Comment on “Separation of vitamin E from palm fatty acid distillate using silica: I. Equilibrium of batch adsorption by B.S. Chu et al. [Journal of Food Engineering 62 (2004) 97–103]”

Choong, Thomas Shean Yaw; Chuah, Teong-Guan

doi:10.1016/j.jfoodeng.2004.05.001

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Fig. 5 shows that the plots obtained at two agitation speeds (i.e., 60 and 150 rpm) are almost overlapped (even within the first few hours), indicating that film diffusion should not be the rate controlling step for uptake kinetics [36,37]. In addition, Pd(II) sorption onto HABA/PEI is slower than ABA/PEI beads.…”

Section: Uptake Kineticsmentioning

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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Section: Uptake Kineticsmentioning

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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“…In a solid-liquid sorption process, adsorbate transfer can be controlled by resistances to film diffusion (so called external diffusion), surface diffusion, and pore diffusion, or combined surface and pore diffusion. A higher agitation speed is supposed to decrease the boundary layer (resistance to film diffusion) and thus increase the speed at which the sorption system reaches equilibrium [46,47]. In this study, the kinetic behaviors obtained from 60 rpm and 150 rpm are almost overlapped, even during the first few hours, suggesting that the external film diffusion should not be the main controlling factor.…”

Section: Uptake Kineticsmentioning

confidence: 67%

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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“…Although the response surface for the interaction between agitation and pH (Figure 4) shows a non-significant influence to increase the efficiency of glyphosate removal, it is observed that all values studied for the variables were favorable to the process, and it was not possible to identify optimal range for each one, evidencing a greater influence for the variation of the dosages of activated carbon studied on the efficiency of glyphosate adsorption. As agitation influences the speed at which the system reaches equilibrium, and not the stability itself, when the adsorption process reaches equilibrium (contact time between the adsorbent and the adsorbate), the adsorption values at different agitation speeds will be insignificant (Choong and Chuah, 2005).…”

Section: Resultsmentioning

confidence: 99%

Low-cost sorbent for removing glyphosate from aqueous solutions for non-potable reuse

Melo

Naval

2023

Rev. ambiente água

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This study aimed to determine the removal of glyphosate from aqueous solutions by adsorption with pulverized activated carbon, considering the possibility of including this method as an effluent treatment to be adopted for non-potable reuse. Pareto analysis techniques and response surface analysis were used to evaluate the efficiency and conditions of the process and its effects. The adsorbent used was Biocarbon PVU Tobasa, pulverized activated carbon, manufactured by Tobasa Bioindustrial de Babaçu S.A, from the endocarp of the babassu coconut (Attalea ssp) through a process of physical activation with water vapor. The adsorption tests were carried out keeping the initial concentration of the pesticide at 79.5 mg/L. The results show the effects of the correlated variables, obtaining the optimization of the experimental data, reaching the removal efficiency of approximately 60% of the glyphosate, for an adsorbent dosage of 3.2 g, pH 4.6 and speed of agitation 170 rpm. It is verified that activated carbon can be used as an adsorbent in the removal of glyphosate, even at high concentrations, proving to be an alternative treatment for wastewater, capable of obtaining water for non-potable reuse, regarding the presence of glyphosate. Keywords: activated carbono, adsorption of glyphosate, wastewater reuse.

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Comment on “Separation of vitamin E from palm fatty acid distillate using silica: I. Equilibrium of batch adsorption by B.S. Chu et al. [Journal of Food Engineering 62 (2004) 97–103]”

Cited by 5 publications

References 2 publications

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

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

Low-cost sorbent for removing glyphosate from aqueous solutions for non-potable reuse

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