Removal of ni(II) from aqueous solutions by sorption

A Comparison of Chemisorption Kinetic Models Applied to Pollutant Removal on Various Sorbents

“…However, it is typically expressed in a range of reaction only 5,28 . The data of Bhargava and Sheldarkar 21 for the sorption of phosphate onto unrinsed tamarind nut shell activated carbon (TNSAC) and rinsed tamarind nut shell activated carbon were plotted according to equation (2) and the results are shown in Figure 1.…”

“…An early application of the pseudo-® rst order rate equation of Lagergren was the sorption of cellulose triacetate from chloroform onto calcium silicate by Trivedi et al 2 . Numerous studies report ® rst order Lagergren kinetics for the sorption of metals such as the sorption of As(III) from aqueous solutions by haematite 3 , the sorption of nickel(II) from aqueous solutions by Woolastonite and china clay 4,5 , the sorption of chromium(VI) by bismuth trioxide 6 , the sorption of cadmium(II) onto hydrous ceric oxide 7 , the sorption of chromium(III) by natural moss and chromium(VI) by copper-coated moss 8 , the sorption of mercury(II) onto hydrous zirconium oxide 9 , the sorption of lead(II) onto kaolinitic clay 10 , the sorption of arsenite(III) and arsenate(V) using basic yttrium carbonate 11 and the sorption of arsenic(V) on haematite and feldspar 12 ; of dyes such as the sorption of Omega Chrome Red ME (OCRME) using a 1:1 ratio of¯y ash and coal 13 , the sorption of Methylene Blue on water hyacinth roots 14 , the sorption of Orlamar Red BG (ORBG) by Fomitopsis carnea 15 , the sorption of Congo Red, Procin Orange and Rhodamine-B by waste orange peel 16 , the sorption of Congo Red on red mud 17 and the sorption of Acid Blue 29 and Reactive Blue 3 on chrome sludge 18 . Others studies utilizing the pseudo-® rst order model include the sorption of Acid Violet dye onto waste banana pith 19 and the sorption of¯uoride, phosphate and arsenate(V) using lanthanum-impregnated silica gel 20 .…”

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

“…Phenomenological models where the various parameters of the system are lumped into empirical constants are another approach to analyzing the adsorption data. The first-order model [4] is the classical example and has been employed in numerous systems [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The rate equation and its solution in terms of fractional adsorbate concentration in solution are in the form The other widely used model is the second-order kinetic model [24][25][26][27], (2) dχ(t) dt = −K 2 χ(t) 2 and χ(t) = 1 1 + K 2 t .…”

Kinetic, isotherm and thermodynamics investigation on adsorption of divalent copper using agro-waste biomaterials, Musa acuminata, Casuarina equisetifolia L. and Sorghum bicolor

“…8). This observation can be explained based on (i) increased escaping tendency of already adsorbed molecules from adsorbent into the bulk solution due to increase in total energy of sorbate molecules at higher temperature 45 and (ii) dissolution of sorbing solution because adsorbent functional groups are soluble at high temperatures 46 . Though, this seems to be corroborates with the well-known fact that sorption capacity is expected to decrease with an increase in solution temperature when sorption process is exothermic, the present case involves both physical and chemical adsorptions and such simultaneous occurrence of both adsorptions was reported earlier by Ho et al McKay 47 and Panday et al…”