期刊论文

Adsorption of Thorium(Ⅳ) from Aqueous Solution Using Lemna minor Modified by Citric Acid

中文

环境科学与技术

1003-6504

2018

41

11

100-104

10.19672/j.cnki.1003-6504.2018.11.015

15c0985:湖南省教育厅科学研究项目

本校为其他机构

以浮萍粉、柠檬酸和NaOH为原料,通过酯化反应制备新型吸附材料,并研究了柠檬酸改性浮萍吸附钍（Ⅳ）的行为特性、吸附模型及吸附机理。以柠檬酸对浮萍进行化学改性,将浮萍细胞壁表面的羟基与柠檬酸酯化进行接枝,能更有效地吸附钍离子。结果表明:p H是影响吸附的最主要因素,常温常压下,溶液pH 5.0,吸附剂0.03 g,反应60 min,钍（Ⅳ）初始浓度100 mg/L,最大吸附率97.49%,对应吸附量为162.5 mg/g,吸附量比未经处理的浮萍（最优吸附条件下,吸附量为22.8 mg/g）吸附要大。吸附过程能很好地用准二级反应动力学来解释,通过Langmuir、Freundlich、Temkin 3种等温吸附模型对数据进行拟合,Langmuir模型能更...

The objective of the laboratory experiment is to test the adsorption of thorium (Ⅳ) from water by a new adsorbent prepared with raw materials including dried powder of duckweed (Lemna minor) and citric acid. To prepare the adsorbent duckweed has to be modified by citric acid undergoing the esterification reaction, in which the hydroxy on duckweed cellwall is grafted with citric acid. The experiment of Th(Ⅳ) adsorption suggests that the main parameter that influences the ad- sorption in pH value, and Th(Ⅳ) adsorption rate can reach up to a ma...