Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 527, Issue -, Pages 267-279Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.05.028
Keywords
Metal organic framework; Polyurethane membrane; Wastewater treatment; Dye
Categories
Funding
- National Natural Science Foundation of China [51521006, 51579095, 51378190, 21675043]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan Province University Innovation Platform Open Fund Project [14K020]
- Interdisciplinary Research Funds for Hunan University
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
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Treating dye wastewater by membrane filtration technology has received much attention from researchers all over the world, however, current studies mainly focused on the removal of singly charged dyes but actual wastewater usually contains dyes with different charges. In this study, the removal of neutral, cationic and anionic dyes in binary or ternary systems was conducted by using zirconium-based metal organic frameworks loaded on polyurethane foam (Zr-MOFs-PUF) membrane. The Zr-MOFs-PUF membrane was fabricated by an in-situ hydrothermal synthesis approach and a hot-pressing process. Neutrally charged Rhodamine B (RB), positively charged Methylene blue (MB), and negatively charged Congo red (CR) were chosen as model pollutants for investigating filtration performance of the membrane. The results of filtration experiments showed that the Zr-MOFs-PUF membrane could simultaneously remove RB, MB, and CR not only from their binary system including RB/MB, RB/CR, and MB/CR mixtures, but also from RB/MB/CR ternary system. The removal of dyes by Zr-MOFs-PUF membrane was mainly attributed to the electrostatic interactions, hydrogen bond interaction, and Lewis acid-base interactions between the membrane and dye molecules. The maximum removal efficiencies by ZrMOFs-PUF membrane were 98.80% for RB at pH 7, 97.57% for MB at pH 9, and 87.39% for CR at pH approximate to 3. Additionally, when the NaCI concentration reached 0.5 mol/L in single dye solutions, the removal efficiencies of RB, MB, and CR by Zr-MOFs-PUF membrane were 93.08%, 79.52%, and 97.82%, respectively. All the results suggested that the as-prepared Zr-MOFs-PUF membrane has great potential in practical treatment of dye wastewater. (C) 2018 Elsevier Inc. All rights reserved.
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