Schwertmannite Synthesis through Ferrous Ion Chemical Oxidation under Different H2O2 Supply Rates and Its Removal Efficiency for Arsenic from Contaminated Groundwater

• DOI: 10.1371/journal.pone.0138891
• Publication Date: 2015-09-23T18:19:08Z
• Authors: Fenwu Liu; Jun Zhou; Shasha Zhang; Lanlan Liu; Lixiang Zhou; Wenhua Fan
• Keywords: Schwertmannite

Schwertmannite-mediated removal of arsenic from contaminated water has attracted increasing attention. However, schwertmannite chemical synthesis behavior under different H2O2 supply rates for ferrous ions oxidation is unclear. This study investigated pH, efficiency, and total iron precipitation efficiency during by adding into FeSO4·7H2O solution at rates. Specific surface area (III) capacity have also been studied. Results showed that pH decreased ~3.48 to ~1.96, ~2.06, ~2.12, ~2.14, or ~2.17 after 60 h reaction when the received following corresponding amounts H2O2: 1.80 mL 2 (treatment 1); 0.90 14 2); 0.60 2, 14, 26 3); 0.45 26, 38 4), 0.36 38, 50 5). Slow significantly inhibited but improved specific schwertmannite. For initial 50.0 μg/L (III)-contaminated ~7.0 using 0.25 g/L as an adsorbent, harvested schwertmannite, arsenic(III) were 29.3%, 2.06 m2/g, 81.1%, respectively, in treatment 1. above parameters correspondingly changed 17.3%, 16.30 96.5%, 5.