Surface induced growth of ZIF-67 at Co-layered double hydroxide: Removal of methylene blue and methyl orange from water

By M. Nazir, N. Khan, Chao Cheng, S. Shah, Tayyaba Najam, M. Arshad, A. Sharif, Shahbaz Akhtar, A. Rehman. Applied Clay Science, 2020

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Abstract Industrial waste water containing organic pollutants is a universal issue due to its hazardous chemical nature. Fabrication of hybrid mixed-matrix is a typical and powerful approach to create new functionalities that cannot be represented by single-phase materials. In present study, we have reported the in-situ growth of zeolite imidazolate frameworks (ZIF-67) on layered double hydroxides (LDH) to form porous composites to develop materials for removal of methylene blue (MB) and methyl orange (MO). Scanning electron spectroscopy showed a sandwich like structure of composite decorated with polyhedrons of ZIF-67. For comparative studies, ZIF-67 and CoAl-LDH were also synthesized and used for adsorptive removal of MB and MO dyes. Results showed that ZIF-67@CoAl-LDH has good adsorption capacity (qm, 57.24 mg g−1) for methylene blue as compared to LDH (15.04 mg g−1) and ZIF-67 (57.14 mg g−1). Furthermore, ZIF-67@CoAl-LDH also showed good adsorption capacity (qm 180.5 mg g−1) for methyl orange than LDH (32.27 mg g−1) and ZIF-67 (75.58 mg g−1). Also, with 100 min contact time 79.9% MB and with 90 min contact time 72.3% MO was adsorbed by ZIF-67 and it's composite. The equilibrium adsorption data were well fitted by Langmuir model and relatively high correlation coefficient of Langmuir model (R2 = 0.9953 ZIF-67 and 0.9889 ZIF-67@CoAl-LDH) for MB and (R2 = 0.9917 ZIF-67 and 0.9737 ZIF-67@CoAl-LDH) for MO suggesting a mono-layer adsorption of MB and MO on the ZIF-67 and its composite. Further, the ZIF-67 and its composite (ZIF-67@CoAl-LDH) exhibited no obvious loss in MB and MO removal after recycling for four times. The overall results indicate that the as-prepared ZIF-67 and its composite are efficient for removal of dye pollutants containing methylene blue and methyl orange form water.

Subfields: Inorganic Chemistry, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/802c3720a2d12a161b1ed29a9d60b1712ddca606