title: Removal of copper ions by modified Unye clay, Turkey.
abstract: This paper presents the adsorption of Cu(II) from aqueous solution on modified Unye bentonite. Adsorption of Cu(II) by manganase oxide modified bentonite (MMB) sample was investigated as a function of the initial Cu(II) concentration, solution pH, ionic strength, temperature and inorganic ligands (Cl(-), SO(4)(2-), HPO(4)(2-)). Changes in the surfaces and structure were characterized using X-ray diffraction (XRD), infrared (IR) spectroscopy, N(2) gas adsorption and potentiometric titration data. The adsorption properties of raw bentonite (RB) were further improved by modification with manganese oxide. Langmuir monolayer adsorption capacity of the MMB (105.38 mg/g) was found greater than that of the raw bentonite (42.41 mg/g). The spontaneity of the adsorption process is established by decrease in DeltaG which varied from -4.68 to -5.10 kJ mol(-1) in temperature range 303-313 K. The high performance exhibited by MMB was attributed to increased surface area and higher negative surface charge after modification.
authors: Ahi Evran University, Faculty of Arts and Sciences, Department of Chemistry, 40100 Kirsehir, Turkey. erdalern@omu.edu.tr
authors: Erdal
authors: E
authors: Eren
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D000077215:Clay; D003300:Copper / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D017895:Manganese Compounds / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D011199:Potentiometry; D011522:Protons; D012972:Sodium Hydroxide; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D008024:Ligands; D017895:Manganese Compounds; D010087:Oxides; D011522:Protons; D001546:Bentonite; D012972:Sodium Hydroxide; C027424:manganese oxide; D003300:Copper; D000077215:Clay