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  • 1
    Electronic Resource
    Electronic Resource
    An Investigation of Structural Stability and Internal Rotation in 3-Cyclopropenecarboxaldehyde and 3-Cyclopropenecarboxylic Acid Fluoride by ab initio Calculations (1998)
    Springer
    Journal of molecular modeling 4 (1998), S. 158-164 
    Details
    ISSN: 0948-5023
    Keywords: Ab initio ; Structural stability ; Rotational barrier ; 3-Cyclopropenecarboxaldehyde ; 3-Cyclo-propenecarboxylic acid fluoride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structural stability and internal rotation in 3-cyclopropenecarboxaldehyde and 3-cyclo-propenecarboxylic acid fluoride were investigated by ab initio calculations with a 6-31G* atomic basis in the latter and a 6-311G* atomic basis set in the former case. For the sake of comparison also results obtained with a 3-21G basis are given in the paper. As expected, it turned out that this basis set is not large enough for three-membered rings. The calculations were carried out both at the Restricted Hartree-Fock (HF) and the second order Moller-Plesset (MP2) levels. The trans-form is predicted to be the lower energy conformer for both molecules. However, in case of the fluoride the two conformers have nearly the same energy. Full optimization was performed at the transition states and the asymmetric potential function for the CXO internal rotations was predicted for both molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0089480040158
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  • 2
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    Lab scale studies on water hyacinth (Eichhornia crassipes Marts Solms) for biotreatment of textile wastewater (2021)
    In:  http://aquaticcommons.org/id/eprint/21677 | 17408 | 2017-11-27 10:11:55 | 21677 | University of Guilan, Faculty of Natural Resources, Iran
    Details
    Publication Date: 2021-06-27
    Description: Textile wastewater contains substantial pollution loads in terms of Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and heavy metals. Phytoremediation used for removing heavy metals and other pollutants by aquatic macrophytes treatment systems (AMATS) is well established environmental protective technique. A lab scale study was conducted to test the feasibility of water hyacinth for treating textile wastewater. The pH was reduced from alkaline to nearly neutral in all cases studied with the introduction of water hyacinth. The maximum reduction in the conductivity was 55.71% while the BOD and COD reduction ranged from 40 to 70%. A great deal of reduction in the total solids was noted in all the waste samples with a maximum reduction of 50.64%. Water hyacinth has tremendous potential to absorb heavy metals from the textile wastewater as it resulted in 94.78% reduction of chromium, 96.88% in zinc and 94.44 % reduction in copper. ANOVA showed a significant (p〈0.05) reduction in all the pollutants with the passage of time. Thus water hyacinth can be an efficient biological agent in reducing the pollution loads in textile industry wastewater.
    Keywords: Chemistry ; Environment ; Pollution ; Eichhornia crassipes
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 83-88
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  • 3
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    Lab Scale Studies on Water Hyacinth (Eichhornia crassipes Marts Solms) for Biotreatment of Textile Wastewater (2017)
    Details
    Publication Date: 2021-05-19
    Description: Textile wastewater contains substantial pollution loads in terms of Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and heavy metals. Phytoremediation used for removing heavy metals and other pollutants by aquatic macrophytes treatment systems (AMATS) is well established environmental protective technique. A lab scale study was conducted to test the feasibility of water hyacinth for treating textile wastewater. The pH was reduced from alkaline to nearly neutral in all cases studied with the introduction of water hyacinth. The maximum reduction in the conductivity was 55.71% while the BOD and COD reduction ranged from 40 to 70%. A great deal of reduction in the total solids was noted in all the waste samples with a maximum reduction of 50.64%. Water hyacinth has tremendous potential to absorb heavy metals from the textile wastewater as it resulted in 94.78% reduction of chromium, 96.88 % in zinc and 94.44 % reduction in copper. ANOVA showed a significant (p〈0.05) reduction in all the pollutants with the passage of time. Thus water hyacinth can be an efficient biological agent in reducing the pollution loads in textile industry wastewater.
    Description: Published
    Keywords: AMATS ; Biological wastewater treatment ; Biotreatment ; Water hyacinth ; Textile wastewater ; Water hyacinth ; Water ; Biotreatment ; Wastewater ; Eichhornia crassipes
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.83-88
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