Biosorption of Chromium, Copper, and Nickel Ions byTamarindus IndicaFruit Nut Testa

Abstract

Biosorption of chromium, copper, and nickel from aqueous solution by Tamarindus indica fruit nut testa (TFNT) in its pristine and acid-treated forms was studied under equilibrium and column-flow conditions. TFNT, a tannin-containing material, was characterized by energy dispersion x-ray fluorescence (EDXRF) and Fourier transform infrared (FTIR) spectral techniques and surface analysis. The effect of experimental variable parameters such as pH, concentration of metal ions, amount of adsorbent, and contact time on adsorption was investigated. Batch isothermal equilibrium data were analyzed on the basis of Langmuir and Freundlich adsorption isotherms. The kinetics of the adsorption process were studied in terms of Lagergren first-order kinetic model. The monolayer adsorption capacities of pristine and acid-treated forms of tamarind seed coat were found to be 44.8 and 77.5 mg/g for Cr(VI), 55.8 and 99.0 mg/g for Ni(II), and 84.7 and 85.4 mg/g for Cu(II) ions, respectively. The column-flow adsorption data were used to obtain breakthrough curves. The biosorbent loaded with the metal ions was regenerated using 1.0 M HCl and the regenerated bed was used for subsequent adsorption-desorption cycle.

Biosorbents for hexavalent chromium elimination from industrial and municipal effluents

“…(10) differs from a true first-order equation in two ways: (i) the parameter k 1 (q e − q t ) does not represent the number of available sites, and (ii) the parameter log q e is an adjustable parameter and often it is found not equal to the intercept of the plot of log(q e − q t ) vs. t, whereas in a true first-order log q e should be equal to the intercept [132]. The above model is best fit for hexavalent chromium removal by Azadirachta indica [133], Nostoc muscorum [134], Tamarindus indica [95], tea fungal biomass [78], tea factory waste [135], rice husk [110] and wollastonite [93].…”

Copper biosorption by pine cone shell and thermal decomposition study of the exhausted biosorbent

“…The Freundlich model has the form [45]; (10) where K F is the equilibrium constant indicative of adsorption capacity (mg/g) and 1/n is an empirical parameter related to the adsorption intensity.…”

“…Agroindustrial biomass has been known to readily adsorb metal ions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The ability of metal uptake by these biomasses (known as biosorption) has caught great attention due to its potential to provide an effective and economic means for the remediation of heavy-metal-polluted wastewater.…”

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

“…Hence, the maximum chromium removal was observed at lower pH i.e., 2. Higher removal of chromium at low pH may also be due to the reduction of chromium (VI) to chromium (III) [18,19], which was then adsorbed by the adsorbent.…”