中文摘要：

用Mannich反应将1-（2-吡啶偶氮）-2-萘酚（PAN）接枝到纳米SiO2表面,合成了一种新型吸附剂Nano-SiO2-PAN.通过红外光谱（FT-IR）、扫描电镜（SEM）、热重（TG）、氮气吸附-脱附（BET）等方法对吸附剂进行了表征,并考察了溶液pH、吸附剂用量、搅拌时间、温度、溶液体积等因素对Cu2＋吸附率的影响.系列吸附实验表明,在体系pH为9.2,吸附剂用量为60mg,搅拌时间为30min,吸附温度为31℃条件下,吸附效果最好,富集倍数为56,吸附剂的最大吸附容量为24.87mg.g-1.吸附的Cu2＋用6mol.L-1的盐酸洗脱,洗脱率达96.72%.

英文摘要：

A nano-SiOz solid sorbent is synthesized by attachment of chelating ligand 1-（2-pyridylazo）-2- naphthol to the modified nano-SiO2 surface based on Mannich reaction. The application of modified nano- SiO2 sorbent for the preconcentration of trace Cu2＋ is studied. The optimum condition of the adsorption experiment such as effect of pH, sample volumes, shaking time, elution conditions and effects of interfering ions, concentration factor are investigated. The adsorption capacity of nano-SiO2-PAN is found to be 24.87 mg,g-1. At pH=-9.2, the adsorption equilibrium of Cu2＋ on 60 mg nanometer SiO2- PAN sorbent is achieved within 30 min at temperature of 31 ℃. Adsorbed Cu2＋ is easily eluted with 6 mol,L-1 hydrochloric acid. The maximum preconcentration factor has been found to be 56. The method is expected to apply for the preconcentration of trace amounts of Cu2＋ before spectrometry determination.