Back to Search
Start Over
Tailoring the topology of ZIF-67 metal-organic frameworks (MOFs) adsorbents to capture humic acids.
- Source :
-
Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2024 Jan 01; Vol. 269, pp. 115854. Date of Electronic Publication: 2023 Dec 27. - Publication Year :
- 2024
-
Abstract
- Chlorination is a versatile technique to combat water-borne pathogens. Over the last years, there has been continued research interest to abate the formation of chlorinated disinfection by-products (DBPs). To prevent hazardous DBPs in drinking water, it is decided to diminish organic precursors, among which humic acids (HA) resulting from the decomposition and transformation of biomass. Metal-organic frameworks (MOFs) such as zeolitic imidazolate frameworks (ZIFs) have recently received tremendous attention in water purification. Herein, customized ZIF-67 MOFs possessing various physicochemical properties were prepared by changing the cobalt source. The HA removal by ZIF-67-Cl, ZIF-67-OAc, ZIF-67-NO <subscript>3</subscript> , and ZIF-67-SO <subscript>4</subscript> were 85.6%, 68.9%, 86.1%, and 87.4%, respectively, evidently affected by the specific surface area. HA uptake by ZIF-67-SO <subscript>4</subscript> indicated a removal efficiency beyond 90% in 4 <pH< 8, while a drop was observed when pH reached ∼10. A parametric study revealed that the adsorption efficiency was a function of dosage; moreover, the removal percentage remained > 90% after 60 min mixing the solution with 0.3 g L <superscript>-1</superscript> ZIF-67-SO <subscript>4</subscript> . Notably, an acceptable removal performance (∼72.3%) was obtained even at HA concentrations up to 100 mg L <superscript>-1</superscript> . The equilibrium data fitted well with the isotherm models in the order of Langmuir> Hill > BET> Khan > Redlich-Peterson> Jovanovic> Freundlich > and Temkin. The maximum adsorption capacity q <subscript>m</subscript>  for HA uptake by ZIF-67-SO <subscript>4</subscript> was 175.89 mg g <superscript>-1</superscript> , well above the majority of adsorbents. The pseudo-first-order model described the rate of HA adsorption by time. In conclusion, ZIF-67-SO <subscript>4</subscript> presented promising adsorptive properties against HA. Further studies would be needed to minimize cobalt leaching from the ZIF-67-SO <subscript>4</subscript> structure and improve its reusability safely, to ensure its effectiveness and the economy of adsorption system.<br />Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
Details
- Language :
- English
- ISSN :
- 1090-2414
- Volume :
- 269
- Database :
- MEDLINE
- Journal :
- Ecotoxicology and environmental safety
- Publication Type :
- Academic Journal
- Accession number :
- 38154210
- Full Text :
- https://doi.org/10.1016/j.ecoenv.2023.115854