Adsorption studies of Cu(II) on Boston fern (Nephrolepis exaltata Schott cv. Bostoniensis) leaves

Abstract

Adsorption studies were done on Boston fern leaves for the effective removal of Cu(II) ions from aqueous solution. It has been tested for the first time for heavy metal adsorption from aqueous solution. This promising material has shown remarkable adsorption capacity towards Cu(II) ions which confirm its novelty, ease of availability, non-toxic nature, cheapness, etc., and give the main innovation to the present study. The adsorbent was analyzed by FT-IR, SEM and EDS. The effect of pH, contact time, initial metal ion concentration and temperature on the adsorption was investigated using batch process to optimize conditions for maximum adsorption. The adsorption of Cu(II) was maximum (96 %) at pH 4. The experimental data were analyzed by Langmuir, Freundlich and Tempkin isotherms. The kinetic studies of Cu(II)were carried out at room temperature (30°C) in the concentration range 10-100 mg L -1 . The data obtained fitted well with the Langmuir isotherm and pseudo-secondorder kinetics model. The maximum adsorption capacity (q m ) obtained from Langmuir adsorption isotherm was found to be 27.027 mg g -1 at 30°C. The process was found to be exothermic and spontaneous in nature. The breakthrough and exhaustive capacities were found to be 12.5 and 37.5 mg g -1 , respectively. Desorption studies showed that 93.3 % Cu(II) could be desorbed with 0.1 M HCl by continuous mode.

Adsorption characteristics of chemically modified Caryota urens seeds for the removal of Cu(II) from aqueous solution: Isotherms and kinetic studies

“…4). Maximum adsorption capacity of ATCUS towards Cu(II) investigated in the present study was found to be greater than various other adsorbents reported earlier (Table 3) (Rao and Ikram, 2011;Arshadi et al, 2014;Rao and Khan, 2016;Rao and Khan, 2009;Rao and Kashifuddin, 2012). The contact time required to reach equilibrium was found to be dependent on initial Cu(II) concentration.…”

Inhibition and adsorption potentials of mild steel corrosion using methanol extract of Gongronema latifoliuim

“…The obtained results showed that the adsorption followed the physical adsorption mechanism. Negative values of ΔQ ads showed that the reaction was exothermic (Rao and Khan 2017;Ribas et al 2020).…”

Enhancing adsorption capacity of a kaolinite mineral through acid activation and manual blending with a 2:1 clay

“…The ΔS values were also negative for Ni 2+ (-192.12 J mol -1 ) and Pb 2+ (-21.30 J mol) suggesting that there was lowering of randomness at the solidliquid interface which could be a consequence of fixation of the metal ions on the surface of the adsorbent. Conversely, a positive value obtained for Cd 2+ indicates increase in randomness at the interface and good affinity between the metal ion and the adsorbent surface Dawodu, 2016, Rao andKhan, 2017).…”