Dulman Viorica, Cucu-Man Simona Maria
Department of Inorganic and Analytical Chemistry, "Al. I. Cuza" University, 11 Carol I Boulevard, Iasi 700506, Romania.
J Hazard Mater. 2009 Mar 15;162(2-3):1457-64. doi: 10.1016/j.jhazmat.2008.06.046. Epub 2008 Jun 21.
The purpose of this paper is to establish the experimental conditions for removal of several textile dyes from aqueous solutions by sorption on beech wood sawdust, an industrial waste lignocellulosic product. From the six dyes tested, the sorbent shows preference for three dyes: Direct Brown, Direct Brown 2 and Basic Blue 86. Sorption of dyes on the beech wood sawdust is dependent on the nature of dye, pH, dyes concentration, contact time, and amount of sorbent. By comparative kinetic studies, the rate of sorption was found to conform with good correlation to pseudo-second-order kinetics. The parameters that characterize the sorption were determined on the basis of Langmuir isotherms. The preference of beech sawdust for dyes increases as follows: Basic Blue 86<Direct Brown 2<Direct Brown. The maximum capacity of sorption of the commercial dye (of approximately 60% purity) was found to be 526.3 mg g(-1) for Direct Brown.
本文的目的是建立以工业废弃木质纤维素产品山毛榉木屑为吸附剂从水溶液中去除几种纺织染料的实验条件。在所测试的六种染料中，该吸附剂对三种染料表现出偏好：直接棕、直接棕2和碱性蓝86。染料在山毛榉木屑上的吸附取决于染料的性质、pH值、染料浓度、接触时间和吸附剂的用量。通过比较动力学研究，发现吸附速率与伪二级动力学具有良好的相关性。基于朗缪尔等温线确定了表征吸附的参数。山毛榉木屑对染料的偏好顺序如下：碱性蓝86＜直接棕2＜直接棕。对于直接棕，发现商业染料（纯度约为60%）的最大吸附容量为526.3 mg g(-1)。
