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Preparation and Application of Novel Chelating Fiber Based on Polyacrylonitrile

Author: ZhangZuoSong
Tutor: ZhangWenQin
School: Tianjin University
Course: Organic Chemistry
Keywords: Polyacrylonitrile Chelate fiber Heavy metals Adsorption
CLC: X703.1
Type: Master's thesis
Year: 2008
Downloads: 290
Quote: 2
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Abstract


With the rapid development of industry, environmental pollutants has led to the deterioration of the natural environment and human health caused serious harm. In terms of environmental pollutants, heavy metal pollution is particularly serious. Therefore, the preparation can handle heavy metal ions in water efficient adsorbent material is of great significance. The chelating fiber (CF) is a high adsorption material one of the main development direction. Firstly, polyacrylonitrile fibers (PANF) as the matrix, through amination and carboxymethylation reaction of a series of novel chelating fiber. By studying the reaction temperature, reaction time, substrate concentration on the functional response of experimental conditions to determine the optimum. The experimental results showed that: (1) Reaction of an amine of the growth of the polyamine chain gradually become difficult; (2) of the primary polyamine compound and a secondary amino groups are amine may participate amination; (3) Carboxymethyl reaction by acid concentration of more significant. Using infrared spectroscopy (IR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) analysis methods such as chelate fiber obtained were characterized and discussed the function of reaction mechanism. Second, select the appropriate chelating fiber for the study, determined its Cd 2 of saturated adsorption amount of pH and adsorption time on the Cd 2 adsorption capacity effect; measured at low concentrations of Cd 2 of adsorbed and studied the fiber regeneration and reuse in; also studied the fiber mixed solution of multi-metal Cd 2 < / sup>, Hg 2 , Pb 2 , Ni 2 , Cu 2 , Ag, Mg 2 and other metal ions adsorption properties and studied their actual sewage excessive heavy metals adsorbed Finally, we discuss the mechanism of adsorption of heavy metal fibers. The results showed that: (1) The fiber Cd 2 with a particularly good adsorption capacity, fast adsorption saturation adsorption capacity: 15 minutes to basic adsorption saturation adsorption capacity could reach 1.337 mmol / g; (2) after repeated ten times using adsorption capacity can reach 0.712 mmol / g; (3) of the mixed metal ion solution Cd 2 adsorption effect is very good, within 24 hours, you can The Cd 2 reduced from 0.5 ppm to 0.01 ppm or less. While the other metal ions and has a good adsorption effect; (4) the actual sewage Cd 2 adsorption effect is very good, within 24 hours to the Cd 2 reduced from 0.38 ppm to 0.01 ppm or less.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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