School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing, 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing, 210044, China; Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing, 210044, China.
School of Applied Meteorology, Nanjing University of Information Science &Technology, Nanjing, 210044, China.
J Environ Manage. 2022 Mar 1;305:114404. doi: 10.1016/j.jenvman.2021.114404. Epub 2022 Jan 3.
Removal of nutrients in water is crucial to control eutrophication. Fly ash has been increasingly used to synthesize zeolite to remove nutrients, but it is still poorly understood about the removal capacity of zeolite synthesized from coal gasification slag (CGS), which has not been well recycled in many countries. In this study, the CGS was acid leached, alkali dissolved, and synthesized to carbon/zeolite composite (C/ZC) under induction by medical stone. After being modified by ferric sulfate, the composite was analyzed for the adsorption of NH and PO. Results showed that the maximum adsorption capacity by C/ZC is 5.17 mg/g, but C/ZC has no adsorption capacity of PO. The ferric sulfate was used to modify C/ZC to obtain carbon/zeolite composite modified by iron (M-C/ZC). M-C/ZC has a higher specific surface area (348.3 m/g), and the negatively charge of M-C/ZC can adsorb NH and form Fe-O-P between PO and Fe-OH bonds. The maximum adsorption capacity of NH and PO by M-C/ZC are 7.44 mg/g and 6.94 mg/g, respectively. The removal efficiency of NH and PO are up to 88% and 99% under initial NH (5 mg/L) and PO (10 mg/L) concentration. The regeneration capacity of M-C/ZC of NH was stronger than that of PO. After three cycles, the regeneration rate of M-C/ZC of NH was still up to 76.96%. Our findings suggest the good application potential of M-C/ZC for removing NH and PO from wastewater.
去除水中的营养物质对于控制富营养化至关重要。粉煤灰已被越来越多地用于合成沸石来去除营养物质，但对于煤气化渣（CGS）合成的沸石的去除能力仍了解甚少，而在许多国家，CGS 尚未得到很好的回收利用。在本研究中，CGS 经过酸浸、碱溶解，并在医用石的诱导下合成了碳/沸石复合材料（C/ZC）。经硫酸铁改性后，对复合材料进行了 NH 和 PO 的吸附分析。结果表明，C/ZC 的最大吸附容量为 5.17mg/g，但 C/ZC 对 PO 没有吸附能力。用硫酸铁对 C/ZC 进行改性，得到了铁改性的碳/沸石复合材料（M-C/ZC）。M-C/ZC 的比表面积（348.3m/g）更高，M-C/ZC 的负电荷可以吸附 NH 并在 PO 和 Fe-OH 键之间形成 Fe-O-P。M-C/ZC 对 NH 和 PO 的最大吸附容量分别为 7.44mg/g 和 6.94mg/g。在初始 NH（5mg/L）和 PO（10mg/L）浓度下，NH 和 PO 的去除效率分别高达 88%和 99%。M-C/ZC 对 NH 的再生能力强于对 PO 的再生能力。经过三次循环，M-C/ZC 对 NH 的再生率仍高达 76.96%。我们的研究结果表明，M-C/ZC 具有良好的应用潜力，可用于去除废水中的 NH 和 PO。
