Geopolymer beads, conceived as alternative low cost adsorbents for wastewater treatment, were shaped by a dripping technique in liquid nitrogen, through an ice-templating process. PEG600 was added as a binder to ease the process, standardizing the beads dimension. The beads were investigated in terms of morphology, microstructure and mechanical strength, following compressive tests by ISO 18591. Functional tests, to verify the adsorption capacity, were conducted using methylene blue (MB) with different concentrations and for different contact time. The removal efficiency was mainly related to the morphology and porosity of the beads, which in turn was directly related to the water content added to the geopolymer slurry. In general, all beads reached an average removal efficiency of 98% after 24 h. However, the best performing beads were able to uptake MB very quickly, attaining a removal efficiency of 76% after only 30 min.

中文翻译：

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冰样的地质聚合物珠粒，用于去除染料。

地质聚合物珠粒，被认为是用于废水处理的低成本替代吸附剂，是通过滴冰技术在液氮中通过冰模板工艺成型的。加入PEG600作为粘合剂以简化该过程，使珠子尺寸标准化。通过ISO 18591的压缩测试，对珠子进行了形态，微观结构和机械强度方面的研究。使用不同浓度和不同接触时间的亚甲基蓝（MB）进行功能测试，以验证吸附能力。去除效率主要与珠子的形态和孔隙率有关，而珠子的形态和孔隙率又与添加到地质聚合物浆料中的水含量直接相关。通常，所有小珠在24小时后均达到98％的平均去除效率。然而，