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通过多步反应制备8-羟基喹啉改性壳聚糖吸附剂(CATT-8-HQ),利用红外光谱仪、热重分析仪分别表征其结构和考察其吸附与解吸铀的性能。结果表明:在pH为4～7范围内,CATT-8-HQ对铀的吸附容量较高;对于铀初始质量浓度为500 mg/L溶液,CATT-8-HQ对铀的吸附容量达123 mg/g(干);以20 g/L Na_2CO_3+60 g/L NaHCO_3作解吸剂可以将铀解吸下来,解吸率超过90%。对于实际含铀吸附尾液,用CATT-8-HQ一次摇床振荡吸附,铀质量浓度可降至0.05 mg/L以下,达到国家废水排放标准。
The 8-hydroxyquinoline-modified chitosan adsorbent (CATT-8-HQ) was prepared by multi-step reaction. The structure of the 8-hydroxyquinoline modified chitosan adsorbent was characterized by infrared spectroscopy and thermogravimetric analysis. The results showed that the adsorption capacity of CATT-8-HQ to uranium was high at the pH range of 4 ~ 7. The adsorption capacity of CATT-8-HQ to uranium was about 123 mg for the initial uranium concentration of 500 mg / L / g (dry); desorption of uranium down to 20 g / L Na_2CO_3 + 60 g / L NaHCO_3 desorption down the desorption rate of more than 90%. For the actual uranium-containing tailings, the concentration of uranium can be reduced to less than 0.05 mg / L with the shaking adsorption of CATT-8-HQ primary shaker, reaching the national wastewater discharge standard.