Removal of uranium(VI) from aqueous solutions by new phosphorus-containing carbon spheres synthesized via one-step hydrothermal carbonization of glucose in the presence of phosphoric acid
Removal of uranium(VI) from aqueous solutions by new phosphorus-containing carbon spheres synthesized via one-step hydrothermal carbonization of glucose in the presence of phosphoric acid
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DOI：
10.1007/s10967-013-2830-2
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发表时间：
2014-03
影响因子：
1.6
通讯作者：
Zhi-Bin Zhang;Zhi-wei Zhou;Xiaohong Cao;Yunhai Liu;G. Xiong;P. Liang
中科院分区：
文献类型：
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作者：
Zhi-Bin Zhang;Zhi-wei Zhou;Xiaohong Cao;Yunhai Liu;G. Xiong;P. Liang
以葡萄糖为原料，在磷酸存在下，通过一步水热碳化法合成了新型富磷水热碳球（HCS-PO 4）。采用Boehm滴定法、扫描电镜和傅里叶变换红外光谱仪对样品的织构和表面化学性质进行了表征。通过磷酸基团修饰，HCS表面上的含氧官能团的含量从0.053增加到1.009 mmol g− 1。研究了HCS_3-PO_4对铀的吸附性能。吸附动力学数据符合准二级动力学方程。吸附过程符合Langmuir等温式，改性后的HCSs吸附容量从80.00 mg g− 1增加到285.70 mg g− 1。热力学参数表明吸附过程是可行的、吸热的、自发的。选择性吸附研究表明，HCSs-PO 4对U（VI）具有选择性吸附作用，Na（I）、Ni（II）、Sr（II）、Mn（II）、Mg（II）和Zn（II）共存时，HCSs-PO 4对U（VI）的选择性系数均有所提高。12.0 g HCS-PO_4对1.0 L含15.0 mg U（VI）离子的工业废水中U（VI）的去除率可达99.9%。
The novel phosphorus-rich hydrothermal carbon spheres (HCSs–PO4) have been synthesized via one-step hydrothermal carbonization of glucose in the presence of phosphoric acid. The textural and surface chemistry properties were characterized using Boehm titrations, scanning electron microscopy and Fourier transform infrared spectrometer. The content of oxygen-containing functional groups on the surface of HCSs increased from 0.053 to 1.009 mmol g−1by phosphate group modification. The adsorption ability of HCSs–PO4has been explored for the removal of uranium from aqueous solutions. The adsorption kinetic data were best described by the pseudo-second-order equation. Adsorption process could be well defined by the Langmuir isotherm, the adsorption capacity of HCSs increased from 80.00 to 285.70 mg g−1after phosphate group modification. And thermodynamic parameters indicated the adsorption process was feasible,endothermic and spontaneous. Selective adsorption studies showed that the HCSs–PO4could selectively remove U(VI), and the selectivity coefficients had been improved in the presence of co-existing ions, Na(I), Ni(II), Sr(II), Mn(II), Mg(II) and Zn(II). Complete removal (99.9 %) of U(VI) from 1.0 L industry wastewater containing 15.0 mg U(VI) ions was possible with 12.0 g HCSs–PO4.