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Unformatted text preview: n. Batch adsorption studies were conducted in a nutrient solution at different initial concentration of 4-chlorophenol and 2,4-dichlorophenol individually and in combination. The single component adsorption was found to be more than 2 00.35 mg/g for 4-chlorophenol and 262.12 mg/g for 2,4-dichlorophenol at pH <7 and pH <5, respectively. The adsorption capacity decreased with increasing pH and this was explained through surface repulsion. The single component adsorption 2 data for both chlorophenols fitted relatively well into Redlich -Peterson isotherm model with R >0.98. 2 The data could also be fitted to both Langmuir and Freundlich isotherm models satisfactorily with R >0.91. For the binary system, the competitive adsorption appears to be dominated by 2,4dichlorophenol. In the presents of 2,4-dichlorophenol, the adsorption of 4-chlorophenol decreases drastically. In contrast, the presents of 4-chlorophenol affected the adsorption of 2,4-dichlorophenol to a lesser extent. However, at pH 9, the adsorption capacity for both compounds in the binary system became comparable due to the increase in surface repulsion between the anionic form of 2,4 dichlorophenol and the surface of the activated carbon. The binary system data were fitted relativel y 2 well R >0.92 to the extended Langmuir model. 99 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia ENV-O25 STUDY OF THE EFFECTIVENESS OF COMPLEXING AGENTS IN THE REMOVAL OF HEAVY METALS IN AQUEOUS SOLUTIONS Alyaa Amalina M. Azli and Abdull Rahim M. Yusoff Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia E-mail: [email protected] The effectiveness of the removal of heavy metals using various complexing agents in aqueous solution was studied. Heavy metals such as chromium (Cr), lead (Pb), nickel (Ni), mercury (Hg) and vanadium (V) formed insoluble complex with 2,4,6-trimercaptotiazine (TMT), sodium dimethyl dithio -carbamate (SDMTC) and sodium diethyl dithio-carbamate (SDETC) thus removing the heavy metals from the aqu...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11