Biosorption of Cd(II) and Zn(II) by Nostoc commune: Isotherm and Kinetics Studies

Abstract

In this study, Nostoc commune (cyanobacterium) was used as an inexpensive and efficient biosorbent for Cd(II) and Zn(II) removal from aqueous solutions. The effect of various physicochemical factors on Cd(II) and Zn(II) biosorption such as pH 2.0-7.0, initial metal concentration 0.0-300 mg/L and contact time 0-120 min were studied. Optimum pH for removal of Cd(II) and Zn(II) was 6.0, while the contact time was 30 min at room temperature. The nature of biosorbent and metal ion interaction was evaluated by infrared (IR) technique. IR analysis of bacterial biomass revealed the presence of amino, carboxyl, hydroxyl, and carbonyl groups, which are responsible for biosorption of Cd(II) and Zn (II). The maximum biosorption capacities for Cd(II) and Zn(II) biosorption by N. commune calculated from Langmuir biosorption isotherm were 126.32 and 115.41 mg/ g, respectively. The biosorption isotherm for two biosorbents fitted well with Freundlich isotherm than Langmuir model with correlation coefficient (r 2 < 0.99).The biosorption kinetic data were fitted well with the pseudo-second-order kinetic model. Thus, this study indicated that the N. commune is an efficient biosorbent for the removal of Cd(II) and Zn(II) from aqueous solutions.

Recovery and Recycling of Zn(II) from Wastewater by Scenedesmus sp. MCC 26 Isolated from a Heavy Metal Contaminated Site

“…These results show that saturation of the microalgal surface is dependent on initial zinc ion concentrations. At low concentrations of zinc ions, active sites of biomass surface attract the available zinc ions more quickly but at higher concentrations, zinc ions diffuse slowly into the biomass surface by intra particular diffusion .…”

Removal of methylene blue dye using Nostoc commune biomass: kinetic, equilibrium and thermodynamic study

“…There are studies on the use of Nostoc biomass for the removal of some heavy metals such as Pb, Zn, Cd, and Cr (Diengdoh & Syiem, 2017;Gupta & Rastogi, 2008;Morsy et al, 2011), but there is little information of its use in the treatment of synthetic colorantsIs important and advantageous to carry out biosorption studies with Nostoc commune (NC) since it grows in extreme conditions and low in nutrients, it does not produce toxic substances compared to other bacteria and fungi, besides, it is capable of photosynthesis (Patel et al, 2019). These characteristics mean that the Nostoc commune could be grown outdoors or in laboratory cultures on a large scale and at low cost, therefore, providing a cheap, reliable, and constant supply of biomass for eventual expansion works, in this way to be used sustainably.…”

Effects of cadmium-induced stress on essential oil production, morphology and physiology of lemon balm (Melissa officinalis L., Lamiaceae)

“…Heavy metals like Pb, Cu, Cr, Zn, Ni and Cd negatively affect plant development (Adrees et Kunwar et al, 2015). Cd is not essential to plant growth and development (Morsy et al, 2011) and its primary source is anthropogenic (Alloway and Steinnes, 1999). This accelerates the accumulation of this metal in the soil.…”