Synthetic resin, Amberlite XAD-4 was linked covalently
with the third generation supramolecule, octa-O-methoxy resorcin  arene
through -N=N-group to form chelating resin, which has been characterized and
effectively used for the separation and preconcentration of metal ions such as
Ni(II), Cu(II), Zn(II) and Cd(II). Critical parameters such as pH, flow rate,
sorption capacity, breakthrough studies, distribution coefficient,
preconcentration factor, concentration of eluting agents responsible for
quantitative extraction of metal ions were optimized. The synthesized resin
showed good binding affinity towards Ni(II), Cu(II), Zn(II) and Cd(II) under
selective pH conditions. Good breakthrough capacity and fast exchange kinetics
of the resin lead to effective separation of metal ions from their binary and
ternary mixture by column method on the basis of pH and eluting agents. The
resin could be reused for about 8 -10 cycles. The proposed method
having the analytical data with the relative standard deviation (RSD) < 2% and
with recoveries of analytes higher than 98%, reflects upon the
reproducibility and reliability of the method which has been successfully applied
in the separation and determination of Ni(II), Cu(II), Zn(II) and
Cd(II) ions in synthetic, natural and ground water samples.
of green nanotechnology is generating interest of researchers toward
ecofriendly biosynthesis of nanoparticles. Biomolecules present in plant extracts
can be used to reduce metal ions to nanoparticles in a single-step green
synthesis process. This biogenic reduction of metal ion to base metal is quite
rapid, readily conducted at room temperature and pressure, and easily scaled
up. In this study, biosynthesis of stable copper nanoparticles were done using
datura meta leaf extract. These biosynthesized Cu nanoparticles? were characterized by UV/Vis-spectroscopy,
Particle size analyzer (PSA), Transmission electron mictroscopy (TEM), Energy
dispersive X-ray Analysis (EDX),Fourier transform infrared spectroscopy (FTIR).
It was observed that the datura meta leaf extract can reduce copper ions into
copper nanoparticles within 8 to 10 min of reaction time. Thus, this method can
be used for rapid and ecofriendly biosynthesis of stable copper
nanoparticles.Synthesis mediated by plant extracts is environmentally benign.
The reducing agents involved include the various water soluble plant
metabolites (e.g. alkaloids, phenolic compounds, terpenoids) and co-enzymes.
Extracts of a diverse range of plant species have been successfully used in
making nanoparticles. In addition to plant extracts, live plants can be used
for the synthesis. It was found that copper nanoparticles were also found to
exhibit reasonably good antimicrobial activity when compared with standard
Chloramphenicol, which suggests its potential use as antimicrobial agent.
Hence, there is scope to develop new methods for the synthesis of nanoparticles
which should be required inexpensive reagent, less drastic reaction condition