期刊论文

Preparation of Magnetized Hawaii Nutshell Activated Carbon and its Adsorption Mechanism for U(Ⅵ)

中文

安徽农学通报

1007-7731

2019

25

8

125-130,132

10.16377/j.cnki.issn1007-7731.2019.08.051

51874180:国家自然科学基金 2017SYL05:南华大学双一流建设平台 2018KYY162:南华大学研究生科学基金项目

本校为第一机构

实验选用KOH、Fe3O4纳米粒子制备磁性夏威夷果壳活性炭,并从磁化活性炭(M-AC)的改性机理、除铀(U)机理、最佳使用条件对磁性夏威夷果壳活性炭除U进行分析。结果表明:磁性活性炭在pH为5时对U去除效率最好,反应140 min后达到吸附平衡,最大吸附量为9.63 mg·g^-1,去除率可达94.6%。同时实验制备的M-AC在循环实验5次后对U(Ⅵ)去除率仍能达到91%,具有明显的磁选回收再利用能力。吸附等温模型表明吸附过程为单层吸附和多层吸附并存,热力学分析显示吸附过程属于吸热反应,动力学拟合结果则说明吸附过程以化学吸附为主,物理吸附为辅。SEM-EDS、FT-IR、XPS等表征结果进一步说明,由于M-AC在制备、活化过程中...

In this research, KOH and Fe3 O4 nanoparticles were used to prepare magnetic active carbon from Hawaii nutshell,the modified mechanism of magnetized activated carbon(M-AC),the mechanism of removing uranium and the best use condition were analyzed. The results show that the removal efficiency of u is the best when pH is 5,the adsorption equilibrium is reached after 140 min reaction,the maximum adsorption amount is 9.63 mg·g^-1,the removal rate can reach 94.6%. At the same time,the removal rate of U(Ⅵ)by MAC can reach 91% after 5 cycles,and the...