Effect of pH on ferrous-iron oxidation kinetics of Leptospirillum ferrooxidans in continuous culture

Entrapment of nanoscale zero-valent iron in chitosan beads for hexavalent chromium removal from wastewater

“…At a high temperature, more Cr (VI) diffuses into the beads and is reduced to Cr (III) by NZVI at the accelerated rate. In addition, an increase in the temperature is favorable for the transfer of electrons from NZVI to Cr (VI) [39]. As a result, a fraction of Cr (VI) in the solution will be quickly reduced to Cr (III).…”

Using biochemical system to improve cinnabar dissolution

“…The sulfur particles in the system would be adhered and oxidized to sulfuric acid by the suspended cells. The reaction can inhibit the hydrolyzation of ferric iron (Wang et al, 2007), and maintain the concentration of oxidant, ferric iron (Breed and Hansford, 1999): 2HgS þ 4Fe 3þ þ 3O 2 þ 2H 2 O ! 2Hg 2þ þ 4Fe 2þ þ 2H 2 SO 4 ð6Þ…”

Bioxidative dissolution of cinnabar by iron-oxidizing bacteria

“…In the system a hydrophobic secretion could be produced by A. ferrooxidans [21,22], which brings down the interfacial tension between bacterial cells and the surface of sulfur particles ( BS ) to enhance contact and adhesion. The sulfur particles adhered by A. ferrooxidans can be oxidized farther by the cells: The reaction can inhibit the hydrolyzation of ferric iron [23], and maintain the concentration of oxidant, ferric iron [24]. Substituting Eq.…”