文献类型：期刊文献

中文题名：稻草生物炭对铕的吸附行为及机理研究

英文题名：Sorption Behaviors and Mechanisms of Eu(Ⅲ) on Rice Straw-derived Biochar

作者：董丽佳[1];吴思颖[1];李生波[1];魏作富[2];杨国[1];胡保卫[1]

机构：[1]绍兴文理学院生命科学学院,绍兴312000;[2]山西师范大学生命科学学院,临汾041004

年份：2020

卷号：35

期号：3

起止页码：390

中文期刊名：无机材料学报

外文期刊名：Journal of Inorganic Materials

收录：CSTPCD、、北大核心2017、Scopus、CSCD2019_2020、北大核心、CSCD

基金：National Natural Science Foundation of China(31700476)。

语种：中文

中文关键词：稻草生物炭;Eu(Ⅲ);吸附行为;吸附机理;光谱技术

外文关键词：rice straw-derived biochar;Eu(Ⅲ);sorption behavior;sorption mechanism;spectroscopic technology

中文摘要：以农业残留物为原料制备的生物炭被广泛应用于去除重金属,这对于环境保护具有双重意义。本研究以稻草为原料制备了生物炭,通过系列静态实验和光谱技术研究其对重金属铕(Eu)的吸附行为及机理。研究发现溶液pH显著影响生物炭对Eu(Ⅲ)的吸附量,但不改变吸附反应时间;腐殖酸/富里酸(HA/FA)在pH<7.0的溶液中能促进生物炭对Eu(Ⅲ)的吸附,而在pH>7.0的溶液中则抑制Eu(Ⅲ)的吸附;吸附过程主要涉及共沉淀或内表面络合机制;该吸附属于化学吸附,且吸附速率受内颗粒扩散过程的限制。此外, Freundlich模型对该吸附拟合最好, Langmuir模型显示稻草生物炭对Eu(Ⅲ)的最大吸附量为40.717 mg/kg,这可能与生物炭的层状结构和丰富的官能团有关;热力学分析表明该吸附是自发的吸热过程。这些发现有利于评估稻草生物炭在去除水中重金属方面潜在的应用价值。

外文摘要：Biochar, derived from agricultural residuals, is extensively applied to remove detrimental heavy metals from wastewater, which has dual significance for the environment protection. Herein, the sorption behavior and interaction mechanism of Eu(Ⅲ) on rice straw-derived biochar was investigated by batch and spectroscopic technologies. The solution pH significantly affects the percentage of the sorption, but has little effect on the contact time. Humic substances(HA/FA) significantly enhance Eu(Ⅲ) sorption with solution pH<7.0, but inhibit the sorption with solution pH>7.0. The sorption mechanism involves co-precipitation or inner-sphere surface complexation. And the chemical sorption rate is restricted by intra-particle diffusion process. Besides, the Freundlich model simulates isotherms best and the maximum sorption amount is up to 40.717 mg/kg, which correlates with the stratified structure and abundant functional groups of biochar. The thermodynamic parameters suggest that the sorption of Eu(Ⅲ) on biochar is a spontaneous and endothermic process. Therefore, these results are valuable to assess the potential application values of rice straw-derived biochar for the removal of Eu(Ⅲ) in water systems.