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Studies on Combined Sorption Behaviors of Cationic Surfactant and Heavy Oil on Marine Sediments

Author: ZhengCuiYing
Tutor: CaoXiaoYan
School: Ocean University of China
Course: Marine Chemistry
Keywords: Marine sediments Heavy oil CTAB Adsorption Combined pollution
CLC: X55
Type: Master's thesis
Year: 2010
Downloads: 74
Quote: 1
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Abstract


The combined pollution has become one of the important direction of the development of environmental chemistry. With the development of industry and agriculture, a growing number of organic pollutants into the environment, a single environmental pollution makes absolute sense no longer exists. Complex interaction between the coexistence pollutants, the environmental behavior of the composite pollution and its effects have become more and more obvious. An adsorption behavior of the organic pollutants in the environment, not only their physical and chemical properties, sediment (soil) chemical composition, structure, and are often influenced by environmental factors (temperature, salinity, coexistence of organic pollutants subject to organic pollutants) the impact. Petroleum contaminants and surface active agent is a common organic pollutants in the ocean, has great impact on human and marine life, aroused extensive attention of chemists and environmental scientists. Marine sediments of petroleum pollutants and the adsorption of the surfactant to affect their behavior and fate in the environment, one of the main factors to study the adsorption behavior of petroleum pollutants and surfactant coexist both in marine sediments , is conducive to the understanding of their migration and transformation in the environment, have good practical significance of marine science and environmental science. Artificial seawater medium, the papers focus on heavy oil and cationic surfactant cetyltrimethylammonium bromide (CTAB), to investigate the combined pollution in Jiaozhou Bay sediments on adsorption kinetics and The adsorption thermodynamic behavior, medium (salinity), temperature and other factors on the adsorption behavior of heavy oil and CTAB sediment. The following conclusions: (1) Kinetic studies have shown that the the sediment adsorption kinetics of heavy oil and CTAB heavy oil-CTAB complex system can be better described by pseudo-second-order kinetic model. (2) heavy oil-CTAB composite system in heavy oil and CTAB sediment adsorption isotherms are nonlinear, compared with better fit the Freundlich isotherm. (3) heavy oil-CTAB composite system, the amount of sediment adsorption of heavy oil is increased with the increase in the CTAB initial concentration, the increase of salinity, temperature decreases; sediment adsorption of CTAB With the initial concentration of heavy oil decreases, the increase of salinity, the decrease of temperature increase. (4) the thermodynamic studies have shown that the the adsorption thermodynamic functions of the sediments of the heavy oil to the ΔG0 lt; 0 ΔH0 lt; 0, ΔS0 lt; 0, show that the adsorption of heavy oil in marine sediments as physical adsorption is a spontaneous, exothermic entropy decreases process. Sediments of CTAB adsorption thermodynamic functions the ΔG0 lt; 0 ΔH0 lt; 0 ΔS0 gt; 0 adsorption of CTAB in marine sediments on the adsorption process is a white-haired, exothermic, entropy increase.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Marine pollution and its prevention
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