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L-CYSTEINE FUNCTIONALIZED MAGNETIC NANOADSORBENT FOR PB2+ AND CR6+ REMOVAL FROM WATER
L-CYSTEINE FUNCTIONALIZED MAGNETIC NANOADSORBENT FOR PB2+ AND CR6+ REMOVAL FROM WATER
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机译：L-半胱氨酸功能化磁性纳米吸附剂，用于去除水中的PB2 +和CR6 +
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摘要
The present invention relates to synthesis of L-Cysteine functionalized magnetite nanoparticles L-Cyst-Fe3O4 NPs , its characterization and successful application for aqueous Pb2+ and Cr6+ removal. L-Cyst-Fe3O4 NPs were synthesized by chemical co- precipitation using Fe2+ and Fe3+ as iron precursors, sodium hydroxide as a base and L-Cysteine as functionalized agent. The structural and morphological studies were carried out using XRD, TEM, DLS, SEM/EDX, FTIR, and UV-Vis spectrophotometer. The zeta potential of bare Fe3O4 and functionalized L-Cyst-Fe3O4 NPs were +38 mV and -30 mV, respectively. The change of surface charge from positive to negative implies the presence of L-Cyst monolayer at particle interface. Maximum Cr6+ and Pb2+ removal occurred at pH 2.0 and 6.0, respectively. Langmuir adsorption capacities of 18.8 mg/g (Pb2+) and 34.5 mg/g (Cr6+) were obtained using L-Cyst-Fe3O4 NPs.
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