Abstract
Hazardous waste from mercury is a critical problem that requires serious attention. Herein, we report bio-colloidal silver nanoparticles (AgNPs) synthesized via green synthesis route from AgNO3 aqueous solution and Sandoricum koetjape (SK) peel extract and demonstrate their sensitivity at detecting mercury ions (Hg2+) using colorimetry. AgNPs were synthesized by varying the volume ratio of AgNO3 solution to SK peel extract, namely AgNPs(4:1), AgNPs(3:2), AgNPs(1:1), AgNPs(2:3), and AgNPs(1:4). Bio-colloidal AgNPs were tested for their ability to detect toxic heavy metal mercury ion by adding different concentrations of Hg2+. All samples have successfully detected Hg2+ at varying levels of sensitivity. This investigation revealed that AgNPs(4:1) is the most sensitive colloid for detecting Hg2+ up to a concentration of 1 ppm.
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