【摘要】 首先对石墨烯进行改性，合成了磺酸化石墨烯（SGO）.采用共混交联的方法，将SGO加入到海藻酸钠（SA）中并以CaCl₂为交联剂制备了SA/SGO复合水凝胶球.通过单因素实验研究了凝胶球对模拟废水中重金属离子(Pb²⁺)的去除效果，探讨了溶液pH值、金属离子初始浓度和吸附反应时间等对Pb²⁺吸附的影响.结果表明：SA/SGO对Pb²⁺的吸附是一个较快的过程，大约60 min即可达到吸附平衡，最大吸附容量为248.90 mg·g^-1.SA/SGO凝胶球对Pb²⁺的吸附等温线遵循Langmuir模型，表明Pb²⁺在凝胶球上的吸附是单分子层的.此外，经过5次吸附解吸后，凝胶球对Pb²⁺的吸附能力仅下降了不到10%,表明SA/SGO凝胶球拥有优异的再生性能.更多还原

【Abstract】 In this paper, graphene was first modified to synthesize sulfonated graphene oxide（SGO） and then added to sodium alginate（SA） to prepare the SA/SGO composite hydrogel beads with CaCl₂ as crosslinking agent.The effect of pH value, initial concentration of metal ions and adsorption time on the removal efficiency of heavy metal ions(Pb²⁺) in simulated wastewater was studied and discussed.The results showed that the adsorption of Pb²⁺ by SA/SGO composite hydrogel beads was a fast process, and the adsorption equilibrium could be reached in about 60 minutes with the maximum adsorption capacity of 248.90 mg·g^-1.The adsorption isotherms of SA/SGO hydrogel beads followed the Langmuir model, indicating that the adsorption of Pb²⁺ on the hydrogel beads was monolayer.After 5 times of adsorption and desorption, the adsorption capacity of hydrogel beads for Pb²⁺ decreased by less than 10%,indicating that the SA/SGO hydrogel beads possessed excellent regeneration performance.更多还原