Adsorption of Ce(IV) in nitric acid medium by imidazolium anion exchange resin

N-methylimidazolium functionalized anion exchange resin in NO3-form(RNO3) was prepared and used for adsorption of Ce(IV)in nitric acid medium.The adsorption amount increased with shaking time increasing and the adsorption equilibrium was obtained within 180min.Ce(IV) was partially reduced to Ce(III) and the reduction percent of Ce(IV) increased with shaking time increasing.But RNO3 was morestable than other resins due to the high resistance to oxidation.A little increase of adsorption amount was found with ...     

Adsorption of Ce（Ⅳ） in nitric acid medium by imidazolium anion exchange resin

N-methylimidazolium functionalized anion exchange resin in NO3-form(RNO3) was prepared and used for adsorption of Ce(IV)in nitric acid medium.The adsorption amount increased with shaking time increasing and the adsorption equilibrium was obtained within 180min.Ce(IV) was partially reduced to Ce(III) and the reduction percent of Ce(IV) increased with shaking time increasing.But RNO3 was morestable than other resins due to the high resistance to oxidation.A little increase of adsorption amount was found with concentration of HNO3increasing.However,the reduction percent of Ce(IV) decreased with the increase of HNO3 concentration.The addition of NaNO3 decreasedthe adsorption amount of Ce(IV) on RNO3 due to the competitive anion exchange reaction.Ce(IV) was adsorbed on RNO3 in the form ofCe(IV) anion nitrato-complex.RNO3 and Ce(IV)-loaded RNO3 were characterized by fourier transform infrared(FT-IR) and thermogravimeric analysis(TGA).Ce(IV) could be easily separated from RE(III) solution by RNO3.     

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 依据GB/T 528－2009《硫化橡胶或热塑性橡胶拉伸应力应变性能的测定》,测定了聚氨酯弹性体的拉伸强度,系统地分析了该法测量结果的不确定度来源并对其进行了评定.对拉伸强度测量不确定度进行了分析和量化。当聚氨酯弹性体的拉伸强度为49.2 MPa时,测量结果的扩展不确定度为1.12 MPa。     

聚氨酯泡沫吸附剂的制备及其在金属离子富集/分离方面的应用

聚氨酯泡沫(PUF)具有弹性多孔、泡孔结构可控、形状可调、制备工艺简单、稳定性高、吸附/脱附速率快、易于分离、易于实现在线分离富集和自动化操作等特点,非常适合用作吸附分离材料。近来PUF在富集/分离金属离子方面应用广泛,PUF本身就对金属离子具有一定的吸附能力,但吸附量较低、选择性较差。修饰后的PUF,如物理负载、化学改性和复合PUF,其吸附性能和选择性得到了较大的提高,可实现对水中不同金属离子的吸附分离。重点介绍了不同形式的PUF,包括空白、物理负载、化学改性和复合PUF的制备,及其作为吸附剂对水中金属离子的富集/分离方面的研究进展。     

差示扫描量热法测定相稳定硝酸铵晶变温度的不确定度评定

采用差示扫描量热法(DSC)测定了相稳定硝酸铵的晶变温度,讨论了测定过程中各种随机因素、取样量、仪器和选取不同基线点等因素产生的不确定度分量,计算出了DSC法测定相稳定硝酸铵晶变温度的合成标准不确定度为0.18℃,扩展不确定度为0.36℃.