Photocatalytic Performance of CuxO/TiO2 Deposited by HiPIMS on Polyester under Visible Light LEDs: Oxidants, Ions Effect, and Reactive Oxygen Species Investigation

摘要: In the present study, we propose a new photocatalytic interface prepared by high-power impulse magnetron sputtering (HiPIMS), and investigated for degradation of Reactive Green 12 (RG12) as target contaminant under visible light light-emitting diodes (LEDs) illumination. The CuxO/TiO2 nanoparticulate photocatalyst was sequentially sputtered on polyester (PES). formulation optimized investigating effect different parameters such time CuxO, applied current, deposition mode (direct current sputtering, DCMS or HiPIMS). results showed that fastest RG12 obtained sample at 40 A in HiPIMS mode. better discoloration efficiency 53.4% within 360 min found 4 mg/L initial concentration 0.05% Cuwt/PESwt determined X-ray fluorescence. All samples contained TiO2 under-layer with 0.02% Tiwt/PESwt. By transmission electron microscopy (TEM), both layers were seen uniformly distributed PES fibers. surface area to volume (dye volume) ratio (SA/V) also RG12. presence chemicals (scavengers, oxidant mineral pollution salts) medium studied. optimization amount added hydrogen peroxide (H2O2) potassium persulfate (K2S2O8) detail. Both, H2O2 K2S2O8 drastically affected up 7 6 times reaction rate constants, respectively. Nevertheless, Cu (metallic nanoparticles) NaCl salt inhibited about 2 times, Moreover, systematic study reactive oxygen species’ (ROS) contribution explored help iso-propanol, methanol, dichromate •OH radicals, holes (h+), superoxide ion-scavengers, Scavenging O2− played primary role removal; however, radicals’ photo-generated holes’ (h+) contributions minimal. have good reusability stability 21 cycles. Ions’ release quantified means inductively coupled plasma mass spectrometry (ICP-MS) showing low Cu-ions’ release.