Environmental Engineering Reference
In-Depth Information
the report of Afkhami et al. ( 2010 ). The pK a value for MG is 6.9 and in aqueous
solution it has two cationic and colourless carbinol forms (Culp and Beland
1996). The balance between these two forms depends on the pH of the solution;
the decrease in the positive charge of adsorbent surface sites can cause a
decrease in the adsorption of SDS.
An effi cient and effective system for heavy metals and dye removal from drinking
water should meet several requirements like high adsorptive capacity, high rate of
adsorption, selectivity etc. The functionalized nanomagnets described here remove
heavy metals (Cr(VI)) and dye (MG) from contaminated water effi ciently by adsorp-
tion and magnetic separation with excellent effi ciency. It was found that the adsorp-
tion capability was increased by increasing the concentration of nanoparticles and it
was pH dependent. This as-synthesized, surface functionalized novel iron oxide
nanoparticle is very promising material as adsorbent and this convenient procedure
is safe, rapid and inexpensive for removal of toxic compounds from water compared
to the other troublesome methods. Further study to optimize the adsorption effi -
ciency should be performed that would develop cost effective, reusable platform to
mitigate the pollution.
Acknowledgement The research work has been carried out with the fi nancial support of
University Grant Commission, Govt. of India (Major Research Project-41-1178/2012(SR)) and
University of Kalyani, Nadia, West Bengal. TEM facility was provided by Dr Pulak Ray, SINP,
Afkhami A, Moosavi R, Madrakian T (2010) Preconcentration and spectrophotometric determina-
tion of low concentrations of malachite green and leuco-malachite green in water samples by
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Bandyopadhyay A, Chatterjee S, Sarkar K (2011) Rapid isolation of genomic DNA from E. coli
XL1 Blue strain approaching bare magnetic nanoparticles. Curr Sci 101:210-214
Bruins MR, Kapil S, Oehma FW (2000) Microbial resistance to metals in the environment.
Ecotoxicol Environ Saf 45:198-207
Chatterjee S, Bandyopadhyay A, Sarkar K (2011) Effect of iron oxide and gold nanoparticles on
bacterial growth leading towards biological application. J Nanobiotechnol 9:34
Hiraide M, Sorouradin MH, Kawaguchi H (1994) Immobilization of dithizone on surfactant-
coated alumina for preconcentration of metal ions. Anal Sci 10:125-128
Li J, Shi Y, Cai Y, Mou S, Jiang G (2008) Adsorption of di-ethyl-phthalate from aqueous solutions
with surfactant-coated nano/microsized alumina. Chem Eng J 140:214-220
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