In this study, the graphene oxide (GO) was made from graphite powder via a modified Hummers method, then carboxylated to GOCOOH in a mixture of a strong basic pH from mixing in the chloroacetic acid with NaOH. The GO and GOCOOH were characterized by means of the HR-TEM, FTIR, XRD and zeta potential. On this basis, the Cu(II) was adsorbed onto the GO and GOCOOH in aqueous solutions using the simple batch-adsorption mode. The amount of thus-removed Cu(II) was successfully varied, depending on the pH values, initial copper concentration, reaction time and reaction temperature. Under the ambient temperature at pH 6 over 60-min adsorption time, the highest removal efficiency of Cu²⁺ are 97 and 99.4%, respectively. The experimental data agree well with the Langmuir isotherm in both cases, and the maximum adsorption capacities of GO and GOCOOH are 277.77 and 357.14 (mg/g), respectively. The metal adsorption of the GOCOOH is better than other carbonaceous adsorbents, and is exothermic and spontaneous from the calculations of chemical thermodynamics. The effect of competing cations on adsorption of Cu(II) ions on GO and GOCOOH was evaluated by mono and divalent metals. The reusability of GO and GOCOOH were estimated and it was found that both adsorbents have good regeneration properties.

在这项研究中，氧化石墨烯（GO）是通过改良的Hummers方法由石墨粉末制成的，然后通过将氯乙酸与NaOH混合在强碱性pH的混合物中羧化为GO COOH。GO和GO COOH通过HR-TEM，FTIR，XRD和ζ电势表征。在此基础上，使用简单的分批吸附模式将Cu（II）吸附在水溶液中的GO和GO COOH上。根据pH值，初始铜浓度，反应时间和反应温度成功地改变了如此除去的Cu（II）的量。在pH 6的环境温度下经过60分钟的吸附时间，Cu ^2+的去除效率最高分别是97％和99.4％。在两种情况下，实验数据均与Langmuir等温线吻合良好，GO和GO COOH的最大吸附容量分别为277.77和357.14（mg / g）。GO COOH的金属吸附性能优于其他碳质吸附剂，并且根据化学热力学计算是放热的和自发的。通过一价和二价金属评估竞争阳离子对GO和GO COOH上Cu（II）离子吸附的影响。评估了GO和GO COOH的可重复使用性，发现这两种吸附剂均具有良好的再生性能。