Open AccessAdsorptive removal of copper ions in water using electrospun cellulose acetate / chitosan nanostructured membrane
Author(s) -
Ruth R. Aquino,
R M M Asuncion,
M A D E Cabungcal,
S M V Vicente,
Larry Q. Reyes,
Marvin S. Tolentino
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/344/1/012037
Subject(s) - adsorption , fourier transform infrared spectroscopy , cellulose acetate , electrospinning , chitosan , membrane , chemisorption , copper , scanning electron microscope , materials science , langmuir adsorption model , nuclear chemistry , chemical engineering , contact angle , chemistry , polymer , composite material , organic chemistry , metallurgy , biochemistry , engineering
Nanostructured membranes from cellulose acetate (CA) reinforced with chitosan (CS) were developed using electrospinning process and characterized in order to obtain the best blend for the removal of Cu 2+ ions in wastewater. Different CA/CS ratios of 95:5 (w/w), 90:10 (w/w), and 85:15 (w/w), respectively, were prepared and electrospun on a constant voltage of 30 kV and a tip-to-collector distance of 18 cm, which are the optimum conditions for this blend. Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the membrane in terms of its morphology and molecular structure. Among the three (3) blends prepared, CA with 15% load of chitosan had exhibited better membrane properties and therefore was utilized in the removal of Cu 2+ ions in wastewater. The effect of contact time on the adsorption capacity at constant fiber dosage (0.05 g) in a 50 mL copper nitrate solution containing an initial concentration of 100 ppm Cu(II) was investigated. A strong affinity of Cu +2 ions for pure CA than CA/CS was observed after 4 hours of contact time. However, as equilibrium was established for CA/CS blend, the highest adsorption capacity was recorded. Adsorption kinetics studies were best fitted to pseudo-second-order model describing a chemisorption process that showed a covalent or electrostatic chemical bond between the adsorbent and adsorbate. CA loaded with CS in adsorption of Cu 2+ ions in water showed that it is a novel process that could be widely used in the industry.