Optimization of oxide coating process on quartz sand for arsenic (III) removal from groundwater

Abstract

Research Article| March 01 2011 Optimization of oxide coating process on quartz sand for arsenic (III) removal from groundwater Rakesh Chandra Vaishya; Rakesh Chandra Vaishya 1Department of Civil Engineering, Motilal Nehru National Institute of Technology, Allahabad-211004, India Tel.: 91-0532-2271315 Fax: 91-0532-22545341; E-mail: rcvaishya@yahoo.com Search for other works by this author on: This Site PubMed Google Scholar Sudhir Kumar Gupta Sudhir Kumar Gupta 2Centre for Environmental Science and Engineering, Indian Institute of Technology, Mumbai-400076, India Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2011) 60 (2): 109–120. https://doi.org/10.2166/aqua.2011.099 Article history Received: June 06 2007 Accepted: July 19 2010 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Rakesh Chandra Vaishya, Sudhir Kumar Gupta; Optimization of oxide coating process on quartz sand for arsenic (III) removal from groundwater. Journal of Water Supply: Research and Technology-Aqua 1 March 2011; 60 (2): 109–120. doi: https://doi.org/10.2166/aqua.2011.099 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex This paper presents optimization of various oxide coating processes on quartz sand surface. The chemical characteristics of quartz sand collected from the Yamuna river, Allahabad, India, shows 82.022% SiO2 besides other oxides. The optimal coating temperature was 60°C; optimal pHcoating≈0.5; optimal heating time was 60 hours and percentage iron salt [Fe(NO3)3·9H2O] was 8–10% w/w for iron oxide coated sand (IOCS) with maximum As(III) removal efficiency. The 60 h heating time in iron oxide coating process yields maximum Fe (mg/g) on the sand surface. The pHcoating has shown considerable effect on arsenic removal efficiency during optimization of sulfate modified iron oxide coated sand (SMIOCS) media. The SMIOCS prepared at pHcoating<1.0 was quite efficient compared to media prepared at pHcoating≅neutral and pHcoating≅12.05. The mixed oxide coated sand (MOCS) prepared at pHcoating<1.0 has shown better arsenic removal efficiency in comparison to other mixed oxide coated sand media. The BET surface area varied between 2.55 and 7.895 m2/g for particle size ranging from 0.324 mm to 0.716 mm for different coated sand media. The pHzpc values indicate that the IOCS and SMIOCS media are positively charged at neutral pH, whereas uncoated sand is negatively charged. Equilibrium and column studies results show that IIS and MIOCS media have better As(III) removal potential compared with other media. column studies, iron oxide coated sand (IOCS), mixed oxide coated sand (MOCS), optimization, pHzpc, sulfate modified iron oxide coated sand (SMIOCS) This content is only available as a PDF. © IWA Publishing 2011 You do not currently have access to this content.