Synthetic method of chelating fiber with selective adsorption on Cr (VI)

Abstract

The invention discloses a synthetic method of chelating fiber with selective adsorption on Cr (VI). The method comprises the following steps: 1) soaking acrylic acid grafted polytetrafluoroethylene fiber in N,N-dimethylformamide for 12-14 h by using acrylic acid grafted polytetrafluoroethylene fiber as a matrix; 2) adding ligand into the product obtained in the step 1), reacting with stirring at 30-50 DEG C for 11-14 h, wherein the ligand is carbohydrazide, and the molar ratio of functional group -COOH and ligand in the matrix is 1:4-6; and 3) filtering the product obtained in the step 2), washing the filter cake, drying the filter cake to a constant weight to obtain chelating fiber CHF with selective adsorption on Cr (VI) ions. The chelating fiber CHF fiber has good selective adsorption performance on Cr (VI) ions in the mixed heavy metal ion solution.

Description

technical field [0001] The present invention relates to a kind of method of synthesizing novel chelate fiber, be specifically related to take grafted acrylic polytetrafluoroethylene fiber as matrix, take carbohydrazide as ligand, thereby synthetic energy has the effect on Cr(VI) ion in mixed heavy metal ion solution Method for efficient selection of adsorption properties of chelated fiber CHF. Background technique [0002] With the rapid development of industrial and agricultural production and science and technology, people are consuming a lot of natural resources and polluting people's living environment while promoting economic prosperity and creating wealth. Heavy metal pollution has become one of the most serious ecological pollution, which seriously affects the sustainable development of economy and human health. [0003] Heavy metal pollution in food is an important project of the global food pollution monitoring program of the Food and Agriculture Organization of th...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is mainly that the price of the extraction agent used is mostly expensive, the organic solvent is more volatile, and the environmental pollution is serious. Another common problem in the extraction of heavy metals is that the composition of the feed liquid needs to be adjusted before extracting each heavy metal, and The multi-stage extraction process is also cumbersome, and sometimes it is easy to form a third phase

However, due to the fact that some adsorption reactions occur inside the microspheres during elution, and are affected by the cross-linked network, there are disadvantages such as tailing during elution, which greatly reduces the reuse efficiency of the chelating resin.

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