Browsing by Author "Vamsi, E.B."

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    Adsorption of ciprofloxacin antibiotic using chitosan graphene oxide hybrid beads
    (Elsevier Ltd, 2024) Vamsi, E.B.; Reshma, M.; Devatha, C.P.
    The presence of alarming concentrations of Ciprofloxacin (CPFN) antibiotic in surface waters, groundwater, drinking water and treated effluents is a ground-breaking environmental challenge due to its widespread antimicrobial resistance. Most wastewater treatment plants (WWTPs) working on conventional methods are hosting downstream pollution. Hence it is essential to introduce an eco-friendly material that can be integrated with WWTPs to combat CPFN contamination. This research aims to synthesise Chitosan- Graphene oxide (CSN@GO) hybrid beads, which combines the advantage of CSN biocompatibility and GO adsorption capability. Characterization studies are carried out to confirm the formation of nanocomposite by Scanning electron microscopy (SEM), X-ray Diffraction (XRD), and Brunauer-Emmett-Teller (BET). The key parameters, namely adsorbent dosage, pH, and contact time (CT), are systematically modelled and optimised utilising Response Surface Methodology (RSM). The experimental and modelling outcomes revealed the effectiveness of CSN@GO in adsorbing CPFN, with a maximum removal of 67.6 % under optimal conditions (pH = 7 ± 0.2, CT = 114 min, and Dose = 0.5 g/L). The findings underscore the maximum removal obtained at neutral pH, using a low dose of adsorbent in short CT highlights the novelty of this research. Additionally, the versatile nature of CSN@GO makes it a highly reliable material for mitigating emerging contaminants. © 2024 The Authors
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    Green synthesis of mesoporous silica nanoparticles (MSNs) and its application on degradation of triclosan
    (Elsevier Ltd, 2024) Vamsi, E.B.; Devatha, C.P.
    The widespread use of triclosan (TCS) across the globe poses a substantial threat to both human well-being and the ecosystem. This necessitates the development of eco-friendly adsorption techniques to address triclosan contamination in wastewater. This research aims to develop novel eco-friendly synthesis method using Syzygium jambos (SJ) leaf extract to produce small-sized Mesoporous Silica Nanoparticles (MSNs) by varying surfactant to silica ratio. Different ratios such as 1:50, 1:100, and 1:200 (1 mL of tetraethyl orthosilicate (TEOS) is equivalent to cetyltrimethylammonium bromide (CTAB) in mg) were explored without chemical stabilising agents or alcohol diluents. The synthesized materials were named as MSN1, MSN2, and MSN3. Characterisation studies using Field emission scanning electron microscopy (FE-SEM) showed that MSN3 exhibited smallest size of 30 ± 5nm. The physical, chemical and morphological properties were analysed for the materials using X-Ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), Zeta potential (ZP), Brunauer-Emmett-Teller (BET), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FT-IR). Notably, the developed nanomaterial demonstrated noteworthy stability with a ZP of ?33.1 mV and an impressive surface area of 545 m2/g. FT-IR peaks of biosorbent were obtained at 460, 800, and 975 1/cm. This confirms the existence of (Si–O–Si) bonds. The XRD results reveals that it possess amorphous nature of silica without any impurities. N2 adsorption-desorption studies yielded a pore radius of 16.8 Å and volume of pores are 0.890 cc/g indicating its potential as an adsorbent and its utility for material functionalisation. The developed biosorbent exhibited enhanced adsorption properties for removal of triclosan from synthetic wastewater with 76 % removal at 0.5g/L dose of adsorbent. © 2024 The Authors