http://hdl.handle.net/2080/17 2026-03-11T05:47:26Z http://hdl.handle.net/2080/5719 Title: Engineering Breakthroughs in Environmental Remediation: The CF-MF Approach Authors: Dash, Adyashakti; Saha, Partha Abstract: The accelerating pace of industrialization and urbanization have intensified water pollution threats from oil spills and organic effluents, critically affecting the aquatic ecosystems. Addressing this urgent challenge calls for innovative solutions that are efficient, eco-friendly, and cost-effective. Three dimensional porous sorbents have become a ground-breaking method for oil recovery, drawing substantial attention from both academia and industry. In this work, we developed a superhydrophobic/superoleophilic melamine formaldehyde (MF) sponge modified with catechol formaldehyde via polycondensation, followed by dip-coating of the sponge and heat treatment in controlled atmosphere, resulting in an effective sorbent for oil-water separation. Characterization techniques such as XRD, FTIR, Raman spectroscopy, FESEM, and EDS verified the successful surface modification and the formation of the CF@MF sponge. The CF@MF sponge demonstrates outstanding superhydrophobicity with a water contact angle of 172°, highlighting its excellent repellency to water. For oil in air and oil in water, the contact angles are ~91° and 0°, indicating strong oil affinity. It achieves ~98% separation efficiency in DI water as well as artificial seawater. Impressively, the sponge maintains a good oil absorption capacity after 20 cycles of repeated sorption and mechanical squeezing, showcasing its durability and reusability. Our investigation establishes CF@MF sponge as an advanced solution for large-scale oil spill remediation. The synthesis process is efficient, costeffective, and scalable for industrial production. Further, the CF resin and CF@MF sponge were explored for the removal of methylene blue dye with ~98% efficiency. The abovementioned findings have ample rationale to believe that the strategy adopted herein will provide an easy and environmentally benign method for synthesizing porous sorbents for wastewater treatment in future. Description: Copyright belongs to the proceeding publisher. 2026-02-01T00:00:00Z http://hdl.handle.net/2080/5718 Title: Impact of Washing On Performance and Characteristics of Clay-Based Geopolymer Adsorbent Authors: Satpathy, Sourav Ranjan; Bhattacharyya, Sunipa Abstract: The steep rise in human population and their exploitation of precious natural resources such as water have degraded the quality of ground and surface water over the years, and this is a matter of great concern. Dye pollution is a critical problem affecting water quality and aquatic ecosystems worldwide. Water treatment methods, such as clay-based adsorbents, have garnered significant attention due to their abundance, ready availability, simple synthesis processes, and potential for largescale production. This research investigates clay-based geopolymer adsorbents for removing cationic dyes from aqueous systems, focusing on the significance of the washing process on the properties and performance of the adsorbent. The adsorbents were prepared using sodium metasilicate and sodium hydroxide as alkali activators. The prepared adsorbents are characterized using X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier-transform infrared spectrometry, Raman spectroscopy, Field emission scanning electron microscopy, energy dispersive X-ray analysis, and zeta potential to understand their underlying science. The samples were washed and compared to evaluate the effects of washing on their properties and adsorption performance. A batch adsorption study was conducted on the prepared adsorbent samples using UV-visible spectroscopy to evaluate their dye removal efficiency. Methylene Blue, Crystal Violet, Rhodamine B, and Methyl Orange dyes were used as pollutants in the adsorption study. Description: Copyright belongs to the proceeding publisher. 2026-02-01T00:00:00Z http://hdl.handle.net/2080/5717 Title: Simulation and Hardware Realization of Open-loop SPS Controlled SiC-based DAB Converter for Battery Charging Authors: Satpathy, Saswat; Saivivek, Medipally; Katru, Vikash Varma; Pattnaik, Monalisa Abstract: The use of SiC MOSFETs enables faster switching, reduced conduction losses and higher breakdown voltage, making them ideal for high-frequency isolated power conversion. This paper presents the design and simulation of a silicon carbide (SiC) based dual active bridge (DAB) converter for electric vehicle (EV) battery charging applications. The converter operates at a switching frequency of 50 kHz, interfacing a 400 V DC source with a 60 V battery load. The power transfer is obtained by using single phase-shift (SPS) control strategy. A detailed analysis is developed to investigate the influence of leakage inductance and phase-shift angle on power transfer capability. Simulation results or a 5 kW, 400 V/60 V EV battery are presented to justify its compatibility in battery chargers. A hardware prototype of a DAB using SiC-based H-bridges interconnected via a highfrequency transformer and a leakage inductor is implemented for a resistive load. The SPS control is implemented using TMS320F28379D microcontroller to control the power transfer in the DAB converter. This work can be further extended in both simulation/hardware to charge EV battery in constant currentconstant Voltage (CC-CV) charging mode using an advanced closed-loop control technique, which is essential for optimizing battery charging performance. Description: Copyright belongs to the proceeding publisher. 2026-02-01T00:00:00Z http://hdl.handle.net/2080/5716 Title: Performance Analysis of a Direct Power Controlled VSC for PMSG based Wind Energy Conversion System Authors: K, Moganapriya; Srungavarapu, Gopalakrishna; Pattnaik, Monalisa Abstract: Small-scale Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion System (WECS) widely uses diode rectifier for conversion from AC to DC due to their affordability and ease of use. But, this structure results in high current harmonics and poor power factor on the source side. Direct Power Control (DPC) is a well-established control approach for pulse width modulation (PWM) converter to obtain sinusoidal current waveform and unity power factor (UPF) at the source side. DPC for AC grid-connected converter is extensively reported in the literature, but its use for variable-speed AC machine is still relatively limited. DPC is particularly challenging to implement for machine-side converter (MSC) of variable-speed generator because it involves accurate measurement of instantaneous voltage, current, and phase angle under continuously changing frequency. Despite these difficulties, implementation of DPC for the MSC in WECS is very attractive as it provides stable DC-link control without the need for extra converter stages. In this research, the efficacy of table-based DPC, which is commonly used for constant source frequency, is tested for variable voltage source that emulates the output characteristics of variable speed generator. The converter’s performance is tested in two different ways: (1) by changing the source voltage/frequency in a linear way and (2) by changing source voltage/frequency randomly. Both cases are tested under two different conditions: one with a constant load and the other with stepwise load change for the performance of DC-link voltage regulation, rise time, ripple, and power factor. The simulation results confirm that the model effectively regulates DC-link voltage at 180 V and maintains sinusoidal source current with UPF during the changes in source voltage/frequency and load. Description: Copyright belongs to the proceeding publisher. 2026-02-01T00:00:00Z