Marungrueng Khanidtha, Pavasant Prasert
National Research Center for Environmental and Hazardous Waste Management, Chulalongkorn University, 10330 Bangkok, Thailand.
J Environ Manage. 2006 Feb;78(3):268-74. doi: 10.1016/j.jenvman.2005.04.022. Epub 2005 Aug 19.
The macroalga Caulerpa lentillifera was found to have adsorption capacity for a basic dye, Astrazon Blue FGRL. For the whole range of concentrations employed in this work (20-1280 mgl(-1)), the adsorption reached equilibrium within the first hour. The kinetic data corresponded well with the pseudo second-order kinetic model where the rate constants decreased as initial dye concentrations increased. At low dye concentrations (20-80 mgl(-1)), an increase in the adsorbent dosage resulted in a higher removal percentage of the dye, but a lower amount of dye adsorbed per unit mass (q). The adsorption isotherm followed both the Langmuir and Freundlich models within the temperature range employed in this work (18-70 degrees C). The highest maximum adsorption capacity (q(m)) was obtained at 50 degrees C. The enthalpy of adsorption was estimated at 14.87 kJmol(-1) suggesting a chemical adsorption mechanism.
研究发现，大型海藻蕨藻对碱性染料阿斯特拉宗蓝FGRL具有吸附能力。在本研究采用的整个浓度范围内（20 - 1280 mgL⁻¹），吸附在第一小时内达到平衡。动力学数据与伪二级动力学模型吻合良好，其中速率常数随初始染料浓度的增加而降低。在低染料浓度（20 - 80 mgL⁻¹）下，吸附剂用量的增加导致染料去除率更高，但单位质量吸附的染料量（q）更低。在本研究采用的温度范围内（18 - 70℃），吸附等温线符合朗缪尔模型和弗伦德利希模型。在50℃时获得了最高的最大吸附容量（qₘ）。吸附焓估计为14.87 kJmol⁻¹，表明存在化学吸附机制。
