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RISS 인기검색어
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- 저자 : Aravindakumar, Charuvila T. (검색결과 3 건)
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Removal of beta blockers using polyelectrolyte monolayered membrane and its antifouling performance
Jain Maria Thomas,C.T. Aravindakumar,Usha K. Aravind 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
Surfaces of commercially available polyamide membranes were modified by polyelectrolyte monolayerby dip coating method. The formation of monolayered membranes was confirmed by spectroscopic andmicroscopic methods. The membrane performance is evaluated for the removal of beta blockers (β-blockers) from aqueous solution and resulted in nearly complete (98%) removal. Also, in presence of ions,surfactant and humic acid above 85% of removal was observed. For atenolol (ATL), metoprolol (MPL) andtimolol (TML) the rejection was very poor at acidic pH values and from pH 6 onwards nearly completeremoval was observed. The removal percentage was unaltered for propranolol (PPL) and labetalol (LTL). Areduction in rejection percentage was observed for PPL (42%) and LTL (17%) respectively as theconcentration of the salt increases from 0 M to 0.2 M while the others were almost completelypermeated. The adsorbed β-blockers could be desorbed from the membrane (ATL (86%), MPL (93%), TML(83%), PPL (44%) and LTL (32%)). The performance of the membrane was also evaluated by continuouslyexposing it to the feed solution. The removal was found to be decreasing on increasing the feed volume atsteps. The performance was further improved by the inclusion of chitosan/poly(styrene sulfonate) (CHI/PSS) multilayers.
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Rayaroth, Manoj P.,Lee, Chung-Seop,Aravind, Usha K.,Aravindakumar, Charuvila T.,Chang, Yoon-Seok Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.315 No.-
<P><B>Abstract</B></P> <P>Implications of sulfidized Fe<SUP>0</SUP> (nFe/FeS) for the abatement of pollutants of various categories are widely established. In this study, degradation of one of the major organic pollutants, benzoic acid (BA), has been performed using persulfate activated with nFe/FeS. Complete degradation of BA and its transformed product, hydroxybenzoic acid, was observed within 6min. When the degradation was performed at alkaline pH, the degradation decreased to 8% in the case of Fe<SUP>0</SUP>, but nFe/FeS still showed 100% degradation after 60min. Iron dissolution and persulfate decomposition in the presence of scavengers showed that both sulfate and hydroxyl radicals were involved in the Fe<SUP>0</SUP>-persulfate system and that the hydroxyl radicals were the major species in the nFe/FeS-persulfate system. The major degradation pathway of benzoic acid was hydroxylation followed by complete mineralization, as supported by the practical removal of total organic carbons (more than 75% within 15min). The observed results are promising in using persulfate activated by nFe/FeS for the remediation of various micro-pollutants from a multitude of water sources.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sulfidized Fe<SUP>0</SUP> (nFe/FeS)-activated persulfate is reported here for the first time. </LI> <LI> Fast degradation of benzoic acid was observed using nFe/FeS-activated persulfate. </LI> <LI> The degradation efficiency followed the order of nFe/FeS>Fe<SUP>0</SUP> ≫>Fe<SUP>2+</SUP>. </LI> <LI> nFe/FeS is more useful in a wide range of pH compared with Fe<SUP>0</SUP>. </LI> <LI> Better mineralization was found as another advantage of nFe/FeS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Naveen S. Lal,John Richard Thomas,Sumith Satheendran,Abin Varghese,Usha K. Aravind,C.T. Aravindakumar 대한공간정보학회 2020 Spatial Information Research Vol.28 No.6
Air quality disturbance zones of the Greater Cochin region (Kerala, India) for the years 2014, 2015, 2016 and 2017 along with air quality assessment and dispersion modelling using in situ measurements and mathematical models, have been investigated in this report. Landsat-8 satellite with OLI and TIRS sensors on board were used for the analysis. The ground based in situ measurements (pollutant parameters) were also obtained from the Kerala state pollution control board. Zonal statistics analysis was performed in various combinations especially air quality disturbance zones with respect to land use/land cover and administrative units for various years. The air quality disturbance zone index (AQDZI) values observed indicated that 38.16% of the study area in 2014 belonged to very good category, 22.94% to good category, 32.37% to moderate category and 6.53% to poor category. In 2015, 56.78% of study area belonged to very good category and 43.221% to good category while in the year 2016 very good category of AQDZI values occupied an area of 45.284% and good category AQDZI values occupied an area of 54.72%. In 2017, 99.834% of the study area belonged to good category and 1.233% to moderate category. Results obtained from zonal statistics revealed that the poor air quality was observed in built up area and good air quality at rubber plantation in all the four selected years. In the case of administrative units, Kochi Corporation experienced poor air quality during all the years studied and Mulanthuruthy grama-panchayath experienced good air quality during most of the years except in 2016.
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