| 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,(3):7~16.[YANG Jun,YU Qing,ZHANG Pan,LI Zhaopeng,Lü Xiang,JIANG Tingting,QI Yilin,XIONG Yuanhai.Preparation of Functional Water Hyacinth Biological Adsorbent and its Adsorption Mechanism for Uranium[J].Journal of University of South China(Science and Technology),2021,(3):7~16.] |
| 功能化水葫芦生物吸附剂的制备及其对铀的吸附机理 |
| Preparation of Functional Water Hyacinth Biological Adsorbent and its Adsorption Mechanism for Uranium |
| 投稿时间：2020-12-25 |
| DOI： |
| 中文关键词: 水葫芦 柠檬酸 热改性 铀 |
| 英文关键词:water hyacinth citricacid thermal modification uranium |
| 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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| 中文摘要: |
| 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吸附铀的影响,通过SEM、EDS、FTIR表征手段以及吸附动力学,研究了WH/MWH吸附含铀废水的机理。结果表明:当含铀废水溶液初始质量浓度为1 mg/L、溶液pH=7、WH/MWH的投加量为0.2 g/L、吸附时间4 h时即达到吸附平衡,最大吸附容量为4.06 mg/g,较WH而言,MWH对铀的吸附率提高了34.03%,吸附容量提高了1.7 mg/g。MWH吸附铀的过程更符合准二级动力学模型,说明MWH吸附含铀废水主要是以化学吸附为主,同时伴随表面吸附以及离子交换作用。 |
| 英文摘要: |
| 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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