- hiedit
Research Interests:
In present study, zinc oxide (n-ZnO) nanoparticles were synthesized by simple solution based approaches. Synthesized n-ZnO particles were characterized by XRD, TEM, SEM and FTIR. XRD and TEM confirmed the formation of nanosized zinc oxide... more
In present study, zinc oxide (n-ZnO) nanoparticles were synthesized by simple solution based approaches. Synthesized n-ZnO particles were characterized by XRD, TEM, SEM and FTIR. XRD and TEM confirmed the formation of nanosized zinc oxide particles in the size range of 18–31 nm. n-ZnO nanoparticles were used for the removal of Cd(II) from aqueous solutions. A high (92%) removal Cd(II) from its aqueous solutions with initial concentration of 200 mg/L by n-ZnO particles was achieved. Further, the nanoparticles were efficient at other concentrations also.
Research Interests:
Research Interests:
Application of nanocrystalline zirconia was investigated for the removal of chromium from aqueous solutions. The nanozirconia was synthesized by 'precipitation method'. The parameters namely initial concentration (5–65 ppm), pH (0.5 to... more
Application of nanocrystalline zirconia was investigated for the removal of chromium from aqueous solutions. The nanozirconia was synthesized by 'precipitation method'. The parameters namely initial concentration (5–65 ppm), pH (0.5 to 10.5), adsorbent dose (2 to 10 g/l) and temperature (298 K to 318 K) were optimized employing central composite design of response surface methodology. The removal of Cr was most affected by pH, followed by an initial concentration and adsorbent dose. Maximum removal (%) was achieved at an initial concentration of 20 ppm, pH = 3, adsorbent dose = 4 g/l and temperature 313 K. The experimental data were best fitted in Langmuir's iso-therm equation and the removal followed pseudo second order kinetics. The mechanism of removal was explained by boundary layer diffusion via intraparticle diffusion and was further confirmed by Boyd plot. Thermodynamic parameters revealed that the removal process was spontaneous, endothermic and physiosorptive in nature. Adsor-bent was regenerated with hydroxides (0.1 N NaOH, KOH and NH 4 OH) for further reuse.
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Nanoalumina has been employed for the adsorption of chromium from aqueous solutions. The data for best-fit for linear and non-linear forms of kinetic and isotherm models were compared. Non-linear analysis included error analysis using... more
Nanoalumina has been employed for the adsorption of chromium from aqueous solutions. The data for best-fit for linear and non-linear forms of kinetic and isotherm models were compared. Non-linear analysis included error analysis using 'Solver add-in' of Microsoft Excel, Origin and MATLAB software's curve fitting tool. MATLAB and Origin curve fitting tool (R 2 N 0.96) are better than error analysis method (0.79bR 2 N 0.99) of 'solver add in' for determination of isotherm parameters. Adsorption of chromium on nanoalumina is best explained by Langmuir isotherm model. Linear method is better than non-linear methods to determine the kinetic model. The sum of the square of error among linear and non-linear analysis methods for kinetic models is minimum for linear analysis method (0.008) than all other non-linear analysis methods (0.019–0.478). The adsorption of chromium on nanoalumina is governed by pseudo-second-order kinetics.
Research Interests:
Research Interests:
In the present study, a heterogeneous adsorbent material (HA) was used as an adsorbent for the removal of Cr(VI) from aqueous solutions at laboratory scale. Cr(VI) containing water was treated with heterogeneous adsorbent(HA).Chromium... more
In the present study, a heterogeneous adsorbent material (HA) was used as an adsorbent for the removal of Cr(VI) from aqueous solutions at laboratory scale. Cr(VI) containing water was treated with heterogeneous adsorbent(HA).Chromium solutions of various initial concentrations were treated with adsorbent in batch mode experiments to investigate the adsorption characteristics of heterogeneous adsorbent (HA). Kinetics of adsorption of Cr(VI) ions on adsorbent was investigated by using pseudo first order and second order kinetic models. Removal processes were found to be governed by pseudo second order model. Intraparticle diffusion model was also analyzed for this system. Removal was found to be increased by increasing the temperature from 298 to 318 K which indicates the endothermic nature of the process. Various two parameter isotherm models viz. Langmuir, Freundlich, Elovich, Tempkin, Dubnin–Raduskevich (D–R), Harkin–Jura and BET iso-therm were applied on resultant data for equilibrium modeling. It was observed that heterogeneous adsorbent (HA) particles were highly efficient for the removal of Cr(VI). ª 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University.
Research Interests: Adsorption and Chromium
Nano zirconia was used for the adsorption of Orange G dye from aqueous solutions. The best fit linear and nonlinear equations for the two adsorption isotherms and kinetic models, namely the Langmuir and Freundlich adsorption isotherms and... more
Nano zirconia was used for the adsorption of Orange G dye from aqueous solutions. The best fit linear and nonlinear equations for the two adsorption isotherms and kinetic models, namely the Langmuir and Freundlich adsorption isotherms and pseudo-first-order and pseudo-second-order equations, were compared. The sum of the normalized errors and the coefficient of determination were used to determine the best fit model. The results show that nonlinear forms of isotherms and kinetic equations are more suitable for fitting the experimental data. The adsorption of Orange G over nano zirconia follows the Langmuir isotherm and pseudo-second-order kinetic model more closely than other models.
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Adsorption is one of the method that is in use for remediation of contaminated water. The experimental factors affecting the batch mode of adsorption of various metals and inorganic anions are discussed in this book. The elemental... more
Adsorption is one of the method that is in use for remediation of contaminated water. The experimental factors affecting the batch mode of adsorption of various metals and inorganic anions are discussed in this book. The elemental contaminants have been categorized into four major categories i.e. major toxic elements; essential elements having toxicity on excessive exposure; miscellaneous elements having undetermined effects; non-toxic elements having trivial or unidentified significance. In addition, anions like nitrate, perchlorate and sulphate as water contaminants are considered. This unique volume fills a niche in the area of water treatment. Key Features: Provides practitioners with the background they need to understand and apply batch adsorption processes to the purification of water Describes the actions of adsorption capacity or percentage removal with respect to factors affecting the adsorption process Excellent source of information for those working in the industry for remediation of metals and anions Discusses the current era of Anthropocene which is highly dependent on the anthropogenic mineral sources for its sustenance