Guo Xiaoqing, Qu Lijun, Tian Mingwei, Zhu Shifeng, Zhang Xiansheng, Tang Xiaoning, Sun Kaikai
College of Textiles, Qingdao University, Qingdao, Shandong, 266071, China.
Water Environ Res. 2016 Jul;88(7):579-88. doi: 10.2175/106143016X14609975746325.
Chitosan, modified with different dosages of graphene oxide (GO) and reduced graphene oxide (rGO), was first prepared, and its adsorption capacity for reactive red (RR) dye in aqueous solutions was investigated, in this paper. The structure and morphology of the adsorbents were characterized by FT-IR, XRD, SEM, EDX, BET, and TGA. The effect of varying parameters (pH, temperature, adsorbent loading, and contact time) was also investigated. The maximum adsorption capacity based on the Langmuir model was found to be 32.16 mg/g. In addition, experimental kinetic data were analyzed by the psuedo-first order and psuedo-second order equation models. The psuedo-second order model proved to be the best model for the adsorption system, which suggested that adsorption might be controlled by the chemical rate-limiting step through sharing of electrons or by covalent forces.
本文首先制备了用不同剂量的氧化石墨烯（GO）和还原氧化石墨烯（rGO）改性的壳聚糖，并研究了其对水溶液中活性红（RR）染料的吸附能力。通过傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDX）、比表面积分析仪（BET）和热重分析（TGA）对吸附剂的结构和形貌进行了表征。还研究了不同参数（pH值、温度、吸附剂负载量和接触时间）的影响。基于朗缪尔模型的最大吸附容量为32.16 mg/g。此外，用伪一级和伪二级方程模型对实验动力学数据进行了分析。伪二级模型被证明是吸附系统的最佳模型，这表明吸附可能是由通过电子共享或共价力的化学限速步骤控制的。
