resumo
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.
palavras-chave
REMOVAL; DYES; ARSENATE; SORPTION; CARBON; WATER
categoria
Engineering
autores
Chmielewska, E; Sabova, L; Peterlik, H; Wu, A
Grupos
agradecimentos
This project was funded by the Slovak Scientific Council VEGA (Project # 1/0193/09) and Slovak-Chinese Cooperation grant SK-CN-0002-09, for which the authors express thank. A great thanks is also given to Biont Company in Bratislava for their 2 STM micrographs.