地质聚合物微球的制备及对染料的吸附

以偏高岭土和改性水玻璃为原料，采用分散悬浮固化法制备偏高岭土基地质聚合物微球（GM）。使用扫描电子显微镜、比表面积及孔径分布测试仪、傅里叶变换红外光谱仪和X射线粉末衍射仪对其进行结构表征，并研究了GM对亚甲基蓝的吸附性能。结果表明：GM对亚甲基蓝的吸附基本符合准二级动力学模型和Langmuir吸附等温线模型，333 K时最大理论吸附量为100.1 mg/g。GM对亚甲基蓝的吸附是自发吸热过程。使用后的GM在5次循环利用后，GM对MB的去除率仍然可达81.56%，易于回收和再生。分析了GM对不同阴阳离子型染料的吸附效果，结果表明，GM对阳离子型染料具有选择性吸附。GM是一种低价、有效、绿色、可循环利用的吸附剂，可用于去除水中阳离子型染料污染物。

Fabrication of geopolymer microspheres for dye adsorption

A metakaolin-based geopolymer microsphere (GM) was prepared from metakaolin and modified water glass by a dispersion suspension and solidification method. The morphology of the GM was characterized by SEM, XRD, FTIR and BET studies. Its adsorption performance and mechanism of GM towords Methylene blue (MB) were studied. The results showed that the adsorption process of MB onto GM could be described by the pseudo-first-order model and Langmuir adsorption isotherm model. The maximum theoretical adsorption capacity of MB onto GM was 100.1 mg/g. The adsorption process of MB by GM was a spontaneous and endothermic process. Furthermore, after using GM for 5 cycles, the removal rate of MB by GM can still reach 81.56%, which is easy to recycle and regenerate. GM had strong selective adsorption ability to cationic dyes, by comparing adsorption ability of cationic and anionic dyes. The GM was low-cost, efficient, green and sustainable adsorbents for removal of cationic dyes in water.