Download or read book Effects of Activated Carbon Surface Chemistry and Pore Structure on the Absorption of Methyl Tertiary Butyl Ether and Trichloroethene from Natural Water written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Activated carbon adsorption is the best available treatment technology for thecontrol of many objectionable trace organic compounds. Activated carbons are frequentlycharacterized by the iodine number and BET surface area, but these parameters do notcorrelate well with trace organic compound removal from natural water. Therefore, theobjective of this research was to develop activated carbon selection criteria that assure theeffective removal of trace organic contaminants from natural water and to base theselection criteria on the adsorbent's pore structure and surface chemistry. Tosystematically evaluate pore structure and surface chemistry effects, a matrix of activatedcarbon fibers (ACFs) with three activation levels and four surface chemistry levels wasstudied. To evaluate whether adsorption trends established for ACFs were also valid forgranular activated carbon (GAC), ACF results were compared with those obtained forthree commercially available GACs. Adsorption capacities were determined for naturalorganic matter (NOM), for relatively hydrophilic methyl tertiary-butyl ether (MTBE) andrelatively hydrophobic trichloroethene (TCE) in organic-free water, and for MTBE andTCE in the presence of NOM. NOM isotherms showed that DOC adsorption occurredprimarily in pores with diameters in the 11 to 500 Å range and that electrostaticinteractions between NOM and the carbon surface played a role in NOM adsorption. According to both single-solute isotherms and micropollutant isotherms in the presence of NOM, hydrophobic adsorbents more effectively removed TCE and MTBE thanhydrophilic adsorbents. Effective adsorbents for drinking water treatment shouldtherefore contain little oxygen and nitrogen whose presence increases the polarity of theadsorbent surface. Based on the elemental composition of the low-ash carbons evaluatedin this study, activated carbons should have oxygen and nitrogen contents that sum to nomore than 2 to 3 mmol/g to assure sufficient hydrophobicity. In a.
Download or read book Effects of Activated Carbon Surface Chemistry and Pore Structure on the Adsorption of Methyl Tertiary butyl Ether and Trichloroethene from Natural Water written by Patricia Ann Quinlivan and published by . This book was released on 2001 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: activated carbon, chemical treatment, surface treatment, adsorption properties, microporosity.
Download or read book Effects of Activated Carbon Surface Chemistry and Pore Structure on the Adsorption of Trace Organic Contaminants from Aqueous Solution written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objectives of this research were (1) to identify activated pore structure and surface chemistry characteristics that assure the effective removal of trace organic contaminants from aqueous solution, and (2) to develop a procedure to predict the adsorption capacity of activated carbons from fundamental adsorbent and adsorbate properties. To systematically evaluate pore structure and surface chemistry effects on the adsorption of organic micropollutants from aqueous solution, a matrix of activated carbon fibers (ACFs) with three activation levels and four surface chemistry levels was prepared and characterized. In addition, three commercially available granular activated carbons (GACs) were studied to verify whether correlations developed for the ACF matrix are valid for adsorbents that are typically used for water treatment. BET surface area, pore size distribution, elemental composition, point of zero charge and infrared spectroscopy data were obtained to characterize the adsorbents. The results showed that the ACF matrix prepared in this study permits a fairly independent evaluation of surface chemistry and pore structure effects on organic contaminant adsorption from aqueous solution. Methyl tertiary-butyl ether (MTBE), a relatively hydrophilic adsorbate, and trichloroethene (TCE), a relatively hydrophobic adsorbate, served as adsorbate probes. To evaluate the effects of natural organic matter (NOM) on MTBE and TCE adsorption capacities, isotherm experiments were conducted in ultrapure water and Sacramento-San Joaquin Delta water. With respect to surface chemistry, both single-solute isotherms and isotherms in the presence of NOM indicated that hydrophobic adsorbents more effectively removed TCE and MTBE from aqueous solution than hydrophilic adsorbents. Enhanced water adsorption on polar surface sites explained the poorer performance of the hydrophilic adsorbents. Based on the elemental composition of the low-ash carbons evaluated in this study, act.
Download or read book Effect of Surface Groups on Adsorption of Pollutants written by Robert W. Coughlin and published by . This book was released on 1970 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Activated Carbon Surface Chemistry and Pore Structure on the Adsorption of Trace Organic Contaminants from Aqueous Solution written by Lei Li and published by . This book was released on 2002 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: trace organic contaminants, pore structure, surface chemistry, adsorbent.
Download or read book Effect of Surface Chemistry and Porsity of Activated Carbons on the Adsorption of Water and Organic Pollutants written by Issa I. Salame and published by . This book was released on 2002 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Activated Carbon Surface Chemistry Modification on the Adsorption of Mercury from Aqueous Solution written by Emily Kaye Faulconer and published by . This book was released on 2012 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mercury (Hg), a naturally occurring element, is toxic and can lead to negative health impacts for humans and ecosystems. Activated carbon adsorption is effective in treating Hg-laden aqueous effluent for safe discharge. Two modifications of commercially available activated carbon were investigated: iron impregnation to allow for magnetic sorbent recapture and wet chemical oxidation to enhance aqueous Hg capture. The modified carbons were characterized by nitrogen adsorption-desorption, XRD, pHpzc, vibrating sample magnetometry, elemental analysis, and total acidity titration. The 3:1 C:Fe magnetic powdered activated carbon (MPAC) retained a high surface area of 790 m2/g and was 95% magnetically recoverable, with the iron present primarily as maghemite. The characteristics of the surface oxygen modified carbons varied based on the nature of the modifying reagent and its concentration. The modified carbons were applied to trace level Hg solutions (100 μg/L). The 3:1 MPAC achieved the highest adsorption capacity, reaching 91% Hg removal with 2% volatilized and 84% adsorbed. Adsorption occurs primarily as chemisorption, thus allowing for non-hazardous residuals disposal until reaching a loading of greater than 800 μg Hg/ g MPAC.
Download or read book The Influence of Activated Carbon Surface Chemistry and Solvent Interactions on the Adsorption of 2 methylisoborneol written by Robert Considine and published by . This book was released on 1997 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Activated Carbon Adsorption written by Roop Chand Bansal and published by CRC Press. This book was released on 2005-05-24 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: High surface area, a microporous structure, and a high degree of surface reactivity make activated carbons versatile adsorbents, particularly effective in the adsorption of organic and inorganic pollutants from aqueous solutions. Activated Carbon Adsorption introduces the parameters and mechanisms involved in the activated carbon adsorption
Download or read book Effect of Pore Size Distribution on Competitive Adsorption of Trace Organic Micropollutants on Activated Carbon in Natural Water written by Costas Pelekani and published by . This book was released on 1997 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Activated Carbon Surface Chemistry on Adsorption of P nitrophenol written by Cuneyt Ali Feizoulof and published by . This book was released on 1995 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Treatment Technologies for Removal of Methyl Tertiary Butyl Ether MTBE from Drinking Water written by MTBE Research Partnership and published by . This book was released on 1998 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanism of Organic Adsorption on Activated Carbon written by John Thomas Cookson and published by . This book was released on 1973 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Surface Groups on Adsorption of Pollutants written by Robert W. Coughlin and published by . This book was released on 1970 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advanced Oxidation Processes for Water and Wastewater Treatment written by Simon Parsons and published by IWA Publishing. This book was released on 2004-03-01 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The suitability of Advanced Oxidation Processes (AOPs) for pollutant degradation was recognised in the early 1970s and much research and development work has been undertaken to commercialise some of these processes. AOPs have shown great potential in treating pollutants at both low and high concentrations and have found applications as diverse as ground water treatment, municipal wastewater sludge destruction and VOCs control. Advanced Oxidation Processes for Water and Wastewater Treatment is an overview of the advanced oxidation processes currently used or proposed for the remediation of water, wastewater, odours and sludge. The book contains two opening chapters which present introductions to advanced oxidation processes and a background to UV photolysis, seven chapters focusing on individual advanced oxidation processes and, finally, three chapters concentrating on selected applications of advanced oxidation processes. Advanced Oxidation Processes for Water and Wastewater Treatment will be invaluable to readers interested in water and wastewater treatment processes, including professionals and suppliers, as well as students and academics studying in this area. Dr Simon Parsons is a Senior Lecturer in Water Sciences at Cranfield University with ten years' experience of industrial and academic research and development.
Download or read book Adsorption Simulations of Trichloroethylene and Methyl Tertiary Butyl Ether in Zeolites written by Melissa Karagözlüoğlu and published by . This book was released on 2010 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Micropore Size and Chemical Nature of the Pore Surface on the Adsorption Properties of Activated Carbon Fibers written by Kenneth Lee Foster and published by . This book was released on 1993 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:
