SYNTHESES CHITOSAN CROSSLINK AND GRAFTING AS ADSORBENT TOXIC METALS WASTE

Masykur, Abu and Siswanta, Dwi (2010) SYNTHESES CHITOSAN CROSSLINK AND GRAFTING AS ADSORBENT TOXIC METALS WASTE. HBL DIPA BLU APBN UNS. pp. 1-4.

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    Abstract

    Two kinds of chitosan crosslink with Ethylene Glycol Diglicydil Ether (EDGE) and Bisphenol A Diglicydil Ether (BDE) as crosslinker via a hydroxil group at C6 of chitosan was syntheses. These syntheses conducted by three stage i.e, (1) Protection amine groups of chitosan by reaction chitosan with benzaldehide (CBen), (2) Crosslinked CBen with EDGE or BDE, and (3) Deprotection Benzil groups from cross-link chitosan by reacted with HCl. Croslink chitosan produce yellow powder that can’t soluble in strong acids e.g. HCl, HNO3, and acetic acid. Carboxymethylation of chitosan crosslink done by reaction with chloroacetic acid. FTIR spectra have been used as a tool to identification every stages of reaction. Spectrum infrared of CBen shows some major change due to reaction. The new peak at wavenumber 763,8 cm-1 dan 702,3 cm-1 from bending vibration of benzil group indicated that protection successfully. Crosslink processes used EGDE as croslinker make change infrared spectra. The peak at wave number 1.100 cm- increasing indicate that COC group increase. Crosslink processes used BDE as crosslinker give new peaks at 895,0 cm-1 and 1519,9 cm-1 from vibration benzene with para substitute. Appear peak at 1400 cm-1 and 2900 cm-1 show that increasing ethylen and methylene groups. Deprotection benzaldehyde groups from chitosan crosslink to be successful showed disappeared peak at 763,8 cm-1 dan 702,3 cm-1. Grafting chloroacetic acid on chitosan crosslink succesfuly made based on new peaks at 1600 cm-1 from carboxylic acid, and increasing peak intensity at 1427,3 cm-1 from ethylene groups. Comparison of XRD powder diffractograms of chitosan and crosslink chitosan observe that crosslink chitosan show that peak at 2=20 deg and 2=10 deg decrease. This phenomena indicating that cross-link chitosan become more amorf. Crosslink chitosan make decrease surface area. Surface area of chitosan, CE and CB used BET method are 94,076 m2/g, 0,671 m2/g, dan 2,013 m2/g respectively and BJH method are 69,614 m2/g, 0,491 m2/g dan 1,301 m2/g Application crosslink chitosan as adsorbent heavy metals i.e (Cu2+, Cd2+, and Pb2+) give optimum pH at more than 5. Adsorbtion capacity of chitosan for ions Cu2+, Cd2+, and Pb2+ are 56,7, 37,4 and 84,6 mg/g; CE are 56,7, 37,4 and 84,6 mg/g; and CB are 56,7, 37,4 and 84,6 mg/g; respectively. Crosslink chitosan with EGDE and graft by chloroacetic acid increasing capacity adsorption of Pb2+ almost twice more than chitosan. Keywords: Carboxymethil chitosan, Crosslink, EDGE, BDE, adsorption, heavy metals.

    Item Type: Article
    Subjects: Q Science > QD Chemistry
    Divisions: Lembaga Penelitian dan Pengabdian Kepada Masyarakat - LPPM
    Depositing User: Lia Primadani
    Date Deposited: 18 Apr 2014 21:34
    Last Modified: 18 Apr 2014 21:34
    URI: https://eprints.uns.ac.id/id/eprint/12043

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