A novel Zn(ii) dithiocarbamate/ZnS nanocomposite for highly efficient Cr⁶⁺ removal from aqueous solutions

Abstract

Removal of hexavalent chromium by Zn(ii) dithiocarbamate/ZnS nanocomposite.

Zn(II) Di‐isobutyldithiocarbamate Complex Enabled Efficient Synthesis of Au/ZnS Nanocomposite Core‐shell in One Pot

“…However, the band corresponding to the C−S vibration was observed around 748 cm −1 , 695 cm −1 , 658 cm −1 . The formation of the Zn(II) di‐isobutyldithiocarbamate complex was further confirmed by the characteristic peaks appeared at 580 cm −1 , 486 cm −1 , 466 cm −1 and 445 cm −1 which are attributed to the stretching vibration of Zn−S bond . Both the formation of Zn (II) di‐isobutyldithiocarbamate complex and the mechanism of the fabrication of core‐ shell Au/ZnS nanostructure was further confirmed by the ATR‐IR Spectroscopy study (fig.…”

“…The C−N vibration bands were observed at 1383 cm − 1, 1178 cm −1 and 1093 cm −1 . Peaks at 993 cm −1 , 968 cm −1 and 881 cm −1 may be attributed to the C=S in the –CSS − group . However, the band corresponding to the C−S vibration was observed around 748 cm −1 , 695 cm −1 , 658 cm −1 .…”

Surfactant-Free Green Synthesis of ZnS QDs with Active Surface Defects for Selective Nanomolar Oxalic Acid Colorimetric Sensors at Room Temperature

“…FTIR study of ZnS QDs before and after the addition of OA is done to understand the interaction between OA and ZnS (Figure b). Clearly, the peaks at 454, 540, 659, 1005, and 1135 cm –1 belong to vibration modes arising from ZnS. − The peaks at 454 and 659 cm –1 represent asymmetric bending and stretching modes of ZnS. The wideband at 3300–3600 cm –1 is due to O–H vibration mode from adsorbed water molecules.…”

Aqueous Adsorption of Heavy Metals on Metal Sulfide Nanomaterials: Synthesis and Application

“…Larger particle agglomerates reduce surface area and adsorption capacity. On the other hand, the chelation of sulfur and HM ions on the particle surface, rather than the ion exchange effect, is responsible for decreasing capacity with increasing NP size [115]. The finer ZnS NPs generate tremendous surface energy leading to a more significant number of coordination vacancies of sulfur atoms on the surface, resulting in a high adsorption capacity.…”

“…Further, HMs having mismatch charges or sizes as zinc are usually adsorbed on ZnS NCs via means other than cation exchange (Table 3). For instance, Malakar et al [115] observed that although cation exchange could explain the removal of Fe 2+ by wurtzite ZnS nanorods in aqueous solution, Fe 3+ favors attachment to the S 2− and surface complexation forming β-FeOOH oxyhydroxide phases as cation exchange would be energetically unstable due to charge mismatch. Mismatch of sizes between Zn 2+ (0.785 A • ) and Pb 2+ (1.33 A • ) hinders effective ion exchange, rendering removal of Pb 2+ pollutant from water in the form of PbS precipitation.…”