Photocatalytic Performance on Visible Light Induced ZnS QDs‐MgAl Layered Double Hydroxides Hybrids for Methylene Blue Dye Degradation

Abstract

Semiconductor hybrids based photocatalytic reaction is one of the prominent methods to treat wastewater, containing the organic pollutants. In the present work, we report the development of ZnS QDs-LDH hybrid structure for the photocatalytic treatment of methylene blue (MB) dye. The as-synthesized ZnS QDs-LDH hybrid structure was characterized by XRD, FESEM, HRTEM, EDX, XPS, and FTIR to analyze the formation, morphology and chemical structure. The UV-Vis DRS was used to investigate the optical absorption characteristics of the ZnS QDs-LDH hybrid. The photocatalytic performance of the asprepared samples was investigated against the methylene blue dye molecule under UV-Vis light irradiation. The scavenging experiments were carried out in order to probe the radical formation by using EDTA, benzoquinone, and 2-proponal. The cycling experiments were performed to check the stability of the ZnS QDs-LDH hybrid photocatalyst after repeated photodegradation experiments.

Photodegradation Activity of Nitrogen‐rich Graphitic Carbon Nitride Intercalated ZnO\Mg‐Al Layered Double Hydroxide Ternary Nanocomposites on Methylene Blue Dye

“…(i. e.) the even distribution of ZnO intercalated LDH over the surface of g‐C 3 N 4 . It has to be noted that the photocatalytic efficiency reported in the present study, betters our previous research work, in which ZnS QDs‐LDH exhibited a photocatalytic degradation efficiency of 95% …”

LDH Ternary Nanocomposites: g-C3N4 Intercalated ZnO\Mg-Al for Superior Photocatalytic Activity towards Dye Degradation

“…The observed photocatalytic degradation efficiencies of the as-prepared photocatalysts are 32%, 30%, 49% and 96.5% for ZnO, LDH, g-C 3 N 4 , and g-C 3 N 4 \ZnO\Mg-Al LDH ternary nanocomposite, respectively. It has to be noted that the photocatalytic efficiency reported in the present study, betters our previous research work, in which ZnS QDs-LDH [49] exhibited a photocatalytic degradation efficiency of 95%. The enhanced photocatalytic efficiency is originated from the photocatalytic activity of N-rich g-C 3 N 4 , (i.e.,) the improved photocatalytic mechanism could be ascribed to the synergetic effect of graphitic N rich surface which offers more reactive sites for photocatalytic reaction.…”

“…The morphological arrangements of the nanocomposite and its resultant electronic structure, (i.e.) the even distribution of ZnO intercalated LDH over the surface of g-C 3 N 4 [49], collectively contribute to the effective separation of the photogenerated charge carriers. The observed photocatalytic degradation efficiencies of the as-prepared photocatalysts are 32%, 30%, 49% and 96.5% for ZnO, LDH, g-C 3 N 4 , and g-C 3 N 4 \ZnO\Mg-Al LDH ternary nanocomposite, respectively.…”

Solar Induced Photocatalytic Degradation of Methylene Blue by CdS/Ag2O Nanocomposites

“…It clearly demonstrates that the observed degradation efficiency ( %) is 67.2, 71.3, 79.7, 87.1 and 88.8 % for pure CdS, pure Ag 2 O, CA1, CA2 and CA3 respectively. In addition, CdS/Ag 2 O nanocomposite is compared with the previously reported photocatalysts in literatures, and the results are provided in Table S1 …”