Separation of heavy metal from water samples—The study of the synthesis of complex compounds of heavy metal with dithiocarbamates

Abstract

The toxicity and persistence of heavy metal (HM) ions may cause several problems to marine organisms and human beings. For this reason, it is growing the interest in the chemistry of sulphur donor ligands such as dithiocarbamates (DDTC), due to their applications particularly in analytical chemistry sciences. The aim of this work has been the study of heavy metal complexes with DDTC and their application in separation techniques for the preconcentration and/or removing of heavy metals from the water solutions or the water ecosystems prior to their analysis. The HM-DDTC complexes were prepared and characterized by elemental analysis, FTIR and UV-Vis spectroscopic methods. The elemental analysis and the yield of the synthesis (97.5-99.9%) revealed a good purity of the complexes. High values of complex formation yields of HM-DDTC complexes is an important parameter for quantitatively removing/and or preconcentration of heavy metal ions from water solution even at low concentration of heavy metals. Significant differences founded between the characteristic parameters of UV/Vis (λmax and ϵmax) and FTIR absorption spectra of the parent DDTC and HM-DDTC complexes revealed the complex formation. The presence of the peaks at the visible spectral zone is important to M(nd(10-m))-L electron charge transfer of the new complexes. The (C=N) (1450-1500 cm(-1)) and the un-splitting (C-S) band (950-1002 cm(-1)) in HM-DDTC FTIR spectra are important to the identification of their bidentate mode (HM[S2CNC4H10]2). The total CHCl3 extraction of trace level heavy metals from water samples after their complex formation with DDTC is reported in this article.

Cerium/diethyldithiocarbamate complex as a novel corrosion inhibitive pigment for AA2024-T3

“…As can be seen in the FT-IR spectra of the specimens, the stretching vibration frequency of the C-N band in thioureide structure (S 2 C-N stretching mode) for the parent DEDTC and Ce-DEDTC complex are 1477.82 cm −1 and 1497.7 cm −1 , respectively 51 . Also, as seen that the absorption peak value for the Ce-DEDTC complex is higher than that for the parent DEDTC.…”

“…This result indicates that the increase in the contribution of the thioureide leads to electrons meso-meric drift from the DEDTC moiety towards the metal center. It also can be seen that the M-S peak in FT-IR spectra of the Ce-DEDTC pigment possesses a negative shift by moving to the lower wavenumber which shows the complex formation 51 .…”

“…Furthermore, the vibration band of the C-S in -CSS group and vibration bands of the C-H in the methyl and methylene groups are detected at the region of 950-1000 cm −1 and 2800-3000 cm −1 , respectively 20,51,52 . Based on the literature, the band appears at the regions of 400-500 cm −1 is related to the vibration bands of the M-S, which M shows the metallic compound in the structure of the complex 51 . Also, it can be mentioned that the dithiocarbamate group can be coordinated by the symmetric or asymmetric vibration bands which are assigned to the both or one of the sulfur atoms, respectively.…”

“…UV-vis spectra of the Ce-DEDTC pigment extract and DEDTC solution contain 3 main absorption bands. The first absorption band appears at 200-230 nm is associated with the π-π* transient of the sulfur nonbonding electrons 51,58 . The second shoulder centered at 230-270 nm is related to the intra-ligand and π → π* transients found on N-C-S and within S-C=S groups 51,58 .…”

Synthesis, Crystal Structure, and Selected Properties of [Au(S2CNH2)2]SCN: A Precursor for Gold Macro‐Needles Consisting of Gold Nanoparticles Glued by Graphitic Carbon Nitride

“…[7,8] These compounds are also used for the removalo ft ransition metalc ations from different fluid media. [9][10][11] In the last few years, dithiocarbamate complexes have been applied as single-sourcep recursors for the preparation of metal sulfides by thermald ecomposition [12][13][14][15][16] or for the generation of sulfide films. [17][18][19][20] The first Au I dithiocarbamatec ompounds were reported by Akerstrçm (1959 [21] ), and after this publicationt he chemistry of such compounds was developedr apidly.…”