海藻酸钠/丙烯酰胺/氧化石墨烯复合凝胶球的制备与吸附性能研究

Preparation and study of adsorption properties of sodium alginate/acrylamide/graphene oxide composite gel balls

利用氧化石墨烯机械强度高、比表面积大的优良特性和海藻酸钠良好的成球性能,以海藻酸钠、丙烯酰胺和氧化石墨烯为原料,采用离子交换法制备了复合凝胶球。通过改变凝胶球的用量、pH值、温度、结晶紫初始浓度等因素,研究了凝胶球对结晶紫的吸附性能。实验结果表明,在凝胶球用量为1.5g,pH值为7,温度为35℃,结晶紫初始浓度为30mg/L时,凝胶球对结晶紫的去除率达到93.44%,吸附容量为47.08mg/g。通过吸附等温线研究,发现Freundlich模型比Langmuir模型对实验数据的拟合更好,其相关系数R2>0.99。热力学研究表明,该吸附过程是一个自发吸热的物理过程。凝胶球原料易得,可生物降解,因此,凝胶球在工业废水处理、染料去除、环境保护等方面有潜在的应用价值。

Northeast Forestry University?Harbin150040,China)Abstract:By taking advantage of the excellent properties of high mechanical strength and huge surface area of graphene oxide as well as the good performance into a ball of sodium alginate,in this paper,composite gel balls were prepared by ion exchange with sodium alginate,acrylamide and graphene oxide.The adsorptive property of composite gel balls on crystal violet were studied by changing adsorbent dosage,pH value,temperature and ini-tial concentrations of crystal violet.The results showed that when the dosage of composite gel balls,pH,tem-perature and initial concentration of crystal violet were1.5g,7,35°C and30mg/L,the removal rate of crystal violet and adsorption capacity were93.44//〇and47.08mg/g.The experiment data was fitted Freundlich model better than Langmuir model through the adsorption isotherm study with the correlation coefficient(i.2>0.99).Thermodynamic studies showed that the adsorption process was a spontaneous endothermic physisorption process.The raw materials of gel balls were easily obtained and biodegradable,therefore,there were potential applications of gel balls in the industrial wastewater treatment,removal of dyes and environmental protection and other fields.