title: Removal of phenol and chlorophenols from water with reusable dye-affinity hollow fibers.
abstract: Reactive Green HE 4BD carrying polyamide hollow fibers were investigated as dye-affinity adsorbents for removal of chlorophenols (i.e., phenol, o-chlorophenol, p-chlorophenol and 2,4,6-trichlorophenol). Adsorption rates of chlorophenols were very high. Equilibrium was achieved in about 30 min. The applicability of two kinetic models including pseudo-first order and pseudo-second order model was estimated on the basis of comparative analysis of the corresponding rate parameters, equilibrium capacity and correlation coefficients. Results suggest that chemisorption process could be the rate-limiting step in the adsorption process. The maximum adsorption values of chlorophenols onto the Reactive Green HE 4BD carrying hollow fibers were 145.9 micromol/g for phenol, 179.2 micromol/g for 2,4,6-trichlorophenol, 194.5 micromol/g for p-chlorophenol and 202.8 micromol/g for o-chlorophenol. The affinity order was as follows: o-chlorophenol>p-chlorophenol>2,4,6-trichlorophenol>phenol. The adsorption capacity of chlorophenols decreased with increasing pH. Desorption of chlorophenols was achieved using methanol solution (30%, v/v). The Reactive Green HE 4BD-carrying hollow fibers are suitable for repeated use for more than 10 cycles without noticeable loss of adsorption capacity.
authors.affiliation: Department of Chemistry, Hacettepe University, Ankara, Turkey.
authors.forename: Serap
authors.initials: S
authors.lastname: Senel
authors.forename: Ali
authors.initials: A
authors.lastname: Kara
authors.forename: Güleren
authors.initials: G
authors.lastname: Alsancak
authors.forename: Adil
authors.initials: A
authors.lastname: Denizli
mesh_terms: D000327:Adsorption; D002733:Chlorophenols / Q000302:isolation & purification*; D004396:Coloring Agents / Q000737:chemistry*; D007700:Kinetics; D009757:Nylons; D019800:Phenol / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D002733:Chlorophenols; D004396:Coloring Agents; D009757:Nylons; D014874:Water Pollutants, Chemical; D019800:Phenol