Biosorption of nickel with barley straw

Abstract

Nickel contaminated wastewater from plating industries is a major environmental concern. Current treatment methods are often expensive and can also create additional problems. Biosorption is an alternative treatment method that uses inexpensive biomaterials to sequester metals from aqueous solutions. In this study, acid washed barley straw (AWBS) was used for adsorbing nickel ions (Ni 2+ ) from simulated nickel plating wastewater. The adsorption process was rapid and the equilibrium was reached in about anhour. An increase in the initial nickel concentration increased the equilibrium nickel uptake, and the maximum uptake was found to be 8.45 mg/g of AWBS when the initial nickel concentration was1000 mg/L at pH 5. Nickel adsorption was favorable at room temperature than 5 o C and 40 o C, better adsorption rate and equilibrium uptake was observed at 23 o C. Increasing the pH from 3 to 7 increased the equilibrium nickel uptake and the maximum uptake was observed at pH 7, whilst the initial nickel ion concentration was 100 mg/L. The Freundlich isotherm model exhibited better fit with the equilibrium data than the Langmuir equation. Nickel was desorbed using hydrochloric acid solution at pH 2 and the desorption efficiency was 86%. LIST OF TABLES

Mono/competitive adsorption of Arsenic(III) and Nickel(II) using modified green tea waste

“…Moreover, the small value of n meant Ni(II) could be easily adsorbed by the MGTW. A comparison of the As(III) and Ni(II) with maximum adsorption capacities by the MGTW with other adsorbents [30][31][32][33][34][35][36] was made as presented in Table 3.…”

Nickel(II) biosorption from aqueous solutions by shrimp head biomass

“…Optimal pH values for Ni(II) biosorption have been reported within the 3.0-8.0 interval for several biosorbents such as sugarcane bagasse (Alomá et al 2012), barley straw (Thevannan et al 2010), gum kondagogu (Cochlospermum gossypium) (Vinod et al 2010), Litchi chinensis seeds (Flores-Garnica et al 2013), Gracilaria caudata, Sargassum muticum (González-Bermúdez et al 2011), Mucor hiemalis (Shroff and Vaidya 2011a), Lactarius salmonicolor (Akar et al 2013), and Rhodotorula glutinis (SuazoMadrid et al 2011). The optimal solution pH value for Ni(II) biosorption onto APSH was 7.0 and this pH was therefore used in further studies.…”

“…This result is in agreement with the shape of the experimental Ni(II) biosorption isotherm, which exhibits Langmuirian behavior. The fact that the Langmuir model is capable of describing the equilibrium biosorption of Ni(II) by APSH has practical importance in terms of engineering design and scaleup (Thevannan et al 2010). The applicability of the Langmuir isotherm model to the Ni(II)-APSH system suggests that Ni(II) binds as a monolayer on the APSH surface.…”

Enhancement of the Stability of Biosorbents for Metal-Ion Adsorption

“…Sodium sulfate was selected as the background electrolyte because sodium is the alkaline light metal that has very low affinity for organic compounds and sulfate is the anion in the nickel solution. 25 Then it is 50% possible to study the effect of the IS by decreasing the disturbance resulting from the background cations and anions. The results of IS effects on the nickel uptake are shown in Figure 4.…”