http://dspace.dtu.ac.in:8080/jspui/handle/repository/19775 Applied Chemistry Department 2026-04-28T04:03:17Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/22648 Title: HARNESSING ALKALI ASSISTED CALOTROPIS GIGANTEA LEAF AS PHYTOSORBENT FOR REMOVAL OF CRYSTAL VIOLET FROM WATER Authors: RACHANA Abstract: This study investigates using activated Calotropis gigantea (CG) leaves as a natural, cost-effective phytosorbent for the sequestration of crystal violet (CV). The various techniques, including FTIR, XRD, FESEM, DLS, BET, and UV-Vis spectrophotometer, were used to illustrate the efficiency of the phytosorbent. The adsorption behavior of the biosorbent was examined by varying several parameters, such as pH, dye concentration, adsorbent amount, thermodynamics, and equilibrium time. Adsorption isotherms and kinetic models were also fitted. The maximum adsorption capacity of CV on ACG was found to be 111.11 mg/g achieved at 35°C or 308.15 K. The calculated thermodynamic parameters, such as ΔH and ΔS for CV uptake on the adsorbent surface, come out to be 22.397 kJ/mol and -100.25 J/mol/K, respectively. The positive enthalpy change, confirms the endothermic nature of the adsorption process. The negative values of ΔG confirmed the spontaneous nature of the adsorption process. The recyclability of the adsorbent is also good after 4 cycles of regeneration, and the adsorbent has ~80% removal with the real waste water sample. Overall, phytosorbents based on dried Calotropis gigantea leaves demonstrate strong potential as an effective biosorbent for the adsorption of crystal violet via contaminated water. 2025-12-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/22631 Title: ELECTROCHEMICAL BIO-SENSING OF CAFFEIC ACID IN REAL SAMPLES USING Ag@g-C₃N₄ COMPOSITE MATERIAL FOR HIGHLY SELECTIVE AND SENSITIVE APPLICATIONS Authors: AKHTER, MD SHOAIB Abstract: Caffeic acid (CA) is recognized as a phenolic antioxidant with anti-inflammatory, antibacterial, anticarcinogenic and immunomodulatory effects, positioning it as a key representative of hydroxycinnamic acids found in wine. Caffeic acid is detectable in various products including fruits, vegetables, wine, olive oil and coffee. Numerous studies suggest that eating foods rich in CA may provide protection against cancer by inhibiting the production of nitro compounds (including nitrosamines and nitroamides) that are primary contributors to this disease. The goal of this research is to create an enzyme-based biosensor for the detection of caffeic acid utilising silver nanoparticles on a graphitic carbon nitride (Ag@g-C3N4) nanocomposite. The Ag@g-C3N4 nanocomposite was synthesised through chemical methods and applied to an indium tin oxide-coated glass substrate via electrophoretic deposition. The resulting biosensor demonstrates a favourable linear range from 1.0 pM to 1.0 μM with a detection limit of 0.75 pM and displays no significant interference from glucose, ascorbic acid, urea and mixtures. Additional efforts were made to validate the biosensor using real samples from coffee, green tea and black tea. The electrochemical findings indicated that the proposed biosensor is a dependable analytical tool for assessing the quality of caffeic acid in food samples. 2025-06-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/22620 Title: STUDY OF NATURAL COLOURS Authors: MANN, MANSI Abstract: NOT AVAILABLE 2024-06-01T00:00:00Z http://dspace.dtu.ac.in:8080/jspui/handle/repository/22585 Title: SILVER BASED NANOPARTICLE FOR SEED PRIMING OF MEDICINAL AND HERBAL PLANTS Authors: SINGH, RIYA; JOON, URVASHI Abstract: Medicinal plants have been essential to the global evolution of human cultures. Many abiotic and biotic processes affect the growth and development of plants. Seedling establishment and germination are important phases in the plant life cycle and efficient seed germination encourages successful establishment and deep root system of plants. Through the production of various physiological and metabolic changes, priming has been shown to have a noteworthy impact. This review summarises the studies of various medicinal and herbal plants by using nano-priming of seeds. A literature search was conducted with the help of electronic databases like Google Scholar, PubMed, Scopus, Sci Finder, and ONOS. The search was conducted using the keywords Medicinal Plants, Seed priming, nanotechnology, silver nanoparticle, germination. The studies have shown that the use of silver nanoparticles (AgNPs) as nanopriming agent for enhancing seed germination is a step towards sustainable agriculture. This process is suitable for small seed plants. This study gathered information on the seed germination using silver nanoparticles on various medicinal plants. 2025-05-01T00:00:00Z