Abstract
The present study reports the synthesis of nano Zinc Oxide (ZnO) and its adsorption behaviour. The ZnO obtained by precipitation method were found to be well-defined nano rods arranged like flower. The shape, size and structure of ZnO were characterized from X-Ray Diffraction (XRD), Energy Dispersive X-ray (EDX) and Scanning Electron Microscope (SEM) analysis. These nano rods were utilized for the adsorption of hexavalent chromium ions [Cr(VI)] from their aqueous solution by using batch adsorption technique. Different physico-chemical parameters such as metal ion concentration, pH, dosage level and equilibrium contact time were studied during adsorption. The amount of chromium adsorption increases with increase in adsorbent dosage, whereas the adsorption was maximum in the first 40 min with optimum value of pH 3. The kinetic of adsorption was best fitted by the pseudo-second-order rate equation. Similarly, the equilibrium adsorption data were fitted well by both Temkin and Freundlich adsorption isotherm models in comparison to Langmuir adsorption model. The adsorption of chromium was supported by EDX and SEM analysis. Moreover, the change in the SEM morphology of ZnO nano rods into nano sheets after adsorption is an interesting observation of the present investigation.
Highlights
Rapid urbanization as well as industrialization adversely affects the environment by polluting both the atmosphere and the aquatic systems
As an extension work of our previous studies with the synthesis of Zinc Oxide (ZnO) nano particles by various methods (VenuGopal and Kamila, 2017), here we report the utilization of the nano ZnO obtained from only one synthesis method for its uniqueness
The prepared nano particles were studied for the removal of Cr(VI) from aqueous solution in batch adsorption technique
Summary
Rapid urbanization as well as industrialization adversely affects the environment by polluting both the atmosphere and the aquatic systems. Different industries require different types of materials for their operation and the heavy metals are found to be the most essential commodities. Industries such as mining, pharmaceuticals, tanneries, electro-plating, chemical-manufacturing units etc., generates huge amount of wastes and effluents. The inadequately treated effluents consist of various toxic metals such as chromium, cadmium, arsenic, nickel, lead, mercury, copper etc,. The toxicities of these metals were well documented by different researchers (Förstner and Wittmann, 1985; Mukherjee, 1986; Nriago, 1988). For human beings, these metals affect in the growth of plants and animals too
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