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| 二氧化锰改性浮萍生物炭吸附水中U(VI)的性能研究 |
| Performance study of manganese dioxide-modified floating pumice biochar for adsorption of U(VI) in water |
| 投稿时间：2025-04-23 修订日期：2025-05-14 |
| DOI： |
| 中文关键词: 浮萍 MBR 铀 吸附 |
| 英文关键词:duckweed MBR U(VI) adsorption |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 以浮萍为原料制备的浮萍生物炭(BR)经二氧化锰改性制得了二氧化锰改性生物炭(MBR)复合材料,探讨了MBR对U(VI)的吸附性能、影响因素和吸附机理。实验结果表明,在pH为5,MBR投加量为 0.2 g/L,吸附时间120 min,初始铀浓度10 mg/L,温度为303 K 条件下,MBR对U(VI)的去除率为92.4%,比BR提高了16.6%。BET分析表明经过改性后,MBR比BR的比表面积提高了9倍,进而提高了材料对U(VI)的吸附效率。MBR对U(VI)的最大吸附量达到389.615 mg/g。吸附过程符合Langmuir等温模型和拟二阶动力学模型,吸附过程是一个自发吸热过程。在经过五次循环后,MBR对U(VI)的去除率为63.77%。 |
| 英文摘要: |
| The composite material of manganese dioxide modified biochar (MBR) was prepared from floating duckweed biochar (BR) modified with manganese dioxide. The adsorption performance, influencing factors, and adsorption mechanism of MBR on U (VI) were investigated. The experimental results showed that under the conditions of pH 5, MBR dosage of 0.2 g/L, adsorption time of 120 min, initial uranium concentration of 10 mg/L, and temperature of 303 K, the removal rate of U (VI) by MBR was 92.4%, which was 16.6% higher than that of BR. BET analysis showed that after modification, the specific surface area of MBR increased by 9 times compared to BR, thereby improving the material"s adsorption efficiency for U (VI). The maximum adsorption capacity of MBR for U (VI) reached 389.615 mg/g. The adsorption process conforms to the Langmuir isotherm model and pseudo second order kinetic model, and is a spontaneous endothermic process. After five cycles, the MBR achieved a removal rate of 63.77% for U (VI). |
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