巯基乙酸改性橘子皮对Pb2+吸附性能的研究
首发时间:2009-01-22
摘要:本文研究了经巯基乙酸改性的橘子皮吸附剂对Pb2+的吸附性能。考察了溶液pH值、吸附时间及Pb2+初始浓度对该吸附剂吸附性能的影响。结果表明,吸附过程可以很好地用准二级动力学方程描述,吸附等温线用Langmuir方程拟合效果优于Freundlich方程。pH4.5,30℃时最大吸附容量为146.413mg•g-1。经改性的橘子皮可重复使用5次以上。
关键词: 改性橘子皮 巯基乙酸 Pb2+ 吸附动力学 吸附热力学
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Study on adsorption of Pb2+ by mercapto-acetic acid modification of orange peel
Abstract:In this study, orange peel adsorbent, which was chemically modified by mercapto-acetic acid, was used for lead adsorption in aqueous solutions. Effects of various parameters, including solution pH, adsorption time and initial Pb2+ concentration were studied by batch experiments. Kinetics was found to be best-fit pseudo-second order equations. Equilibrium was well described by Langmuir isotherms rather than Freudlich isotherms. At pH4.5, 30℃, the maximum adsorption capacity was 146.413mg•g-1. This biosorbent was suitable for repeated use for more than five cycles.
Keywords: Modified orange peel Mercapto-acetic acid Pb2+ Adsorption kinetics Adsorption isotherms
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