-Mediated Silver Nanoparticles as Effective and Reusable Adsorbents for the Removal of Methylene Blue from Water.
Aklima A Akhi, Abid Hasan, Nakshi Saha, Sabbir Howlader, Sabonty Bhattacharjee, Kamol Dey, A K M Atique Ullah, Farhana Rumzum Bhuiyan, Ashok Kumar Chakraborty, Umme Sarmeen Akhtar, Md Aftab Ali Shaikh, Benu Kumar Dey, Samiran Bhattacharjee, Sumon Ganguli
Author Information
Aklima A Akhi: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh.
Abid Hasan: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh.
Nakshi Saha: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh.
Sabbir Howlader: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh.
Sabonty Bhattacharjee: Centre for Advanced Research in Sciences (CARS), University of Dhaka, Dhaka 1000, Bangladesh.
Kamol Dey: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh.
A K M Atique Ullah: Nanoscience and Technology Research Laboratory, Atomic Energy Center, Bangladesh Atomic Energy Commission, Dhaka 1000, Bangladesh. ORCID
Farhana Rumzum Bhuiyan: Laboratory of Biotechnology and Molecular Biology, Department of Botany, University of Chittagong, Chattogram 4331, Bangladesh.
Ashok Kumar Chakraborty: Department of Applied Chemistry and Chemical Engineering, Islamic University, Kushtia 7003, Bangladesh.
Umme Sarmeen Akhtar: Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh.
Md Aftab Ali Shaikh: Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka 1205, Bangladesh.
Benu Kumar Dey: Department of Chemistry and Pro-Vice-Chancellor (Academic), University of Chittagong, Chattogram 4331, Bangladesh.
Samiran Bhattacharjee: Centre for Advanced Research in Sciences (CARS), University of Dhaka, Dhaka 1000, Bangladesh. ORCID
Sumon Ganguli: Department of Applied Chemistry and Chemical Engineering, University of Chittagong, Chattogram 4331, Bangladesh. ORCID
Green synthesis of silver nanoparticles (AgNPs) using a plant extract has attracted significant attention in recent years. It is found as an alternative for other physicochemical approaches because of its simplicity, low cost, and eco-friendly rapid steps. In the present study, ()-mediated AgNPs have been shown to be effective bioadsorbents for methylene blue (MB) dye removal (88.1 ± 1.74%) just after 1 h at room temperature in the dark from an aqueous medium for the first time. Langmuir and Freundlich isotherms fit the experimental results having the correlation coefficient constants = 0.9956 and = 0.9838, respectively. From the Langmuir fittings, the maximum adsorption capacity and adsorption intensity were found to be 80.451 mg/g and 0.041, respectively, indicating the excellent performance and spontaneity of the process. Taking both models under consideration, interestingly, our findings indicated a fairly cooperative multilayer adsorption that might have been governed by chemisorption and physisorption, whereas the adsorption kinetics followed the pseudo-second-order kinetics mechanism. The positive and low values of enthalpy (Δ = 4.91 kJ/mol) confirmed that adsorption is endothermic and physical in nature; however, the negative free energy and positive entropy value (Δ = 53.69 J/mol K) suggested that the adsorption is spontaneous. The biosynthesized adsorbent was successfully reused up to the fifth cycle. A proposed reaction mechanism for the adsorption process of MB dye onto -AgNPs is suggested. The present study may offer a novel finding such as an effective and sustainable approach for the removal of MB dye from water using biosynthesized -AgNPs as reusable adsorbents at a comparatively faster rate at a low dose for industrial applications.
References
Mater Sci Eng C Mater Biol Appl. 2015 Apr;49:373-381
[PMID: 25686962]
