Enhanced adsorption of U(VI) and 241Am(III) from wastewater using Ca/Al layered double hydroxide@carbon nanotube composites

Haijun Chen; Zhe Chen; Guixia Zhao; Zhibin Zhang; Chao Xu; Yunhai Liu; Jing Chen; Li Zhuang; Tasawar Haya; Xiangke Wang

doi:10.1016/j.jhazmat.2017.12.062

Enhanced adsorption of U(VI) and ²⁴¹Am(III) from wastewater using Ca/Al layered double hydroxide@carbon nanotube composites

J Hazard Mater. 2018 Apr 5:347:67-77. doi: 10.1016/j.jhazmat.2017.12.062. Epub 2017 Dec 25.

Authors

Haijun Chen¹, Zhe Chen², Guixia Zhao³, Zhibin Zhang⁴, Chao Xu⁵, Yunhai Liu⁶, Jing Chen⁶, Li Zhuang², Tasawar Haya⁵, Xiangke Wang⁷

Affiliations

¹ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China.
² College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
³ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China. Electronic address: guixiazh@techem.rub.de.
⁴ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China. Electronic address: zhbzhang@ecit.cn.
⁵ NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
⁶ Collaborative Innovation Center of Advanced Nuclear Energy Technology, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China.
⁷ College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China; School of Chemistry, Biological and Materials Sciences, East China University of Technology, Nanchang, 330013, PR China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences, Soochow University, 215123, Suzhou, PR China. Electronic address: xkwang@ncepu.edu.cn.

PMID: 29289767
DOI: 10.1016/j.jhazmat.2017.12.062

Abstract

Ca/Al layered double hydroxide decorated carbon nanotube (Ca/Al-LDH@CNTs) composites were fabricated by co-precipitation method and hydrothermal aged treatment. The prepared Ca/Al-LDH@CNTs was characterized by SEM, TEM, EDS, XRD, FT-IR, UV-vis and XPS techniques, and applied to remove U(VI) from aqueous solutions under various environmental conditions (i.e., pH, ionic strength, temperature and contact time). The results indicated that the adsorption of U(VI) on Ca/Al-LDH@CNTs was four times higher than that of U(VI) on bare CNTs. The kinetic investigations reflected the chemisorption of U(VI) on Ca/Al-LDH@CNTs through oxygen-containing functional groups. The adsorption isotherms demonstrated that the adsorption of U(VI) was well fitted by Langmuir model and the maximum adsorption capacity of U(VI) on Ca/Al-LDH@CNTs was calculated to be 382.9 mg g^-1 at 289.15 K. The thermodynamic parameters calculated from temperature-dependent isotherms suggested that U(VI) adsorption on Ca/Al-LDH@CNTs were endothermic and spontaneous process. Furthermore, Ca/Al-LDH@CNTs could remove ∼91% of ²⁴¹Am(III) at pH = 8.0, which confirmed Ca/Al-LDH@CNTs as a promising material for multiply low level radionuclides' pollution remediation.

Keywords: Adsorption; Ca/Al-LDH@CNTs composites; Interaction mechanism; U(VI)(241)Am(III).

Publication types

Research Support, Non-U.S. Gov't