The adsorption behavior of Pb2+ and Cd2+ ions on bauxite flotation tailings was investigated to demonstrate the adsorptivity of the bauxite flotation tailings.The adsorption percentage of Pb2+ and Cd2+ ions as a funct...The adsorption behavior of Pb2+ and Cd2+ ions on bauxite flotation tailings was investigated to demonstrate the adsorptivity of the bauxite flotation tailings.The adsorption percentage of Pb2+ and Cd2+ ions as a function of adsorbent dosage,solution pH value and shaking time were determined by batch experiments.The maximum adsorption percentage of 99.93% for Pb2+ ions and 99.75% for Cd2+ ions were obtained by using bauxite flotation tailings as adsorbent.The methods,such as zeta potentials,specific surface area measurements and the analysis of adsorption kinetics,were introduced to analyze the adsorption mechanisms of the Pb2+ ions on bauxite flotation tailings.The isoelectric point of bauxite flotation tailings shifts from 3.6 to 5.6 in the presence of Pb2+ ions.The specific surface area of bauxite flotation tailings changes from 12.57 to 20.63 m2/g after the adsorption of Pb2+ ions.These results indicate that a specific adsorption of the cation species happens on the surface of bauxite flotation tailings.Adsorption data of Pb2+ ions on the surface of bauxite flotation tailings can be well described by Langmuir model,and the pseudo-second-order kinetic model provides the best correlation for the adsorption data of Pb2+ and Cd2+ ions on bauxite flotation tailings.展开更多
The swelling and adsorption properties of the F44-PTU resin for metal ions Cu2+,Pb2+,Cd2+,Hg2+,Pt4+ and Pd2+ were studied, and the adsorption properties and mechanism for nobel metal ions Pt4+ and Pd2+ were studied es...The swelling and adsorption properties of the F44-PTU resin for metal ions Cu2+,Pb2+,Cd2+,Hg2+,Pt4+ and Pd2+ were studied, and the adsorption properties and mechanism for nobel metal ions Pt4+ and Pd2+ were studied especially. The results showed that the resin had the better adsorption properties for Pt4+ and Pd2+ than other metal ions, and also had bigger adsorption velocity. The adsorption process of the resin for Pt4+ fited the langmuir equation, while the adsorption of the resin for Pd2+ fited the Freundich equation. The process of adsorption of the resin for Pt4+ and Pd2+ were all exothermic.展开更多
以4-溴-1,8-萘二甲酸酐为原料,经亚胺化、酯化等反应,设计合成了一种新的乙烯基荧光功能单体N-甲基丙烯酰氧乙基-4-溴-1,8-萘酰亚胺(NPMA),并用此单体与N-异丙基丙烯酰胺(NIPAAm)通过自由基聚合制备了荧光共聚物PⅠ、PⅡ和PⅢ。采用1 H ...以4-溴-1,8-萘二甲酸酐为原料,经亚胺化、酯化等反应,设计合成了一种新的乙烯基荧光功能单体N-甲基丙烯酰氧乙基-4-溴-1,8-萘酰亚胺(NPMA),并用此单体与N-异丙基丙烯酰胺(NIPAAm)通过自由基聚合制备了荧光共聚物PⅠ、PⅡ和PⅢ。采用1 H NMR(核磁共振氢谱)、UV-vis(紫外-可见)光谱和荧光光谱对共聚物的结构及性能进行了表征,结果表明聚合物对金属Pd2+具有高灵敏度的选择性识别作用。展开更多
基金Project(2005CB623701) supported by the Major State Basic Research Development Program of China
文摘The adsorption behavior of Pb2+ and Cd2+ ions on bauxite flotation tailings was investigated to demonstrate the adsorptivity of the bauxite flotation tailings.The adsorption percentage of Pb2+ and Cd2+ ions as a function of adsorbent dosage,solution pH value and shaking time were determined by batch experiments.The maximum adsorption percentage of 99.93% for Pb2+ ions and 99.75% for Cd2+ ions were obtained by using bauxite flotation tailings as adsorbent.The methods,such as zeta potentials,specific surface area measurements and the analysis of adsorption kinetics,were introduced to analyze the adsorption mechanisms of the Pb2+ ions on bauxite flotation tailings.The isoelectric point of bauxite flotation tailings shifts from 3.6 to 5.6 in the presence of Pb2+ ions.The specific surface area of bauxite flotation tailings changes from 12.57 to 20.63 m2/g after the adsorption of Pb2+ ions.These results indicate that a specific adsorption of the cation species happens on the surface of bauxite flotation tailings.Adsorption data of Pb2+ ions on the surface of bauxite flotation tailings can be well described by Langmuir model,and the pseudo-second-order kinetic model provides the best correlation for the adsorption data of Pb2+ and Cd2+ ions on bauxite flotation tailings.
文摘The swelling and adsorption properties of the F44-PTU resin for metal ions Cu2+,Pb2+,Cd2+,Hg2+,Pt4+ and Pd2+ were studied, and the adsorption properties and mechanism for nobel metal ions Pt4+ and Pd2+ were studied especially. The results showed that the resin had the better adsorption properties for Pt4+ and Pd2+ than other metal ions, and also had bigger adsorption velocity. The adsorption process of the resin for Pt4+ fited the langmuir equation, while the adsorption of the resin for Pd2+ fited the Freundich equation. The process of adsorption of the resin for Pt4+ and Pd2+ were all exothermic.
文摘以4-溴-1,8-萘二甲酸酐为原料,经亚胺化、酯化等反应,设计合成了一种新的乙烯基荧光功能单体N-甲基丙烯酰氧乙基-4-溴-1,8-萘酰亚胺(NPMA),并用此单体与N-异丙基丙烯酰胺(NIPAAm)通过自由基聚合制备了荧光共聚物PⅠ、PⅡ和PⅢ。采用1 H NMR(核磁共振氢谱)、UV-vis(紫外-可见)光谱和荧光光谱对共聚物的结构及性能进行了表征,结果表明聚合物对金属Pd2+具有高灵敏度的选择性识别作用。
