In this work, geopolymer synthesized with perlite and an alkaline activator medium was evaluated as a new adsorbent and photocatalyst for degradation of methylene blue (MB) dye from an aqueous medium. The functional group, the structure, and the morphology of the raw and the synthesized materials were characterized using FT-IR, XRD, and SEM analysis. The degradation of MB in the contaminated solution was examined using the spectrophotometric technique. Several analysis methods revealed the formation of the aluminosilicate gel after the geopolymerization reaction. The kinetics data with UV and without UV irradiations were well fitted with the pseudo-second-order equation. The results indicated that the degradation efficiency of cationic dye by perlite-based geopolymer without and with UV was up to 88.94% and 97.87% in 4 hours, respectively. The degradation efficiencies of methylene blue are in the following order: perlite-based geopolymer under UV irradiations is greater than perlite-based geopolymer without UV irradiations that is larger than UV irradiations. The overall experimental results suggested that the new elaborated material with synergetic adsorption and photocatalytic activities has a great potential for the treatment of water contaminated by hazardous substances.

中文翻译：

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亚甲基蓝从水性介质到珍珠岩基地质聚合物的光催化降解

在这项工作中，评估了用珍珠岩和碱性活化剂介质合成的地聚合物作为一种新型吸附剂和光催化剂，用于从水性介质中降解亚甲基蓝（MB）染料。使用FT-IR，XRD和SEM分析对原料和合成原料的官能团，结构和形态进行表征。使用分光光度法检查污染溶液中MB的降解情况。几种分析方法揭示了地聚反应后铝硅酸盐凝胶的形成。在有紫外线和无紫外线照射下的动力学数据与拟二阶方程很好地拟合。结果表明，有和没有紫外线的珍珠岩基地质聚合物在4小时内对阳离子染料的降解效率分别达到88.94％和97.87％。亚甲蓝的降解效率按以下顺序排列：在紫外线照射下，基于珍珠岩的地质聚合物比在没有紫外线照射下的基于珍珠岩的地质聚合物大于紫外线照射。总体实验结果表明，具有协同吸附和光催化活性的新型精制材料在处理有害物质污染的水方面具有巨大潜力。