Browsing by Author "Kamlendra Awasthi"

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Green Solution for Heavy Metal Removal: Utilizing Banana Peel Waste as a Sustainable and Effective Adsorbent
(AMG Transcend Association, 2024) Lokesh Kumar Jangir; Apoorva Singh; Abhishek R. Rai; Varad Nagar; Garima Awasthi; Poonam Kumari; Ragini Gupta; Kumud Kant Awasthi; Kamlendra Awasthi; Mahipal Singh Sankhla
In recent years, the discharge of wastewater containing heavy metal ions, such as mercury (Hg), copper (Cu), lead (Pb), and iron (Fe), has posed a significant threat to the environment. Fortunately, research has found that banana peels contain elements, including sulfur, nitrogen, and carboxylic acid, which can effectively attract these heavy metals. The binding properties of banana peels can be retained for over ten cycles, making them a sustainable solution for water purification. This review summarizes recent studies on synthesizing porous carbons using banana peels and their application in water purification. Various synthesis methods and the adsorption mechanisms for removing heavy metals such as Hg, Cu, Pb, and Fe are discussed. Finally, this review concludes with a summary and highlights future prospects for research in this field. © 2024 by the authors.
Metal-Immobilized Micellar Aggregates of a Block Copolymer from a Mixed Solvent for a SERS-Active Sensing Substrate and Versatile Dip Catalysis
(American Chemical Society, 2021) Soumili Daripa; Rampal Verma; Debanjan Guin; Chanchal Chakraborty; Kamlendra Awasthi; Biplab Kumar Kuila
Here, we have reported micellar aggregations of an amphiphilic block copolymer in mixed solvent and their subsequent use as a template for the fabrication of a very dense, tunable metal nanoparticle-decorated surface for SERS and flexible dip catalysis applications. A silver nanoparticle-immobilized layer on silicon substrates shows excellent SERS (surface-enhanced Raman scattering)-based sensing performance for model analyte rhodamine B up to 10-6 M concentration with a well-defined calibration curve. Furthermore, a facile approach to the preparation of metal NP-immobilized BCP membranes as efficient dip catalyst for two model reactions (the reduction of nitrophenol and the Suzuki-Miyaura reaction of iodobenzene or 2,7-diiodofluorene with phenyl boronic acid) is also demonstrated. The Ag NP-decorated film exhibits high efficiency and extensive reusability in a prototype reaction such as the reduction of nitrophenol by sodium borohydride with a very high turnover number, >126 (for a single use), whereas the Pd NP-immobilized film also has a high, ∼100%, reaction yield and extensive reusability and applicable for different aromatic systems. This work provides a new platform for the design and synthesis of a functionalizable, flexible, and highly mechanically stable dip catalyst which is highly demanded in the catalytic production of value-added chemicals and environmental applications such as wastewater treatment. ©