Crystalline hydrous ferric oxide: an adsorbent for chromium(VI)-contaminated industrial wastewater treatment.
Synthetic crystalline hydrous ferric oxide (CHFO) (particle size 0.14 to 0.29 mm) has been used systematically for adsorptive chromium(VI) removal from contaminated water. Batch experiments were performed as a function of pH, contact time, solute concentration, and regeneration of adsorbents. Column experiments were performed for breakthrough points in the presence and absence of other ions and treatment of industrial effluent. The optimum pH range was 2.0 to 4.0. The adsorption kinetic data could be described well by both second-order and pseudo-first-order models. The isotherm adsorption data at 30 +/- 2 degrees C obeyed the Langmuir model best. The monolayer adsorption capacity was 35.7 mg/g. Chromium(VI)-rich CHFO could be regenerated up to 89 +/- 1% with 2.0 M sodium hydroxide. Regenerated column reuse showed a decrease (10 to 12%) in breakthrough capacity. Finally, the CHFO- (dried at 300 degrees C) packed column was used for the recovery (98.5 +/- 1.0%) of chromium(VI) from contaminated industrial waste effluent of Hindustan Motor Limited (Hooghly, West Bengal, India).
Goswami
Saswati
S
Department of Chemistry, Presidency College, West Bengal, Kolkata, India.
Bhat
Subhas Chandra
SC
Ghosh
Uday Chand
UC
D000327:Adsorption; D002857:Chromium / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D007220:Industrial Waste; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification*; D014877:Water Pollution, Chemical / Q000517:prevention & control
D005290:Ferric Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D002857:Chromium; C000499:ferric oxide