Weak magnetic field significantly enhances selenite removal kinetics by zero valent iron

Enhanced paramagnetic Cu2+ ions removal by coupling a weak magnetic field with zero valent iron

“…Evidently, the application of WMF induced a significant improvement on the kinetics of Cu 2+ removal over the pH range of 3.0-6.0. When pH was increased from 3.0 to 6.0, the removal efficiency of Cu 2+ in 2 h dropped sharply from 97.5% to 4.5% without WMF, because ZVI corrosion was a process consuming hydrogen ion (H + ) [16]. However, over 99% of Cu 2+ could be sequestered by ZVI in 30 min over the pH range of 3.0-6.0 upon the application of a WMF, implying that the WMF compensated the strong pH dependence of Cu 2+ removal.…”

“…Our previous studies showed that the application of a weak magnetic field (WMF) could promote ZVI corrosion and significantly enhance Se(IV) removal by both pristine ZVI and aged ZVI [16,17], and greatly improve As(V) and As(III) removal by ZVI at pH ini 3.0-9.0 [18]. Liang et al [17] conducted numerical simulation to evaluate the flux density distribution near the ZVI sphere surface and revealed that the observed WMF effects arose from the ferromagnetism of ZVI and the paramagnetism of Fe 2+ .…”

The Use of Acid-Washed Iron/Aluminum Mixture in Permeable Reactive Barrier for the Elimination of Different Heavy Metal Ions From Water

“…Furthermore, the decrease of permeability with the accumulation of sediment between the initial holes as a result of sticking the locally produced factors is another problem of using the ZVI (8). In recent years, various modifications have been introduced to this method, including the ZVI nanoparticle strategy, bimetallic alloys and the creation of a magnetic field (11)(12)(13). ZVI nanoparticles are smaller in size compared to the ZVI and are relatively expensive due to the high cost of reagent precursors and the combination of their integration processes Open Access Scan to access more free content (10,12).…”

Factors affecting p-nitrophenol removal by microscale zero-valent iron coupling with weak magnetic field (WMF)

“…Recently, Guan et al 19,20 have done many comprehensive studies on weak magnetic eld (WMF) enhancing the removal of several heavy metals by microscale ZVI. The application of an inhomogeneous weak magnetic eld (WMF) (B max < 20 mT) could signicantly enhance Se(IV) removal by both pristine ZVI and aged ZVI 19,20 and greatly improve As(V) and As(III) removal by Fe 0 at pH ini 3.0-9.0.…”

“…The application of an inhomogeneous weak magnetic eld (WMF) (B max < 20 mT) could signicantly enhance Se(IV) removal by both pristine ZVI and aged ZVI 19,20 and greatly improve As(V) and As(III) removal by Fe 0 at pH ini 3.0-9.0. 21 The accelerated Se(IV), As(III) and As(V …”