Dr Naba Kumar Mondal presently holding the position as Assistant professor in the department of Environmental Science, The University of Burdwan, India. Dr Mondal has experience more than 16 years of teaching and research in both Education and Environmental Science (masters degree). His research interest includes: Pure Science:Adsorption Chemistry, Nutrient dynamics, indoor pollution, soil Chemistry, Plant Physiology, Social Science: corporal punishment, development of teaching methodology, noise and its impact on school children etc. Dr Mondal also published about 120 research papers in reputed International and National Journals and four (04) Ph.D. scholars (upto May’ 2014) and has been serving as an guest Editor and reviewer in many prestigious International Journals.


The ability of the gastropod shell dust for removal of phenol from water through adsorption has been investigated in the present study. The effect of various parameters viz. contact time, pH effect (pH 2–10), adsorbent dose (0.05–0.5 g/100 ml), initial phenol concentration (5–20 mg/l) has been investigated to determine the adsorption capacity of gastropod shell dust. The adsorbent was characterized by SEM and FTIR study. The batch mode study results were optimized by Response Surface Methodology (RSM). Based on ANOVA statistical value, the adsorption of phenol onto gastropod shell dust has been found to be highly significant, with very low probability (p) values (<0.0001). The experimental equilibrium data showed good agreement with Langmuir isotherm model. The maximum adsorption capacity was found to be 56.89 mgg-1 at 333 K. Kinetics of the adsorption process was tested by pseudo-first-order and pseudo-second-order kinetics and intra-particle diffusion mechanism. Pseudo-second-order kinetic model provided a better correlation for the experimental data studied in comparison to the pseudo-first-order model. Intra-particle diffusion was not the sole rate-controlling factor. The activation energy of the adsorption process (Ea) was found to be – 0.268 kJmol-1 indicating physisorption nature of phenol adsorption onto gastropod shell dust. A thermodynamic study showed spontaneous nature and feasibility of the adsorption process and negative enthalpy (ΔH0) value indicated that the adsorption process was exothermic. Finally it can be concluded that gastropod shell dust can be used as an effective and low- cost adsorbent to remove phenol from aqueous solution.

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