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789 results on '"Manickam, Sivakumar"'

173. The Sonocatalytic Activation of Persulfates on Iron Nanoparticle Decorated Zeolite for the Degradation of 1,4-Dioxane in Aquatic Environments.

Author

Malkapuram, Surya Teja, Sonawane, Shirish Hari, Rayaroth, Manoj P., Seepana, Murali Mohan, Manickam, Sivakumar, Karczewski, Jakub, and Boczkaj, Grzegorz

Subjects
NANOPARTICLES, PERSULFATES, STABILIZING agents, DIOXANE, CHEMICAL industry, ZEOLITES, MICROPOLLUTANTS
Abstract

In the chemical industry, 1,4-diethylene dioxide, commonly called dioxane, is widely used as a solvent as well as a stabilizing agent for chlorinated solvents. Due to its high miscibility, dioxane is a ubiquitous water contaminant. This study investigates the effectiveness of catalyst- and ultrasound (US)-assisted persulfate (PS) activation with regard to degrading dioxane. As a first step, a composite catalyst was prepared using zeolite. A sonochemical dispersion and reduction method was used to dope zeolite with iron nanoparticles (FeNP/Z). In the subsequent study, the reaction kinetics of dioxane degradation following the single-stage and two-stage addition of PS was examined in the presence of a catalyst. Using GC-MS analysis, intermediate compounds formed from dioxane degradation were identified, and plausible reaction pathways were described. Upon 120 min of sonication in the presence of a catalyst with a two-stage injection of PS, 95% 100 mg/L dioxane was degraded. Finally, the estimated cost of treatment is also reported in this study. Sonolytically activated PS combined with a FeNP/Z catalyst synergizes the remediation of biorefractory micropollutants such as dioxane. [ABSTRACT FROM AUTHOR]

Published
2023
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189. Geospatial distribution and health risk assessment of groundwater contaminated within the industrial areas: an environmental sustainability perspective

Author

Khan, Roohul Abad, primary, Khan, Nadeem A., additional, El Morabet, Rachida, additional, Alsubih, Majed, additional, Qadir, Abdul, additional, Bokhari, Awais, additional, Mubashir, Muhammad, additional, Asif, Saira, additional, Cheah, Wai Yan, additional, Manickam, Sivakumar, additional, Klemeš, Jiří Jaromír, additional, and Khoo, Kuan Shiong, additional

Published
2022
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190. Physiological and biochemical evaluation of high anthocyanin pigmented tea (Camellia sinensis L. O. Kuntze) germplasm for purple tea production

Author

Patel, Pradeep Kumar, primary, Siddiqui, Shahida Anusha, additional, Kuča, Kamil, additional, Sabhapondit, Santanu, additional, Sarma, Rupak, additional, Gogoi, Boby, additional, Singh, Shobhit Kumar, additional, Bordoloi, Ranjeet Kumar, additional, Saikia, Jayanta Kumar, additional, Gogoi, Romen Chandra, additional, Bhardwaj, Kanchan, additional, Yang, Jie, additional, Tao, Yang, additional, Manickam, Sivakumar, additional, and Das, Buddhadeb, additional

Published
2022
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192. Cu(II) ions removal from wastewater using starch nanoparticles (SNPs): An eco‐sustainable approach.

Author

Hakke, Vikas S., Landge, Vividha K., Sonawane, Shirish H., Babu, G. Uday Bhaskar, Manickam, Sivakumar, and Boczkaj, Grzegorz

Subjects
COPPER, FIELD emission electron microscopes, IONS, STARCH, IRRADIATION, X-ray photoelectron spectroscopy, LEAD removal (Sewage purification), COPPER isotopes
Abstract

The complex structured starch particles were reduced to the nanoscale size range through hydrolysis utilizing low concentration acid assisted by ultrasound irradiation. The synthesized starch nanoparticles (SNPs) were characterized by transmission electron microscopy (TEM), Fourier‐transform infrared (FTIR), and X‐ray diffraction (XRD) techniques. The synthesized SNPs possessed surface activated entities, as many cationic functional groups were confirmed through the FTIR spectrum. Also, these SNPs were effectively utilized to separate heavy Cu metal ions from the synthetic ion solution. The SNPs were characterized using field emission scanning electron microscope (FESEM), X‐ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) analysis for the surface modification after the adsorption process. The weak electrostatic interaction between the SNP surface and Cu ion was confirmed by the XPS spectrum and energy‐dispersive X‐ray spectroscopy. The maximum efficiency of Cu ions removal was about 93% at an optimal pH 5 and 25 mg/ml dosage. The adsorption equilibrium was obtained in 60 min. The nitrogen isotherm BET analysis of SNPs after adsorption shows a higher specific surface area of 18.552 m2/g, attributed to the interaction and presence of Cu ions on the SNP surface. The process feasibility was validated by the Langmuir isotherm model. The process exhibits pseudo‐second‐order adsorption kinetics and follows the Langmuir isotherm. The RL predicted by the Langmuir isotherm mechanism is 0.017, implying favourable adsorption. The process is reproducible and allows for the separation of heavy metal ions from the wastewater through biosorption effectively. [ABSTRACT FROM AUTHOR]

Published
2023
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