摘要
以聚N-异丙基丙烯酰胺-丙烯酸共聚微凝胶(PNIPA-co-AA)为吸附剂,采用静态批试法研究了Ni(Ⅱ)在共聚微凝胶上的吸附行为。探讨了震荡时间、固液比、pH值、离子强度及温度等因素对吸附结果的影响,测定了共聚微凝胶在不同温度下对Ni(Ⅱ)的吸附等温线。结果表明:固液比、pH值和离子强度均对吸附过程有明显影响;吸附过程在30min内即可达到平衡;Langmiur方程能够很好的拟合吸附等温线。热力学参数(ΔH、ΔS和ΔG)表明,此吸附过程是一个自发、吸热的过程。吸附能力在经过7次的吸附-解吸附过程后没有明显的下降。离子交换是此吸附过程的主要机理。
In this work, the copolymer microgel of N-isopropyl acrylamid-co-acrylic acid （PNIPA-co-AA） were used as a novel adsorbent for removing Ni（Ⅱ ） from aqueous solution. The adsorption of Ni（ Ⅱ ） onto PNIPA-eo-AA was studied as a function of contact time, sol- id/liquid ratio, pH value, ionic strength and temperature. The adsorption isotherm of Ni（ Ⅱ ） adsorption onto copolymer microgels at different temperature were measured. The results show that Ni（ Ⅱ） adsorption onto PNIPA-co-AA is strongly depend on solid/liquid ratio, pH value and ionic strength. Kinetic data indicate that the adsorption process achieves equilibrium within 30 rain. Thermodynamics data indicate that the adsorption fits the Lang-miur model and its linearized form well and the Ni（ Ⅱ ） adsorption onto copolymer microgels is a spontaneous and endothermic nature process. The adsorption capacity is not signification reduced after seven times of adsorption-desorption cycles. Ions exchange is the predominant mechanism of Ni（ Ⅱ ） adsorption onto PNIPA-co-AA. Present study suggests that the copol- ymer microgels maybe a promising candidate for concentration of heavy metal ions and radio- nuclides from industrial wastewater.
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2015年第6期484-489,共6页
Journal of Nuclear and Radiochemistry
基金
国家自然科学基金资助项目(21501082)
甘肃中医学院2014引进人才科研启动金(2305136002)
兰州大学中央高校基本科研业务费专项资金(lzujbky-2014-171)
