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首页> 美国卫生研究院文献>Materials >Synthesis and Characterization of Zeolites Produced from Low-Quality Coal Fly Ash and Wet Flue Gas Desulphurization Wastewater
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Synthesis and Characterization of Zeolites Produced from Low-Quality Coal Fly Ash and Wet Flue Gas Desulphurization Wastewater

机译：低质量煤粉煤灰和湿烟气脱硫废水中沸石的合成与表征

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摘要

This study investigated a low-energy-consuming procedure for the synthesis of zeolite materials from coal fly ash (CFA). Materials containing zeolite phases, namely Na–X, Na–P1, and zeolite A, were produced from F–class fly ash, using NaOH dissolved in distilled water or in wastewater obtained from the wet flue gas desulphurization process, under atmospheric pressure at a temperature below 70 °C. The influence of temperature, exposure time, and alkaline solution concentration on the synthesized materials was tested. In addition, chemical, mineralogical, and textural properties of the obtained materials were determined by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and cation exchange capacity (CEC). Cd(II), Ni(II), NH4+ cation, and Se(VI) anion sorption experiments were conducted to compare the sorption properties of the produced synthetic zeolites with those of the commercially available ones. Zeolitization resulted in an increase of CEC (up to 30 meq/100 g) compared to raw CFA and enhanced the ability of the material to adsorb the chosen ions. The obtained synthetic zeolites showed comparable or greater sorption properties than natural clinoptilolite and synthetic Na–P1. They were also capable of simultaneously removing cationic and anionic compounds. The structural, morphological, and textural properties of the final product indicated that it could potentially be used as an adsorbent for various types of environmental pollutants.
机译：本研究研究了从煤粉煤灰（CFA）合成沸石材料的低耗电程序。含有沸石相的材料，即Na-X，Na-P1和沸石A，由F级粉煤灰制备，使用NaOH溶解在蒸馏水中或从湿烟气脱硫过程中获得的废水，在大气压下温度低于70°C。测试了温度，暴露时间和碱性溶液浓度对合成材料的影响。另外，所得材料的化学，矿物学和纹理性质通过X射线衍射（XRD），X射线荧光（XRF），扫描电子显微镜（SEM）和阳离子交换能力（CEC）测定。进行CD（II），Ni（II），NH 4 +阳离子和SE（VI）阴离子吸附实验，以比较生产的合成沸石与市售的沸石的吸附性能。与原始CFA相比，氮化产生的CEC（最多30meq / 100g）增加，并增强了材料吸附所选离子的能力。所得合成沸石表现出比天然曲氮石和合成Na-P1相当或更高的吸附性。它们还能够同时去除阳离子和阴离子化合物。最终产品的结构，形态学和纹理性质表明它可能被用作各种环境污染物的吸附剂。

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