功能化水葫芦生物吸附剂的制备及其对铀的吸附机理 |
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引用本文: | 杨军,喻清,张攀,李照鹏,吕翔,江婷婷,戚燚林,熊远海. 功能化水葫芦生物吸附剂的制备及其对铀的吸附机理[J]. 南华大学学报(自然科学版), 2021, 35(3): 7-16 |
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作者姓名: | 杨军 喻清 张攀 李照鹏 吕翔 江婷婷 戚燚林 熊远海 |
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作者单位: | 西安中核蓝天铀业有限公司,陕西 西安710500;南华大学 资源环境与安全工程学院,湖南 衡阳421001;华中科技大学 环境科学与工程学院,湖北 武汉430074;中南大学 资源与安全工程学院,湖南 长沙410083 |
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基金项目: | 国家自然科学基金资助项目(51804164;51774187);湖南省教育厅资助项目(18B276;18B266;18A247;17A184);湖南省大学生研究性学习和创新性实验计划项目(20202799);金属矿山安全与健康国家重点实验室开放课题(zdsys2018-007);南华大学大学生研究性学习和创新性实验计划项目(201412;201422;201501);湖南省高新技术产业科技创新引领计划(科技攻关类)项目(2020SK2024) |
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摘 要: | 采用氢氧化钠预处理—柠檬酸热改性的两阶段处理方法,对水葫芦(water hyacinth,WH)通过酯化反应引入外来羧基,制备成一种新型的功能化水葫芦生物吸附剂(modified water hyacinth,MWH).利用批次静态吸附实验,研究了pH、铀初始质量浓度、WH/MWH投加量、吸附时间等因素对WH/MWH吸...
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关 键 词: | 水葫芦 柠檬酸 热改性 铀 |
收稿时间: | 2020-12-25 |
Preparation of Functional Water Hyacinth Biological Adsorbent and its Adsorption Mechanism for Uranium |
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Abstract: | The modified Water Hyacinth MWH was prepared by sodium hydroxide pretreatment and thermal modification with citric acid. The effects of pH, initial uranium concentration, WH/MWH dosage, adsorption time and other factors on the adsorption of uranium by WH/MWH were studied by batch static adsorption experiment. The mechanism of WH/MWH adsorption of uranium-containing wastewater was studied by SEM, EDS, FTIR characterization and adsorption kinetics. The results showed that when the initial concentration of uranium-containing wastewater was 1 mg/L, the pH value of the solution was 7, the dosage of WH /MWH was 0.2 g/L and the adsorption time was 4 hours, the adsorption equilibrium was reached, and the maximum adsorption capacity was 4.06 mg/g. Compared with WH, the adsorption rate of MWH to uranium increased by 34.03%, and the adsorption capacity increased by 1.7 mg/g. The uranium adsorption process of MWH is more in line with the quasi-second-order kinetic model, indicating that adsorption of uranium-containing wastewater with MWH is mainly chemical adsorption, accompanied with surface adsorption and ion exchange. |
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Keywords: | water hyacinth citricacid thermal modification uranium |
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