摘要
采用十六烷基三甲基溴化铵对天然草本泥炭进行改性,并进行了表面性质的表征。同时,研究了改性草本泥炭对双酚A的吸附性能。改性后草本泥炭的疏水性显著增强,有机碳含量由43.85%增加至49.94%,其在水中的Zeta电位由-42.5mV增加至-32.6mV。双酚A在改性草本泥炭上的吸附符合Langmuir和Freundlich吸附模型。与天然草本泥炭相比,改性草本泥炭对双酚A的吸附常数由0.018L/mg增加至0.054 L/mg,平衡吸附量提高了220%以上。准二级动力学模型可以很好地描述双酚A在草本泥炭上的吸附过程,改性后草本泥炭对双酚A的吸附速率加快。双酚A在草本泥炭上的吸附量随着水中阳离子浓度的增加而提高,碱性条件不利于双酚A在草本泥炭上的吸附。研究表明,疏水性增强和表面电负性减弱是改性草本泥炭对双酚A吸附性能显著提高的主要原因。
Fabric peat was modified by hexadecyltrimethylammonium bromide for sorption of bisphenol A from water.The surface properties of modified fabric peat were characterized and its sorption capacity of bisphenol A was also investigated.The modified fabric peat was found to be more organophilic,the organic carbon content and zeta potential of modified fabric peat increased from 43.85% to 49.94% and-42.5 mV to-32.6 mV respectively.The sorption isotherms followed Langmuir model and Freundlich model.Through modification,the sorption constant increased from 0.018 L/mg to 0.054 L/mg and the equilibrium sorption capacity increased by over 220%.The sorption kinetics followed pseudo-second order model and the sorption rate of modified fabric peat was much quicker.It was also found that the equilibrium sorption capacity of modified fabric peat increased with the increase of cation concentration in water.In addition,it was found that pH influence the sorption process significantly.Results suggested that the enhanced hydrophobicity and less negatively charged surface are the most important reasons for the significantly improved sorption capacity of modified fabric peat for bisphenol A.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第2期53-58,共6页
Environmental Science & Technology
基金
上海市重点学科基金资助项目(B506)
上海市自然科学基金项目资助(10ZR1408000)
关键词
双酚A
泥炭
改性
疏水性
bisphenol A
peat
modification
hydrophobicity
