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Sustainable remediation of Hg(II) from wastewater by combo humiresin-
dry cow dung powder

Journal of Environment & Biotechnology Research, Vol. 6, No. 1, Pages 168-178, January 2017

Nisha D. Bhatt, Hemlata K. Bagla

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ABSTRACT

This research addresses an innovative application of dry cow dung powder (DCP), sustainable green biowaste, for
the efficient remediation of toxic Hg(II) ions from aqueous medium. Batch equilibration experiments have been
conducted employing radiotracer technique and the impact of various process parameters have been studied. The
result indicated that 100 mg of DCP could effectively remove 80-82% of Hg(II) (1 mg/mL) within 10 min at pH 3. The
thermodynamic parameters ΔG0, ΔH0 and ΔS0 have been evaluated, and the values obtained were -4.242 kJ/ mol, -
10.421 kJ/mol and 35.672 J/mol K, respectively. These values suggest spontaneous and exothermic process with
high affinity of Hg(II) for DCP. The pseudo- second order kinetic model proved to be the best fitting with
adsorption capacity of 16.0 mg/g and it also indicate the chemisorptive mechanism of DCP. The mechanism
involved in Hg(II) adsorption has been also supported by FTIR, EDAX and desorption studies. DCP has a great
potential in the field of wastewater treatment, which is embossed by successfully fitting in to 3A’s selection
criteria of affordability, adaptability and acceptability. Thus, DCP proves to be one of the best contenders of
green chemistry and the concept of zero waste.
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Journal of Environment and Biotechnology Research
Volume 6, Number 1, 2017, pp. 168-178
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