Adsorption behaviour of direct yellow 50 onto cotton fiber: Equilibrium, kinetic and thermodynamic profile

Ismail, L.F.M.; Sallam, H. B.; Farha, S.A. Abo; Gamal, Ahmed; Gorji, Mahmoud

doi:10.1016/j.saa.2014.03.060

Cited by 23 publications

(13 citation statements)

References 32 publications

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“…It was reported that the first stage was corresponded to macropores or mesopores diffusion and the second stage was ascribed to micropores diffusion for the porous materials. The parameter α represents thickness of boundary layer, and the larger the parameter α is, the thicker the boundary layer and greater contribution of surface adsorption in the rate‐controlling step . For EGCG and CAF adsorbed by PSt, the values of α for the first stage were negative, indicating macropores did not exist in the resin, and the first stage was ascribed to mesopores diffusion.…”

Section: Resultsmentioning

confidence: 99%

Preparation of organic-inorganic hybrid porous materials and adsorption characteristics for (-)-epigallocatechin gallate and caffeine from the extract of discarded tea

Liu

et al. 2015

Polym Eng Sci

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A series of novel organic-inorganic hybrid porous materials were synthesized using the method of suspension polymerization. As content of oleic acid-coated TiO 2 introduced increased, the surface area, pore volume, and average pore diameter increased, and meantime macropores appeared. The adsorption efficiencies of the porous materials for (2)-epigallocatechin gallate (EGCG) and caffeine (CAF) were enhanced, due to synergistic effect of surface area, pore volume, average pore diameter, and several driving forces such as charge induced force, p-p stacking, and hydrogen bond. Adsorption kinetic analysis indicated that pseudo-second-order kinetics can reasonably depict the adsorption process, and intraparticle diffusion became more obvious after a contact time of 30 min. Adsorption isotherm analysis indicated Freundlich isotherm could be used to describe the adsorption process. Charge induced force, p-p stacking, hydrogen bond, and sieving effect of pores were the main driving forces for the adsorption of EGCG and CAF by the organic-inorganic hybrid porous materials. This study will open possibility of expanding number and types of porous materials and provide assistance in tailoring corresponding physical-chemical properties, according to specific analytes. POLYM. ENG. SCI., 55:2414-2422, 2015

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Section: Resultsmentioning

confidence: 99%

Preparation of organic-inorganic hybrid porous materials and adsorption characteristics for (-)-epigallocatechin gallate and caffeine from the extract of discarded tea

Liu

et al. 2015

Polym Eng Sci

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“…The parameter C denotes thickness of boundary layer. The larger the C is, the thicker the boundary layer and greater contribution of surface adsorption in the rate-controlling step [33]. It can be seen that for all the adsorption systems, the values of C from the second stage and third stage were larger than those from the first stage, indicating boundary layer effect significantly affected the adsorption of oleuropein from large pores to small pores, and capillary effect may take place at the two intersections.…”

Section: Adsorption Kinetics Analysismentioning

confidence: 93%

Adsorption behaviors for oleuropein from olive leaves extracts by porous materials with carbon nanotubes

Liu

Zhang

et al. 2015

Colloid Polym Sci

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Porous materials with carboxyl-modified multiwalled carbon nanotube (C-CNT) were prepared and applied to enrich oleuropein. Surface area, pore volume, and average pore diameter increased with increasing C-CNT content, and adsorption capacity was greatly enhanced. The results indicated that pseudo-second-order kinetics could describe the whole adsorption process, while intraparticle diffusion model fit the experimental data for the second stage (10-300 min). It suggested Freundlich isotherm model could describe the adsorption process. It showed that the porous materials exhibited excellent reusability and during six adsorption-desorption cycles, adsorption capacities showed no obvious loss. The high adsorption capacities, easy desorption, and remarkable reusability made the prepared porous materials as novel adsorbents for the enrichment of oleuropein. This study indicates porous materials with carboxyl group, large surface area, pore volume, and average pore diameter are favorable for oleuropein enrichment, providing an idea to design porous materials with carboxyl groups for oleuropein enrichment.

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“…It can be noted that the removal percent increased with the increase in the adsorbent dose while the adsorption capacity was decreased. The increase of the removal percent due to increase the surface area of adsorbent whatever, increase the number of active sites which are available for adsorption leading to the increase in the removal percent [23]. However, the adsorption capacity decreased as the adsorbent dosage increased due to at a higher adsorbent dosage the available active sites on the adsorbent increased compared with the lower adsorbent dosage.…”

Section: Adsorption Studymentioning

confidence: 99%

Removal of phosphate ions from wastewater by treated hydrogel based on chitosan

et al. 2019

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C HITOSAN/ Gelatin/2-(Dimethylamino) ethyl methacrylate (Cs/Gltn/PDMAEMA) hydrogel was synthesized by gamma irradiation for the expulsion of phosphate ions from wastewater. Chemical adjustment of the hydrogel with thiourea was performed to introduce thiol groups Cs/Gltn/PDMAEMA-treated. Moreover trapping of SiO 2 into the hydrogel matrix to acquire Cs/Gltn/PDMAEMA/SiO 2 composite. It was found that the gelation increases with increasing PDMAEMA content in the hydrogel. The maximum gelation performed at an equal ratio of Cs/Gltn at a radiation dose of 15 kGy. The adsorption capacities of the prepared systems towards phosphate ions were investigated. It was obtained that the maximum removal is achieved at pH 6 through 180 min. However, the removal percent decreases with increasing phosphate ions concentration and temperature. The ability of the prepared adsorbents towards phosphate ions removal are ascending ordered in the sequence of Cs/Gltn/PDMAEMA hydrogel, Cs/Gltn/PDMAEMA-treated , and Cs/Gltn/PDMAEMA/SiO 2 composite. The pseudo secondorder equation fits well the adsorption kinetics. The adsorption isotherm follows the Freundlich model higher than the Langmuir model

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Adsorption behaviour of direct yellow 50 onto cotton fiber: Equilibrium, kinetic and thermodynamic profile

Cited by 23 publications

References 32 publications

Preparation of organic-inorganic hybrid porous materials and adsorption characteristics for (-)-epigallocatechin gallate and caffeine from the extract of discarded tea

Preparation of organic-inorganic hybrid porous materials and adsorption characteristics for (-)-epigallocatechin gallate and caffeine from the extract of discarded tea

Adsorption behaviors for oleuropein from olive leaves extracts by porous materials with carbon nanotubes

Removal of phosphate ions from wastewater by treated hydrogel based on chitosan

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