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以木薯淀粉为原料,微波辅助接枝丙烯酸合成了水凝胶(SAH)。采用SEM、FTIR、XPS对SAH进行了表征,考察了SAH对Pb~(2+)的吸附机理;进一步考察了微波功率、pH、吸附温度、吸附时间和Pb~(2+)的初始浓度对吸附的影响。结果表明,SAH具有三维多孔结构,主要通过与Pb~(2+)形成双配位络合物实现对Pb~(2+)的吸附。微波功率为300 W时制备的SAH,在pH为6.09、吸附时间为60 min、Pb~(2+)初始浓度为0.005 mol/L、吸附温度为30℃的条件下,吸附量可达561 mg/g。SAH可重复利用,重复使用4次后其吸附量为458 mg/g。吸附过程符合准二级动力学模型和Langmuir等温吸附模型。
Using tapioca starch as raw material, hydrogel (SAH) was synthesized by microwave assisted grafting of acrylic acid. SAH was characterized by SEM, FTIR and XPS. The adsorption mechanism of SAH on Pb 2+ was investigated. The effects of microwave power, pH, adsorption temperature, adsorption time and the initial concentration of Pb 2+ Adsorption effects. The results show that SAH has a three - dimensional porous structure, which is mainly responsible for the adsorption of Pb2 + by forming a bidentate complex with Pb2 +. When the microwave power was 300 W, the adsorption capacity of SAH was 561 mg under the conditions of pH 6.09, adsorption time 60 min, initial concentration of Pb 2+ 0.005 mol / L and adsorption temperature 30 ℃ / g. SAH reusable, after repeated use of 4 times its adsorption capacity of 458 mg / g. The adsorption process accords with quasi-second-order kinetic model and Langmuir isotherm model.