Morus alba- A Potential Sorbent for the Removal of Arsenic: Equilibrium, Kinetic and Thermodynamic Study

  • Mazhar Iqbal Khaskheli Government College University Hyderabad
  • Zaheer Ahmed Chandio Department of Chemistry, Shaheed Benazir Bhutto University, Shaheed Benazirabad, Pakistan
  • Faiz M Khokhar Institute of Advanced Research Studies in Chemical Sciences, University of Sindh, Jamshoro, Pakistan
  • Wahid Bux Jatoi Institute of Chemistry, Shah Abdul Latif University, Khairpur Mir’s, Pakistan
  • Shaista Khan . Molecular Biology (Genetics) Laboratory Medical Research Centre, LUMHS, Jamshoro
  • Abdul M Channa Institute of Advanced Research Studies in Chemical Sciences, University of Sindh, Jamshoro, Pakistan

Abstract

In present study, arsenic (As) uptake potential of an eco-friendly Morus alba (mulberry) leave
biomass was analyzed. Surface properties of the sorbent and its affinities for arsenic ions with
respect to temperature were studied. Freundlich, D-R, Florry-Huggins and Halsey isotherms were
found to be similar with recorded experimental data. Maximum sorption capacities 2.82 mg/g and
4.93 mg/g were calculated for As(III) and As(V) at pH-6 and pH-4, respectively. The energy
values of the sorption 3.31-5.89 (<8) kJ/mole indicated the physisorption. The applicability of
Halsey isotherm supported the heteroporosity of the biomass. Mechanism of the reaction was best
explained by pseudo first order rate, Morris-Weber and Richenberg equations. Intra-particle
diffusion as well as surface sorption was noticed during the study. Equilibrium was achieved up to
120 minutes. Thermodynamically, sorption reaction was endothermic and spontaneous in nature.
Maximum recoveries of As(III) and As(V) were 83.3% and 95.52%, respectively observed with 1
M H2SO4.

Published
Jun 19, 2020
How to Cite
KHASKHELI, Mazhar Iqbal et al. Morus alba- A Potential Sorbent for the Removal of Arsenic: Equilibrium, Kinetic and Thermodynamic Study. Pakistan Journal of Analytical & Environmental Chemistry, [S.l.], v. 21, n. 1, p. 54-63, june 2020. ISSN 2221-5255. Available at: <http://pjaec.pk/index.php/pjaec/article/view/596>. Date accessed: 13 july 2020. doi: http://dx.doi.org/10.21743/pjaec/2020.06.07.