Background: The effective removal of heavy metals from aqueous wastes is among the
most important issues for many industrialized countries. Present paper reports about the synthesis
of copper neem urea complex (CNU) and its characterization using elemental and spectroscopic
techniques such as IR, NMR, and ESR.
Methods: The NPs of ZnO and doped with SiO2 which was extracted from industrial ash’s) was
synthesized by precipitation method and characterized through UV, SEM-EDX and XRD techniques.
Three low cost adsorbents such as synthetic ZnO, nano ZnO and doped ZnO with SiO2
were chosen for the adsorption of copper surfactant complex of urea from non-aqueous solutions
i.e. petroleum ether. Effect of various parameters like contact time, pH, adsorbent dosage, temperature
and initial metal concentration on the removal through degradation and adsorption of
CNU were investigated and optimized.
Results: Isothermal studies indicated that the adsorption of CNU followed Langmuir adsorption
isotherm. Kinetic studies indicated that removal of the CNU by the three adsorbents followed
second order kinetics. With a maximum adsorption capacity of 7.58 mg/g using all three adsorbents
showed an effective and efficient removal 95.8% of CNU from non-aqueous solutions by using
ZnO doped with SiO2 compare to synthetic ZnO and nano ZnO. This is the first report of removal
of the CNU complex based on the three adsorbents.
Conclusion: The potential of application for the treatment of solutions containing these complexes
in multi-metal solutions is indicated.