Anoxic iron electrocoagulation automatically modulates dissolved oxygen and pH for fast reductive decomplexation and precipitation of Cu(II)-EDTA: The critical role of dissolved Fe(II)

PVDF Nanofiber Modified with ZnO Nanowires/Polydopamine for the Treatment of Sewage Containing Heavy Metals, Organic Dyes, and Bacteria

“…Two hundred milligrams of CuSO 4 •5H 2 O was dissolved in 1 L of deionized water and diluted at different ratios to obtain 60, 70, 80, 90, and 100 mg/L CuSO 4 solutions, respectively. The 1.5 × 1.5 cm 2 PVDF, ZnO-NWs/PVDF, and PDA/ZnO-NWs/PVDF were submerged into 10 mL of these solutions and shaken in a QWZY-X3 three-layer shaking incubator at 25 °C and 100 rpm for different time intervals (10,20,30,40,50, 60, 70, 80, 90, and 100 min) together with the blank group. The shaken solutions were centrifuged at 10,000 rpm for 10 min, and then the supernatants were tested by an ultraviolet−visible spectrophotometer (UV-2600, Shimadzu, Japan).…”

“…For heavy metal ion pollution, copper pollution is the most studied representative model pollutant. At present, the methods used to treat copper-containing sewage mainly include physical and chemical techniques such as reverse osmosis, extraction, adsorption, precipitation, displacement, electrolysis, and other chemical methods. − Among these methods, adsorption is considered one of the most cost-effective and environmentally friendly technologies. Some studies tend to use adsorbents in the powdered state to achieve better contact between the adsorbents and the effluent, thereby enhancing the adsorption efficiency.…”