通过三维打印喷墨喷嘴快速合成多孔石墨烯微球用于从水中选择性去除污染物
Rapid Synthesis of Porous Graphene Microspheres through a Three-Dimensionally Printed Inkjet Nozzle for Selective Pollutant Removal from Water.
作者信息
Li Dawei, Zhang Hao, Zhang Li, Wang Panfeng, Xu Hong, Xuan Jin
机构信息
State Key Laboratory of Chemical Engineering, School of Mechanical and Power Engineering, East China University of Science and Technology, 200237 Shanghai, China.
Department of Chemical Engineering, Loughborough University, LE11 3TU Loughborough, U.K.
出版信息
ACS Omega. 2019 Nov 25;4(24):20509-20518. doi: 10.1021/acsomega.9b02249. eCollection 2019 Dec 10.
Graphene microspheres are fabricated through a 3D-printed inkjet nozzle based on the gas-liquid microfluidic method. This method realizes rapid and controllable fabrication of uniform graphene microspheres with up to 800 μL min (ca. 1 L d) of yields, which is 2 orders of magnitude higher than those of the conventional microfluidic method. The diameter of the graphene microspheres could be flexibly controlled from 0.5 to 3.5 mm by adjusting the gas pressure. The porous graphene microspheres show great dye decoloration performance. The maximum adsorption capacity of methylene blue is 596 mg/g, which is the highest adsorption capacity among that of the reduced graphene-oxide absorbents. A performance improvement of 21% is obtained by applying sodium alginate into graphene as a curing agent. The adsorption behavior follows a Langmuir isotherm and pseudo-second-order kinetic model. Besides, the graphene microspheres exhibit great selective adsorption and could separate cationic dye methylene blue (MB) and anionic dye methyl orange (MO).
石墨烯微球是基于气液微流控方法通过3D打印喷墨喷嘴制备而成的。该方法实现了均匀石墨烯微球的快速可控制备，产量高达800 μL/min（约1 L/d），比传统微流控方法高出2个数量级。通过调节气压，石墨烯微球的直径可在0.5至3.5毫米之间灵活控制。多孔石墨烯微球表现出优异的染料脱色性能。亚甲基蓝的最大吸附容量为596 mg/g，是还原氧化石墨烯吸附剂中最高的吸附容量。通过将海藻酸钠作为固化剂应用于石墨烯中，性能提高了21%。吸附行为遵循朗缪尔等温线和准二级动力学模型。此外，石墨烯微球表现出良好的选择性吸附，能够分离阳离子染料亚甲基蓝（MB）和阴离子染料甲基橙（MO）。
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