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Crystalline Hydrous Ferric Oxide: An Adsorbent for Chromium(VI)‐Contaminated Industrial Wastewater Treatment
Author(s) -
Goswami Saswati,
Bhat Subhas Chandra,
Ghosh Uday Chand
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143005x73604
Subject(s) - chromium , adsorption , chemistry , langmuir adsorption model , industrial wastewater treatment , effluent , wastewater , ferric , langmuir , nuclear chemistry , sodium hydroxide , hydroxide , inorganic chemistry , environmental engineering , organic chemistry , environmental science
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°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°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).