Adsorptive removal of copper and nickel ions from water using chitosan coated PVC beads

Department of Chemistry, Biopolymers and Thermophysical Laboratory, Sri Venkateswara University, Tirupati, Andra Pradesh, India.
Bioresource Technology (Impact Factor: 5.04). 08/2008; 100(1):194-9. DOI: 10.1016/j.biortech.2008.05.041
Source: PubMed

ABSTRACT A new biosorbent was developed by coating chitosan, a naturally and abundantly available biopolymer, on to polyvinyl chloride (PVC) beads. The biosorbent was characterized by FTIR spectra, porosity and surface area analyses. Equilibrium and column flow adsorption characteristics of copper(II) and nickel(II) ions on the biosorbent were studied. The effect of pH, agitation time, concentration of adsorbate and amount of adsorbent on the extent of adsorption was investigated. The experimental data were fitted to Langmuir and Freundlich adsorption isotherms. The data were analyzed on the basis of Lagergren pseudo first order, pseudo-second order and Weber-Morris intraparticle diffusion models. The maximum monolayer adsorption capacity of chitosan coated PVC sorbent as obtained from Langmuir adsorption isotherm was found to be 87.9 mg g(-1) for Cu(II) and 120.5 mg g(-1) for Ni(II) ions, respectively. In addition, breakthrough curves were obtained from column flow experiments. The experimental results demonstrated that chitosan coated PVC beads could be used for the removal of Cu(II) and Ni(II) ions from aqueous medium through adsorption.

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    ABSTRACT: Copper complexes of chitosan (Cu-CTS) having different copper concentrations were prepared by the electrochemical oxidation technique in aqueous-acetic acid medium (a novel method of preparation) without side reactions. The percentage composition of the complexes was found to depend on the time of electrolysis. All the formed complexes were soluble in the preparation medium indicating that they are charged; probably having positive charges. The properties of these complexes have been demonstrated by partial elemental analysis, spectra (Far-IR; FTIR; UV/Visible spectroscopy, XRD, ESR), swelling studies and thermogravimetric analysis (TGA, DTGA). The IR spectra showed that chitosan behaves in two modes: monodentate and bidentate to form complexes with pendant and bridging models. Their formation (1N, 2N, 3N) seems to be simultaneously occurring where the pendant has the priority while the bridging form is more stable and well separated by replacing the copper anode by platinum to form corresponding complexes(1R, 2R, 3R). The pendant form may be probably formed by ion exchange mechanism, while the bridging by chelation. The electronic spectra showed a maximum wavelength at ~ 750 nm (υ ~ 13300 cm-1) in accordance with octahedral structure which supported by ESR spectra. The amorphous structure of chitosan changed on copper complexes as shown from the XRD patterns. The biological evaluation of the prepared complexes on EAC (Erlich Ascites Carcinoma) and Vero cell lines showed that pure chitosan (CTS) and their complexes (1N), (1R), (2R) exhibited an inhibitory effect which reached ~ 82%. On the other hand, the prepared samples (2N), (3N) and (3R) showed inhibitory activity 67-70%. The DNA binding affinity assay justified the possible cytotoxic mechanism by showing that (1N) exhibited the highest binding to DNA than that of pure chitosan and the other complexes.
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    ABSTRACT: Chitosan is a good absorber for removing cationic and anionic dyes as well as the removal of heavy metals ions. Chitosan and bio polymers is used for water purification and sterilization in recently years, for removal some materials that are harmful for human body even at low concentrations. Chitin is one of the most materials in the earth extract from crustacean shell such as prawns, crabs, shrimp, fungi and other crustaceans chitosan has a certain reputation for many reason like :absorption properties, no toxicity, ability to decomposition, stabilize of enzymes. The use of chitosan have a high speed and is an economically and efficiently. chitosans are for separation of materials such as copper, zinc ,chrome ,iron nickel ,cadmium ,mercury that is debated mechanism to coordinate the metal ions with an amino group. Each of the ions separate in special conditions that related to elements like: ion adsorption on the surface ,chemical absorption ,PH, rate mix ,temperature ,concentration. KEYWORDS : Chitosan , adsorption heavy ion, separation , effect of PH in separation
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    ABSTRACT: The studies on the modification of chitosan and the properties of its derivatives using physical fields (ultrasonic field) for raising the reaction speed and reaction yield have been carried out. The basic investigative data were provided for the development on the highly efficient, new water treatment agent. O-(hydroxyl isopropy1) chitosan-Fe(II) was synthesized via 1,2-epoxypropane derived reaction of Fe2+ with chitosan. The structure of the product was identified by its transform Fourier infrared spectrum, UV spectrum, and X-ray diffraction. The adsorptive properties of hydroxypropyl chitosan-Fe(II) complex (HPCTS-Fe2+) for heavy metal ions were researched. The experiments showed that the removal efficiencies were 99.8% and 78.8%, respectively, using 1% (g/mL) of the HPCTS-Fe2+, pH5, initial concentration 1 mg/L Cu2+, 0.1 mg/L Pb2+, respectively, equilibration for 30 min. It showed that HPCTS-Fe2+ might be used as a new highly efficient water treatment agent for adsorbing heavy metal ions.
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