通过离子交联与原位还原组装制备了一种海藻酸钠改性石墨烯双网络水凝胶珠(CG),对样品的结构与形貌进行了红外光谱、拉曼光谱、扫描电镜表征,研究了其对结晶紫染料的吸附性能。结果表明:氧化石墨烯与海藻酸钙之间存在较强的氢键相互作用,形成了石墨烯片层3D网络与海藻酸钙双网络结构水凝胶珠,凝胶球具有良好的力学性能,在pH=1.2及pH=7.4溶液中表现出不同的溶胀行为,呈现pH智能响应性。石墨烯凝胶珠内部呈现多孔结构,对结晶紫染料表现出较高的吸附能力与较快的吸附速率,最大吸附量为363.6mg/g。利用在不同pH溶液的吸附性能不同,实现水凝胶珠的再生和重复使用,重复使用5次后,去除率仍保持在90%左右。吸附等温模型符合Langmuir模型,Freundlich模型表明该吸附过程为有利吸附,吸附动力学符合伪二级动力学模型。
A sodium alginate modified graphene double network hydrogel beads (CG) were prepared by ionic crosslinking and in-situ reduction assembly.The structure and morphology of the sample were characterized by infrared spectroscopy,Raman spectroscopy and scanning electron microscopy,and the adsorption performance of the beads toward crystal violet dye was investigated.The results showed that there was a strong hydrogen bonding interaction between graphite oxide and alginate,forming a graphene lamellar 3D network and calcium alginate double network structure hydrogel beads,and the gel beads had good mechanical properties,exhibited different swelling behavior in pH=1.2 and pH=7.4 solutions,and showed pH intelligent responsiveness.The graphene gel beads showed a porous structure internally and exhibited high adsorption capacity and fast adsorption rate for crystal violet dye,with the maximum adsorption capacity of 363.6mg/g.The regeneration and reuse of hydrogel beads were realized by taking advantage of the different adsorption properties in different pH solutions.,and the removal rate was still maintained at about 90% after five times of reuse.The adsorption isotherm model was consistent with the Langmuir model,and the Freundlich model indicated that the adsorption process was favorable,and the adsorption kinetics conformed the pseudo second-order kinetic model.
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基金资助
河南省科技公关项目(242102231010)
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