Liu Jun, Xia Siying, Lü Xiaomeng, Shen Hongxiang
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China E-mail:
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
Water Sci Technol. 2017 Sep;76(5-6):1565-1573. doi: 10.2166/wst.2017.317.
Phosphorus flame retardant tricresyl phosphate (TCP) adsorption on graphene nanomaterials from aqueous solutions was explored using batch and column modes. Comparative studies were performed regarding the kinetics and equilibrium of TCP adsorption on graphene oxide (GO) and graphene (G) in batch mode. The adsorption kinetics exhibited a rapid TCP uptake, and experimental data were well described by the pseudo-second-order kinetic model. Adsorption isotherm data of TCP on the two adsorbents displayed an improved TCP removal performance with increasing temperature at pH 5, while experimental data were well described by the Langmuir isotherm model with a maximum adsorption capacity of 87.7 mg·g for G, and 30.7 mg·g for GO) at 303 K. The thermodynamic parameters show that the adsorption reaction is a spontaneous and endothermic process. In addition, dynamic adsorption of TCP in a fixed G column confirmed a faster approach to breakthrough at high flow rate, high influent TCP concentration, and low filling height of adsorbent. Breakthrough data were successfully described by the Thomas and Yoon-Nelson models.
采用间歇式和柱式模式研究了磷系阻燃剂磷酸三甲苯酯（TCP）从水溶液中在石墨烯纳米材料上的吸附情况。在间歇式模式下，对TCP在氧化石墨烯（GO）和石墨烯（G）上吸附的动力学和平衡进行了对比研究。吸附动力学表现出对TCP的快速摄取，实验数据能用准二级动力学模型很好地描述。在pH值为5时，两种吸附剂上TCP的吸附等温线数据显示，随着温度升高，TCP去除性能有所提高，实验数据能用朗缪尔等温线模型很好地描述，在303 K时，G对TCP的最大吸附容量为87.7 mg·g，GO为30.7 mg·g。热力学参数表明吸附反应是一个自发的吸热过程。此外，在固定的G柱中对TCP进行动态吸附证实，在高流速、高进水TCP浓度和低吸附剂填充高度的情况下，突破更快。突破数据能用托马斯模型和尹-尼尔森模型成功描述。
