Chemistry Department, Islamic University of Indonesia, Yogyakarta, Indonesia.
Water Sci Technol. 2010;62(5):1177-82. doi: 10.2166/wst.2010.388.
An agricultural waste derived adsorbent was prepared by chemically modified barley straw with NaOH and a cationic surfactant hexadecylpyridinium chloride monohydrate (CPC). The prepared adsorbent, BMBS, was used for removal of anionic dyes; Acid Blue (AB40) and Reactive Blue 4 (RB4) from aqueous solution in a batch adsorption system. The adsorbent was characterized by FT-IR and elemental composition. The stability of CPC adsorbed on straw surface was also evaluated by exposing to aqueous solution. In adsorption tests, influence of operation parameters such as contact time, initial concentration and pH of solution on AB40 and RB4 uptake were investigated and discussed. The CPC was observed strongly attached to straw surface and removal percentage of AB40 and RB4 was increased with increasing in contact time. The adsorption of dyes on modified straw surface was favorable at high acidic condition and desorption was found relatively low upon exposing to the desorption agent (i.e water). Dynamic experiment revealed that the kinetic data fitted well to the pseudo-second-order model for both of the dyes. The isotherm study also indicated that RB4 and AB40 adsorption suited well with the Langmuir model, The maximum adsorption capacity determined from the Langmuir isotherm at 25 degrees C was 51.95 mg g(-1) and 31.5 for AB40 and RB4, respectively.
一种农业废弃物衍生的吸附剂是通过用 NaOH 和阳离子表面活性剂十六烷基吡啶氯单水合物（CPC）对大麦秸秆进行化学改性制备的。所制备的吸附剂 BMBS 用于从水溶液中批量吸附系统中去除阴离子染料;酸性蓝（AB40）和活性蓝 4（RB4）。通过 FT-IR 和元素组成对吸附剂进行了表征。还通过将 CPC 暴露于水溶液来评估吸附在秸秆表面上的 CPC 的稳定性。在吸附试验中，研究并讨论了操作参数（如接触时间，初始浓度和溶液 pH）对 AB40 和 RB4 吸收的影响。观察到 CPC 强烈附着在秸秆表面上，并且随着接触时间的增加，AB40 和 RB4 的去除率增加。在高酸性条件下，染料在改性秸秆表面上的吸附是有利的，并且在暴露于解吸剂（即水）时发现解吸相对较低。动态实验表明，两种染料的动力学数据均很好地符合伪二级模型。等温研究还表明，RB4 和 AB40 的吸附均符合 Langmuir 模型，在 25°C 下从 Langmuir 等温线确定的最大吸附容量分别为 51.95 mg g(-1)和 31.5。
