title: A spectroscopic study for understanding the speciation of Cr on palm shell based adsorbents and their application for the remediation of chrome plating effluents.
abstract: Palm shell based adsorbents prepared under five different thermochemical conditions have been shown to be quite effective for removal of chromium (III and VI) from aqueous solutions. X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FT-IR) have been used to determine information about the speciation and binding of chromium on the adsorbents under study. X-ray photoelectron spectroscopy (XPS) studies indicate that oxidation of lignin moieties takes place concurrently to Cr(VI) reduction and leads to the formation of hydroxyl and carboxyl functions. The maximum adsorption capacity for hexavalent chromium was found to be about 313 mg/g in an acidic medium using PAPSP. This is comparable to other natural substrates and ordinary adsorbents. The efficacy of the adsorbents under study to remove chromium from plating waste water has been demonstrated.
authors.affiliation: Department of Chemistry, The MS University of Baroda, Vadodara 390002, India.
authors.forename: Shilpi
authors.initials: S
authors.lastname: Kushwaha
authors.forename: B
authors.initials: B
authors.lastname: Sreedhar
authors.forename: Padmaja P
authors.initials: PP
authors.lastname: Sudhakar
mesh_terms: D000327:Adsorption; D029064:Araceae / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002857:Chromium / Q000302:isolation & purification*; D004595:Electroplating; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D056951:Photoelectron Spectroscopy / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D002857:Chromium