Gulnaz Osman, Kaya Aysenur, Dincer Sadik
Department of Biology, Faculty of Arts and Sciences, Cukurova University, 01330 Balcali, Adana, Turkey.
J Hazard Mater. 2006 Jun 30;134(1-3):190-6. doi: 10.1016/j.jhazmat.2005.10.050. Epub 2005 Dec 15.
Adsorption processes are alternative effective methods for removal of textile dyes from aqueous solutions. The adsorption ability of adsorbent affects by physico-chemical environment for this reason in this paper effect of initial pH, dye concentrations, temperature and dye hydrolyzation were determined in a batch system for removal of reactive dye by dried activated sludge. The Langmuir isotherm model was well described of adsorption reactive dye and maximum monolayer adsorption capacity (at pH 2) of activated sludge was determined as 116, 93 and 71mgg(-1) for 20 degrees , 35 degrees and 50 degrees C, respectively. Initial pH 2, 20 degrees C and 30min contact time are suitable for removal of reactive dyes from aqueous solutions. Activated sludge was characterized by FT-IR analysis and results showed that active sludge has different functional groups and functional groups of activated sludge are able to react with dye molecules in aqueous solution. The pseudo first-order, second-order and intraparticle diffusion kinetics were used to describe the kinetic data. The pseudo second-order kinetic model was fit well over the range of contact times and also an intra particle diffusion kinetic model was fit well but in the first 30min. The dye hydrolyzation was affected adsorption capacity of biomass and adsorption capacity of biomass decreased with dye hydrolyzation from 74 to 38mgg(-1).
吸附过程是从水溶液中去除纺织染料的有效替代方法。由于吸附剂的吸附能力受物理化学环境的影响，因此本文在间歇系统中测定了初始pH值、染料浓度、温度和染料水解对干燥活性污泥去除活性染料的影响。Langmuir等温线模型很好地描述了活性染料的吸附情况，活性污泥在20℃、35℃和50℃时的最大单层吸附容量（pH值为2时）分别测定为116、93和71mg g(-1)。初始pH值为2、温度为20℃和接触时间为30分钟适合从水溶液中去除活性染料。通过傅里叶变换红外光谱（FT-IR）分析对活性污泥进行了表征，结果表明活性污泥具有不同的官能团，且活性污泥的官能团能够与水溶液中的染料分子发生反应。采用拟一级、二级和颗粒内扩散动力学来描述动力学数据。拟二级动力学模型在接触时间范围内拟合良好，颗粒内扩散动力学模型在前30分钟内拟合良好。染料水解影响生物质的吸附容量，随着染料水解，生物质的吸附容量从74mg g(-1)降至38mg g(-1)。
