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标题：Biosynthesized silica-based zinc oxide nanocomposites for the sequestration of heavy metal ions from aqueous solutions
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作者：Rishav Garg ; Rajni Garg ; Nnabuk Okon Eddy 等
期刊名称：Journal of King Saud University - Science
印刷版ISSN：1018-3647
出版年度：2022
卷号：34
期号：4
页码：1-8
DOI：10.1016/j.jksus.2022.101996
语种：English
出版社：Elsevier
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