The rapid coagulation of graphene oxide on La-doped layered double hydroxides
| Autor: | Yinshi Li, Zhongshan Chen, Tao Wen, Yuantao Chen, Bashir Ahmad, Xiangke Wang, Songsheng Lu, Jian Wang, Junxiang Peng, Jun Hu, Wanying Chen, Tasawar Hayat |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Oxide Nanoparticle chemistry.chemical_element 02 engineering and technology Electrolyte 010501 environmental sciences engineering.material 01 natural sciences Industrial and Manufacturing Engineering Nanomaterials law.invention chemistry.chemical_compound law Lanthanum Environmental Chemistry 0105 earth and related environmental sciences Aqueous solution Graphene Layered double hydroxides General Chemistry 021001 nanoscience & nanotechnology chemistry engineering 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal. 309:445-453 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2016.10.053 |
| Popis: | Since graphene oxide (GO) has been found to be one of the toxic graphene-based nanomaterials, the environmental behavior of GO has been studied extensively in aqueous solution systems. In this work, the large ionic radius lanthanum (La) was doped onto the layered double hydroxides (LDHs), which was conducive to remove the negatively charged GO. The results showed that the coagulation of GO on La-doped LDHs was dependent on pH and the types of electrolytes. After calcined at 400 °C for 4 h, the maximum GO removal capacities could reach 565.8 mg/g on Mg/Al/La-CLDHs and 558.6 mg/g on Ca/Al/La-CLDHs at GO initial concentration of 120 mg/L and LDHs content of 0.2 g/L. The short equilibrium time and high removal capacity suggested the huge advantage of LDHs in practical applications. More importantly, the La-doped LDHs could still exhibit high removal capacities after five cycles, indicating that the La-doped LDHs hold good reusability and could be used for GO pollution cleanup from water. The coagulation of GO on La-doped LDHs was mainly dominated by electrostatic attraction and hydrogen bond. These findings were useful to understand the environmental fate and transport of GO nanoparticles in aqueous systems. |
| Databáze: | OpenAIRE |
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