Method for removing heavy metal ions in water by carbon quantum dots prepared through heterogeneous nucleation hydrothermal method

Abstract

The invention provides a method for removing heavy metal ions in water by carbon quantum dots prepared through a heterogeneous nucleation hydrothermal method. The preparation method of carbon quantumdots comprises the following steps: taking carbon quantum dots with fluorescence emission peaks at 410nm to 480nm as seed crystals, and thiuram as a carbon source, reacting at 200 DEG C in a high-pressure reaction reactor for 0.5 to 5 hours, taking out and naturally cooling to room temperature, and filtering to obtain a slightly yellow carbon quantum dot solution. The for removing heavy metal ionsin water comprises the following steps: adding a heavy metal ion solution to the carbon quantum dot solution, and after reacting, detecting the fluorescence change (quenching or enhancement) value ofthe carbon quantum dot solution to determine the selectivity of the carbon quantum dots to heavy metal ions; and adding the quantum dot solution to an aqueous solution containing heavy metal ions toremove the heavy metal ions from the water. The method has high selectivity and removal ability for heavy metals, is simple and rapid, and has important value for environmental treatment of heavy metal ion polluted water treatment and heavy metal recycling.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation and application, in particular, it provides a method for preparing carbon quantum dots by a heterogeneous nucleation hydrothermal method for removing heavy metal ions in water. Background technique [0002] Heavy metal pollution has become a social problem. Heavy metals are widely distributed in the atmosphere, water, soil, and organisms. When the environment changes, the forms of heavy metals will be transformed and released to cause pollution. Heavy metals cannot be biodegraded, are bioaccumulative, and can directly threaten higher organisms, including humans. Heavy metals pollute soil irreversibly. About 10% of the cultivated land in our country is polluted by heavy metals. According to recent reports, cadmium content in 10% of commercially available rice in southern my country exceeds the standard. Heavy metals in water can migrate and diffuse with water flow and irrigation...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the difficulty of removing heavy metal ions in water, especially the problem of selectively removing and recycling heavy metal ions in each water, to provide a method to determine the removal of heavy metal ions by using the fluorescence quenching of carbon quantum dots by heavy metal ions The selectivity and method of removal

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