Cr(VI) REMOVAL FROM AQUEOUS SOLUTION ONTO AGRICULTURAL WASTE (MODIFIED SUN FLOWER HEAD WASTE): BATCH STUDIES

Authors : Y. F. DEMİRAL, Neşe ÖZTÜRK

Pages : 53-62

View : 13 | Download : 8

Publication Date : 2017-11-23

Article Type : Research Paper

Abstract :800x600 Normal 0 21 false false false TR X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:`Table Normal`; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:``; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:`Times New Roman`,serif;} In this study, removal of chromiuminsert ignore into journalissuearticles values(VI); from aqueous solution by adsorption onto agricultural waste insert ignore into journalissuearticles values(modified sunflower head waste); was investigated. Batch studies were conducted and effect of initial solution pH, initial concentration, adsorbent dosage, temperature, and contact time on the removal of Crinsert ignore into journalissuearticles values(VI); was investigated. Crinsert ignore into journalissuearticles values(VI); was determined by UV spectrophotometry. The maximum removal was obtained at the initial pH of 1 for initial concentration 150 mg/L, at 25 o C and 240 rpm. Adsorption yield increased with the increasing adsorbent dosage and temperature. Langmuir and Freundlich isotherm models were applied to data. P seudo first order and pseudo second order kinetic models were applied to fit kinetic data. Thermodynamics parameters were also determined. The positive values of ΔH° change indicated that adsorption is endothermic. N egative values of ∆G° showed adsorption process is spontaneous. The positive ΔS° values indicated that the randomness increase . Adsorbent capacity was obtained as 7.35 mg/g.
Keywords : Cr VI, , sunflower head waste, adsorption, batch study