Affiner votre recherche
Résultats 1-3 de 3
Adsorption-desorption behaviour of zinc(II) at iron(II) hydroxide-aqueous solution interface as influenced by pH and temperature
1990
Anjana Srivastava | Srivastava, P.C. (Department of Soil Science, G. B. Pant University of Agriculture and Technology, Pantnagar-263145 (India))
Removal of Cu++ ions from aqueous solution by bisorbent based on Lagenaria vulgaris shell | Uklanjanje Cu++ jona iz vodenih rastvora biosorbentom na bazi kore Lagenaria vulgaris
2009
Bojic, A., Univerzitet u Nisu, Nis (Serbia). Prirodno-matematicki fakultet, Odsek za hemiju | Mitic-Stojanovic, D.L., JP Vodovod, Vranje (Serbia) | Bojic, d., Univerzitet u Nisu, Nis (Serbia). Prirodno-matematicki fakultet, Odsek za hemiju | Andjelkovic, T., Univerzitet u Nisu, Nis (Serbia). Prirodno-matematicki fakultet, Odsek za hemiju
This study investigates the effect of pH, temperature, contact time and initial metal concentration on Cu++ ions removal from water solutions, using biomass of Lagenaria vulgaris skin (LV). With higher pH, the efficiency of copper sorption increases and reaches its maximum at pH 7.0. Temperature has negative effect on sorption process due to its exothermic properties. Biosorption efficiency increases with time and reaches equilibium after 40 min. Increasing initial copper concentration gives an increase in biosorbent sorption capacity, and a proportional decrease in treatment efficiency. Obtained results have shown that LV based biosorbent is an efficient and available mean for toxic metal removal from natural and waste waters.
Afficher plus [+] Moins [-]Cationic and anionic clays as potential adsorbents for Cr(VI) | Katjonske i anjonske gline kao moguci adsorbenti za Cr(VI)
2009
Marjanovic, V., Visoka poslovna-tehnicka skola, Uzice (Serbia) | Petrovic, R., Univerzitet u Beogradu, Beograd (Serbia). Tehnolosko-metalurski fakultet | Aksentijevic, S., Visoka poslovno-tehnicka skola, Uzice (Serbia)
Anionic clays (layered double hydroxides) comprise positively charged layers with at least two different metal cations, octahedrally coordinated by hydroxyl groups. The positive charges of layered double hydroxides are counterbalanced by interlayer anions. The interlayer anions and water, which fill the interlayer space, are often labile. Therefore, anionic clays exhibit anion exchange capacity (AEC). Anionic clays which have a high surface area and a high anion exchange capacity, are potential adsorbents for anionic contanimants, such as the oxyanion of chrome. The adsorption study of chromium (VI) from aqueous solutions by natural cationic clay mineral (kaolinite, montmorillonite, etc.) was not given much attention, perhaps due to the fact cationic clays have negatively charged layers and clay mineral surface shows no affinity for oxyanion of chrome.
Afficher plus [+] Moins [-]