RNS Institute of Technology is a private engineering college and is located in Bangalore, India. The college is affiliated to Visvesvaraya Technological University. Rama Nagappa Shetty Institute of Technology (RNSIT) established in the year 2001, is the brain-child of the Group Chairman, Dr. R.N. Shetty. Several educational institutions are run by the R. N. Shetty Trust, with RNSIT one amongst them..
A double-slope solar still (DSS) is considered one of the most promising techniques in desalination plants. However, the DSS has low productivity. In this study, the performance of a DSS has been enhanced by utilizing natural wick materials (bamboo, banana, and pineapple fibers) and nano-enhanced phase change materials (nano-PCM), which are made of graphene oxide (GO) and Glauber salt (GS). Among the three wick materials, the DSS with bamboo fiber and nano-PCM has the highest freshwater productivity of 3.41 L/day, compared to banana and pineapple fibers, which have 3.07 L/day and 2.86 L/day, respectively. In addition, the DSS with bamboo fiber has the highest energy efficiency of 44.33%, exergy efficiency of 2.61%, and evaporative heat transfer coefficient of 109.51 W/m2K. Furthermore, the economic analysis of the proposed system has shown that the cost of the distilled water produced by the DSS is $0.017, and the payback period is 5.2 months. In addition, the analysis has shown that the DSS has the highest sustainability index of 1.027 and CO2 mitigation potential of 10.15 tons.
The Phosphor Ba1-xMoO4:xEu(3+) (0.00 <= x < 0.09) prepared by low-cost solution combustion method were in a space group of I4(1)/a and crystalized in tetragonal phase. The intensity of photoluminescence was found to be maximum for the transition D-5(0)-> F-7(2) (615 nm) at an excitation wavelength of 394 nm with CIE color coordinates (0.6525, 0.3471) making it a potentially useful substance for red phosphor materials. Electrochemical impedance spectroscopy (EIS) research has demonstrated that the decreased charge transfer resistance of Ba1-xMoO4:xEu(3+) (0.00 <= x < 0.09) is responsible for their improved behaviour. When lithium was used as an analyte, Ba1-xMoO4:xEu(3+) (0.00 <= x < 0.09) demonstrated improved sensitivity in cyclic voltammetry studies at various scan rates. Further, the use of Ba1-xMoO4:xEu(3+) (x = 0.07) powder as a dusting agent in fingerprint applications suggest that nanophosphor-based techniques offer a promising advancement for non-destructive and high-resolution fingerprint imaging across diverse surfaces.
ABSTRACT Modern industries rely heavily on polymeric materials for their performance advantages, yet rising sustainability goals highlight the increasing unsustainability of linear, disposal‐based production models due to persistent waste streams and environmental impacts. Therefore, design for recyclability (DfR) has emerged as a key strategy for circular polymer systems by embedding end‐of‐life considerations at the earliest stages of product design. Recycling efficiency and economic viability are strongly influenced by design parameters such as monomer architecture, additive selection, product configuration, and compatibility with existing recycling infrastructure. This review specifically focuses on mechanical recycling and depolymerization‐based chemical recycling, where material design plays a critical role in determining recyclability and value retention. While other circular strategies such as biodegradation and energy recovery are important, they are beyond the primary scope of this review. Recent advances in polymer science including depolymerizable polymers, dynamic covalent bonds, and reversible crosslinked systems enable improved recyclability without sacrificing performance. Complementary process and system level approaches, including closed‐loop recycling, industrial symbiosis, digital material tracking, and certification schemes, are essential for successful industrial implementation. This review surveys DfR strategies spanning material and process scales and discusses their potential to enable scalable circular polymer systems.
This study evaluates the corrosion inhibition performance of a newly synthesized organic compound, 2-amino4-methoxy-6-methyl (benzylidene) 1,3,5-triazine (AMMBT), which is non-toxic and exhibits medicinal relevance, for the protection of mild steel in 1 M hydrochloric acid (HCl) medium using both experimental and computational approaches. The inhibition efficiency of AMMBT was assessed through gravimetric analysis and electrochemical techniques, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that inhibition efficiency increases with concentration, reaching a maximum of 89% at 100 mu M. Polarization studies indicate that AMMBT behaves as a mixed-type inhibitor. Temperature-dependent studies (303-333 K) reveal that adsorption follows the Langmuir isotherm and proceeds via an exothermic process. Surface characterization using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) confirms the formation of a protective adsorbed film on the mild steel surface. Density functional theory (DFT) calculations suggest that both neutral and protonated forms of AMMBT interact strongly with the metal surface through lone pair electrons on heteroatoms (N and O) and it-electrons of the conjugated system.
Developing multifunctional materials capable of addressing both energy storage and environmental remediation challenges is crucial for achieving sustainable technologies. In this work, LaMnO3 nanoparticles (LMO NPs) doped with varying concentrations of Fe3+ (0-11 mol%) were synthesized via a combustion route using Papaya leaf extract as a natural fuel. Structural, morphological, and chemical characterization through XRD, electron microscopy, BET surface analysis, UV-Vis DRS, Raman, FTIR, and XPS confirmed the formation of phase-pure orthorhombic perovskites with tunable features induced by Fe3+ incorporation. Electrochemical studies demonstrated that the electrode with 11 mol% Fe3+ substitution delivered a specific capacitance (Csp) of 112.67 F/g, a power density (PD) of 266 W/kg, and an energy density (ED) of 1.22 Wh/kg, indicating improved supercapacitor performance. Photocatalytic experiments under natural sunlight revealed efficient degradation of malachite green (MG), achieving 98.09% degradation within 120 min. The observed improvements are attributed to Fe3+ induced mixed-valence states, enhanced charge separation, and an increased density of accessible surface-active sites. These findings highlight Fe3+ doped LMO as a robust multifunctional material with strong potential for high-performance energy storage and sustainable wastewater remediation.
