使用戊二醛为交联剂,将黑荆树单宁(BWT)固化在胶原纤维(CF)表面,得到新型硼同位素分离树脂CF-BWT。通过FTIR、XPS、SEM、^(11)B MAS NMR分析,探究了CF-BWT吸附硼前后表面元素组成、形貌结构以及吸附机理等。研究结果表明,当pH为8.0,硼...使用戊二醛为交联剂,将黑荆树单宁(BWT)固化在胶原纤维(CF)表面,得到新型硼同位素分离树脂CF-BWT。通过FTIR、XPS、SEM、^(11)B MAS NMR分析,探究了CF-BWT吸附硼前后表面元素组成、形貌结构以及吸附机理等。研究结果表明,当pH为8.0,硼初始浓度为110mg/L时,CF-BWT的平衡吸附量可达1.9mg/g。吸附平衡符合Langmuir模型,平衡吸附量随温度升高而增加。吸附动力学可用准二级动力学模型描述,由模型计算得到的平衡吸附量与实验值接近。进一步研究发现,CF-BWT表面固化的黑荆树单宁与硼形成硼-单宁活性交换界面,促使^(10)B和^(11)B发生同位素交换反应,从而将^(10)B富集于CF-BWT表面,实现^(10)B和^(11)B的分离。当pH为7.0时,CF-BWT对^(10)B和^(11)B的单级分离因子可达1.17。当初始硼同位素丰度比(^(10)B/^(11)B)为0.2180时,以CF-BWT为填料的固定床对^(10)B和^(11)B进行分离,发现穿透段硼同位素丰度比(^(10)B/^(11)B)为0.2149,而在洗脱段则达到0.2234。展开更多
A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d H...A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d Hg（Ⅱ） were 39.9 mg·g-1 and 75.2 mg·g-1 respectively at 303 K when the equilibrium concentrations of Pb（Ⅱ） and Hg（Ⅱ） were 192.1 mg·L-1 and 23.5 mg·L-1.Higher temperature led to higher ad sorption capacity. The adsorption isotherm of Pb（Ⅱ） on the tannin immobi lized membrane could be described by the Langmuir model, however, the isotherms of Hg（Ⅱ） tended to be fitted by the Freundlich model. The data of adsorp tion rate could be well described by the pseudo-second-order rate model. Cont inuous adsorption experiments indicated that multi-layer membranes were efficie nt for the removal of Pb（Ⅱ） and Hg（Ⅱ） from water. The membrane wa s easy to be regenerated by 0.1 mol·L-1 HNO3 after continuous adsorpti on and no considerable change of its adsorption property was observed after adso rption and desorption cycles.展开更多
文摘使用戊二醛为交联剂,将黑荆树单宁(BWT)固化在胶原纤维(CF)表面,得到新型硼同位素分离树脂CF-BWT。通过FTIR、XPS、SEM、^(11)B MAS NMR分析,探究了CF-BWT吸附硼前后表面元素组成、形貌结构以及吸附机理等。研究结果表明,当pH为8.0,硼初始浓度为110mg/L时,CF-BWT的平衡吸附量可达1.9mg/g。吸附平衡符合Langmuir模型,平衡吸附量随温度升高而增加。吸附动力学可用准二级动力学模型描述,由模型计算得到的平衡吸附量与实验值接近。进一步研究发现,CF-BWT表面固化的黑荆树单宁与硼形成硼-单宁活性交换界面,促使^(10)B和^(11)B发生同位素交换反应,从而将^(10)B富集于CF-BWT表面,实现^(10)B和^(11)B的分离。当pH为7.0时,CF-BWT对^(10)B和^(11)B的单级分离因子可达1.17。当初始硼同位素丰度比(^(10)B/^(11)B)为0.2180时,以CF-BWT为填料的固定床对^(10)B和^(11)B进行分离,发现穿透段硼同位素丰度比(^(10)B/^(11)B)为0.2149,而在洗脱段则达到0.2234。
文摘A novel adsorption membrane with excellent physical prop erties was prepared by immobilizing bayberry tannin onto hide collagen fiber mem brane. The equilibrium adsorption capacities of the membrane to Pb（Ⅱ） an d Hg（Ⅱ） were 39.9 mg·g-1 and 75.2 mg·g-1 respectively at 303 K when the equilibrium concentrations of Pb（Ⅱ） and Hg（Ⅱ） were 192.1 mg·L-1 and 23.5 mg·L-1.Higher temperature led to higher ad sorption capacity. The adsorption isotherm of Pb（Ⅱ） on the tannin immobi lized membrane could be described by the Langmuir model, however, the isotherms of Hg（Ⅱ） tended to be fitted by the Freundlich model. The data of adsorp tion rate could be well described by the pseudo-second-order rate model. Cont inuous adsorption experiments indicated that multi-layer membranes were efficie nt for the removal of Pb（Ⅱ） and Hg（Ⅱ） from water. The membrane wa s easy to be regenerated by 0.1 mol·L-1 HNO3 after continuous adsorpti on and no considerable change of its adsorption property was observed after adso rption and desorption cycles.
