Adsorption of selected dyes on Ti3C2Tx MXene and Al-based metal-organic framework |
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| Affiliation: | 1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, Jiangxi Province, China;2. Key Laboratory of Poyang Lake Environment and Resource Utilization (Nanchang University) of Ministry of Education, Environmental Testing Center of Nanchang University, School of Resource, Environmental and Chemical Engineering, Nanchang University, Nanchang, 330031, Jiangxi, PR China;1. Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, PR China;2. Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing, 100084, PR China;3. Department of Chemistry and Center for Nanotechnology and Institute of Biomedical Technology, Chung-Yuan Christian University, Chung-Li, 32023, Taiwan;1. Department of Environmental Science, College of Energy and Environmental Science, Alkarkh University of Science, Baghdad, Iraq;2. Environment and Water Directorate, Ministry of Science and Technology, Baghdad, Iraq;1. Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, PO Box 5825, Doha, Qatar;2. College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, PO Box 5825, Doha, Qatar;1. Department of Civil and Environmental Engineering, University of South Carolina, Columbia, 300 Main Street, SC, 29208, USA;2. Department of Environmental Engineering, Kwangwoon University, 447-1 Wolgye-Dong Nowon-Gu, Seoul, Republic of Korea;3. Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea;4. Department of Civil and Environmental Engineering, Korea Army Academy at Young-cheon, 495 Hogook-ro, Kokyungmeon, Young-Cheon, Gyeongbuk, 38900, Republic of Korea;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;2. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, 53 Zhengzhou Road, Qingdao 266042, PR China;4. Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, PR China |
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| Abstract: | MXene and metal organic framework (MOF) were used as the main adsorbents to remove synthetic dyes from model wastewater. Methylene blue (MB) and acid blue 80 (AB) were used as the model cationic and anionic synthetic dyes, respectively. To investigate the physicochemical properties of the adsorbents used, we carried out several characterizations using microscopy, powder X-ray diffraction, a porosimetry, and a zeta potential analyzer. The surface area of MXene and MOF was 9 and 630 m2 g?1, respectively, and their respective isoelectric points were approximately pH 3 and 9. Thus, MXene and MOF exhibited high capacity for MB (~140 mg g?1) and AB (~200 mg g?1) adsorption, respectively due to their electrostatic attractions when the concentrations of the adsorbents and adsorbates were 25 and 10 mg L?1. Furthermore, the MOF was able to capture the MB due mainly to hydrophobic interactions. In terms of the advantages of each adsorbent according to our experimental results, MXene exhibited fast kinetics and high selectivity. Meanwhile, the MOF had a high adsorption capacity for both MB and AB. The adsorption mechanisms of both adsorbents for the removal of MB and AB were clearly explained by the results of our analyses of solution pH, ionic strength, and the presence of divalent cation, anion, or humic acids, as well as other characterizations (i.e., Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy). According to our results, MOF and MXene can be used as economical treatments for wastewater containing organic pollutants regardless of charge (e.g., MB and AB), and positively charged one (e.g., MB), respectively. |
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| Keywords: | Adsorption Methylene blue Acid blue 80 MXene Metal-organic framework |
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