03759nam a2200409 4500 20260817161600.0 th eng .b11686753 AIT Thesis no. EV-97-05 Nyein Nyein Aung Adsorption/desorption of heavy metals using chitosan Bangkok : Asian Institute of Technology, 1997 78 leaves Thesis ; no. EV-97-05 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 1997 Batch experiments for heavy metal removal by adsorption using chitosan and desorption of adsorbed metal from chitosan were conducted. Adsorption and desorption isothermal results indicated that multilayer adsorption of heavy metal on chitosan took place. Both adsorption and desorption for copper and chromium are favorable whereas those of lead are also acceptable. 66%,45%and 47% desorption was observed for copper, chromium and lead. Kinetic studies verified that desorption occured within 24 hour. Effects of influencing parameters such as pH, particle size, temperature, agitation speed were investigated. The optimum pH values for adsorption on chitosan were 5.5,6 and 4, likewise, the optimum pH values for desorption were 2.41, 2.5 and 2.5 for Cu Cr and Pb respectively. The amount of Cu sorbed on 710 æm chitosan particles and 425 æm chitosan particles were 2 mg/g and 7 mW/g for the equilibrium concentration of 1 mg/L. The amount of Cu sorbed at 37.5 ° C and 50 C were 6.5 mg/g and 11 mg/g respectively for the equilibrium concentration of 0.5 mg/L. The amount of Cu sorbed at the agitation speed of 50 rpm and 250 rpm were 16 mg/g and 17 mg/g for the equilibrium concentration of 5 mg/L. In the case of desorption, when the initial Cu sorbed was 2.5 mg/g, Cu desorbed from 710 æm chitosan particles and 425 æm chitosan particles were 1.05 mg/g and 1.19 mg/g respectively. When the initial amount sorbed was 5 mg/g, Cu desorbed at 37.5 ° C and 50 °c were 3.5 mg/g and 4.5 mg/g. When the initial Cu sorbed was 17 mg/g, the amount of Cu desorbed at the agitation speed of 50 rpm and 250 rpm were 1.9 mg/g and 10 mg/g respectively. Similar trend was observed for Cr and Pb. Lower particle size, higher temperature and higher agitation speed enhanced both adsorption and desorption. Sewage Purification Heavy metals removal Annachhatre, Ajit P., Chairperson Suwalee Chandrkrachang, Examination Committee Ishibashi, Y., Examination Committee Asian Institute of Technology Partial, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-97-05 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B14317 .b11686753 mnait y 240403 0 971208 m a y 0 mnait mnait mnarc 20 40 Barcode : 30050120600738 CREATED : 1996-11-07 RECORD # : i12036006 LPATRON : 1019654 LCHKIN : 2007-05-25 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 3 TOT RENEW : 0 Barcode : 30050120600720 CREATED : 1996-11-07 RECORD # : i12036018 LPATRON : 1019762 LCHKIN : 2007-11-10 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 26 TOT RENEW : 8 Barcode : 30050160078555 CREATED : 2016-05-23 RECORD # : i1298629x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 1819 1819 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. EV-97-05 30050120600738 2026-08-17 16:16:00 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 0 AIT Thesis no. EV-97-05 30050120600720 2026-08-17 16:16:00 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. EV-97-05 30050160078555 2026-08-17 16:16:00 2026-08-17 40