School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing, People's Republic of China.
School of Environmental Science & Engineering, Southern University of Science & Technology, Shenzhen, People's Republic of China.
Environ Technol. 2020 Jun;41(14):1753-1765. doi: 10.1080/09593330.2018.1545805. Epub 2018 Nov 30.
This work is focused on crystal phase transition of solid wastes and functional application of crystal analcime in waste water purification, which provide a new environment-friendly route. In this paper, analcime was synthesized from steel slag and Circulating fluidized bed combustion (CFBC) fly ash (CFA) by hydrothermal method enhanced via geopolymerization (non-crystallized process). Then the analcimes were used for the removal of heavy metal ions (Pb, Cu) in aqueous solutions. Both the raw materials and products were characterized by XRF, XRD, FT-IR, SEM-EDS, and TEM. The results showed that non-crystallized process reduced the time of hydrothermal reaction and promoted the purity of analcime. The adsorption kinetics of analcime were all well fitted the pseudo-second-order model, and adsorption isotherms were well described by the Langmuir model. The maximum adsorption capacity of analcime for Pb and Cu were around 75.76, and 21.83 mg/g, respectively. The preference order observed for adsorption is Pb > Cu.
这项工作专注于固体废物的晶体相变和沸石在废水净化中的功能应用，为环保提供了一条新途径。本文采用水热法合成沸石，通过地质聚合作用（非晶化过程）增强，原料为钢渣和循环流化床燃烧（CFBC）飞灰（CFA）。然后，用沸石去除水溶液中的重金属离子（Pb、Cu）。对原材料和产品进行了 XRF、XRD、FT-IR、SEM-EDS 和 TEM 分析。结果表明，非晶化过程缩短了水热反应的时间，提高了沸石的纯度。沸石的吸附动力学均很好地符合准二级模型，吸附等温线很好地符合朗缪尔模型。沸石对 Pb 和 Cu 的最大吸附容量分别约为 75.76 和 21.83mg/g。吸附的优先顺序为 Pb > Cu。
