F-KCW-Department Publications

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Author: search.filters.author.Charulatha SSubject: search.filters.subject.adsorption

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Now showing 1 - 9 of 9
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    ADSORPTION OF COBALT IONS FROM AQUEOUS SOLUTIONS EMPLOYING TREATED FRUIT SHELLS OF TERMINALIA CATAPPA
    (BonfringTM, Gandhigram Rural Institute (Deemed University), 2013) Muthulakshmi Andal N; Charulatha S
    Various modification procedures of Terminalia catappafruit shells were tried for the removal of Co(II) ions from aqueous solutions, where citric acid treatment showed prominent sorption capacity at pH 7 .
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    SORPTION CHARACTERISTICS OF MODIFIED FRUIT SHELL ONTO ZN(II) IONS IN AQUEOUS MEDIA
    (Advances in Applied Research - PSGR Krishnammal College for Women, 2018) Muthulakshmi Andal N; Charulatha S
    The present work was carried out to study the efficiency of acid treated fruit shell of Aegle marmelos (L.) Correa (TAMC), for the adsorption of Zn(II) from aqueous solutions. TAMC was characterized using Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) analyses for the presence of functional groups, surface morphological changes in the chosen material and occurrence of absorption peak in the metal laden TAMC, respectively. Batch equilibration mode of experiments were carried out to assess the impact of the variable parameters viz., particle sizes and doses of the adsorbent material, predetermined time intervals between the sorbent and the sorbate species and pH of the medium. The optimized conditions for the maximum removal of Zn2+ ions (91.1%) from1000 mg L−1 initial concentration were 0.18 mm particle size, 1000 mg adsorbent dose, 10 min agitation time and pH 5.5. The applicability of Langmuir and Freundlich isotherms at various initial concentrations were plotted for Zn(II)-TAMC system wherein the best straight line was well suited for Langmuir model which indicated the monolayer adsorption. The maximum sorption capacity of TAMC was 80.45 mg g−1 as calculated from the equilibrium concentration data, which was observed to be substantially greater than the q (adsorption capacity at equilibrium) values reported employing different sorbent materials. The results revealed the fruit shell of Aegle marmelos (L.) Correa as a promising material with excellent metal removal capacity when compared to other sorbent materials.
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    SORPTION CAPACITY OF BIVALVE MOLLUSCS SHELL IN THE REMOVAL OF DIVALENT ION FROM AQUEOUS SOLUTIONS
    (International Journal of ChemTech Research, 2018) Charulatha S; Muthulakshmi Andal N
    Environmental protection emphasizes the use of ecofriendly materials instead of chemicals to minimize pollution. The present work deals with the utilization of acid treated Mussel shell powder, an molluscs shell waste for the adsorption of Pb(II) from aqueous solutions. TMSP is characterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX), Brunauer-Emmet-Teller (BET) and Barrett-Joyner-Halenda (BJH) analyses to study the surface morphology, elemental constitution, determination of surface area and pore structures. Batch equilibration studies are verified for the operating factors viz., particle sizes/ doses of the sorbent material upon a range of initial aqueous concentrations of Pb(II) at different temperatures, agitation time and pH of the Pb(II) -TMSP system to assess the sorption capacity which is recorded as 83.6 mg/g implying its efficiency to be three fold times more than the reported values for varied sorbents by other researchers. The applicability of Langmuir and Freundlich isotherms at various initial concentrations are plotted for Pb(II) -TMSP system wherein the best straight line is well fit for Langmuir model indicating monolayer adsorption. Continuous column running for quantitative estimation of Pb(II) removal from the bulk of the solution is carried out by the chosen sorbent.
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    EFFICACY OF AGRICULTURAL WASTES IN THE REMOVAL OF HEXAVALENT CHROMIUM- A REVIEW
    (Research and Reviews: Journal of Chemistry, 2014) Muthulakshmi Andal N; Charulatha S
    Hexavalent Chromium is a major pollutant released during several industrial operations. It is also reported as one of the metals known to be carcinogenic and has an adverse potential to modify the DNA transcription process. The removal of hexavalent chromium has been studied by various authors employing adsorbents developed from waste agro by-products to assess their adsorption characteristics. This paper focuses on the comparison of some agro based products in the removal of Cr(VI) ions. An extensive list of agricultural based products such as Coconut Coir, Prunus amygdalus, Cissusquadrangularis, Soapnut Acacia, Justicia adhatoda, Bhringraj, Aervalanata, Trianthemaportulacastrum, Tephrosiapurpurea, Solanum nigrum, Datura metel, Cleome viscose, Asparagus racemosus for the removal of Cr(VI) from aqueous solutions and the discharged effluents from industries are reviewed in this work. As chemically modified adsorbents exhibit higher adsorption capacity, a number of chemicals have been utilized for the required modifications of the adsorbent materials in the research articles. The results declared by the authors have been compared and summarized for further probe into the extensive utilization of the employed materials.
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    COLUMN OPERATIONS OF ZN(II)–MUSSEL SHELL POWDER SYSTEM EMPLOYING FIBRE REINFORCE POLYMER
    (PSG Institute of Advanced Studies, Peelamedu, Coimbatore, 2019-01) Muthulakshmi Andal N; Charulatha S
    Environmental protection emphasizes the use of ecofriendly materials instead of chemicals to minimize pollution. The present work deals with the utilization of acid treated Mussel shell powder(TMSP), an mollusc shell waste for the adsorption of Zn(II) from aqueous solutions. TMSP ischaracterized using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX), Brunauer-Emmet-Teller (BET) and Barrett-Joyner-Halenda (BJH) analyses to study the presenceof carboxylic, amino/ phenolic/ hydroxyl groups, surface morphology, elemental constitution,determination of surface area and pore structures. Batch equilibration studies are verified for theoperating factors viz., particle sizes/ doses of the sorbent material upon a range of initial aqueousconcentrations of Zn(II) at different temperatures, agitation time and pH of Zn(II) -TMSP system toassess TMSP sorption capacity. The maximum sorption capacity of TMSP is found to be 22.63 mg/gimplying its efficiency to be three fold times more than the reported Ce values for varied sorbentsby other researchers. Continuous column running for Zn(II) removal by TMSP from the bulk ofthe aqueous Zn(II) solution is estimated. The implications of the laboratory results are tested withelectroplating wastewaters collected from the industrial belt in Coimbatore district. Fibre ReinforcedPolymer is fabricated, packed with TMSP with specifications in column packing/flow rate of effluentsand installed at the effluent discharge plants where its performance indicated 100% Zn(II) removal.
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    TREATED MUSSEL SHELL POWDER(BIVALVE MOLLUSCS) AS A NOVEL ECO-FRIENDLY BIOSORBENT: A COMPARATIVE STUDY ON OPTIMIZATION OF DIVALENTIONS
    (Anna Adarsh College for women, Chennai, 2015) Muthulakshmi Andal N; Charulatha S
    The present study deals with the removal of Zn(II) and Cu(II) ions, both being prioritized pollutants of industrial effluents discharged from mining, metallurgical, electrical and electroplating into aqueous streams. Mussel Shell Powder (MSP), a novel sorbent is chosen for the removal of the selected divalent ions from aqueous solutions employing batch equilibration method. The excess alkaline nature of the collected MSP is reduced through neutralization by soaking it in 0. IN HCl for 4 hours. TMSP is characterized by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX).Batch equilibration method experiments pertaining to the study of variable parameters viz., particle sizes and doses of the adsorbent material, agitation time between the sorbent and the sorbate species, temperature and pH factors of the medium conducted for systems indicate that the sorption capacity is dependent on the operating variables The results revealed that the maximum percentage removal is 98.1 % for Zn(II) and 86. 3% for Cu(II) indicative of the best sorption efficiency of the animal waste.
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    SORPTION ABILITY OF MODIFIED FRUIT NUT SHELLS IN THE REMOVAL OF CO(II) IONS FROM AQUEOUS SOLUTIONS
    (Universal Journal of Environmental Research and Technology (Euresian Publications), 2013) Muthulakshmi Andal N; Charulatha S
    The present work deals with the efficiency of modified Terminalia catappa seed shell (TCSS), an agricultural waste, for the removal of Co(II) from aqueous solutions. Three methods of modifications of the sorbent material have been done and the experiments were carried out by employing batch equilibration method. The influences of variable parameters viz., particle sizes and adsorbent dosages of the sorbent material, agitation time, initial concentrations of the sorbate solutions, pH, cations, anions, co-ions and temperatures have been studied. The surface characteristic study of the modified TCSS has been supported by FT-IR, SEM and EDAX techniques. The linearity of the isothermal plots suggests that the Co(II) – TCCS system obeys Langmuir and Freundlich adsorption models.
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    EFFICACY OF AGRICULTURAL WASTES IN THE REMOVAL OF HEXAVALENT CHROMIUM- A REVIEW
    (Research and Reviews: Journal of Chemistry, 2013-12) Muthulakshmi Andal N; Charulatha S
    Hexavalent Chromium is a major pollutant released during several industrial operations. It is also reported as one of the metals known to be carcinogenic and has an adverse potential to modify the DNA transcription process. The removal of hexavalent chromium has been studied by various authors employing adsorbents developed from waste agro by-products to assess their adsorption characteristics. This paper focuses on the comparison of some agro based products in the removal of Cr(VI) ions. An extensive list of agricultural based products such as Coconut Coir, Prunus amygdalus, Cissus quadrangularis, Soapnut Acacia, Justicia adhatoda, Bhringraj, Aerva lanata, Trianthema portulacastrum, Tephrosia purpurea, Solanum nigrum, Datura metel, Cleome viscose, Asparagus racemosus for the removal of Cr(VI) from aqueous solutions and the discharged effluents from industries are reviewed in this work. As chemically modified adsorbents exhibit higher adsorption capacity, a number of chemicals have been utilized for the required modifications of the adsorbent materials in the research articles. The results declared by the authors have been compared and summarized for further probe into the extensive utilization of the employed materials.
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    SORPTION CHARACTERISTICS OF MODIFIED FRUIT SHELL ONTO ZN(II) IONS IN AQUEOUS MEDIA
    (Advances in Applied Research, 2018) Charulatha S; Muthulakshmi Andal N
    The present work was carried out to study the efficiency of acid treated fruit shell of Aeglemarmelos (L.) Correa (TAMC), for theadsorption of Zn(II) from aqueous solutions. TAMC was characterized using Fourier Transform Infrared (FTIR), ScanningElectron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) analyses for the presence of functional groups, surfacemorphological changes in the chosen material and occurrence of absorption peak in the metal laden TAMC, respectively. Batchequilibration mode of experiments were carried out to assess the impact of the variable parameters viz., particle sizes and doses ofthe adsorbent material, predetermined time intervals between the sorbent and the sorbate species and pH of the medium. Theoptimized conditions for the maximum removal of Zn2+ ions (91.1%) from1000 mg L-1 initial concentration were 0.18 mm particlesize, 1000 mg adsorbent dose, 10 min agitation time and pH 5.5. The applicability of Langmuir and Freundlich isotherms at variousinitial concentrations were plotted for Zn(II)-TAMC system wherein the best straight line was well suited for Langmuir modelwhich indicated the monolayer adsorption. The maximum sorption capacity of TAMC was 80.45 mg g-1 as calculated from theequilibrium concentration data, which was observed to be substantially greater than the q (adsorption capacity at equilibrium) evalues reported employing different sorbent materials. The results revealed the fruit shell of Aeglemarmelos (L.) Correa as apromising material with excellent metal removal capacity when compared to other sorbent materials (Keywords: Zinc ions, fruitshell, characterization, adsorption, parameters).