Batch Cr(VI) removal by polyacrylamide-grafted sawdust: Kinetics and thermodynamics

Comparison of the Thermodynamic Parameters Estimation for the Adsorption Process of the Metals from Liquid Phase on Activated Carbons

“…The majority of studies on the sorption kinetics have revealed a two-step behaviour of the adsorption systems (Brigatti et al, 2000;Csobán et al, 1998;Raji et al, 1998) with fast initial uptake and much slower gradual uptake afterwards, which might take days even months Csobán et al, 1998;Raji et al, 1998;Kumar et al, 2000;Ajmal et al, 2001;Lakatos et al, 2002;Chakir et al, 2002;Leist et al, 2000;Csobán & Joó, 1999). Some of the authors reported the optimum contact time of minutes (Kumar et al, 2000;Ajmal et al, 2001), whereas, at the other extreme, that of hundred hours (Brigatti et al, 2000;Lakatos et al, 2002) for equilibrium to be attained; and the average values reported for the heavy metal binding were of 1-5 hours (Csobán et al, 1998;Raji et al, 1998;Chakir et al, 2002;Leist et al, 2000;Csobán and Joó, 1999). It has been also stressed that adsorption thermodynamics is drastically affected by the equilibrium pH of the solutions.…”

Pengurangan Cemaran Logam Berat Pada Perairan Dan Produk Perikanan Dengan Metode Adsorbsi

“…Selulosa yang berasal dari serbuk gergaji, batang pisang, dan bubuk selulosa dimodifikasi menggunakan teknik inisiasi kimia. Gaey et al (2000) menggunakan gugus karboksil dari asam akrilik sebagai gugus pengkelasi pada pembuatan adsorben dari serbuk gergaji, sementara Raji & Anirudhan (1998) menggunakan gugus amino dari akrilamida untuk bahan yang sama. Guclu et al (2003) menggunakan gugus karboksil dari akrilik untuk membuat adsorben dari bubuk selulosa komersial.…”

Adsorption of Cr(VI) ions onto Pongamia pinnata leaves carbon from aqueous solutions –A Kinetic study

“…Cr(VI) found to be present in mining and metal plating, steel production, photographic materials, corrosive paints and cement industries [1]. Cr(VI) has been reported to be toxic to humans, animals and also is known to be carcinogenic [2]. The utmost permissible limit of Chromium (VI) for the discharge into inland surface water is 0.1 mg/L [ 3].…”