Vol. 7, Issue 6 (2019)
Surface modification of Nano zero Valente iron for improved reactivity and performance against hexavalent chromium - A ground water contaminant
Author(s): M Prasanthrajan and V Jayanthi
Abstract: A detailed survey and sampling were done at different locations of Tiruppur and Vellore to know the chromium contamination in ground water. The ground water samples of Vellore had chromium whereas water samples collected from Tiruppur had no traces of chromium. Nano zero Valente iron particles are highly suitable for ground water contaminant removal due to their small size and high reactivity nature. However the reactivity of iron decreases with time possibly due to formation of metal hydroxides or carbonates that partially passivity the surface. Iron surface loses reactivity on exposure to air as it is oxidized by atmospheric oxygen. NZVI modified with ascorbic acid by pre synthesis approach (A-nZVI) performed better and achieved 100% Cr (VI) removal in 30 minutes of reaction time under pH 4.0. The nZVI particles supported by ascorbic acid showed more stability than the bare nZVI. The size of the A-nZVI particles was in the range of 45 to 60 nm. The ground water collected from the bore wells of Walajahpet and Ranipet contained Cr (VI) in the range of 0.06 to 1.18 mg L-1 and 0.08 to 0.72 mg L-1 respectively. At a dose of 1.0 g A-nZVI/L, 100% of Cr (VI) (30 mg/L) removal was achieved in 30 minutes. Cr (VI) in the water samples collected from the contaminated wells of Vellore were also easily removed using A- nZVI.
Pages: 2766-2771 | 209 Views 48 Downloads
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How to cite this article:
M Prasanthrajan, V Jayanthi. Surface modification of Nano zero Valente iron for improved reactivity and performance against hexavalent chromium - A ground water contaminant. Int J Chem Stud 2019;7(6):2766-2771.
