Browsing by Author "Narzari, R."

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A comprehensive study to understand removal efficiency for Cr6+ using magnetic and activated biochar through response surface methodology
(Springer Science and Business Media Deutschland GmbH, 2024) Narzari, R.; Poddar, M.K.; Bordoloi, N.; Sarmah, A.K.; Kataki, R.
This study highlights the advantageous effect of magnetic biochar (MLC) over conventional activated biochar (ALC) used for chromium adsorption from the aqueous solution. The synthesis of MLC was done using an invasive noxious weed “Lantana camara” with impregnation of iron chloride (FeCl3) on biochar surface at 25 °C. The optimum process parameters such as pH (3.01), adsorbent concentration (1.82 g/L), and adsorbate amount (161.23 mg/L) for the maximum chromium adsorption have been calculated using response surface methodology coupled with central composite design. Successful impregnation of iron on biochar with pre and post adsorption analysis has been confirmed using various characterization techniques viz. vibrating sample magnetometry (VSM), field emission scanning electron microscope (FESEM-EDX), Fourier transform infrared (FTIR), and X-ray diffraction (XRD). Among various adsorption isotherms studied, Langmuir isotherm best fits the pseudo-second-order kinetic model for analysis of actual adsorption behavior of Cr6+ ions on ALC and MLC surfaces. Biochar MLC exhibited the maximum chromium adsorption capacity of 102.03 mg/g as compared to low chromium adsorption of 94.69 mg/g using conventional ALC biochar. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021.
Effects of green manufacturing and technological innovations on sustainable development
(Elsevier, 2025) Poddar, M.K.; Soman, V.; Narzari, R.
This chapter offers a concise exploration of the potent link between green manufacturing technologies and the sustainable development goals (SDGs). It highlights how eco-friendly practices in the synthesis of nanoparticles (NPs) hold the potential to drive sustainable development. Through the adoption of green methods such as plant-based NP synthesis, microorganism and microalgae utilization, we elucidate their pivotal role in advancing SDGs related to clean energy, responsible consumption, healthcare, clean water, and the conservation of the ecosystem. The environmental hazards caused as a result of conventional synthesis methods of NPs have also been discussed in brief. This chapter also throws light on the versatile applications of NPs, from renewable energy solutions to sustainable materials. It serves as a realistic guide that emphasizes the real-world impact of green manufacturing and innovation in molding a sustainable future. © 2025 Elsevier Inc. All rights reserved.
Transitions toward sustainable E-waste management plans
(Elsevier, 2023) Sahota, S.; Poddar, M.K.; Narzari, R.
The last few decades have witnessed the advancement in electrical and electronic appliances and their applications have revolutionized human’s daily life. However, at the same time excessive electronics wastes (E-waste) and hazardous materials associated with this E-waste have caused serious concerns to the environment and all living organisms. Sustainable E-waste management to control and mitigate the E-waste generation and its conversion into value-added products are of utmost importance to protect the environment and healthy lifestyle. This chapter discusses the overview of E-waste generation and its impact on the environment and humans. The chapter also covers the worldwide technological aspects being used to achieve an effective E-waste management system. Various E-waste management models and government policy for successful implementation of these models in most of the developed and developing countries are also discussed. The studies revealed that Switzerland is the first country that successfully implemented the sustainable E-waste management system with recycling of approximate 11kg/capita of Waste Electrical and Electronic Equipment against a targeted value of 4kg/capita set by European unions. In the end, the challenges and future perspectives to achieve sustainable E-waste management are also discussed. © 2023 Elsevier Inc. All rights reserved.