title: Preparation and characterization of chitosan-clay nanocomposites for the removal of Cu(II) from aqueous solution.
abstract: In the present study, chitosan assembled on gold and silver nanoparticles were prepared and characterized by UV-vis, TEM, EDX and DLS techniques. The nanocomposites chitosan (Ch)/clay, chitosan (Ch)/AgNPs/clay and chitosan (Ch)/AuNPs/clay were prepared by solution mixing method and characterized by FTIR, XRD, and SEM techniques. The adsorption of copper(II) ions onto the prepared hybrid composites from an aqueous solution using batch adsorption was examined. The results showed that benefiting from the surface property of clay, the abundant amino and hydroxyl functional groups of chitosan, the adsorbent provides adequate and versatile adsorption for the Cu(II) ions under investigation. The batch adsorption experiments showed that the adsorption of the Cu(II) is considerably dependent on pH of milieu, the amount of adsorbent, and contact time. Batch adsorption studies revealed that the adsorption capacity of Cu(II) increased with increase in initial concentration and contact time with optimum pH in the range around neutral. The maximum uptake of Cu(II) ions by (Ch)/AgNPs/clay composite was found to be 181.5mg/g. The adsorption efficiency of Cu(II) ions by prepared (Ch)/AgNPs/clay and (Ch)/AuNPs/clay is bigger than that the individual chitosan (Ch)/clay composite which clarifies the role of metal nanoparticles in enhancement the adsorption characters. The study suggests that the (Ch)/AgNPs/clay hybrid composite is a promising nano-adsorbent for the removal of Cu(II) ions from aqueous solution.
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.
authors.forename: Eid M S
authors.initials: EM
authors.lastname: Azzam
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.
authors.forename: Gh
authors.initials: G
authors.lastname: Eshaq
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.
authors.forename: A M
authors.initials: AM
authors.lastname: Rabie
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.
authors.forename: A A
authors.initials: AA
authors.lastname: Bakr
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt.
authors.forename: Ali A
authors.initials: AA
authors.lastname: Abd-Elaal
authors.affiliation: Department of Petrochemicals, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt.
authors.forename: A E
authors.initials: AE
authors.lastname: El Metwally
authors.affiliation: Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727, Cairo, Egypt. Electronic address: salahtwfk85@yahoo.com.
authors.forename: Salah M
authors.initials: SM
authors.lastname: Tawfik
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D000077215:Clay; D003300:Copper / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D012996:Solutions / Q000737:chemistry*; D013499:Surface Properties; D018508:Water Purification
chemical_list: D000538:Aluminum Silicates; D012996:Solutions; D012834:Silver; D006046:Gold; D003300:Copper; D048271:Chitosan; D000077215:Clay
keywords: Adsorption; Chitosan; Clay; Cu(II) ions; Nano adsorbent