• 关键词：改性膨润土  吸附  沉积物各形态磷  富营养化  杭州西湖

• 基金项目：国家自然科学基金（No.51709254）；中国科学院知识创新工程青年人才领域前沿项目

• 刘子森
• 1. 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072;2. 中国科学院大学, 北京 100049

• 张义
• 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072

• 贺锋
• 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072

• 刘碧云
• 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072

• 周巧红
• 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072

• 蔺庆伟
• 1. 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072;2. 中国科学院大学, 北京 100049

• 曾磊
• 1. 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072;2. 中国科学院大学, 北京 100049

• 吴振斌
• 中国科学院水生生物研究所 淡水生态和生物技术国家重点实验室, 武汉 430072

• 摘要：通过盐酸、碳酸钠、高温焙烧及复合改性等多种改性方法对膨润土进行改性，并借助扫描电子显微镜、傅里叶红外光谱仪及X射线衍射仪等仪器对其进行表征，探讨最佳的改性方法.结果表明，10%碳酸钠+450 ℃高温焙烧复合改性膨润土（Modified bentonite，MB）为最佳改性用土.对比改性前后膨润土颗粒对沉积物各形态磷吸附性能，发现MB颗粒对沉积物磷吸附性能优于膨润土原土（raw bentonite，RB）颗粒.在最佳动态吸附条件下，RB对沉积物TP、OP、IP、Fe/Al-P和Ca-P的吸附率分别为32.5%、25.4%、52.6%、34.6%和12.4%；MB对沉积物TP、OP、IP、Fe/Al-P和Ca-P的吸附率分别为35.5%、29.1%、54.5%、44.6%和10.7%.静态吸附实验结果表明：RB颗粒和MB颗粒在静态吸附时间为28 d时，对沉积物TP的吸附量分别为828.2 mg·kg^-1和977.2 mg·kg^-1，相应的吸附率分别为58.2%和68.6%.MB对沉积物磷的吸附性能较好，可进一步用于富营养化湖泊沉积物磷控制.

• Abstract：Modified bentonite (MB) particles were prepared by acidification, natrification, calcination, and combined modification methods, and evaluated as effective in-situ adsorption materials to remove sediment phosphorus (P) in all fractions. The morphology and microstructure of MB were characterized by scanning electron microscope (SEM), X-ray fluorescence (XRF), Fourier transform infrared (FTIR), X-ray diffraction (XRD) and the Brunauer-Emmett-Teller (BET) surface area measurement. Results showed that the MB treated with 10% (g/g) Na₂CO₃ and calcined at 450℃ exhibited the highest P removal capacity. The performance of MB particles was better than that of raw bentonite (RB) particles in the adsorption of sediment P in the West Lake, Hangzhou, China. Under the optimal stirring conditions, the adsorption rates of sediment TP, OP, IP, Fe/Al-P and Ca-P by MB were 35.5%, 29.1%, 54.5%, 44.6% and 10.7%, respectively. On the other hand, the adsorption rates of sediment TP, OP, IP, Fe/Al-P and Ca-P by RB were 32.5%, 25.4%, 52.6%, 34.6% and 12.4%, respectively. The results of static experiment showed that the optimal adsorption time of both MB and RB particles were 28 days. The adsorption quantities of sediment TP by RB and MB were 828.2 mg·kg^-1 and 977.2 mg·kg^-1, while the corresponding adsorption rates were 58.2% and 68.6%, respectively. The results indicate that the modification has enhanced the P adsorption capacity of bentonite, and the MB particles could be further applied to control and reduce sediment P in eutrophication remediation.

• Key words：modified bentonite (MB)  adsorption  sediment P in all fractions  eutrophication  West Lake, Hangzhou

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