Adsorption of chromium (VI) from the synthetic aqueous solution using chemically modified dried water hyacinth roots

Kumar, Pankaj; Chauhan, M. S.

doi:10.1016/j.jece.2019.103218

Cited by 88 publications

(34 citation statements)

References 38 publications

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“…O–H or N–H stretching vibration was at 3390 cm −1 . The peaks around 2927 and 2884 cm −1 were assigned to methyl and methylene stretching vibrations 25 . The absorption peak of the vibration of the saturated ester groups compounds appeared around 1740 cm −1 26 and the peak at 1643 cm −1 which was ascribed to the C = O stretching vibrations of carboxylic anions, hemicelluloses or amide groups in proteins 27 .…”

Section: Resultsmentioning

confidence: 99%

Soil-applied selenite increases selenium and reduces cadmium in roots of Moringa oleifera

Liu

et al. 2020

Sci Rep

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Deficiency of selenium (Se) will lead to malnutrition and decreased immune function of the body. There is a common phenomenon of Se deficiency in foods. In this study, different concentrations of sodium selenite (Na2SeO3) were applied to Moringa oleifera grownin soil. The purpose was to explore the feasibility of Se biofortification of M. oleifera root. The effect of exogenous Se on the accumulation of Se and cadmium (Cd) in the roots of M. oleifera was studied by inductively coupled plasma mass spectrometry, and the mechanism of exogenous Se on the accumulation of Se and Cd in the roots was studied by Fourier transform infrared spectroscopy (FTIR) combined with principal component analysis and partial least squares regression analysis. The results showed that Na2SeO3 significantly affected the accumulation of Se and Cd in the roots (p < 0.05). The increase in Se was highest when Na2SeO3 was around 4.0 mg/kg, which increased by 315% compared with the control. The decrease in Cd was the lowest when Na2SeO3 was around 2.0 mg/kg, which decreased by 80% compared with the control. The results of FTIR analysis showed that Na2SeO3 treatment changed the carboxylate, phosphate radical, hemicellulose and protein in roots of M. oleifera, while the increase of Se was related to hemicellulose, protein, polysaccharide and lignin, and the decrease of Cd was related to hemicellulose and protein. The results showed that exogenous Se increased the accumulation of Se and inhibited the absorption of Cd. Therefore, the roots of M. oleifera can be used in Se biofortified products.

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Section: Resultsmentioning

confidence: 99%

Soil-applied selenite increases selenium and reduces cadmium in roots of Moringa oleifera

Liu

et al. 2020

Sci Rep

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“…They interfere in power generation, irrigation and avert the sunlight penetration leading to eutrophication. Moreover, they are made up of lignin, cellulose, hemicelluloses and prosperous in hydroxyl groups that assist in adsorption [1,11]. Therefore it will play the dual role of treating the pollutant as well as eradicating the toxic weed [12].…”

Section: Differentmentioning

confidence: 99%

“…Residual Cr (VI) concentration in the solution after adsorption was analyzed spectrophotometrically by Diphenyl carbazide method. Spectrophotometer follows the principle of Beer's law which reads the purple violet colour at 540 nm [1]. The percent removal of Cr (VI) ions was assessed by the following equation (1).…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…Chromium is a pernicious heavy metal that taints the water resources strenuously. Chromium (VI) is the toxic form which is 500 times malignant in comparison to Cr (III) [1]. Overexposure of Cr (VI) uptake leads to development of tumor cells in liver and stomach whereas Cr (III) in considerable amount is essential for certain metabolism [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Exploring the Potential of Biochar Activated with Phosphoric Acid towards Hexavalent Chromium Removal

Kalaiarasi

Parameswari

Davamani

2020

IRJPAC

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The biochar derived from the dreadful weed water hyacinth (Eichhornia crassipes) was activated with phosphoric acid was utilized for adsorption of hexavalent chromium (Cr (VI)) from the simulated solution. The characterization (Zeta potential, specific surface area, Scanning Electron Microscope analysis) of biochar was done to study the surface properties of the biochar. The modified biochar (379 m2g-1) recorded 49.80% greater surface area in comparison to the pristine biochar (253 m2g-1). Zeta potential of modified biochar is 4.2 mV and pristine biochar is -13.9 mV. Positively charged modified surface enhance the sorption of negatively charged Cr (VI) ions. Study on effect of pH and concentration revealed that maximum sorption occurred at pH 2 and the increasing trend of concentration resulted in the decreased sorption respectively. The isotherm study was well supported by Langmuir isotherm (R2 value=0.976) defining the monolayer adsorption. Maximum adsorption capacity was recorded for phosphoric acid modified biochar (50.0 mg g-1) than the pristine biochar (35.7 mg g-1). Pseudo second order kinetics (R2 value=0.998) sounds good in explaining the rate of reaction. The findings reflect the utility of acid modified Eichhornia crassipes for heavy metal removal from aqueous medium.

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“…The removal efficiency percent of Congo red increased from 88.39 to 95.03% as the agitation velocity increased from 100 to 300 rpm. The increase in removal efficiency with the increase of rate is due to the proper distribution of adsorbent throughout the bulk solution [36].…”

Section: Effect Of Agitated Speedmentioning

confidence: 99%

Elimination of Congo Red Dyes From Aqueous Solution Using Eichhornia Crassipes

Ali¹,

Mohammed²

2020

IJCPE

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Water hyacinth (Eichhornia crassipes) is a free-floating plant, growing plentifully in the tropical water bodies. It is being speculated that the large biomass can be used in wastewater treatment, heavy steel and dye remediation, as a substrate for bioethanol and biogas production, electrical energy generation, industrial uses, human food and antioxidants, medicines, feed, agriculture, and sustainable improvement. In this work, the adsorption of Congo Red (CR) from aqueous solution onto EC biomass was investigated through a series of batch experiments. The effects of operating parameters such as pH (3-9), dosage (0.1-0.9 g. /100 ml), agitated velocity (100-300), size particle (88-353μm), temperature (10-50˚C), initial dye concentration (50-500) mg/l, and sorption–desorption were investigated to assess the efficiency of EC-elimination from aqueous solution. Different pre-treatments, alkali, and acid were achieved to increase the adsorption uptake. The optimum conditions for maximum removal of CR from an aqueous solution of 50 mg/L were as follows: pH (6), particle size (88 μm), stirring speed (200 rpm), and dose (0.3 g). The experimental isotherms data were analyzed using Langmuir, Freundlich, and Temkin isotherm equations and the results indicated that the Langmuir isotherm showed a better fit for CR adsorption with a higher adsorption uptake of 92.263mg/g, and the kinetic data were fitted well with pseudo-second-order kinetic model. Thermodynamic parameters were calculated from Van’t Hoff plot, confirming that the adsorption process was spontaneous and endothermic. Data show that the adsorption-desorption process lasts for four cycles before losing its efficiency and the recovery efficiency increased up to 76.63%.

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Adsorption of chromium (VI) from the synthetic aqueous solution using chemically modified dried water hyacinth roots

Cited by 88 publications

References 38 publications

Soil-applied selenite increases selenium and reduces cadmium in roots of Moringa oleifera

Soil-applied selenite increases selenium and reduces cadmium in roots of Moringa oleifera

Exploring the Potential of Biochar Activated with Phosphoric Acid towards Hexavalent Chromium Removal

Elimination of Congo Red Dyes From Aqueous Solution Using Eichhornia Crassipes

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