Organic dyes discharged from industries have significant effect on ecosystem and health of human being because of their toxicity and appearing colour in the wastewater. Absorption method is a more preferable method than other wastewater treatment methods due to its characteristics of being eco-friendly, simple, and efficient. Zeolites are among the porous materials often used as absorbent of organic dye from wastewater. However, wide use of zeolite has been limited due to its expensive precursors and synthesized methods (i.e., hydrothermal method which needs expensive autoclave). In this work, cheap and widely available precursors aluminum from waste food packaging aluminum foil and low cost silica from sugar cane bagasse ash were used to synthesized zeolite without hydrothermal method (Z-B), where hydrothermally synthesized zeolite (Z-A) was used as a reference. The XRD patterns revealed that Z-B was sodalite octahydrate zeolite and Z-A was zeolite Linde Type A (LTA). The morphology and type of bond in both zeolites were investigated by SEM and FTIR. The synthesized zeolites were used as absorbents for absorbing methylene blue (MB) from aqueous solutions. The MB removal efficiency of the synthesized zeolites was evaluated by using UV-Visible spectroscopy. The results indicate that the absorption capacities of Z-B and Z-A were 3.5 mg/g and 3.9 mg/g at 40 mg/L, respectively. Optimum removal efficiencies of both zeolites were observed at PH of 7 and adsorbent dosage of 0.005 mg/L. The stabilities of both zeolites were tested three times. The absorption isotherms of sodalite octahydrate zeolite and zeolite LTA were effectively fitted with the Freundlich and Langmuir modes. Moreover, the absorption kinetics of both zeolites follow pseudo-second-order kinetics. Therefore, nonhydrothermally synthesized zeolite is alternative absorbent for dye removal due to its safety, cheap cost, using low cost and widely available precursors, and using easy and safe synthesizing method.

中文翻译：

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两种沸石合成方法去除水溶液中亚甲基蓝的比较研究

工业排放的有机染料由于其毒性和在废水中呈现颜色，对生态系统和人类健康具有显着影响。吸收法具有环保、简单、高效等特点，是一种优于其他废水处理方法的方法。沸石是常用作废水中有机染料吸收剂的多孔材料之一。然而，由于沸石的前驱体和合成方法昂贵（即需要昂贵的高压釜的水热法），沸石的广泛应用受到限制。在这项工作中，使用来自废弃食品包装铝箔的廉价且广泛可用的前体铝和来自甘蔗渣灰的低成本二氧化硅用于合成沸石，无需水热法（ZB），其中水热合成沸石（ZA）用作参考。XRD图谱显示ZB是方钠石八水合物沸石，ZA是沸石林德A型(LTA)。通过 SEM 和 FTIR 研究了两种沸石中键的形态和类型。合成的沸石用作从水溶液中吸收亚甲基蓝 (MB) 的吸收剂。通过使用紫外-可见光谱评估合成沸石的 MB 去除效率。结果表明，ZB 和 ZA 在 40 mg/L 时的吸收容量分别为 3.5 mg/g 和 3.9 mg/g。在 PH 为 7 和吸附剂用量为 0.005 mg/L 时观察到两种沸石的最佳去除效率。对两种沸石的稳定性进行了 3 次测试。方钠石八水沸石和沸石 LTA 的吸收等温线有效地符合 Freundlich 和 Langmuir 模式。此外，两种沸石的吸收动力学都遵循准二级动力学。因此，非水热法合成的沸石因其安全、成本低廉、前驱体成本低且可广泛使用、合成方法简单、安全等优点而成为染料去除的替代吸附剂。