Insights into methyl orange adsorption behavior on a cadmium zeolitic-imidazolate framework Cd-ZIF-8: A joint experimental and theoretical study
- Title
- Insights into methyl orange adsorption behavior on a cadmium zeolitic-imidazolate framework Cd-ZIF-8: A joint experimental and theoretical study
- Author
- 하산 르가즈
- Keywords
- Adsorption; Organic pollutants; Cadmium-Imidazolate Framework; DFT; Methyl orange
- Issue Date
- 2021-01
- Publisher
- King Saud University
- Citation
- Arabian Journal of Chemistry, v. 14, NO 1, Page. 102897-102897
- Abstract
- Dyeing wastewater from textile industries is often contaminated with chemical pollu-
tants, which causes severe water pollution problems that are challenging to treat. Recently, Zeolitic
imidazolate frameworks (ZIFs) have attracted extensive research interest due to their potential
applications in the removal of pollutants from wastewater. Herein, a Cd- zeolitic-imidazolate
framework (Cd-ZIF-8) was synthesized and used as an adsorbent for the removal of methyl orange
(MO) at different operating conditions. The prepared adsorbent was characterized using a variety
of techniques, including X-ray diffraction (XRD), the Brunauer Emmett Teller (BET) method, FT-
IR and scanning electron microscope (SEM). Its stability after adsorption was confirmed by XRD
and pH tests. The effects of different variables, such as adsorbent dose, initial concentration, pH
and temperature, were investigated to optimize the adsorption process. Adsorption parameters were
determined by applying Langmuir and Freundlich models, and good fitting was observed for the
Langmuir isotherm. Maximum MO adsorption capacities on Cd-ZIF-8 were 93.24 and
145.41 mg g 1 at 30° and 50°, respectively. Possible controlling mechanism and the potential
rate-limiting steps were analyzed using Lagergren’s pseudo-first-order and pseudo-second-order models, and the data were found to follow the pseudo-second-order equation. The prepared mate-
rial was found to have good stability after the adsorption with no release of Cd ions over a wide
range of pH. For a further explanation of the adsorption mechanism, interactions of MO molecules
with the Cd and organic linkers of ZIF-8 were investigated using Density Functional Theory (DFT)
cluster calculations.
- URI
- https://www.sciencedirect.com/science/article/pii/S1878535220304500https://repository.hanyang.ac.kr/handle/20.500.11754/172321
- ISSN
- 1878-5352
- DOI
- 10.1016/j.arabjc.2020.11.003
- Appears in Collections:
- OFFICE OF ACADEMIC AFFAIRS[E](교무처) > Center for Creative Convergence Education(창의융합교육원) > Articles
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