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Effects of Aluminum Dosage on Gel Formation and Heavy Metal Immobilization in Alkali-Activated Municipal Solid Waste Incineration Fly Ash
Energy & Fuels ( IF 5.3 ) Pub Date : 2020-03-18 , DOI: 10.1021/acs.energyfuels.9b04493
Xiang Tian 1, 2 , Feng Rao 1, 2 , Ricardo Morales-Estrella 2 , Shaoxian Song 3
Affiliation  

This work attempts to investigate the effects of aluminum dosage on the immobilization of heavy metals in alkali-activated municipal solid waste incineration fly ash-based pastes to manage hazardous threats in it. A variable proportion of metakaolin is used to achieve different aluminum dosages in the synthesized pastes. Structure, composition, morphology, and mechanical property of the prepared pastes are studied by employing X-ray diffraction, 29Si NMR, scanning electron microscopy, and compressive strength measurements. The results showed that a 5% metakaolin-composed paste exhibited the highest compressive strength (10.94 MPa). The addition of the aluminum dosage-converted soluble chloride salt into Friedel’s salt, subsequently, improved the immobilization of heavy metals. The toxic characteristic leaching procedure test showed that a small amount of aluminum can improve immobilization dominantly because of the effective encapsulation ability of the pastes. The molecular modeling and simulation analysis illustrated that because of the presence of Na+ in it, sodium–alumino–silicate–hydrate (N–A–S–H) gel possesses the most stable molecular orientation.

中文翻译:

铝剂量对碱活化城市生活垃圾焚烧粉煤灰凝胶形成和重金属固定化的影响

这项工作试图研究铝的添加量对碱活化城市固体废物焚烧粉煤灰基糊料中重金属固定化的影响,以控制其中的危险性。变比例的偏高岭土用于在合成浆料中获得不同的铝剂量。通过使用X射线衍射研究制备的糊的结构,组成,形态和机械性能29Si NMR,扫描电子显微镜和抗压强度测量。结果表明,由5%偏高岭土组成的糊剂表现出最高的抗压强度(10.94MPa)。随后,将铝剂量转换的可溶性氯化物盐添加到弗里德尔盐中,可以改善重金属的固定性。毒性特征浸出程序测试表明,由于糊剂的有效包封能力,少量的铝可以显着提高固定性。分子建模和模拟分析表明,由于其中存在Na +,钠-铝-硅酸盐-水合物(N–A–S–H)凝胶具有最稳定的分子取向。
更新日期:2020-04-23
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