Using synthetic zeolite from fly ash to treat high concentration phosphorus wastewater does not only improve the utilization of fly ash as solid waste but also reduce the environmental pressure caused by eutrophication. A synthetic zeolite was prepared from coal fly ash by one-step hydrothermal synthesis and applied for phosphorus adsorption from industrial wastewater (∼8,000 mg-P/L), and its adsorption characteristics and performance were studied. The results indicated that the product was a well-crystallized Na-P1 zeolite with typical morphology of plate- and rod-shaped crystals. Compared with the original fly ash, the specific surface area and average pore volume of the synthetic zeolite were nine and six times larger than the fly ash, reaching 43.817 m 2 /g and 0.122 cm 3 /g. The results from phosphorus adsorption onto the synthetic zeolite showed that the synthetic zeolite had good phosphorus adsorption properties. The adsorption process highly conformed to the pseudo-second-order kinetic model with the regression coefficient R 2 of 0.998. Phosphorus adsorption on the synthetic zeolite was fitted to the Langmuir monolayer adsorption model, and the regression coefficient R 2 was 0.989. The maximum phosphorus adsorption capacity was 84.4 mg-P/g-zeolite.

中文翻译：

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粉煤灰合成沸石及其对废水中磷的吸附

用粉煤灰合成沸石处理高浓度含磷废水，不仅提高了粉煤灰作为固废的利用率，而且减轻了富营养化带来的环境压力。以粉煤灰为原料，通过一步水热合成制备了一种合成沸石，用于工业废水中磷的吸附（~8,000 mg-P/L），并对其吸附特性和性能进行了研究。结果表明，产物为结晶良好的Na-P1沸石，具有典型的板状和棒状晶体形态。与原粉煤灰相比，合成沸石的比表面积和平均孔容比粉煤灰大9倍和6倍，分别达到43.817 m 2 /g和0.122 cm 3 /g。磷吸附到合成沸石上的结果表明合成沸石具有良好的磷吸附性能。吸附过程高度符合准二级动力学模型，回归系数R 2 为0.998。合成沸石上的磷吸附符合Langmuir单层吸附模型，回归系数R 2 为0.989。最大磷吸附容量为84.4 mg-P/g-沸石。