Amino-functionalized magnetic nanoparticle （NH2-MNP） were prepared by a sol-gel approach. The adsorption behavior of Cu（II） ions on NH2-MNP was discussed systematically by batch experiments. The effects of initial...
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Amino-functionalized magnetic nanoparticle （NH2-MNP） were prepared by a sol-gel approach. The adsorption behavior of Cu（II） ions on NH2-MNP was discussed systematically by batch experiments. The effects of initial Cu（II） ions concentration, time, pH and temperature were investigated. In kinetic studies, the pseudo-second-order model was successfully employed, and the pseudo-first-order model substantiated that Cu（II） adsorption on NH2-MNP was a diffusion-based process. Langmuir model and Dubinin-Radushkevich model （R2〉0.99） were more corresponded with the adsorption isotherm data of Cu（II） ions than Freundlich model. The adsorption capacity was increased with the increment of temperature and pH. NH2-MNP remains excellent Cu（II） recoveries after reusing five adsorption and desorption cycles, making NH2-MNP a promising candidate for repetitively removing heavy metal ions from environmental water samples. According to the results obtained from adsorption activation energy and thermodynamic studies, it can be inferred that the main adsorption mechanism between absorbent and Cu（II） ions is ion exchange-surface complexation.
目的建立高效液相色谱法测定奥沙利铂原料药中杂质草酸(杂质A)的含量。方法以CAPCELL PAK C18柱(AQ 5μm 4.6mmI.D.×250mm)作为分析柱;采用磷酸缓冲液(40%氢氧化四丁基铵溶液适量,用H3PO4调节pH=6.00)-乙腈(80∶20)为流动相,流速2m...
详细信息
目的建立高效液相色谱法测定奥沙利铂原料药中杂质草酸(杂质A)的含量。方法以CAPCELL PAK C18柱(AQ 5μm 4.6mmI.D.×250mm)作为分析柱;采用磷酸缓冲液(40%氢氧化四丁基铵溶液适量,用H3PO4调节pH=6.00)-乙腈(80∶20)为流动相,流速2mL·min-1,柱温40℃,紫外检测波长205nm。结果杂质A在浓度为0.36～3.6μg·mL-1的范围线性关系良好(r=0.9991),定量限(S/N=10)和检测限(S/N=3)分别为1.45μg·mL-1和0.36μg·mL-1。结论本测定方法简单,准确,可以用于奥沙利铂原料药中杂质A的测定。
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