Solar and visible active amino porphyrin/SiO2ZnO for the degradation of naphthol blue black

Synthesis, characterization of porphyrin and CdS modified spherical shaped SiO2 for Reactive Red 120 degradation under direct sunlight

“…3), no peak of SiO 2 was detected, suggesting that SiO 2 was amorphous. Although in our previous work [21], the XRD pattern of SiO 2 /ZnO contains both SiO 2 and ZnO peaks, the broad peak of amorphous SiO 2 between degrees 19 and 30 may be merged with CdS peaks appeared at the same region in SiO 2 /CdS composites (Fig. 3).…”

“…5 shows the FT-IR spectra of (a) CdS/SiO 2 , (b) CdS/SiO 2 -TPP and (c) CdS/SiO 2 -TPAPP. The bands appeared between 800 and 1110 cm -1 corresponds to Si-O-Si bonds [21]. A peak observed between 430 and 490 cm −1 is ascribed to the presence of Cd-S bond, peaks observed this region is assigned to Metal-Sulfur bond [33].…”

“…About 500 mg of CdS/SiO 2 composite was dispersed in 20 mL of ethanol under stirring followed by the addition of 500 mg of Glycidoxypropyltrimethoxy silane (GPTMS), is a an exemplary coupling agent and it is able to chemically bond in both metal oxides and amino terminated organic molecules [21]. Then, it was stirred for 6 h at 50 ᴼC, the GPTMS modified CdS/SiO 2 composite was filtered, washed several times with ethanol, to absolutely eradicate the unreacted GPTMS, and made dry in an air oven at 80 ᴼC for 4 h.…”

“…Porphyrins have an acute absorption in the 400-450 nm regions (Soret band) and weak absorption in the 500-700 nm regions (Q bands). More importantly, and when the Soret and Q bands are red-shifted, that improves the overlap between the absorption and solar energy distribution on the earth [16][17][18][19][20][21]. Porphyrin compounds play a pivotal role in the domains viz., photosynthesis, transport and storage of oxygen, and electron transfer.…”

“…Since SiO 2 is an insulator, it is not directly used as a photocatalyst for degradation experiments until mixed with semiconducting materials. In the process of continuous exploration on environmental remediation [20,21]…”