Dyes Removal from Aqueous Solution Using Wood Activated Charcoal of Bombax Cieba Tree

Abstract

Thermodynamic and kinetics of adsorption of basic dyes (methylene blue and basic blue 3) on wood charcoal activated at 800 °C, prepared from Bombax Cieba (M78D) was investigated. Equilibrium data was obtained using batch method at temperatures of 10 °C to 50 °C. It was found that adsorption increase with increase in temperature. The Langmuir isotherm model describe the equilibrium of adsorption. Thermodynamic parameters such as ΔS°, ΔH° and ΔG° were calculated. From the values of ΔH° and ΔG°, it was concluded that the adsorption process is endothermic and spontaneous in nature. To determine kinetics parameter Lagergren equation was applied, and it was found that the reaction proceed through first order kinetic mechanism.

Sorption Studies of Nickel ions Onto Sawdust of Dalbergia Sissoo

“…The first-order rate expression of Lagergren 34 can be expressed as, (2) where q e and q t are the amount (g g -1 ) of nickel ions adsorbed at equilibrium and at time t respectively and k is the overall rate constant. Straight lines were obtained by plotting log (q e -q t ) against t, as shown in Fig.…”

“…Biosorption is a process that utilizes biological materials as adsorbents, and several researchers have studied this method as an alternative technique to conventional methods for heavy metal removal from wastewater. [1][2][3][4][5][6][7] The binding mechanisms of heavy metals by biosorption could be explained by the physical and chemical interactions between cell wall ligands and adsorbates by ion exchange, complexation, coordination and microprecipitation. The diffusion of the metal from bulk solution to active sites of biosorbents occurs predominantly by passive transport mechanisms, 8 and various functional groups such as carboxyl, hydroxyl, amino and phosphate existing on the cell wall of biosorbents can bind the heavy metals.…”

Synthesis of a MnO2/multiwalled carbon nanotube nanocomposite and its application as a sorbent for removing Cu2+ ions from aqueous media

“…Determining K (T) at various temperatures and applying the Van't Hoff equation, one can determine ΔH° ad and ΔS° ad from the slope and intercept of the Van't Hoff linear plot: where ΔH° ad and ΔS ° ad are assumed to be temperature independent.…”

Kinetics of Acid Blue 1 Adsorption from Aqueous Solution by Carbonaceous Substrate Produced from Biotic Precursor

“…The bulk density of the samples was also measured. [20][21][22] Surface area was measured by the BET-N 2 adsorption experiments carried out manometrically at -196 ℃ using the Quantachrome instrument (Nova 2200). The surface area was obtained by applying the standard BET equation to the adsorption data in the relative pressure range (p/p 0 ) 0.05 to 0.350.…”