Su Chengyuan, Wang Liang, Chen Menglin, Huang Zhi, Lin Xiangfeng
School of Environment and Resources, Guangxi Normal University, Guilin 541004, China E-mail:
Water Sci Technol. 2016;74(4):844-51. doi: 10.2166/wst.2016.261.
In this study, the dynamic adsorption of methylene blue dye onto CuO-acid modified sepiolite was investigated. Meanwhile, the equilibrium and kinetic data of the adsorption process were studied to understand the adsorption mechanism. Furthermore, a high-temperature gas stream was applied to regenerate the adsorbent. The results showed that the Langmuir isotherm model was applied to describe the adsorption process. The positive value of enthalpy change indicated that the adsorption process was endothermic in nature. In the dynamic adsorption process, the best adsorption performance was achieved when the ratio of column height to diameter was 2.56 and the treatment capacity was 6 BV/h. The optimal scenario for regeneration experiments was the regeneration temperature of 550-650 °C, the space velocity of 100 min(-1) and the regeneration time of 10 min. The effective adsorption of CuO-acid modified sepiolite was kept for 12 cycles of adsorption and regeneration.
本研究考察了亚甲基蓝染料在CuO-酸改性海泡石上的动态吸附情况。同时，研究了吸附过程的平衡和动力学数据，以了解吸附机理。此外，采用高温气流对吸附剂进行再生。结果表明，Langmuir等温线模型适用于描述吸附过程。焓变的正值表明吸附过程本质上是吸热的。在动态吸附过程中，当柱高与直径之比为2.56且处理量为6 BV/h时，吸附性能最佳。再生实验的最佳条件是再生温度为550-650℃，空速为100 min(-1)，再生时间为10 min。CuO-酸改性海泡石在12次吸附和再生循环后仍保持有效吸附性能。
