A multifunctional composite Fe3O4/MOF/l-cysteine for removal, magnetic solid phase extraction and fluorescence
Lu Fan1, Min Deng1, Caixue Lin1
1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Function Molecules, Hubei University 430062 People's Republic of China lingli@hubu.ed.cn +86-27-88663043 +86-27-88662747.
Abstract:
Fe3O4/MOF (metal organic framework)/l-cysteine was synthesized and applied for the removal of Cd(ii) from wastewater. The adsorption kinetics and isotherms were investigated, and the results indicated that the adsorption obeyed the pseudo-second-order kinetic model and Langmuir isotherm. The maximum adsorption capacity was calculated to be 248.24 mg g-1. Fe3O4/MOF/l-cysteine was further applied to determine trace amounts of Cd(ii) in real water samples using ICP-AES (inductively coupled plasma-atomic emission spectroscopy) based on magnetic solid-phase extraction (MSPE). The determination limit was 10.6 ng mL-1. Additionally, Fe3O4/MOF/l-cysteine can also be used as a fluorescent sensor for "turn-off" detection of Cd(ii), and the detection limit was 0.94 ng mL-1.
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