Nemr Ahmed El, Abdelwahab Ola, El-Sikaily Amany, Khaled Azza
Department of Pollution, Environmental Division, National Institute of Oceanography and Fisheries, El-Anfoushy, Kayet Bey, Alexandria, Egypt.
J Hazard Mater. 2009 Jan 15;161(1):102-10. doi: 10.1016/j.jhazmat.2008.03.060. Epub 2008 Mar 21.
The use of low-cost, easy obtained, high efficiency and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing dyes from wastewater. This study investigates the potential use of activated carbon prepared from orange peel for the removal of direct blue-86 (DB-86) (Direct Fast Turquoise Blue GL) dye from simulated wastewater. The effects of different system variables, adsorbent dosage, initial dye concentration, pH and contact time were studied. The results showed that as the amount of the adsorbent increased, the percentage of dye removal increased accordingly. Optimum pH value for dye adsorption was determined as approximately 2.0. Maximum dye was sequestered within 30min after the beginning for every experiment. The adsorption of direct blue-86 followed a pseudo-second-order rate equation and fit well Langmuir, Tempkin and Dubinin-Radushkevich (D-R) equations better than Freundlich and Redlich-Peterson equations. The maximum removal of direct blue-86 was obtained at pH 2 as 92% for adsorbent dose of 6gL(-1) and 100mgL(-1) initial dye concentration at room temperature. The maximum adsorption capacity obtained from Langmuir equation was 33.78mgg(-1). Furthermore, adsorption kinetics of DB-86 was studied and the rate of adsorption was found to conform to pseudo-second-order kinetics with a good correlation (R2>0.99) with intraparticle diffusion as one of the rate determining steps. Activated carbon developed from orange peel can be attractive options for dye removal from diluted industrial effluents since test reaction made on simulated dyeing wastewater show better removal percentage of DB-86.
使用低成本、易获取、高效且环保的吸附剂作为目前从废水中去除染料的昂贵方法的理想替代方案已得到研究。本研究调查了由橙皮制备的活性炭对模拟废水中直接蓝 - 86（DB - 86）（直接耐晒翠蓝GL）染料的潜在去除作用。研究了不同系统变量、吸附剂用量、初始染料浓度、pH值和接触时间的影响。结果表明，随着吸附剂用量增加，染料去除百分比相应增加。确定染料吸附的最佳pH值约为2.0。每次实验开始后30分钟内染料的吸附量最大。直接蓝 - 86的吸附遵循准二级速率方程，与Langmuir、Tempkin和Dubinin - Radushkevich（D - R）方程的拟合效果优于Freundlich和Redlich - Peterson方程。在室温下，对于6gL(-1)的吸附剂剂量和100mgL(-1)的初始染料浓度，在pH为2时直接蓝 - 86的最大去除率为92%。从Langmuir方程获得的最大吸附容量为33.78mgg(-1)。此外，研究了DB - 86的吸附动力学，发现吸附速率符合准二级动力学，与颗粒内扩散作为速率决定步骤之一具有良好的相关性（R2>0.99）。由于对模拟印染废水进行的测试反应显示DB - 86的去除率更高，由橙皮开发的活性炭可能是从稀释工业废水中去除染料的有吸引力的选择。
