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The Treatment of Wastewater Containing Aromatic Compounds and the Deposition of Silver Nanoparticles

Author: ZhangJiaZhi
Tutor: LiangHaoJun
School: University of Science and Technology of China
Course: Polymer Chemistry and Physics
Keywords: aromatic compounds adsorbent resin Freundlich model adsorption thermodynamics silver nanoparticles humic acid deposition quartz crystal microbalance
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 1
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Abstract


This thesis consists two sections: the adsorption of aromatic compounds by adsorbent resin and the deposition of silver nanoparticles onto humic acid-coated silica surface.The discharge of untreated wastewaters containing extraordinarily toxic aromatic compounds, such as phenols and anilines, is very harmful. Adsorbent resins have significant advantages in wastewater treatment to remove aromatic compounds. Though most research to date has focused on the adsorption of pollutants in pure component system, industrial wastewaters often contain many kinds of pollutants. In aromatic weak acid—weak base mixture systems, one adsorbate with Lewis acid functional group and another with basic group lead the intermolecular interactions more complicated, and the adsorption behaviors and mechanism onto adsorbent resin are not thoroughly understood. In this dissertation the static equilibrium adsorption of phenol, aniline, p-chlorophenol, p-chloroaniline in pure component systems, phenol—aniline and p-chlorophenol—p-chloroaniline in two-component systems on DA201-CⅡwere investigated at different temperatures. The results show that all the adsorption isotherms of pure component systems correlated with Freundlich equation within the studied range of temperature and concentration, and the adsorption capacity follows the order phenol <aniline <p-chlorophenol <p-chloroaniline. The adsorption data of each component in two-component systems also fit Freundlich model. In comparison with the adsorption of pure component systems at the same equilibrium concentration, the coexistence of phenol and aniline molecules in aqueous solution will heighten the total adsorbed amounts of this binary solutes system, while the total uptakes from p-chlorophenol—p-chloroaniline system decrease, below those from single p-chloroaniline. Moreover, reasons for adsorption phenomenon and the adsorption thermodynamics were analyzed.Nano-silver materials with excellent performance have been widely used in the pharmaceutical, food, textiles and other industries. Some silver nanoparticles are released into natural environment inevitably during mass production and application. At present, the risks of silver nanoparticles on health and ecology have aroused wide concern. Studies on the interaction between silver nanoparticles and humic acid as a major natural organic substance are significant to better understand the migration and transformation of nanoparticles in the ecological environment. In this article, the deposition amounts and rates of silver nanoparticles onto the humic acid-coated silica surface in terms of electrolyte concentrations, the background humic acid, pH, nanoparticles contents and temperature were determined by Quartz crystal microbalance, which is an extremely sensitive mass sensor. The results show that the deposition amounts of nanoparticles increase with the concentrations of monovalent (NaCl) and divalent (CaCl2) electrolyte over the investigated ranges. The deposition rate of nanoparticles primary increases rapidly with NaCl concentration and then at a modest extent, while it has little effect with CaCl2 concentration owing to the complex formation of humic acid with Ca2+ ions. The presence of background humic acid in the nanoparticles solution results in noticeable declines of the deposition rate about two orders of magnitude, as well as the deposition amounts with one order of magnitude or so, resulting from electrostatic repulsion and steric repulsion. The deposition rate changes unobvious in different pH, while the deposition amounts are different. In addition, more nanoparticles would deposit onto the humic acid-coated surface at greater nanoparticles content and higher temperature.

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