School of Resources, Environment and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004 Guangxi, China.
Institute of Chemical Sciences, University of Peshawar, 25120 KP, Pakistan.
J Hazard Mater. 2021 Mar 15;406:124292. doi: 10.1016/j.jhazmat.2020.124292. Epub 2020 Oct 27.
Herein we report the fabrication of metakaolin/slag-based geopolymer microspheres by dispersion-suspension-solidification technology, and were then transformed into zeolite microspheres by in-situ thermal curing. The rheological properties and mechanical strength of metakaolin/slag-based zeolite microspheres (M/SZMs) were improved by adding slag. The zeolite microspheres were texturally and morphologically characterized by BET, SEM-EDX and XRD techniques. At 20% slag contents of the total mass of M/SZMs, the specific surface area was significantly increased without changing the structure of the zeolite. Rheological properties analysis of slurry revealed pseudoplastic fluid phase and fitted well to Herschel-Bulkley model. The adsorptive removal data of M/SZMs for Cs and Sr from wastewater followed pseudo-second-order kinetics. The maximum adsorption capacity of M/SZMs for Cs and Sr was 103.74 mg/g and 54.90 mg/g and were best explained by Freundlich and Langmuir isotherm models, respectively. M/SZMs exhibited excellent dynamic separation effect in column-based experimental set up. In addition, M/SZMs also realized outstanding adsorptive removal performance for Cs and Sr from different real wastewater samples. Owing to the simplistic fabrication approach, low cost and highly efficacious nature, M/SZMs can be ranked as alternative candidates for the abatement of Cs and Sr from wastewater.
在此，我们报告了通过分散-悬浮-固化技术制备偏高岭土/矿渣基地聚体微球，并通过原位热固化将其转化为沸石微球。通过添加矿渣，提高了偏高岭土/矿渣基地沸石微球（M/SZMs）的流变性和力学强度。采用 BET、SEM-EDX 和 XRD 技术对沸石微球的结构和形貌进行了表征。当 M/SZMs 总质量的矿渣含量为 20%时，比表面积显著增加，而沸石的结构没有改变。浆液的流变性分析表明其为假塑性流体相，符合 Herschel-Bulkley 模型。M/SZMs 对废水中 Cs 和 Sr 的吸附去除数据遵循准二级动力学。M/SZMs 对 Cs 和 Sr 的最大吸附容量分别为 103.74mg/g 和 54.90mg/g，分别由 Freundlich 和 Langmuir 等温模型最佳解释。M/SZMs 在基于柱的实验装置中表现出优异的动态分离效果。此外，M/SZMs 还在不同实际废水样品中对 Cs 和 Sr 表现出优异的吸附去除性能。由于其简单的制备方法、低成本和高效性，M/SZMs 可以作为废水除 Cs 和 Sr 的替代候选物。
