Crystalline hydrous titanium (IV) oxide (CHTO): An arsenic (III) scavenger from natural water

Research Article| November 01 2004 Crystalline hydrous titanium (IV) oxide (CHTO): An arsenic (III) scavenger from natural water Biswaranjan Manna; Biswaranjan Manna 1Department of Chemistry, Presidency College, 86/1 College Street, Kolkata-700073 West Bengal, India Search for other works by this author on: This Site PubMed Google Scholar Monotosh Dasgupta; Monotosh Dasgupta 1Department of Chemistry, Presidency College, 86/1 College Street, Kolkata-700073 West Bengal, India Search for other works by this author on: This Site PubMed Google Scholar Uday Chand Ghosh Uday Chand Ghosh 1Department of Chemistry, Presidency College, 86/1 College Street, Kolkata-700073 West Bengal, India Tel.: 91-033-2241-3893; E-mail: ucg@vsnl.net Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2004) 53 (7): 483–495. https://doi.org/10.2166/aqua.2004.0038 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Twitter LinkedIn Tools Icon Tools Cite Icon Cite Permissions Search Site Search nav search search input Search input auto suggest search filter All ContentAll JournalsThis Journal Search Advanced Search Citation Biswaranjan Manna, Monotosh Dasgupta, Uday Chand Ghosh; Crystalline hydrous titanium (IV) oxide (CHTO): An arsenic (III) scavenger from natural water. Journal of Water Supply: Research and Technology-Aqua 1 November 2004; 53 (7): 483–495. doi: https://doi.org/10.2166/aqua.2004.0038 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Arsenic contamination (>10 ppb) in groundwater poses a risk to public health globally. The problem is apparently the greatest in the Bengal basin of the Ganga River. As(III) is a major contaminant in anoxic groundwater. Here, a systematic report on As(III) removal using synthetic crystalline hydrous titanium(IV) oxide (CHTO) is made. Absolute As(III) sorption capacity is 72 to 75 g kg−1 at a pH of 7.0. CHTO has nearly the same sorption density in the pH range of 6.0 to 9.0. Use of pre-dried CHTO above 350°C shows a decrease in sorption density from 11.50 (±0.10) to <9.0 mg g−1. Approximately 70% of As(III) sorption takes place within 0.5 hour. Interfering effect studies of some ions show a poor effect on the sorption process except for HCO−3. As(III) sorption follows the Lagergren first-order kinetic model and the sorption data fit the Freundlich and Langmuir isotherms well. Batch and column methods for regeneration of arsenic rich CHTO with 1.0 M NaOH solution show ∼90% and 75 to 80% regain of its initial efficiency, respectively. Flow-rate and bed depth variation effects on As(III) removal from a spiked (500 µg l−1) natural water are reported systematically. Lab-bench mini-pilot scale application of a fixed-bed (bed volume=30.0 cm3) CHTO column is reported at a down flow-rate of 33 to 34 B.V. (bed volume) h−1 using an As(III) spiked (320 µg l−1) natural tap water sample from Presidency College, Kolkata. Reuse of the bed after regeneration shows a decrease in As(III) removal efficiency to the extent of 20–25% of that of a fresh column. Arsenic recovery (∼99.25%) from the regenerate is also reported. arsenic(III), crystalline titanium(IV) oxide, natural water, recovery, removal, sorption This content is only available as a PDF.