Journal of Polymer Research ( IF 2.8 ) Pub Date : 2019-11-23 , DOI: 10.1007/s10965-019-1971-6 Ting Li , Xiaojin Liu , Luzhong Li , Yang Wang , Piming Ma , Mingqing Chen , Weifu Dong
Polydopamine-Functionalized graphene oxide (PDA-GO) was used to form Polyvinyl Alcohol/Chitosan/PDA-GO (PVA/CS/PDA-GO) hydrogels. FTIR, TGA and SEM investigation showed that PDA had been successfully loaded on graphene oxide nanosheets. Adsorption of metal ions onto the novel PVA/CS/PDA-GO hydrogel beads with variations in pH, contact time, initial metal concentration and temperature had been investigated. Adsorption data were well accurately described by Langmuir isotherm and pseudo-second-order kinetic model at the optimum pH 5.5. The maximum adsorption capacities of the PVA/CS/PDA-GO were 210.94 mg·g−1, 236.20 mg·g−1 and 214.98 mg·g−1 for Cu(II), Pb(II) and Cd(II) ions with 40 C, respectively. Meanwhile, desorption efficiency and reusability of the adsorbents were assessed on basis of six consecutive adsorption-desorption cycles. This work provides a simple and environmentally friendly method to obtain the PVA/CS/PDA-GO hydrogel beads, which really would be a potential recyclable adsorbent for removal of hazardous metal ions in waste water.
中文翻译:
聚多巴胺官能化氧化石墨烯与聚乙烯醇/壳聚糖水凝胶复合对水溶液中cu(II),Pb(II)和cd(II)的可回收吸附
使用聚多巴胺官能化的氧化石墨烯(PDA-GO)形成聚乙烯醇/壳聚糖/ PDA-GO(PVA / CS / PDA-GO)水凝胶。FTIR,TGA和SEM研究表明PDA已成功负载在氧化石墨烯纳米片上。研究了在pH,接触时间,初始金属浓度和温度变化的情况下,金属离子在新型PVA / CS / PDA-GO水凝胶微球上的吸附。Langmuir等温线和最适pH 5.5的拟二级动力学模型很好地描述了吸附数据。的PVA / CS / PDA-GO的最大吸附量分别为210.94毫克·克-1,236.20毫克·克-1和214.98毫克·克-1分别具有40 C的Cu(II),Pb(II)和Cd(II)离子。同时,基于六个连续的吸附-解吸循环来评估吸附剂的解吸效率和可重复使用性。这项工作为获得PVA / CS / PDA-GO水凝胶珠粒提供了一种简单且环保的方法,它确实是去除废水中有害金属离子的潜在可回收吸附剂。