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以柴油污染的海水为对象,研究了吸油草对海水中柴油的吸附、解吸规律,考察了海水盐度、温度和pH三因素对吸附的影响,并根据吸附等温线和吸附热力学的分析探讨了其吸附机理。研究结果表明,吸油草对海水中柴油的吸附及解吸均符合二级反应模式,达到吸附平衡仅需要10~20 min,而达到解吸平衡需要2~3 h,解吸平衡时间是吸附平衡时间的9倍,吸附速率远远大于解吸速率。吸油草对柴油的平衡吸附量和解吸量分别为6.69 g/g和0.325 g/g,释放率约为4.86%。吸附量随盐度的增大、pH的升高、温度的降低而增大。其吸附等温线可用Freundlich式和BET模式描述,属于多分子层吸附;通过热力学分析得知,该吸附属于物理吸附,吸附热约为-12.56 kJ/mol。
The effects of seawater salinity, temperature and pH on the adsorption of diesel oil in seawater were studied. The effects of seawater on the adsorption and desorption of diesel oil were studied. The adsorption isotherms and adsorption thermodynamics were discussed Its adsorption mechanism. The results showed that the adsorption and desorption of diesel oil by seaweed were both in accordance with the second order reaction mode. The adsorption equilibrium was only 10-20 min, while the desorption equilibrium was 2-3 h. The desorption equilibrium time was 9 Times, the adsorption rate is far greater than the desorption rate. The equilibrium adsorption and desorption amounts of sorbite to diesel oil were 6.69 g / g and 0.325 g / g respectively, and the release rate was about 4.86%. The amount of adsorption increased with the increase of salinity, pH and temperature. The adsorption isotherms can be described by Freundlich equation and BET mode, belonging to the multi-molecular layer adsorption. The thermodynamic analysis shows that the adsorption belongs to the physical adsorption, the adsorption heat is about -12.56 kJ / mol.