![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
ABSTRACT
In this work, we employ an eco-friendly and highly efficient method for the successful removal of anionic azo dye (CR) using emerging Ni/Co-BTC hollow Metal-Organic Frameworks (MOFs). The MOFs was developed via a solvothermal synthesis method. Various kinetic models, adsorption capacities, isotherms (Langmuir and Freundlich), and thermodynamic stability assessments were used to predict the adsorption mechanism and the types of interactions present between CR dyes and Hollow MOFs. Our findings suggest that the adsorption process follows Freundlich isotherm, with PSO kinetic models indicating chemisorption and a maximum Langmuir adsorption capacity of 168.03 mgg−1. We observed a removal efficiency of 74% in neutral medium and 85% in acidic medium. Thermodynamic studies reveal the spontaneity of the process with endothermic enthalpy, attributed to the hydrogen bonding and electrostatic interactions between the dye molecule and the adsorbent. Furthermore, to investigate practical applicability, we conducted studies in real water and dye mixtures. All studies demonstrated that the prepared Ni/Co-BTC hollow MOFs show promising potential adsorbents for the CR dye removal from the wastewater, owing to their high efficiency and reusability.
GRAPHICAL ABSTRACT
Highlights
Adsorption of anionic dyes in hollow MOFs
High adsorption capacity obtained from adsorption isotherm studies
High efficiency for Congo red and mixture of dyes
Adsorption process is highly spontaneous and endothermic
Acknowledgments
The authors would like to express their gratitude to the Council of Scientific & Industrial Research- University Grant Commission (CSIR- UGC), Government of India, for providing research fellowship to Shalu Goyal, and to the Institute of Eminence (IoE), University of Delhi for financial support. We would also like to acknowledge the University Science Instrumentation Centre (USIC) at the University of Delhi for providing the necessary instrumentation facilities.
Disclosure statement
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.
Supplemental data
Supplemental data for this article can be accessed online at https://doi.org/10.1080/01496395.2024.2366901
Data availability statement
Data would be made available on the request.
Credit authorship contribution statement
Shalu Goyal: Conceptualization, writing original Draft, Formal analysis, Investigation, Pamthingla Ragui: Formal Analysis, Investigation, Anita Yadav: Formal analysis and Editing, Swati Rani: Formal analysis, Poonam Dwivedi: Investigation and Rakesh Kumar Sharma: Supervision, Formal Analysis, Editing.