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采用γ-氨丙基三乙氧基硅烷化学修饰活化后的硅胶,以戊二醛为交联剂,接上羧甲基壳聚糖,继而接枝上β-环糊精作为功能单体,制备了一种用于分离富集水样中Cu(Ⅱ)的固相萃取新材料。利用红外光谱(FT-IR)、比表面分析(BET)、X射线衍射光谱(XRD)以及热重分析(TG)等方法对吸附剂进行结构表征。采用火焰原子吸收(FAAS)作为检测手段,考察了溶液p H、振荡时间、吸附剂用量、样品流速、洗脱液浓度和体积等对吸附剂吸附Cu(Ⅱ)的影响。吸附剂饱和吸附容量为9.37 mg/g,最大富集倍数高达350。吸附过程能用准二级动力学模型和Langmuir等温吸附方程进行很好的拟合。应用于环境水样中Cu(Ⅱ)的分离富集与测定,回收率在96.8%~105.2%之间,效果较好。
Activated silica gel was chemically modified by γ-aminopropyltriethoxysilane, carboxymethyl chitosan was linked with glutaraldehyde as cross-linking agent, then β-cyclodextrin was grafted as functional monomer, A new solid-phase extraction material was prepared for the separation and enrichment of Cu (Ⅱ) in water samples. The structure of the adsorbent was characterized by FT-IR, BET, XRD and TG. Flame atomic absorption spectrometry (FAAS) was used as a detection method to investigate the effects of pH, pH, concentration of adsorbent, sample flow rate, eluent concentration and volume on the adsorption of Cu (Ⅱ) on the adsorbent. Adsorbent saturated adsorption capacity of 9.37 mg / g, the maximum enrichment factor of up to 350. Adsorption process can be quasi-second-order kinetic model and Langmuir isotherm equation for a good fit. It can be used in the separation, enrichment and determination of Cu (Ⅱ) in environmental water samples. The recoveries are between 96.8% and 105.2%.