稻壳生物炭对稀土元素Ce、Y吸附效果的研究
The Adsorption Study of Rare Earth Element Ce, Y in the Solution on Rice Husk Biochar
DOI: 10.12677/HJCET.2017.75028, PDF, HTML, XML, 下载: 1,615  浏览: 4,444 
作者: 唐 璐, 刘 丹, 程祖琴, 刘 鑫：江西理工大学资源与环境工程学院，江西 赣州；周 丹：江西理工大学资源与环境工程学院，江西 赣州；江西省矿冶环境污染控制重点实验室，江西 赣州
关键词: 稻壳生物炭；稀土元素；吸附；Rice Husk Biochar； Rare Earth Element； Adsorption
摘要: 以稻壳为原料，在550˚C，氮气气氛下热解制备生物炭(RHBC)，通过吸附热力学及动力学实验，考察稻壳生物炭对稀土元素Ce、Y的吸附特性。吸附热力学实验结果表明，RHBC对Ce、Y的吸附行为符合Langmuir模型，对Ce、Y的最大吸附量分别为19.80 mg•kg−1、8.61 mg•kg−1。动力学结果表明，RHBC对Ce、Y的吸附动力学过程符合Lagergren二级动力学模型, 吸附过程倾向于化学吸附。反应体系pH在3~7时，RHBC对Y的吸附效率随着pH的增大而增大，RHBC对Ce的吸附效率受溶液pH影响较小，pH3~7吸附效率均达到96%以上。
Abstract: The rice husk biochar (RHBC) was prepared with rice husk by pyrolysis at 550˚C under nitrogen atmosphere. Adsorption isotherm and kinetics study were investigated to determine the adsorp-tion capacities of rare earth element Ce, Y onto RHBC in solution. The adsorption results showed that the adsorption isotherm of Ce, Y onto rice husk biochar could be well described by Langmuir model, and the maximum adsorption capacities were 19.80 mg•kg−1 of Ce, and 8.61 mg•kg−1 of Y. The kinetics results showed that the adsorption process could be well fitted by Lagergren pseudo-second-order model, for a chemical adsorption process. In addition, in the solution pH range of 3 - 7, the removal rate of Y on RHBC enhanced significantly with the increasing pH, while the solution pH made a negligible effect on the removal rate of Ce onto RHBC, which were higher than 96%.
文章引用：唐璐, 刘丹, 程祖琴, 周丹, 刘鑫. 稻壳生物炭对稀土元素Ce、Y吸附效果的研究[J]. 化学工程与技术, 2017, 7(5): 188-198. https://doi.org/10.12677/HJCET.2017.75028

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