Batch-wise adsorption, saxs and microscopic studies of zeolite pelletized with biopolymeric alginate

Abstract

-Removal of nitrates, sulfate and Zn(II) ions from aqueous solutions through adsorption onto biopolymeric alginate/clinoptilolite-rich tuff pellets was studied by using an equilibrium batch technique. The idea of this approach of biosorbent fabrication is to promote the native zeolite adsorption performance and thus to prepare more efficient amphoteric tailor-made products for specific environmental targets. A flexible component, i.e., alginate biopolymer, and a rigid component (pulverized) zeolite were crosslinked using Fe(III) and Ca(II) chlorides, additively. The extent of adsorption was found to be considerably higher than with the other mostly natural adsorbents examined towards similar pollutants. The equilibrium adsorption data for the above pollutants were satisfactorily fitted to Freundlich and Langmuir isotherms, respectively. According to the linscale SAXS pattern, there was a strong background visible, which may indicate the presence of a considerable amount of biopolymeric phase in the composite samples analysed. Scanning Tunneling, Electron and Atomic Force Microscopies helped visualize their surface texture and morphology.

Natural Zeolites as Sustainable and Environmental Inorganic Resources over the History to Present

“…While Fe(III) cationic sites of pelletized biosorbent remove the negative oxyanionic pollutants in water during the cleanup process by electrostatic forces, Ca cations of biosorbent matrix are responsible for ion exchange and thus toxic cations removal (Figure 7). [29] Figure 7 Principal sketch of the synthesized Fe(III) alginate pelletized clinoptilolite-rich tuff and its function for inorganic anions uptake.…”

Removal of Lead Ions from Aqueous Solutions by a Novel <em>Ficus carica L.</em>-Zeolite-Alginate Biocomposite

“…In current study, biocomposite was prepared from natural materials such as zeolite, alginate Natural zeolites have been known by their high ion-exchange capacity, relatively high specific surface areas and, more importantly, their relatively low prices [6].Rich zeolite deposits, especially of clinoptilolite, are located in Turkey [7]; therefore, it is rational to benefit from this abundant material.…”

Removal of Lead Ions from Aqueous Solutions by a Novel Ficus carica L.-Zeolite-Alginate Biocomposite

“…Moreover, Turkey is a leader country in fig production in the world; hence, to evaluate the agricultural waste like fig leaves is noteworthy [5]. Natural zeolites have been known by their high ion-exchange capacity, relatively high specific surface areas and, more importantly, their relatively low prices [6].Rich zeolite deposits, especially of clinoptilolite, are located in Turkey [7]; therefore, it is rational to benefit from this abundant material. The adsorptive properties of alginate based on the presence of carboxylic acid and hydroxyl functional groups that have a high affinity towards heavy metals.…”