Synthesis and characterization of a new starch/SnO2 nanocomposite for efficient adsorption of toxic Hg2+ metal ion
Ghfar., Mu. Naushad, Tansir Ahama, Gaurav Sharma, Ala’a H. Al-Muhtaseb, Ahmad B. Albadarin, Mohammad M. Alam, Zeid A. ALOthman, Saad M. Alshehri, Ayman A. . 2016
In this study, starch based nanocomposite (starch/SnO2) was synthesized and used as an effective adsorbent
for the removal of Hg2+ from aqueous medium. The as-prepared starch/SnO2 nanocomposite was
characterized by means of the XPS, XRD, BET, FTIR, SEM and TEM analyses. The effects of contact time,
pH, initial Hg2+ concentration and temperature on the adsorption performance of starch/SnO2 nanocomposite
were investigated thoroughly. The experimental results showed that starch/SnO2 nanocomposite
had high ability to remove Hg2+ ion from aqueous medium. The adsorption of Hg2+ was maximum at the
pH 6 and equilibrium was achieved within 60 min. The pseudo-second-order equation represented the
adsorption kinetics with high correlation coefficient (>0.998) and the Freundlich isotherm model fitted
the adsorption data better than the Langmuir. The maximum adsorption capacity was found to be
192 mg g1 at 25 C which was increased with the temperature, indicated the endothermic adsorption.
The feasibility of Hg2+ adsorption onto starch/SnO2 nanocomposite was also studied thermodynamically
and the results showed that the adsorption was spontaneous and chemical in nature. The adsorption
capacity of the regenerated adsorbents could still be maintained at 94% by the fourth adsorption–desorption
cycle.
In the present study, the effect of various natural food condiments (garlic, ginger,
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cooked camel meat was…
In this study, starch based nanocomposite (starch/SnO2) was synthesized and used as an effective adsorbent
for the removal of Hg2+ from aqueous medium. The as-prepared starch/SnO2…
The zeta or electrokinetic potential describes the nanomaterials potential distribution and it is often a useful parameter to evaluate the adsorption of ionic pollutants on the nanomaterials…