氧化石墨烯改性海藻酸钠凝胶球的吸附性能

以海藻酸钠为基质、氧化石墨烯为改性添加剂,采用离子交换法制备了复合凝胶球,并将此凝胶球作为吸附剂,研究了吸附剂用量、pH值、温度和染料初始质量浓度对复合凝胶球去除水中亚甲基蓝染料的影响。结果表明:当吸附剂用量为4g、pH值为7、温度为45℃、亚甲基蓝初始质量浓度为40mg/L时,由Langmuir方程计算得凝胶球对亚甲基蓝的最大吸附容量为90.91mg/g。动力学研究表明,准二阶模型能够更好地拟合实验数据;等温吸附试验研究表明,Freundlich模型较好地拟合了实验数据;热力学研究表明该吸附过程是一个自发的吸热过程。凝胶球可循环再生,成本低廉,在染料废水治理方面有良好的应用前景。

Adsorption Properties of Sodium Alginate Gel Modified by Graphene Oxide

Composite gel balls were prepared by ion exchange method with sodium alginate and graphene oxide .Sodium alginate was used as matrix and graphene oxide was used as modifier .The effects of adsorbent dosage , pH, temperature and initial dye concentration on the removal of methylene blue dye by composite gel balls were studied .The maximum adsorption ca-pacity acquired by Langmuir equation reached 90.91 mg/g when adsorbent dosage was 4 g, pH was 7, temperature was 45℃, and initial concentration of methylene blue was 40 mg/L.The adsorption process was fitted pseudo-second-order ki-netics model better through the study of kinetics .The experiment data was well-described by Freundlich model through the adsorption isotherm studies .Thermodynamic studies indicated that the adsorption process was a spontaneous endothermic process.The gel balls were recycled and low cost .Therefore, there were good applications prospects in the dye wastewater treatment.