Steric hindrance effect on adsorption of metal–organic complexes onto aminophosphonate chelating resin

Deepatana, Anat; Valix, Marjorie

doi:10.1016/j.desal.2007.02.025

Cited by 31 publications

(16 citation statements)

References 7 publications

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“…This could be attributed to the steric hindrance offered by the large polymer chains to the surfactant molecules. 59 Also, the adsorption of some polymer molecules on the adsorption sites (sand surface) reduces the effective sites available for adsorption of the surfactant. These results are consistent with the previous studies of adsorption of the surfactant in the presence of the polymer.…”

Section: Resultsmentioning

confidence: 99%

Anionic/Nonionic Surfactant Mixture for Enhanced Oil Recovery through the Investigation of Adsorption, Interfacial, Rheological, and Rock Wetting Characteristics

et al. 2021

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Surfactant adsorption is a major problem encountered with the surfactant polymer flooding. A lot of additives have been used in this regard to tackle this problem. In the present study, a mixture of a nonionic and an anionic surfactant was used to investigate its effect on the various aspects of the surfactant polymer flooding. The effect of temperature and the nonionic surfactant concentration on the critical micelle concentration of the anionic surfactant was explored. The adsorption behavior of the surfactant mixture on the sand particles was explored by comparing the initial and final concentrations of the surfactant mixture. The adsorption data were fitted in the different adsorption isotherms (Langmuir, Freundlich, and Temkin). The interfacial property and the rock wetting characteristics of the surfactant mixture were investigated by measuring the surface tension and contact angle, respectively. Next, the viscosity of the chemical slug (surfactant and polymer) was analyzed at different temperatures. The viscosity results were fitted in the power law model to understand the fluid flow behavior. Finally, the sand pack flooding experiments were performed using the chemical slug composed of a surfactant mixture and an industrial-grade polymer. In all the experiments, the binary surfactant mixture outperforms the individual surfactants and efficiently reduced the surfactant adsorption by 63%. Also, the binary surfactant mixture achieved an ultralow interfacial tension value of 0.0097 mN/m. The chemical slug composed of the binary surfactant and polymer was able to recover up to 76% of the total oil.

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Section: Resultsmentioning

confidence: 99%

Anionic/Nonionic Surfactant Mixture for Enhanced Oil Recovery through the Investigation of Adsorption, Interfacial, Rheological, and Rock Wetting Characteristics

et al. 2021

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“…As presented in Figure 1, all the resins were estimated to possess relatively wide pore size distributions and be rich in the macro and mesoporous region, which could enable adsorbate to reach the internal functional groups easily [28]. The basic parameters of the five resins are listed in Table 1.…”

Section: Characterization Of Different Functional Group Density Resinsmentioning

confidence: 99%

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

Sun

Zheng

et al. 2019

Applied Sciences

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Adsorption using anion exchange resins is an efficient method for the removal of aromatic sulfonic acids (ASAs) from industrial wastewater. In this study, a series of weak-base anion exchangers (SD1–SD5) were synthesized to investigate the effect of functional group density of resins on the adsorption of ASAs from wastewater containing competitive inorganic anions. p-Toluene sulfonic acid (PTSA) was selected as a target pollutant, and Na2SO4 was chosen as the competitive inorganic salt because of its widespread existence in industrial wastewater. Adsorption performances of these resins were evaluated and compared in terms of selectivity, kinetics, isotherms, regeneration, and dynamic adsorption behavior. Importantly, the PTSA uptake increased with the raising content of functional groups on resins in the absence of Na2SO4; however, in the presence of a high level of Na2SO4 (for example, ≥1%), a decrease in the functional group density could improve the adsorption capacity of resins for PTSA. Moreover, desorption and fixed bed column experiments were conducted in all resins, thereby confirming the effect of functional group density of resins on the PTSA adsorption in actual application. In brief, this research will provide a better understanding for the design and preparation of anion exchangers for the effective removal of ASA from wastewater.

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“…Such is not the case neither of NP nor of MA, as their aromatic rings are too close to the acid group. An important effect that can influence adsorption capacity is the steric hindrance [63], when a molecule of non-negligible size, upon adsorption, superposes some adjacent sites in the surface and excludes them from binding so that not all binding sites can effectively attach molecules. In our case the GB, as referred above, due to its size and structure, interacts with two nearby Mg 2+ cations reducing the number of such binding sites of the surface.…”

Section: Models For Adsorption Isothermsmentioning

confidence: 99%

Mechanisms of removal of three widespread pharmaceuticals by two clay materials

Dordio

Miranda

Ramalho

et al. 2017

Journal of Hazardous Materials

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Steric hindrance effect on adsorption of metal–organic complexes onto aminophosphonate chelating resin

Cited by 31 publications

References 7 publications

Anionic/Nonionic Surfactant Mixture for Enhanced Oil Recovery through the Investigation of Adsorption, Interfacial, Rheological, and Rock Wetting Characteristics

Anionic/Nonionic Surfactant Mixture for Enhanced Oil Recovery through the Investigation of Adsorption, Interfacial, Rheological, and Rock Wetting Characteristics

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

Mechanisms of removal of three widespread pharmaceuticals by two clay materials

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