Photocatalytic Degradation of Municipal Wastewater and Brilliant Blue Dye Using Hydrothermally Synthesized Surface-Modified Silver-Doped ZnO Designer Particles

Abstract

Photocatalytic degradation of local municipal wastewater and brilliant blue FCF dye were investigated using silver-doped ZnO designer particles. The silver-doped ZnO designer particles were synthesized under mild hydrothermal conditions (T = 150-250 • C, P =autogeneous, experimental duration = 16-24 h) in the presence of surface modifiers. The resultant products were characterized using powder XRD, FTIR, Zeta potential, and SEM. Various parameters including catalyst amount, light source, pH, and photocatalytic time duration were studied to find out their effects on photodegradation efficiency with respect to municipal wastewater and brilliant blue dye. The effect of these parameters was evaluated using chemical oxygen demand (COD) and % transmittance analyses. The photodegradation results showed that the surface-modified silver-doped ZnO designer particles had higher efficiency compared to the reagent-grade ZnO in photodegradation of municipal wastewater and brilliant blue dye.

Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

“…Increase in the degradation efficiency under the alkaline conditions could be attributed to the increase in hydroxyl ions, which induce more hydroxyl radical formation. In acidic condition, the per-hydroxyl radical can form hydrogen peroxide, which in turn gives rise to the hydroxyl radical [26], making the reaction slower.…”

Effects of precursor concentration and reaction time on sonochemically synthesized ZnO nanoparticles

“…The peaks at 1052 and 830 cm -1 are assigned to the ν 1 and ν 2 stretches of carbonate and are consistent with the carbonates being bound to an octahedral and tetrahedral zinc centre as expected in the hydrozincite structure 20 . In addition, the band centered at 2345 cm -1 is present exclusively in samples with Zn 5 (OH) 6 (CO 3 ) 2 (samples F1 and F2) and is attributed to the absorption of atmospheric CO 2 on the metallic cation 21 . Interestingly, almost identical absorptions due to CO 2 are found in hydrozincite in the literature 19 .…”

Synthesis, Characterization, and Photocatalysis of ZnO and Er‐Doped ZnO

“…All of the spectra showed two emission bands located at 396 and 484 nm. While the sharper 396-nm emission band has typically been assigned to the near-band-edge emission in ZnO [18], the band in the visible spectral range (showing a peak at 484 nm) has been attributed to the recombination of photogenerated holes with singly ionized charge states of the intrinsic defects such as oxygen vacancies, Zn interstitials, or impurities [19][20][21][22].…”