Reactive blue-13 (RB-13) dye was removed using magnetic activated carbon (MAC) in the batch mode. The effect of the initial mass of the adsorbent (1–25 g/L), initial RB-13 concentration (10–50 mg/L), solution pH (2–12), temperature (298–333 K), and contact period (0–120 min) on the removal of RB-13 dye was explored. The isoelectric point study was also performed for determining the pH at which the net charge on the surface of MAC was equivalent to zero. The Langmuir adsorption isotherm showed the best correlation at all temperatures. The adsorption kinetics was best described by a pseudo-second-order model. Thermodynamic study concluded that the adsorption of RB-13 dye onto MAC took place exothermically and the process was spontaneous.

中文翻译：

---

磁化活性炭从水溶液中吸附酸性染料活性蓝-13

使用磁性活性炭（MAC）以批处理模式除去了活性蓝13（RB-13）染料。吸附剂初始质量（1–25 g / L），RB-13初始浓度（10–50 mg / L），溶液pH（2–12），温度（298–333 K）和接触的影响探索了去除RB-13染料的时间（0-120分钟）。还进行了等电点研究，以确定MAC表面的净电荷等于零的pH值。Langmuir吸附等温线在所有温度下均显示出最佳相关性。吸附动力学最好用拟二级模型来描述。热力学研究表明，RB-13染料在MAC上的吸附是放热的，并且过程是自发的。