Biosorption of cadmium (II) onto loquat leaves (Eriobotrya japonica) and their ash from aqueous solution, equilibrium, kinetics, and thermodynamic studies

Abstract

Simple methods for immobilizing titania into pumice were applied, where the products had been used for the application of photodegrading phenol waste. There were two simple methods, which were used separately: solvent evaporation and dip coating. Based on titania sol stability test, it was observed that acid condition would be favourable for immobilizing titania unto pumice, and preferable dispersion medium for solvent evaporation method was ethanol, while dip coating method was better to use aquadest (water). Prepared samples were characterized by FE-SEM, EDX, XRD, and BET analysis. Mechanical strength and photodegradation tests were conducted to observe the quality and ability of immobilized photocatalyst. Experimental results show that both methods had produced mechanically strong immobilized titania, where dip coating method tended to produce homogen solid film of titania on the outer surface of pumice, while solvent evaporation method could deliver titania deeper unto the inner part of the pumice. Catalyst detachment level of immobilized titania nanotube by dip coating method was 4.6%, while the one of the products of solvent evaporation method was 5.0%. Furthermore, in terms of photocatalytic activity, product of dip coating method gave slightly better performance (with 28% of phenol elimination after 240 min) than the product of solvent evaporation method (24%), due to shading effect, mostly occurring to immobilized catalyst in the inner part of the pumice.

Kinetics And Thermodynamic Studies Of Biosorption Of Cadmium (Ii) From Aqueous Solution Onto Sweet Potato Skin (Sps)

“…The higher uptake at higher temperature may be attributed to the availability of more active sites on the surface of SPS, the same result was obtained by Al-Dujaili et al [25] on the Biosorption of cadmium (II) onto loquat leaves(Eriobotrya japonica) and their ash from aqueous solution, equilibrium, kinetics, and thermodynamic studies..…”

“…o is the free energy of adsorption (kJ/mol), T is the temperature in Kelvin and R is the universal gas constant (8. Table 4.Positive value of ΔS o and ΔH o showed increased randomness and that the adsorption process is endothermic [18].A negative value of the free energy (ΔG•) at all the temperature indicates the process to be feasible and spontaneous; the same result was gotten by [18] and also [25]. For physical adsorption free energy change (ΔG o ) ranges from (−20 to 0) kJ/ mol and for chemical adsorption it ranges between (−80 and −400) kJ mol−1 [18].…”

Environmentally Friendly Biosorbent from Moringa Oleifera Leaves for Water Treatment

“…, where: C o and C e are the initial and residual concentration of Cd (II) in water (mg/L), respectively [10], [19].…”

“…Recently, researchers are paying attention on the removal of Cd (II) from aqueous solution using adsorbents derived from low-cost tree leaves such as loquat leaves (Eriobotrya japonica) [10], Psidium guajava leaves [11], Maize leaves [12], Ulmus leaves [13], Scolymus hispanicus [14], Ulmus carpinifolia and Fraxinus excelsior tree leaves [15], fig leaves [16], Azadirachta indica (Neem leaves) [17], Olea europaea (Olive leaves) [18], and Prunus vium leaves [19].…”

Removal of dexamethasone from aqueous solutions using modified clinoptilolite zeolite (equilibrium and kinetic)

“…For instance, a number of studies have been investigated, such as removal of chromium (VI) using sunflower waste (Jain et al 2009a), adsorption of metal ions by olive waste (Fiol et al 2006), removal of copper by pine cone shell (Blazquez et al 2012), Cu(II) onto coconut shell (Acheampong et al 2013), cadmium (II) onto loquat leaves and canola residuals (Al-Dujaili et al 2012;Amouei et al 2014), thorium by brown algae (Keshtkar and Hassani 2014), removal of Cu(II) and Pb(II) by coffee grains (Cerino Cordova et al 2013).…”