文獻名：Facile fabrication of metakaolin/slag-based zeolite microspheres (M/SZMs) geopolymer for the efficient remediation of Cs+ and Sr2+ from aqueous media

作者：Huiye Lei^a， Yaseen Muhammad^b， Kaituo Wang^a， Min Yi^a， Chunlin He^a， Yuezhou Wei^a， Toyohisa Fujita^a

^a School of Resources, Environment and Materials, Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning, 530004 Guangxi, China

^b Institute of Chemical Sciences, University of Peshawar, 25120 KP, Pakistan

摘要：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 Sr²⁺ from wastewater followed pseudo-second-order kinetics. The maximum adsorption capacity of M/SZMs for Cs⁺ and Sr²⁺ 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 Sr²⁺ 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 Sr²⁺ from wastewater.

關鍵詞：Dispersion-suspension-solidification; Rheological properties; Column adsorption of Cs⁺ and Sr²⁺; Co-existing ions; Textural characterization