摘要：AbstractIn the present study, biosynthesized silica-based zinc oxide nanocomposites (nano-SZO) have been explored as nanoadsorbent for sequestrating heavy metal ions viz. Ni2+, Cd2+and Cu2+from synthetic medium. The nanocomposites have been obtained by utilization of agricultural waste by means of green synthetic approach with an average particle size of 30.52 nm and a pH at zero-point charge as 4.8. The process has been optimized at a pH equal to 5.0 for Ni2+and 6.0 for Cu2+and Cd2+. Adsorption was best described by Langmuir isotherm and the highest value of maximum adsorption capacity,qmof nano-SZO was obtained for Cu2+(32.53 mg/g), Ni2+(32.10 mg/g), and Cd2+(30.98 mg/g). The studied heavy metal ions are considerably adsorbed by the nano-SZO through chemisorption by active binding with polyhydroxy functionalities attached at the surface of the nanoadsorbent confirming the utilization of biosynthesized nano-SZO as eco-friendly and efficient nano adsorbents for the sequestration of heavy metal ions.
关键词：KeywordsenHeavy metal ionsWater treatmentAdsorptionNanocompositesChemisorption
