Cross linked Sago Starch Phosphate as a Bioadsorbent for the Heavy Metal Pb(II)

• Published in: IOP conference series. Earth and environmental science Vol. 187; no. 1; pp. 12006 - 12013
• Main Authors: Irawadi, TT, Sugiarti, S, Restu, NA
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 19.11.2018
• Subjects: Absorption spectra; Adsorption; bioadsorbent; cross linked sago starch phosphate; Crosslinking; Digestive enzymes; heavy metal Pb(II); Heavy metals; Infrared spectroscopy; Langmuir waves; Lead; pH effects; Reaction time; Sago; sago starch; Sodium hydrogen phosphate; Sodium phosphate; Starch; Synthesis
• ISSN: 1755-1307; 1755-1315; 1755-1315
• DOI: 10.1088/1755-1315/187/1/012006

A cross linked sago starch phosphate (SgP) was successfully synthesized from sago starch (Sg) and a mixture of Na2HPO4-NaH2PO4 in an acidic solution. The synthesized SgP was then used as a bioadsorbent of Pb(II) in an in vitro simulation of the human digestion system. The optimized synthesis condition was reached at an acidic pH 6, at a temperature of 30° C, with a reaction time of 10 minutes, and a mixing rate of 100 rpm. Analysis of Sg and SgP using XRD did not show major differences. An absorption band with a wave number of 2345 cm-1 was observed on the IR spectra of SgP and is a characteristic of a phosphate diester bonding (RO-PO3-R'), indicating a successful cross-linking process. It was found that the adsorption of Pb(II) by SgP follows the second order kinetics and Langmuir equation with adsorption capacity of 23.67 mg/g. It was also found that SgP is resistant to digestive enzymes and changes in pH and temperature, making it suitable for use as a bioadsorbent of Pb(II) under varied conditions.