Alkali-Activated Brick Aggregates as Industrial Valorized Wastes: Synthesis and Properties

IF 2.7 Q1 MATERIALS SCIENCE, CERAMICS Ceramics-Switzerland Pub Date : 2023-08-14 DOI:10.3390/ceramics6030108
A. Boughriet, O. Allahdin, N. Poumaye, Gildas Doyemet, G. Tricot, B. Revel, B. Ouddane, M. Wartel
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Abstract

In recent works, many industrial by-products were employed as solid precursors for the synthesis of alkali-activated binders and as alternatives to Portland cement for the immobilization of hazardous, toxic and nuclear wastes. Among industrial wastes, alkali-activated brick was found to be an interesting porous composite for removing very toxic heavy metals (Pb2+, Cd2+, Co2+) and radio-nuclides (Sr2+, Cs+, Rb+) from aqueous solutions. The starting material is very attractive due to the presence of metakaolinite as a geo-polymer precursor and silica for increasing material permeability and facilitating water filtration. The alkaline reaction gave rise to geo-polymerization followed by partial zeolitization. Elemental surface micro-analysis was performed by Scanning Electron Microscopy (SEM) equipped with an Energy-Dispersive X-ray Spectrometer (EDS). The formation of crystalline phases was corroborated by X-ray diffraction (XRD) analysis. Information about 29Si, 27Al and 1H nuclei environments in crystallized and amorphous aluminosilicates was obtained by 29Si, 27Al and 1H MAS NMR. 27Al–1H dipolar-mediated correlations were investigated by employing dipolar hetero-nuclear multiple quantum coherence (D-HMQC) NMR, highlighting Al–O–H bonds in bridging hydroxyl groups (Si–OH–Al) that are at the origin of adsorptive properties. Aqueous structural stability and cationic immobilization characteristics before and after material calcination were investigated from acid-leaching experiments.
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碱活性砖骨料的合成与性能研究
在最近的工作中,许多工业副产品被用作合成碱活化粘合剂的固体前体,并作为波特兰水泥的替代品,用于固定危险、有毒和核废料。在工业废水中,碱活化砖被发现是一种有趣的多孔复合材料,用于去除水溶液中的毒性重金属(Pb2+, Cd2+, Co2+)和放射性核素(Sr2+, Cs+, Rb+)。由于偏高岭石作为土工聚合物前驱体和二氧化硅的存在,该起始材料非常有吸引力,以增加材料的渗透性和促进水过滤。碱性反应引起地聚反应,随后发生部分沸石化反应。采用扫描电子显微镜(SEM)和能谱仪(EDS)对元素表面进行了微观分析。通过x射线衍射(XRD)分析证实了结晶相的形成。通过29Si、27Al和1H MAS NMR获得了结晶和非晶硅铝酸盐中29Si、27Al和1H核环境的信息。利用偶极异核多重量子相干(D-HMQC) NMR研究了27Al-1H偶极介导的相关性,突出了桥接羟基(Si-OH-Al)上的Al-O-H键是吸附性质的起源。通过酸浸实验研究了材料煅烧前后的水结构稳定性和阳离子固定化特性。
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来源期刊
CiteScore
3.00
自引率
7.10%
发文量
66
审稿时长
10 weeks
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