摘要
An acrylic modified pumpkin vine-based biochar(p-PVB-PAA) is synthesized by non-thermal plasma-grafting modification of pumpkin vine-based biochar(PVB) for the removal of uranyl from an aqueous solution. Microscopic characterization reveals that compared to PVB the surface of p-PVBPAA has more oxygen-containing functional groups by strong chemical bonding and the specific surface area is increased to 275.3 m^2 g^-1 from 3.8 m^2g^-1. It is found that p-PVB-PAA showed a much higher maximum adsorption capacity for uranyl from aqueous solutions than PVB, which were207.02 mg g^-1 and 67.58 mg g^-1 at pH=5 and 298 K, respectively. Moreover, the adsorption behavior follows a pseudo-second-order kinetics model and the Langmuir adsorption model.Additionally, macroscopic experiments and spectroscopic studies verified that the significantly improved adsorption performance of the p-PVB-PAA is due to surface complexation and electrostatic interactions. Furthermore, the very high removal efficiency and excellent regeneration ability(the percentage of the removal still remained at nearly 90% after five cycles) makes this low-cost, easily obtained, and environmentally friendly material attractive for commercial application.
An acrylic modified pumpkin vine-based biochar（p-PVB-PAA） is synthesized by non-thermal plasma-grafting modification of pumpkin vine-based biochar（PVB） for the removal of uranyl from an aqueous solution. Microscopic characterization reveals that compared to PVB the surface of p-PVBPAA has more oxygen-containing functional groups by strong chemical bonding and the specific surface area is increased to 275.3 m2 g-1 from 3.8 m2g-1. It is found that p-PVB-PAA showed a much higher maximum adsorption capacity for uranyl from aqueous solutions than PVB, which were207.02 mg g-1 and 67.58 mg g-1 at pH?=?5 and 298 K, respectively. Moreover, the adsorption behavior follows a pseudo-second-order kinetics model and the Langmuir adsorption model.Additionally, macroscopic experiments and spectroscopic studies verified that the significantly improved adsorption performance of the p-PVB-PAA is due to surface complexation and electrostatic interactions. Furthermore, the very high removal efficiency and excellent regeneration ability（the percentage of the removal still remained at nearly 90% after five cycles） makes this low-cost, easily obtained, and environmentally friendly material attractive for commercial application.
作者
Jinxin YI
Zhipeng HUO
Xiaoli TAN
Changlun CHEN
Jiaxing LI
易锦馨;霍志鹏;谭小丽;陈长伦;Abdullah M ASIRI;Khalid A ALAMRY;李家星(Key Laboratory of Photovolatic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;University of Science and Technology of China, Hefei 230026, People's Republic of China;School of Environment and Chemical Engineering, North China Electric Power University, Beijing 102206, People's Republic of China;Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia)
基金
financially supported by the National High Technology Research and Development Program of China (No. 21677146)
National Natural Science Foundation of China (Nos. 21876178, U1607102)
the Anhui Provincial Natural Science Foundation (No. 1708085MB31)
