Heavy metal–Soluble starch xanthate interactions in aqueous environments

✍ Scribed by Sanjeev Chaudhari; Vinod Tare

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 195 KB
• Volume: 71
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990222)71:8<1325::aid-app12>3.0.co;2-f

✦ Synopsis

The effectiveness of the water-soluble starch xanthate (SSX) process for removal of heavy metals [Hg(II), Cu(II), Cd(II) and Ni(II)] has been evaluated. Removal of Hg(II) and Cu(II) is effective; Cd(II) and Ni(II), less so. The metal [Hg(II)/Cu(II)] binding capacity remains the same in the pH range 3-7. An optimum metal/SSX ratio is observed for maximum metal removal. The metal removal efficiency of SSX appears to be dependent on a specific chemical interaction between metal and SSX and on separation of the metal-xanthate complex from the aqueous phase. An analogy between the metal-SSX system and the colloid-cationic polyelectrolyte system (coagulation and flocculation in water treatment) is observed. The role of ionic strength for metal-SSX system appears to be analogous to the role of indifferent electrolyte in coagulation and flocculation.