Diverse Secondary Interactions between Ions Exchanged into the Resin Phase and Their Analytical Applications

Yuchi, Akio

doi:10.2116/analsci.30.51

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Kinetic and equilibrium adsorption measurements have essential role to get information for the design and operation of phosphate removal process in water/wastewater treatment (Yuchi, 2014).…”

Section: Kinetic Analysismentioning

confidence: 99%

Phosphate recovery from sewage sludge supernatants using magnetic nanoparticles

Gulyás

Genç

Can

et al. 2021

Journal of Water Process Engineering

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PHOSPHATE RECOVERY FROM SEWAGE SLUDGE SUPERNATANTUSING MAGNETIC NANOPARTICLESPhosphorus is one of the most essential nutrients; it is used in the manufacture of fertilizers, detergents, and polishers. Environmental pollution due excessive nutrient discharges is the most important issue in wastewater treatment. Nutrients have many adverse effects on surface water resources, groundwater and soil. Despite the extensive uses of phosphorus in different sectors, phosphorus is a non-renewable and noninterchangeable limited resource. Consequently, the recovery of phosphate should be considered as well as the removal.This study was carried out to investigate the efficiency of employing magnetic nanoparticles (MNPs) in phosphorus removal from sewage sludge supernatant. In the scope of the study, batch experiments were performed to investigate the effect of different parameters on phosphate adsorption using iron oxide magnetic nanoparticles.The iron oxide MNP was prepared with co-precipitation method. MNP characterization was done with X-ray diffraction, Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy measurements. These experiments proved the effective phosphate adsorption by iron oxide MNP. The presence adsorbed of the phosphorus on the surface of magnetic nanoparticles was confirmed using energy-dispersive x-ray spectroscopy. Zeta potential measurements were conducted to determine the surface charge of the particles at different pH values. Equilibrium studies showed that the synthetic P solution and supernatant solution was consistent with the Redlich-Peterson isotherm model. The theoretical maximum adsorption capacity of iron oxide MNP calculated using Sips model is 20.8 mg/g. The kinetics studies of the synthetic phosphate solution and supernatant solution was consistent with the Elovich model. The highest adsorption capacity was measured with 1000 mg/L P solution and 0.3 g magnetic nanoparticles. Desorption of phosphorus from the iron oxide MNP surface was effectively done by treating the MNPs with 1 M NaOH solution vi for 1 hour.The aim of this study to evaluate the MNP for the adsorption of phosphate. We would like to find a more accurate usage for nanoparticles, moreover to examine a cheaper, more available method for phosphate recovery.

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Section: Kinetic Analysismentioning

confidence: 99%

Phosphate recovery from sewage sludge supernatants using magnetic nanoparticles

Gulyás

Genç

Can

et al. 2021

Journal of Water Process Engineering

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“…The fundamental features of the conventional IXRs based on polystyrene-divinylbenzene (PS-DVB) copolymer once settled have been spotlighted by modern instrumental analyses and by in-depth studies, as summarized in a recent review. 1 One of the topics is the size of quantitatively exchangeable ions. It has been recognized that the saturated exchange capacity of tetraalkylammonium (TAA + ) ion on a cation exchange resin (CXR, -R -,M + ) decreases with an increase in size of the alkyl (R) group of TAA + (R, abbreviation, volume: methyl, TMA + , 140 Å 3 ; ethyl, TEA + , 250 Å 3 ; propyl, TPA + , 360 Å 3 ) and with an increase in cross-linking (CL) degree (CL degree, saturated % exchange for TMA + and TEA + : 2, 100, 100; 5, 90, 87; 10, 69, 63; 15, 63, 48).…”

Section: Introductionmentioning

confidence: 99%

Volume of Space within Cation-exchange Resins Determined by Penetration of Inorganic Salt Solutions

et al. 2018

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Penetration of salt solutions into cation exchange resins was used to measure the volume of a space within the resin phase (the inner space), which was usable for ion exchange in principle but not fully in practice. The average volume of the inner space per functional group was significantly dependent on the type and the concentration of the salt (250-450 Å 3) for a resin having the cross-linking degree of 8%, while being less dependent on the type and the concentration of the salt (160-240 Å 3) for a resin having the cross-linking degree of 12%. The salt concentration ratio of the solution filling the inner space to the outer solution decreased with a decrease in concentration of the outer salt solution due to the osmotic pressure, and decreased with an increase in cross-linking degree due to the smaller volume and the higher independency of the inner space.

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“…However, the further elimination of non-ionic interactions between anions and the substrate can be achieved by moving anion exchange groups aside from the hydrophobic polymer surface by using long linkers [15,16]. These effects can also be explained from the view point of hydration of the functional site, as soon as more polarizable anions have higher affinity to more hydrophobic less hydrated anion exchange groups, which leads to their higher retention and sometimes considerable peak asymmetry [17,18]. In this case, moving functional groups aside from the hydrophobic polymer surface leads to their better hydration.…”

Section: Introductionmentioning

confidence: 99%