Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
J Environ Sci (China). 2020 Apr;90:395-407. doi: 10.1016/j.jes.2019.11.018. Epub 2019 Dec 18.
In this work, we proposed a green and cost-effective method to prepare a graphene-based hyper-cross-linked porous carbon composite (GN/HCPC) by one-pot carbonization of hyper-cross-linked polymer (HCP) and glucose. The composite combined the advantages of graphene (GN) and hyper-cross-linked porous carbon (HCPC), leading to high specific surface area (396.93 m/g) and large total pore volume (0.413 cm/g). The resulting GN/HCPC composite was applied as an adsorbent to remove 2,4-dichlorophenol (2,4-DCP) from aqueous solutions. The influence of different solution conditions including pH, ionic strength, contact time, system temperature and concentration of humic acid was determined. The maximum adsorption capacity of GN/HCPC composite (calculated by the Langmuir model) could reach 348.43 mg/g, which represented increases of 43.6% and 13.6% over those of the as-prepared pure GN and HCPC, respectively. The Langmuir model and pseudo-second-order kinetic model were found to fit well with the adsorption process. Thermodynamic experiments suggested that the adsorption proceeded spontaneously and endothermically. In addition, the GN/HCPC composite showed high adsorption performance toward other organic contaminants including tetracycline, bisphenol A and phenol. Measurement of the adsorption capability of GN/HCPC in secondary effluent revealed a slight decrease over that in pure water solution. This study demonstrated that the GN/HCPC composite can be utilized as a practical and efficient adsorbent for the removal of organic contaminants in wastewater.
在这项工作中，我们提出了一种绿色且经济有效的方法，通过超交联聚合物（HCP）和葡萄糖的一锅碳化来制备基于石墨烯的超交联多孔碳复合材料（GN/HCPC）。该复合材料结合了石墨烯（GN）和超交联多孔碳（HCPC）的优点，具有高比表面积（396.93 m²/g）和大总孔体积（0.413 cm³/g）。所得的 GN/HCPC 复合材料被用作吸附剂，从水溶液中去除 2,4-二氯苯酚（2,4-DCP）。研究了不同溶液条件（包括 pH 值、离子强度、接触时间、系统温度和腐殖酸浓度）的影响。通过 Langmuir 模型计算，GN/HCPC 复合材料的最大吸附容量（348.43 mg/g）分别比制备的纯 GN 和 HCPC 增加了 43.6%和 13.6%。Langmuir 模型和拟二级动力学模型都很好地拟合了吸附过程。热力学实验表明，吸附过程是自发和吸热的。此外，GN/HCPC 复合材料对其他有机污染物（包括四环素、双酚 A 和苯酚）也表现出高吸附性能。在二级出水条件下测量 GN/HCPC 的吸附能力，发现其吸附能力略低于纯水条件下的吸附能力。本研究表明，GN/HCPC 复合材料可用作去除废水中有机污染物的实用高效吸附剂。
