期刊论文

Xie, S.

中文

环境工程学报

1673-9108

2016

10

3

1126-1132

11175081:国家自然科学基金 11475080:国家自然科学基金 20134324110003:高等学校博士学科点专项科研基金

本校为第一且通讯机构

高温加热可膨胀石墨制得膨胀石墨,用于去除溶液中的U(VI)。通过静态吸附实验,研究了初始pH、吸附剂投加量、U(VI)初始浓度、温度以及吸附时间对膨胀石墨吸附U(VI)效果的影响。实验结果表明,膨胀石墨吸附U(VI)的最佳pH为6.5,在温度为30 ℃,投加量为2.0 g/L,U(VI)初始质量浓度为10 mg/L时,对U(VI)的去除率达到98.08%,反应在4 h达到平衡。Langmuir等温吸附模型和准二级动力学模型较好地拟合了吸附过程,30℃时饱和吸附量为27.03 mg/ g;热力学分析表明,膨胀石墨对U(VI)的吸附是自发的放热反应。比表面积测试、扫描电镜、X射线能谱与傅里叶红外光谱分析结果表明,膨胀石墨对U(VI)的吸附以物理吸附为主,...

Expanded graphite (EG) was prepared from expandable graphite at high temperature and used to adsorb uranium(VI) ions from aqueous solutions. The effects of pH, adsorbent dosage, initial U(VI) ion concentration, temperature, and adsorption time on adsorption of U(VI) were investigated through static adsorption experiments. The results showed that the optimum adsorption occurs at a pH of 6.5 and the adsorption reaches equilibrium within 4 h. Meanwhile, the removal rate was up to 98.08% for an initial U(VI) concentration of 10 mg/L and adsorbent d...