Liang Guangbing, Li Yanhong, Yang Chun, Hu Xun, Li Qingyin, Zhao Wenbo
Faculty of Chemical Engineering, Kunming University of Science and Technology Kunming 650500 China
College of Chemical Engineering and Environment, China University of Petroleum Beijing 102249 China.
RSC Adv. 2021 Jun 24;11(36):22365-22375. doi: 10.1039/d1ra03847h. eCollection 2021 Jun 21.
In this work, industrial biomass power plant ash was used to synthesize the ZSM-5 zeolites for the first time with the original intention to turn value-added material into wealth, and then committed to adsorption performance testing. Typical chemical structure and morphology of ZSM-5 zeolite were identified by comprehensive technologies. Uniquely, it was found that there was a low pressure hysteresis loop which was caused by crossed 10-membered rings in the N adsorption-desorption isotherm. To investigate the adsorption performance for dyes, the zeolite samples were used to remove cationic (MB) and anionic (CR) dyes from aqueous. The results demonstrated that when it came to adsorbing MB, the isotherm was in line with the Redlich-Peterson model ( > 0.99), whereas it was matched up with the Sips model ( > 0.99) for adsorbing CR. Kinetic models were assigned to the pseudo-second order equation ( ≥ 0.99) along with remarkable intraparticle diffusion. In the end, thermodynamic parameters were Δ < 0, and > 0. Especially, adsorbing MB was Δ > 0, and Δ > 0, whilst adsorbing CR was Δ < 0, and Δ < 0, which indicates that electrostatic interaction plays a significant role in the whole process. All in all, this work might encourage novel attempts to dispose of industrial biomass ash.
在这项工作中，首次使用工业生物质发电厂灰分合成ZSM-5沸石，旨在将增值材料转化为财富，然后致力于吸附性能测试。通过综合技术确定了ZSM-5沸石的典型化学结构和形态。独特的是，在N吸附-脱附等温线中发现了由交叉十元环引起的低压滞后环。为了研究对染料的吸附性能，使用沸石样品从水溶液中去除阳离子（亚甲基蓝，MB）和阴离子（铬酸盐，CR）染料。结果表明，在吸附MB时，等温线符合Redlich-Peterson模型（R²>0.99），而在吸附CR时，它与Sips模型匹配（R²>0.99）。动力学模型被指定为伪二级方程（R²≥0.99）以及显著的颗粒内扩散。最后，热力学参数为ΔH<0，ΔS>0。特别是，吸附MB时ΔH>0，ΔS>0，而吸附CR时ΔH<0，ΔS<0，这表明静电相互作用在整个过程中起着重要作用。总而言之，这项工作可能会鼓励在处理工业生物质灰分方面进行新的尝试。
