Xie Yi, Chen Changlun, Ren Xuemei, Tan Xiaoli, Song Gang, Chen Diyun, Alsaedi Ahmed, Hayat Tasawar
Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China; University of Science and Technology of China, Hefei 230026, PR China.
Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China; MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; NAAM Research Group, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
J Colloid Interface Sci. 2019 Aug 15;550:117-127. doi: 10.1016/j.jcis.2019.04.090. Epub 2019 Apr 30.
Uranium is not merely a momentous resource for nuclear energy, but also a highly toxic pollutant which has aroused global attention. The efficient handling of uranium from contaminated water is urgent. Herein, to acquire the improved performance of MOFs for U(VI) capture, a 2D/3D hybrid NH-UiO-66/g-CN (NU6CN) adsorbent was designed and fabricated through one-step hydrothermal approach. With the newly synthesized efficient NU6CN composite, the U(VI) loading amount could reach 195.55 mg·g, which significantly outperformed that of the individual NH-UiO-66 (134.09 mg·g) and g-CN (53.69 mg·g) at pH 5.0 and 298 K. The adsorption process conformed to the Langmuir and pseudo-second-order model. Subsequently, based on this system, the underlying interaction mechanism between U(VI) and NU6CN was carefully investigated. The formation of an inner-sphere complex on NU6CN surface was determined by the macroscopic and microscopic data. In the light of XPS analysis, the adsorption of U(VI) on NU6CN was attributable to the synergism of the ample nitrogen- and oxygen-bearing functional groups (e.g., NCN, OCO, CO) derived from g-CN and NH-UiO-66. Additionally, NU6CN revealed good recoverability and recyclability by adsorption/desorption test. These findings presented herein demonstrated the remarkable potential of as-prepared adsorbents for the uranium-contaminated water remediation.
