Abstract
In order to obtain membranes with both organic separation and adsorption functions, knitted tube composite β-cyclodextrin/chitosan (β-CD/CS) porous membranes were prepared by the non-solvent induced phase separation (NIPS) method using CS and β-CD as a membrane-forming matrix, glutaraldehyde as crosslinking agent to improve water stability, and knitted tube as reinforcement to enhance the mechanical properties. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), contact angle, water flux, bovine serum albumin (BSA) rejection and tensile test were carried out. The FTIR demonstrated that the β-CD and CS had been successfully crosslinked. With the crosslinking time increased, the membrane structure became denser, the contact angle and the rejection rate increased, while the water flux decreased. The strength and elongation at a break were 236 and 1.7 times higher than these of bare β-CD/CS porous membranes, respectively. The strength of crosslinking membranes increased further. The adsorption performance of composite membranes was investigated for the removal of phenolphthalein (PP) from aqueous solution. The adsorption process followed the Langmuir isotherm model, and the kinetic behavior was accorded with the Double constant equation and the Elovich equation. The adsorption mechanism could be explained by the synergistic effect of host-guest interaction from β-cyclodextrin, non-uniform diffusion and porous network capture.
Highlights
The problem of water pollution has become increasingly prominent due to the rapid development of the modern industry
Chitosan (CS) is the N-deacetylated product of chitin, and the –OH and –NH2 containing in the molecule can form a chelate with metal ions (Figure 1a) [3], which is widely used in metal ions adsorption [4,5,6], organic adsorption [7,8] and other water treatment fields
The results showed that the interaction between the adsorbent and deoxyribonucleic acid (DNA) was achieved by inclusion formation, hydrophobic interaction, hydrogen bonding, and van der Waals forces
Summary
The problem of water pollution has become increasingly prominent due to the rapid development of the modern industry. Rodrigo et al [12] prepared CS membranes by glutaraldehyde crosslinked to adsorb Hg2+ , and the maximum amount of adsorption was 75.7 mg/g at pH 6. Junthip et al [19] crosslinked β‐CD with citric acid to adsorb paraquat from water, and found that its adsorption isotherm. Using maleic chain citric acid to adsorb paraquat from water, and found isotherm conformed to the It a bridge and glutaraldehyde as crosslinking agent, that. Zhao et al [22] prepared a tri-functional adsorbent of CS-ethylene diamine tetraacetic acid (EDTA)-β-CD, founding that the highest adsorption capacity of toxic metal Pb2+ and Cd2+ were. Adwalai et al [23] modified β-CD with amino and hydroxyl groups in CS to prepare a nanocomposite membranes composed of functionalized β-CD and polyethersulfone (PES) for treating low pressure wastewater. 2019, 11, x FOR PEER and isotherm towards theREVIEW adsorption of phenolphthalein (PP) and the adsorption mechanism was investigated
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