Defect and microstructural evolution during drying of soapnut-based alumina foams

Pradhan, Mamata; Bhargava, Parag

doi:10.1016/j.jeurceramsoc.2008.05.025

Cited by 21 publications

(14 citation statements)

References 59 publications

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“…6a, displayed the differences in average absorbance spectra for the soapnut and soapnut-phosphate solutions, both with and without As(V), together with the absorption range of different molecular vibrations present in phenolic-OH at 3,435 cm -1 , carbonyl groups of carboxylic acid at 2,090 cm -1 and alkene groups at 1,640 cm -1 . These are similar to the observations made by Pradhan and Bhargava (2008) (Pradhan and Bhargava 2008). All the spectra resembled that of only soapnut and no shifting of peaks in FT-IR spectra was observed in the soapnut solution in presence of phosphate and As(V).…”

Section: Zeta Potential and Ft-ir Spectrasupporting

confidence: 89%

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Mukhopadhyay

Hashim

Allen

et al. 2013

Int. J. Environ. Sci. Technol.

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An environment friendly arsenic removal technique from contaminated soil with high iron content has been studied. A natural surfactant extracted from soapnut fruit, phosphate solution and their mixture was used separately as extractants. The mixture was most effective in desorbing arsenic, attaining above 70 % efficiency in the pH range of 4-5. Desorption kinetics followed Elovich model. Micellar solubilization by soapnut and arsenic exchange mechanism by phosphate are the probable mechanisms behind arsenic desorption. Sequential extraction reveals that the mixed soapnut-phosphate system is effective in desorbing arsenic associated with amphoteric-Fe-oxide forms. No chemical change to the wash solutions was observed by Fourier transform-infrared spectra. Soil:solution ratio, surfactant and phosphate concentrations were found to affect the arsenic desorption process. Addition of phosphate boosted the performance of soapnut solution considerably. Response surface methodology approach predicted up to 80 % desorption of arsenic from soil when treated with a mixture of &1.5 % soapnut, &100 mM phosphate at a soil:solution ratio of 1:30.

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Section: Zeta Potential and Ft-ir Spectrasupporting

confidence: 89%

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Mukhopadhyay

Hashim

Allen

et al. 2013

Int. J. Environ. Sci. Technol.

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“…FT-IR spectral data shown in Figure 2(a) displays the absorbance spectra for the influent and the effluent soapnut solutions. The absorption range of different molecular vibrations present in phenolic-OH at 3436 cm -1 , carbonyl groups of carboxylic acid at 2092 cm -1 and alkene groups at 1642 cm -1 are observed and are similar to earlier findings (Pradhan and Bhargava, 2008). No shifting of peaks in FT-IR spectra was observed in the effluent soapnut solution in presence of arsenic compared to influent soapnut solution.…”

Section: Zeta Potential and Ft-ir Spectral Datasupporting

confidence: 88%

Application of colloidal gas aphron suspensions produced from Sapindus mukorossi for arsenic removal from contaminated soil

et al. 2015

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Colloidal gas aphron dispersions (CGAs) can be described as a system of microbubbles suspended homogenously in a liquid matrix. This work examines the performance of CGAs in comparison to surfactant solutions for washing low levels of arsenic from an iron rich soil. Sodium Dodecyl Sulfate (SDS) and saponin, a biodegradable surfactant, obtained from Sapindus mukorossi or soapnut fruit were used for generating CGAs and solutions for soil washing. Column washing experiments were performed in down-flow and up flow modes at a soil pH of 5 and 6 using varying concentration of SDS and soapnut solutions as well as CGAs. Soapnut CGAs removed more than 70% arsenic while SDS CGAs removed up to 55% arsenic from the soil columns in the soil pH range of 5-6. CGAs and solutions showed comparable performances in all the cases. CGAs were more economical since it contains 35% of air by volume, thereby requiring less surfactant. Micellar solubilization and low pH of soapnut facilitated arsenic desorption from soil column. FT-IR analysis of effluent suggested that soapnut solution did not interact chemically with arsenic thereby facilitating the recovery of soapnut solution by precipitating the arsenic. Damage to soil was minimal arsenic confirmed by metal dissolution from soil surface and SEM micrograph.

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“…FT-IR spectral data as exhibited in Fig. 6, displayed the differences in average absorbance spectra for the influent and the effluent soapnut solutions, together with the absorption range of different molecular vibrations present in phenolic-OH at 3436 cm -1 , carbonyl groups of carboxylic acid at 2092 cm -1 and alkene groups at 1642 cm -1 , similar to earlier observations (Pradhan and Bhargava, 2008).…”

Section: Zeta Potential Ft-ir Spectral Data and Mechanism Of As Remosupporting

confidence: 86%

Comparison of a plant based natural surfactant with SDS for washing of As(V) from Fe rich soil

Mukhopadhyay

Hashim

Sahu

et al. 2013

Journal of Environmental Sciences

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This study explores the possible application of a biodegradable plant based surfactant, obtained from Sapindus mukorossi, for washing low levels of arsenic (As) from an iron (Fe) rich soil. Natural association of As(V) with Fe(III) makes the process difficult. Soapnut solution was compared to anionic surfactant sodium dodecyl sulfate (SDS) in down-flow and a newly introduced suction mode for soil column washing. It was observed that soapnut attained up to 86% efficiency with respect to SDS in removing As. Full factorial design of experiment revealed a very good fit of data. The suction mode generated up to 83 kPa pressure inside column whilst down-flow mode generated a much higher pressure of 214 kPa, thus making the suction mode more efficient. Micellar solubilisation was found to be responsible for As desorption from the soil and it followed 1st order kinetics. Desorption rate coefficient of suction mode was found to be in the range of 0.005 to 0.01, much higher than down-flow mode values. Analysis of the FT-IR data suggested that the soapnut solution did not interact chemically with As, offering an option for reusing the surfactant. Soapnut can be considered as a soil washing agent for removing As even from soil with high Fe content.

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Defect and microstructural evolution during drying of soapnut-based alumina foams

Cited by 21 publications

References 59 publications

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Arsenic removal from soil with high iron content using a natural surfactant and phosphate

Application of colloidal gas aphron suspensions produced from Sapindus mukorossi for arsenic removal from contaminated soil

Comparison of a plant based natural surfactant with SDS for washing of As(V) from Fe rich soil

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