-151 by Mg/Pd in methanol. Xu and Bhattacharyya (2007) reported that k SA values were 0.017, 0.068, and 0.166 Lh −1 m −2 for Fe/Pd nanoparticles with 0.6, 2.3, and 5.6 wt.% Pd, respectively.…”

“…Recently, nanoscale zerovalent iron (NZVI) and palladized nanoscale zerovalent iron (NZVI/Pd) have been applied for degrading PCBs (Varanasi et al 2007;Choi et al 2009;Devor et al 2009). NZVI, having a predominantly magnetite shell with large specific surface area and high surface reactivity, is found to be one of the cost-effective materials used for soil remediation (Liu et al 2005;Yak et al 2000;Zhang et al 1998;Wang and Zhang 1997).…”

Remediation of DDTr contaminated soil by the combination of solvent extraction and catalytic hydrodechlorination

“…29 Currently, the most common destructive technique incineration requires extremely high temperature and can lead to the formation of highly noxious by-products (such as polychlorinated dibenzo-p-dioxins and polychlorinated dibenzo-furans) due to incomplete combustion. 30 AOPs including Fenton oxidation, wet oxidation, supercritical water oxidation, and photochemical processes have been widely investigated as effective technology but also have some drawbacks such as need of relatively high temperature and/or pressure, large amount of reagents, and/or complex equipment. [31][32][33][34] Bioremediation is a potential option for the degradation of DDTr in soil, but is rather slow and affected by DDTr toxicity being limited to fairly low concentration.…”

Water-promoted catalytic hydrodechlorination of transformer oil-contained PCBs in liquid system under mild conditions

“…Therefore, it is an urgent task to develop a proper decontamination of PCBs, which should be disposed by 2028 based on Stockholm Convention on Persistent Organic Pollutants (POPs) [3]. Currently, PCBs are mainly being destroyed by incineration [2], which consumes a large amount of fuel and probably produces highly toxic substances, including polychlorinated dibenzo-p-dioxin and polychlorinated dibenzo-furans (known as dioxins) [4,5]. In order to avoid the production of noxious chemicals, various destruction methods have been developed to detoxify PCBs including bioremediation [6,7], super/subcritical degradation [8,9], irradiation [10,11], photochemical degradation [12,13], oxidative degradation [14,15], reductive dechlorination [16][17][18][19][20][21], and so on.…”