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改性麦饭石对沉积物各形态磷的吸附研究。

Investigation on the adsorption of phosphorus in all fractions from sediment by modified maifanite.

机构信息

State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.

University of Chinese Academy of Sciences, Beijing, 100049, China.

出版信息

Sci Rep. 2018 Oct 23;8(1):15619. doi: 10.1038/s41598-018-34144-w.

DOI:10.1038/s41598-018-34144-w
PMID:30353133
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6199331/
Abstract

Sediment phosphorus (P) removal is crucial for the control of eutrophication, and the in-situ adsorption is an essential technique. In this study, modified maifanite (MMF) prepared by acidification, alkalization, salinization, calcination and combined modifications, respectively, were first applied to treat sediment P. The morphology and microstructure of MMF samples were characterized by X-ray fluorescence (XRF), Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM) and Brunauer-Emmett-Teller (BET). Various adsorption parameters were tested, such as dosage of maifanite, time, operation pH and temperature. The adsorption mechanisms were also investigated and discussed. Results showed that CMMF-H2.5-400 (2.5 mol/L HSO and calcined at 400 °C) exhibited the highest P adsorption capacity. Thus, it was selected as the in-situ adsorbent material to control the internal P loading. Under the optimal conditions of dynamic experiments, the adsorption rates of TP, IP, OP, Fe/Al-P and Ca-P by CMMF-H2.5-400 were 37.22%, 44.41%, 25.54%, 26.09% and 60.34%, respectively. The adsorption mechanisms analysis revealed that the adsorption of P onto CMMF-H2.5-400 mainly by ligand exchange. Results of this work indicated that the modification treatment could improve the adsorption capacity of maifanite, and CMMF-H2.5-400 could be further applied to eutrophication treatment.

摘要

底泥磷（P）去除对于控制富营养化至关重要，原位吸附是一种重要的技术。本研究首次采用酸化、碱化、盐化、煅烧和组合改性制备的改性麦饭石（MMF）处理底泥 P。采用 X 射线荧光（XRF）、傅里叶变换红外（FTIR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）和 Brunauer-Emmett-Teller（BET）对 MMF 样品的形貌和微观结构进行了表征。测试了不同的吸附参数，如麦饭石用量、时间、操作 pH 值和温度。还研究并讨论了吸附机制。结果表明，CMMF-H2.5-400（2.5 mol/L HSO 和在 400°C 下煅烧）具有最高的磷吸附容量。因此，选择它作为原位吸附材料来控制内部磷负荷。在动态实验的最佳条件下，CMMF-H2.5-400 对 TP、IP、OP、Fe/Al-P 和 Ca-P 的吸附率分别为 37.22%、44.41%、25.54%、26.09%和 60.34%。吸附机制分析表明，P 吸附到 CMMF-H2.5-400 上主要通过配体交换。这项工作的结果表明，改性处理可以提高麦饭石的吸附能力，并且 CMMF-H2.5-400 可以进一步应用于富营养化处理。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/5101d9ad8a47/41598_2018_34144_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/708cf373c015/41598_2018_34144_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/824036ce2dd9/41598_2018_34144_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/95a48dfc86cd/41598_2018_34144_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/e91661a2b26d/41598_2018_34144_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/1ac2bd2893c0/41598_2018_34144_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/14f026e066f4/41598_2018_34144_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/5101d9ad8a47/41598_2018_34144_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/708cf373c015/41598_2018_34144_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/824036ce2dd9/41598_2018_34144_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/95a48dfc86cd/41598_2018_34144_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/e91661a2b26d/41598_2018_34144_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/1ac2bd2893c0/41598_2018_34144_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/14f026e066f4/41598_2018_34144_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcb5/6199331/5101d9ad8a47/41598_2018_34144_Fig7_HTML.jpg

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