A review on the utilization of fly ash

Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: A review

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Langmuir, Freundlich, Temkin and Dubinin–Radushkevich Isotherms Studies of Equilibrium Sorption of Zn 2+ Unto Phosphoric Acid Modified Rice Husk

In the study of adsorption, changes in free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) have been most frequently calculated from the Langmuir equilibrium constant. In a strict theoretical sense, the Langmuir equilibrium constant with units of liters per mole and the thermodynamic equilibrium constant without units are not the same. Moreover, the equilibrium constants for thermodynamic calculation have also been derived in different ways in the literature, for example, Frumkin isotherm, Flory−Huggins isotherm, distribution constants, and so on. As a result, values of ΔG°, ΔH°, and ΔS° of adsorption reported in the literature are very confusing. This study shows that for a dilute solution of charged adsorbates or for a solution of uncharged adsorbates at any concentration, the thermodynamic equilibrium constant of adsorption would be reasonably approximated by the Langmuir equilibrium constant, and thus the use of the Langmuir equilibrium constant for calculation of ΔG° and subsequent determination of ...

Is the Free Energy Change of Adsorption Correctly Calculated

http://www.css.cornell.edu/faculty/lehmann/pictures/publ/BioresTechnol%20102,%208877-8884,%202011%20Chen.pdf

Adsorption of copper and zinc by biochars produced from pyrolysis of hardwood and corn straw in aqueous solution.

Adsorption, kinetics and equilibrium studies on removal of Cr(VI) from aqueous solutions using different low-cost adsorbents

Adsorption of Zn(II) from aqueous solution by using different adsorbents

Heavy Metals Accumulation in Water, Sediment and Tissues of Different Edible Fishes in Upper Stretch of Gangetic West Bengal

Experimental investigations have been carried out to evaluate the two-phase pressure drop and the holdup for flow through helical coils. The coils were made of thick wall transparent PVC tube of diameter 0.01 m and 0.013 m. 24 coils were made at different coil diameter and different helix angles (0° to 12°). Three different liquids were used for the experimental studies and air was the gas. Empirical correlations have been developed to predict the two-phase friction factor and the liquid holdup as functions of the physical and dynamic variables of the system. Statistical analyses of the correlations suggest that they are of acceptable accuracy.

/pdf/gas-liquid-flow-through-coils-3ipuaccmqn.pdf

Gas-liquid flow through coils

Experimental investigations have been carried out to evaluate the two-phase pressure drop and the hold-up for gas−liquid flow through vertical helical coils. The coils were made of thick-walled transparent PVC tubes of diameters 0.01 and 0.013 m. Twenty-four coils were made with different coil diameters and different helix angles (0−12°). Three different liquids and air were used for the experimental studies. Empirical correlations were developed to predict the two-phase friction factor and the liquid hold-up as functions of the physical and dynamic variables of the system. Statistical analysis of the correlations suggests that they are of acceptable accuracy.

S.N. Mandal .

Papers

Adsorption, kinetics and equilibrium studies on removal of Cr(VI) from aqueous solutions using different low-cost adsorbents

Adsorption of Zn(II) from aqueous solution by using different adsorbents

Heavy Metals Accumulation in Water, Sediment and Tissues of Different Edible Fishes in Upper Stretch of Gangetic West Bengal

Gas-liquid flow through coils

Gas−Liquid Flow through Helical Coils in Vertical Orientation