摘要
制备聚乙烯醇(PVA)/壳聚糖(CTS)/氧化石墨烯(GO)复合水凝胶球,通过红外光谱(IR)、扫描电子显微镜(SEM)对复合水凝胶进行了表征。研究了pH值、吸附时间及重金属离子初始浓度对吸附Pb(Ⅱ)(二价铅离子)容量的影响,结果表明在pH=5.5、30℃时,复合水凝胶对Pb(Ⅱ)的饱和吸附量达到198.00mg/g,吸附符合二级动力学模型,吸附过程符合Langmuir等温吸附模型,吸附为熵推动的自发吸热过程。与未加氧化石墨烯相比,复合水凝胶的最大吸附容量明显提高。对Pb(Ⅱ)吸附,可再生重复使用6次而吸附量基本保持不变。
A novel composite hydrogel beads,composed of polyvinyl alcohol（PVA）,chitosan（CTS）and graphene oxide（GO）were prepared by an instantaneous gelation method.Adsorption of Pb（Ⅱ）onto PVA/CTS/GO hydrogel beads was investigated with respect to pH,adsorption time,temperature and initial concentration of Pb（Ⅱ）.The maximum adsorption capacity of hydrogel beads were found to be 198.00mg·g-1 for Cu（Ⅱ）at 30℃ and pH value of 5.5.The adsorption process followed pseudo-second-order kinetics and fitted the Langmuir adsorption isotherm models.Thermodynamic studies indicated that the adsorption was spontaneous and endothermic process in nature.The maximum adsorption capacities of PVA/CTS/GO hydrogel beads were much higher than that of PVA/CTS hydrogel.Moreover,the hydrogel beads could be regenerated and reused up to 6times without was apparent decrease in adsorption capacity.
出处
《化工新型材料》
CAS
CSCD
北大核心
2016年第4期112-115,共4页
New Chemical Materials
基金
教育部科学技术研究项目(113034A)
