Phytoremediation of industrial wastewater potentiality by Typha domingensis

Phytoremediation is increasingly receiving attention as a cost effective technique that uses plants to remediate contaminants from wastewater, soil and sediments. In this study, the ability of Typha domingensis to uptake heavy metals as well as its potential application for phytoremediation was assessed. Pollutant elements concentrations were measured in samples of wastewater, sediments and Typha domingensis collected from industrial wastewater ponds, El-Sadat city, Egypt. This study specifically focused on the capacity of Typha domingensis to absorb and accumulate aluminum, iron, zinc and lead. Results indicated thalTypha domingensis was capable of accumulating the heavy metal ions preferentially from wastewater than from sediments. The accumulation of metals in plant organs attained the highest values in roots, rhizomes and old leaves. Rhizoflltration was found to be the best mechanism to explain Typha domingensis phytoremediation capability

Influence of operating conditions on the removal of Cu, Zn, Cd and Pb ions from wastewater by adsorption

Nile Rose Plant was used to study adsorption of several cations [Cu[2+], Zn[2+], Cd[2+] and Pb[2+]] from wastewater within various experimental conditions. The dried leaves of Nile Rose Plant were used at different adsorbent/ metal ion ratios. The influence of pH, contact time, metal concentration, and adsorbent loading weight on the removal process was investigated. Batch adsorption studies were carried out at room temperature. The adsorption efficiencies were found to be pH dependent, increasing by increasing the pH in the range from 2.5 to 8.5 exept for Pb. The equilibrium time was attained within 60 to 90 min. and the maximum removal percentage was achieved at an adsorbent loading weight of 1.5 g/50 mL mixed ions solution. Isothermal studies showed that the data were best fitted to the Temkin isotherm model. The removal order was found to be Pb[2+]> Zn[2+]> Cu[24]> Cd[2+]. The surface IR-characterization of Nile rose plant showed the presence of many functional groups capable of binding to the metal cations

Chelation behaviour of some lanthanide [III], scandium [III], yttrium [III], thorium [IV] and uranium [VI] complexes with some hydroxy nitrosocoumarins

The stability constants of the lanthanide ions [La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Yb]; Sc, Y, Th and UO22+ ions with some hydroxy nitrosocoumarins were determined in 40% ethanol-water mixture at 25 degree and 0.1 ionic strength. It was found that the stability constants of the complexes increased with increasing ionic radii, from Y to Sm. The so called Gadolinium break was observed with heavier lanthanides. Sc and Th complexes possessed the highest stability constants. The potentiometric measurements and conductimetric titrations showed that 1: 1 and 1: 2 [M: L] complexes were invariably formed

Spectrophotometric studies on some hydroxy nitrosocoumarins

The UV and visible absorption spectra of some hydroxy nitrosocoumarins have been studied in organic solvents of varying polarities. The dependence of the band shift on the nature of substituent, dielectric effect and specific solvation was studied. The acid dissociation constants of the different ionizable groups were determined using the half- height and the modified limiting absorbance methods. The observed transition energy and oscillator strengths were correlated with those calculated from the SCF PPP CI method for molecular orbitals

Investigation of some lanthanide complexes with 1, 3, 5-triphenyl-formazan derivatives applying Potentiometric, TGA, DTGA, IR and PMR studies

The stability constants of [trivalent La, Nd, Sm, Tb, Dy, Ho, Gd, Er, Tm, Yb and Lu] complexes with some 1,3,5-triphenyl-formazan derivatives have been investigated potentiometrically by Sarin's method. The structure of the solid complexes was confirmed by elemental analysis, IR and DMP spectroscopy as well as thermogravimetric and differential thermogravimetric analysis [TGA and DTGA] studies. The stabilities of the formed complexes were correlated with the basicity of the ligands and the ionization potential, electronegativity, ionic radius and atomic number of the metal ions applying born relation. Ionic and covalent characters of the ligand-metal bonds were also studied

Spectral studies and molecular orbital Pariser-ParrPople calculations of some 2-aminopyrimidine schiff bases

UV, IR and NMR spectra of some 2-aminopyriinidine Schiff bases are recorded. Effect of substituent groups on UV bands, IR stretching frequencies and NMR proton chemical shifts is considered. The molecular orbital data obtained are rationalized quantitatively using Pariser-Parr-Pople model with configuration interaction

HMO and SCF PPP CI calculations applied to UV spectra of acetyl pyridines and their N-oxides

HMO and Pariser-Parr-Pople Cl calculations were applied to the UV spectral data of acetyl pyridines and their N-oxides. The correlations revealed several trends and good agreement between theory and experiment. The effect of introducing the auxiliary inductive parameter [AIP] on the HMO calculation was investigated. CT band assignment as well as oscillator strengths and transition moments obtained from PPP calculations were also considered

Spectrophotometric investigation of the reaction between Pd [II] and some 3-pyridylazo dyes

Although there has been interest, within the past few decades, in palladium [II] chelates with pyridylazo dyes from the standpoint of quantitative determination, little has been reported concerning the relation between the structure of the ligands and the stability of their metal chelates. The applications of pyridylazo dyes in analytical chemistry were mainly devoted to the use of 2-pyridylazo dyes but the use of 3-pyridylazo does in chemical analysis as yet is very limited. The present work comprises Spectrophotometric studies of Pd [II] chelates with some 3-pyridylazo dyes [I] with the aim of correlating the stability constants and the ionization constants, pKa, of the ligand with the molecular structure. The micro determination of Pd [II] is also investigated