adsorption of p-nitrophenol by three different activated carbons (f100, s.e.i. and b.d.h.) was carried out at 301 k and at controlled ph conditions. two different adsorption models (langmuir model and freundlich model) were studied and compared. the adsorption capacity of the carbons depends on the point of zero charge (pzc) and surface area of the carbons. adsorption of the solute at higher ph...

N a previous communication (CALVO, FREUNDLICH and UMBARGER 1969), a I group of Salmonella typhimurium mutants was described as having the following properties. They were resistant to an analog of leucine, 5’,5’,5’-trifluoroDL-leucine (RENNERT and ANKER 1963), excreted leucine, had constitutive and derepressed levels of enzymes involved in leucine biosynthesis, and they had mutant sites linked t...

The present work investigates the equilibrium adsorption of Chrysene on multi-walled carbon nanotubes at 293, 303 and 313°K, and determines the equilibrium adsorption isotherms and thermodynamic parameters (ΔG, ΔH and ΔS). The values of ΔH and ΔG suggested that the adsorption of Chrysene onto MWCNTs was endothermic and nonspontaneous.The experimental data were analyzed using Langmuir, Freundlic...

The studies on removal of Lead (II) were conducted using Coconut shell. Adsorption efficiency has been evaluated. The effect of pH, contact time, adsorbent dose, concentration of metal, particle size and temperature were studied. The result reveals that Langmuir and Freundlich isotherms are followed during adsorption process. Thermodynamics parameter indicates the feasibility of the process. Ki...

Wastewaters obtained from fenvalerate manufacturing process were treated for its safe disposal using activated coconut shell carbon (acc) as adsorbent. In this work, the removal efficiency of organic matter in terms of chemical oxygen demand (COD) utilizing acc has been investigated. Various parameters which can influence the adsorption like adsorbent dosage, contact time of solution with adsor...

In this study, a series of macroporous polyacrylamide-based monoliths bearing negatively charged interaction sites were synthesized as adsorbents for effective removal Th4+ from aqueous solutions. The effects solution pH, contact time, monolith dosage, initial concentration, and temperature on adsorption process was studied. Langmuir, Freundlich, Dubinin–Raduskevich isotherms applied to describ...

This study was designed to investigate the removal of reactive violet 48 from wastewater using Commercial activated carbon and Coir pith activated carbon. Its adsorption capacity has been tested for the decolourization of waste water containing reactive violet 48. The effect of system variables such as concentration, temperature, contact time and pH were studied. The adsorption data follow Lang...

6 Briggs, D. R., J. Phys. Chem., 32, 641 (1928). 7 Washburn, E. W., J. Am. Chem. Soc., 38, 2431 (1916). 8 Zwaardemakef, H., Chem. Abs., 10, 2837 (1916). 9 Harkins, W. D., and Humphrey, E. C., J. Am. Chem. Soc., 38, 242 (1916.). 10 Kruyt, H. R., Koll. Z., 22, 81 (1918). 11 Kruyt, H. R., and van der Willigen, P. C., Koll. Z., 45, 307 (1928). 12 Freundlich. H., and Rona, P., Sitz. preuss. Akad. Wi...