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- 저자 : Garg Renu (검색결과 3 건)
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Renuka Garg,Renu Gupta,Ajay Bansal 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3
Removal of Bisphenol A (BPA) from surface waters is necessary before consumption. A study, therefore, was conducted to degrade BPA using graphene oxide, ZnO and ZnO decorated on graphene oxide. Hydrothermal method was used to synthesize the hybrid nano-catalysts. 99.5% photocatalytic degradation of BPA was achieved by using ZG0.6 nano-catalyst in comparison to bare ZnO and GO nano-catalysts at natural pH of 7.5 in 60 min of UV irradiation. The higher photocatalytic activity of ZG0.6 nano-catalyst could be ascribed to an improved surface area, efficient charge separation as well as the decreased recombination rate of electron-hole charge carriers, leading to the generation of highly reactive hydroxyl radicals for the degradation of BPA. Photocatalytic degradation followed LangmuirHinshelwood model with pseudo-first-order kinetics. The degradation mechanism is also detailed with identification of reaction intermediates. Degradation pathways, based on LCMS analysis, have been proposed. The pathways revealed the formation of smaller by-products such as phenol, hydroquinol and (Z)-3-hydroxyacrylaldehyde. The developed ZG0.6 nano-catalyst were found to be reusable for consecutive five runs without much loss in the activity and have the advantage of effective charge separation.
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Evaluation of Delhi Population Based Cancer Registry and Trends of Tobacco Related Cancers
Yadav, Rajesh,Garg, Renu,Manoharan, N,Swasticharan, L,Julka, PK,Rath, GK Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.6
Background: Tobacco use is the single most important preventable risk factor for cancer. Surveillance of tobacco-related cancers (TRC) is critical for monitoring trends and evaluating tobacco control programmes. We analysed the trends of TRC and evaluated the population-based cancer registry (PBCR) in Delhi for simplicity, comparability, validity, timeliness and representativeness. Materials and Methods: We interviewed key informants, observed registry processes and analysed the PBCR dataset for the period 1988-2009 using the 2009 TRC definition of the International Agency for Research on Cancer. We calculated the percentages of morphologically verified cancers, death certificate-only (DCO) cases, missing values of key variables and the time between cancer diagnosis and registration or publication for the year 2009. Results: The number of new cancer cases increased from 5,854 to 15,244 (160%) during 1988-2009. TRC constituted 58% of all cancers among men and 47% among women in 2009. The age-adjusted incidence rates of TRC per 100,000 population increased from 64.2 to 97.3 among men, and from 66.2 to 69.2 among women during 1988-2009. Data on all cancer cases presenting at all major government and private health facilities are actively collected by the PBCR staff using standard paper-based forms. Data abstraction and coding is conducted manually following ICD-10 classifications. Eighty per cent of cases were morphologically verified and 1% were identified by death certificate only. Less than 1% of key variables had missing values. The median time to registration and publishing was 13 and 32 months, respectively. Conclusions: The burden of TRC in Delhi is high and increasing. The Delhi PBCR is well organized and generates high-quality, representative data. However, data could be published earlier if paper-based data are replaced by electronic data abstraction.
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Mineralization and degradation of 4-Nitrophenol using homogeneous Fenton oxidation process
Minz Sudha,Gupta Renu,Garg Sangeeta 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.3
The mineralization analysis of wastewater is important for the growth of flora and fauna. The mineralization along with the degradation of 4-NP has been studied using homogeneous Fenton oxidation process. The mineralization of 4-NP has been reported in terms of chemical oxygen demand (COD) removal % and total organic carbon (TOC) removal %. The main parameters that affect the mineralization and degradation of 4-NP i.e. initial pH (1 – 5), reaction time (0 – 60 min), the concentration of hydrogen peroxide (1 – 5 mM) and concentration of ferrous ions (0.05 – 0.5 mM) have been optimized. In the present study, optimum reaction conditions for mineralization and degradation of 4-NP are observed at pH 3, 4 mM of H₂O₂ concentration, 0.2 mM of Fe2+ concentration and in 40 min of reaction time. At the optimum condition, COD removal and TOC removal were 50% and 60.3%, respectively along with 93.6% of 4-NP degradation. At optimized conditions, intermediate products obtained after homogeneous degradation of 4-NP were identified based on LC-MS spectra analysis. The degradation of 4-NP followed, second order reaction rate. The present study showed the higher degradation and mineralization of 4-NP as compared to available studies on 4-NP.
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