Growth and spectroscopic, thermodynamic and nonlinear optical studies of L-threonine phthalate crystal

Theras, J. Elberin Mary; Kalaivani, D.; Jayaraman, D.; Joseph, V.

doi:10.1016/j.jcrysgro.2015.06.009

Cited by 20 publications

(13 citation statements)

References 18 publications

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“…The broad absorption peaks observed between 3000 and 3500 cm −1 and around 2928 cm −1 represent –OH and C–H stretching vibration, respectively. The peaks at 1650–1580, 1429, 1025 and 810 cm −1 correspond to COO– asymmetric stretching [ 11 ], COO– symmetric stretching [ 12 ], C–O–C anti-symmetric stretching [ 13 ] and CH 3 rocking vibration [ 14 ], respectively. It is noteworthy that although the alga contains a certain amount of fucoxanthin and protein, the peaks corresponding to sulfonate (on fucoxanthin) and amine groups (on protein) vibration are not detected on AB foams, which can be explained by the weakness of their signals.…”

Section: Resultsmentioning

confidence: 99%

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Vincent¹,

Faur

Guibal³

2017

Marine Drugs

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The incorporation of brown algae into biopolymer beads or foams for metal sorption has been previously reported. However, the direct use of these biomasses for preparing foams is a new approach. In this study, two kinds of porous foams were prepared by ionotropic gelation using algal biomass (AB, Laminaria digitata) or alginate (as the reference) and applied for Pb(II) sorption. These foams (manufactured as macroporous discs) were packed in filtration holders (simulating fixed-bed column) and the system was operated in either a recirculation or a one-pass mode. Sorption isotherms, uptake kinetics and sorbent reuse were studied in the recirculation mode (analogous to batch system). In the one-pass mode (continuous fixed-bed system), the influence of parameters such as flow rate, feed metal concentration and bed height were investigated on both sorption and desorption. In addition, the effect of Cu(II) on Pb(II) recovery from binary solutions was also studied in terms of both sorption and desorption. Sorption isotherms are well fitted by the Langmuir equation while the pseudo-second order rate equation described well both sorption and desorption kinetic profiles. The study of material regeneration confirms that the reuse of the foams was feasible with a small mass loss, even after 9 cycles. In the one-pass mode, for alginate foams, a slower flow rate led to a smaller saturation volume, while the effect of flow rate was less marked for AB foams. Competitive study suggests that the foams have a preference for Pb(II) over Cu(II) but cannot selectively remove Pb(II) from the binary solution.

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Section: Resultsmentioning

confidence: 99%

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Vincent¹,

Faur

Guibal³

2017

Marine Drugs

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“…The peak at 1591 cm −1 corresponds to C]N vibration, which is due to the reaction between primary amine groups of PEI and GA, forming "Schiff's base" [25]. The peak observed around 1429 cm −1 represents COOe symmetric stretching [26,27]. In a word, the main active functional groups on the beads that could be responsible for metal binding are carboxyl groups from alginate and amine groups from PEI-GA.…”

Section: Ftir Spectroscopy Analysismentioning

confidence: 99%

A new method for incorporating polyethyleneimine (PEI) in algal beads: High stability as sorbent for palladium recovery and supported catalyst for nitrophenol hydrogenation

Wang

Vincent

Faur

et al. 2019

Materials Chemistry and Physics

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“…The peaks at 1605, 1416, 1250, and 1022 cm −1 represent COOasymmetric stretching [28], COO-symmetric stretching [29,30], CH3 symmetric bending [31], and C-O-C anti-symmetric stretching [32,33], respectively. For C. crispus biomass, the main bands relate to -OH overlapping (3283 cm −1 ) [26], C-H stretching (2924 cm −1 ) [27], C=C stretching (1644 cm −1 ) [34], N-H bending and C-N stretching (1531 cm −1 ) [35], COO− symmetric stretching (1416 cm −1 ) [29,30], S-O stretching (1152 and 1221 cm −1 ) [36,37], C−O−C antisym. stretching (1152 and 1034 cm −1 ) [32,33], and CH bending (696 cm −1 ) [38].…”

Section: Characterizationmentioning

confidence: 99%

A Comparison of Palladium Sorption Using Polyethylenimine Impregnated Alginate-Based and Carrageenan-Based Algal Beads

2018

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Two kinds of algal beads were prepared using a carrageenan-based alga (Chrondrus crispus) and an alginate-based alga (Laminara digitata) ionotropically gelled with K(I) and Ca(II), respectively: the process consists of biopolymer partial extraction followed by hydrogel formation. The beads were modified with branched polyethylenimine (bPEI) and glutaraldehyde (GA) using the impregnation method to improve their sorption capacity for Pd(II) in acid solution. SEM-EDX and FTIR techniques were used for characterizing the beads. The impacts of pH and presence of anions, cations, and Pt(IV) were studied in batch experiments. The beads were also applied for Pd(II) recovery from synthesized leaching liquors of a spent catalyst and a car catalytic converter via the sorption-desorption process. Results show that Pd is concentrated in the outer layer of L. digitata-bPEI-GA composite (LD/PEI) beads, while in the case of the C. crispus-bPEI-GA composite (CC/PEI), it is homogenously distributed in the whole mass of the sorbents. The difference is attributed to the repulsive force of the outer Ca(II)-alginate barrier of LD/PEI beads that makes it difficult for the branched polymer PEI to penetrate through the layer and be immobilized in the inner compartment. As a result, LD/PEI beads possess a lower maximum sorption capacity, but a slightly faster uptake at pH 1 than CC/PEI beads. In addition, CC/PEI beads present a better recovery performance compared to LD/PEI beads when applied for the treatment of synthesized leaching liquors.

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Growth and spectroscopic, thermodynamic and nonlinear optical studies of L-threonine phthalate crystal

Cited by 20 publications

References 18 publications

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

Algal Foams Applied in Fixed-Bed Process for Lead(II) Removal Using Recirculation or One-Pass Modes

A new method for incorporating polyethyleneimine (PEI) in algal beads: High stability as sorbent for palladium recovery and supported catalyst for nitrophenol hydrogenation

A Comparison of Palladium Sorption Using Polyethylenimine Impregnated Alginate-Based and Carrageenan-Based Algal Beads

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