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Abstract
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Nanotechnology is the application of scientific knowledge to manipulate and control matter at
the nanoscale in order to make use of size- and structure-dependent properties and
phenomena, as distinct from those associated with individual atoms or molecules or with bulk
materials [1]. Carbon dots (CDs), as a new class of functional carbon nanomaterials, have
been attracting tremendous attention due to their unique optical properties coupled with low
toxicityand facile functionalization. This has led to numerous possible applicationsinsensing,
bioimaging and the develop ment of optoelectronic devices [2]. Molybdenum is an essential
trace element for both plants and animals, including humans. However, it appears to be toxic
when its concentration in plants is higher than 5 μg.g-1, whereas potential toxicity for
ruminants equals to 10 μg.g-1. Also, due to the good resistance of molybdenum to corrosion as
well as the melting point, high strength and thermal conductivity, this element is widely used
in various industries. Therefore, the high risk of environmental pollution around such
industries makes the measurement of molybdenum in plant and biological samples important
[3]. In the current research, red emissive carbon quantum dots used to determine
molybdenum(VI) in aqueous media. In this way, the analyte was first separated and
concentrated using green extraction methods based on cetyltrimethyl-ammonium bromide
(CTAB) surfactant, and then it was dissolved in ethanol medium and measured. The linear
range and detection limit of the proposed method for measuring molybdenum (VI) were 5-50
μg.L-1 and 2 μg.L-1, respectively.
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