合成的羧基化石墨烯(G-COOH)用FT-IR进行表征,并对G-COOH用于水溶液中甲基紫、中性红、灿烂黄和茜素红4种离子型染料的吸附性能进行了研究.考察了吸附剂用量、吸附时间、初始浓度以及溶液pH值等条件对吸附效果的影响.同时,研究了甲基紫染料的脱附性能,结果表明,用NaOH/EtOH混合溶液洗脱甲基紫,洗脱率可达88.2％,洗脱后的G-COOH可再利用.从热力学角度探讨得出,G-COOH对阳离子染料甲基紫和中性红的吸附行为能够较好的符合Langmuir等温吸附模型,而对阴离子染料灿烂黄和茜素红的吸附行为则能够较好的符合Freundlich等温吸附模型,计算的吸附参数表明,G-COOH对4种染料的吸附过程容易进行.动力学研究表明,G-COOH对4种离子型染料的吸附行为均能较好的符合准二级吸附模型.该实验研究表明,在处理染料废水时,G-COOH为相当优异的吸附剂.
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