scholarly journals Quaternization of Composite Algal/PEI Beads for Enhanced Uranium Sorption—Application to Ore Acidic Leachate

Gels ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 12 ◽  
Author(s):  
Mohammed F. Hamza ◽  
Amal E. Mubark ◽  
Yuezou Wei ◽  
Thierry Vincent ◽  
Eric Guibal
Keyword(s):  
Ph Effect ◽  
Sorption Isotherms ◽  
Environmental Safety ◽  
Sorption Properties ◽  
Yellow Cake ◽  
Maximum Sorption Capacity ◽  
Copper Precipitation ◽  
Protonated Amine ◽  
Maximum Sorption ◽  
Pre Treatment

The necessity to recover uranium from dilute solutions (for environmental/safety and resource management) is driving research towards developing new sorbents. This study focuses on the enhancement of U(VI) sorption properties of composite algal/Polyethylenimine beads through the quaternization of the support (by reaction with glycidyltrimethylammonium chloride). The sorbent is fully characterized by FTIR, XPS for confirming the contribution of protonated amine and quaternary ammonium groups on U(VI) binding (with possible contribution of hydroxyl and carboxyl groups, depending on the pH). The sorption properties are investigated in batch with reference to pH effect (optimum value: pH 4), uptake kinetics (equilibrium: 40 min) and sorption isotherms (maximum sorption capacity: 0.86 mmol U g−1). Metal desorption (with 0.5 M NaCl/0.5 M HCl) is highly efficient and the sorbent can be reused for five cycles with limited decrease in performance. The sorbent is successfully applied to the selective recovery of U(VI) from acidic leachate of uranium ore, after pre-treatment (cementation of copper, precipitation of rare earth elements with oxalate, and precipitation of iron). A pure yellow cake is obtained after precipitation of the eluate.

scholarly journals Phosphorus Sorption and Redistribution on Soil Solid Phase in a Brazilian Haplorthox Amended with Biosolids

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Ricardo de Oliveira Munhoz ◽  
Ronaldo Severiano Berton ◽  
Otávio Antonio de Camargo
Keyword(s):  
Binding Energy ◽  
Solid Phase ◽  
Sorption Isotherms ◽  
Land Application ◽  
Phosphorus Sorption ◽  
Sequential Fractionation ◽  
Soil P ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
P Fraction

Land application of biosolids (SS) can cause a buildup of phosphorus (P) in the top soil. The changes in the soil P characteristics may be assessed by the sorption isotherm and the sequential fractionation techniques. Samples of Haplorthox were collected from a field experiment where maize was cultivated for two years, after two applications of SS originated from two cities of São Paulo State, Brazil. SS applications added a total of 125, 250, 500, 1000 and 2000 kg ha−1of P in the area. To perform the sorption isotherms and obtain P maximum sorption capacity (Qmax) and the binding energy, soil samples were submitted to increasing P concentration solutions until equilibrium was reached. Sequential fractionation was done by a sequential extraction with CaCl2, NaHCO3, NaOH, HCl, and HNO3+ HClO4(residual). Addition of biosolids from both cities to the soil decreasedQmaxand the binding energy obtained by the Langmuir equation. SS additions changed the P fractions distribution in the soil by increasing the labile fractions (P-CaCl2and P-NaHCO3) and the moderately labile fraction (P-NaOH) by 11.2% and 20.3%, respectively, in detriment of the most resistant P fraction.

scholarly journals Phosphorus sorption properties of deposits from peat-muck soil profile in the Kuwasy object

2012 ◽  
Vol 16 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Barbara Sapek
Keyword(s):  
Sorption Capacity ◽  
Soil Profile ◽  
Sorption Properties ◽  
Phosphorus Sorption ◽  
Phosphorus Adsorption ◽  
Maximum Sorption Capacity ◽  
Peat Deposits ◽  
Muck Soil ◽  
Maximum Sorption ◽  
Transformation Of Organic Matter

Abstract Sorption capacity and the energy of phosphorus adsorption on muck and peat deposits were studied in peat- -muck soil profile from a lowland peatland in the Kuwasy object. Soils of the area are characterised by a laminar structure which results in variable sorption properties of peat deposits of different origin, degree of humification (decomposition - R) and transformation of organic matter of upper muck layers (degree of mucking - Z). There was a relationship between the maximum phosphorus adsorption calculated from the Langmuir isotherm (b) and adsorption energy (k) and the type and degree of humification of peat and transformation of muck mass. Muck deposits of the maximum sorption capacity similar to that of peat deposits bind phosphorus less intensively than peats. One may expect that different sorption capacity and the strength of phosphorus binding will effect in different migration of inorganic and organic P compounds in soil profile and their transfer to ground waters.

scholarly journals Removal of Salicylic and Ibuprofen by Hexadecyltrimethylammonium-Modified Montmorillonite and Zeolite

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 898
Author(s):  
Jiyeon Choi ◽  
Won Sik Shin
Keyword(s):  
Sorption Isotherms ◽  
Organic Carbon Content ◽  
Sorption Data ◽  
Maximum Sorption Capacity ◽  
Ideal Adsorbed Solution Theory ◽  
Modified Montmorillonite ◽  
Maximum Sorption ◽  
Competitive Model ◽  
Sorption Mechanisms ◽  
Positively Charged

The removal of salicylic acid (SA) and ibuprofen (IB) by sorption onto HDTMA-modified montmorillonite (HM) and zeolite (HZ) was investigated at pH 7. The single sorption data were fitted well by the Freundlich, Langmuir, Dubinin−Radushkevich (DR), and Polanyi−Dubinin−Manes (PDM) models (R2 > 0.94). The sorption affinity of Freundlich and the maximum sorption capacity of Langmuir and PDM models of pharmaceuticals onto HM were consistently higher than that of HZ mainly owing to the higher organic carbon content. In addition, the KF, qmL, and qm values were in the order of IB > SA owing to higher hydrophobicity and molar volume. Since the predominant speciation of SA and IB is anionic at pH 7 (>pKa), sorption onto HM occurs mainly by the two-dimensional surface adsorption onto the pseudo-organic medium in the HM, whereas the interaction of anionic pharmaceuticals with the positively charged “head” of HDTMA is responsible for HZ. Sorption isotherms were fitted well by the PDM model, which indicated that pore-filling was one of the dominating sorption mechanisms. The extended Langmuir model, modified Langmuir competitive model, and ideal adsorbed solution theory employed with Freundlich and Langmuir sorption models were applied to predict binary sorption. The effect of competition between the solutes was clearly evident in the characteristic curves; the maximum sorbed volume (qv.m) was reduced, and the sorbed volume (qv) had a wider distribution toward the sorption potential density.

scholarly journals Efficient Recovery of Rare Earth Elements (Pr(III) and Tm(III)) From Mining Residues Using a New Phosphorylated Hydrogel (Algal Biomass/PEI)

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 294
Author(s):  
Chunlin He ◽  
Khalid A.M. Salih ◽  
Yuezhou Wei ◽  
Hamed Mira ◽  
Adel A.-H. Abdel-Rahman ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ph Effect ◽  
Sorption Isotherms ◽  
Uptake Kinetics ◽  
Raw Material ◽  
Selective Precipitation ◽  
Maximum Sorption ◽  
Efficient Recovery ◽  
Mining Residues

With the target of recovering rare earth elements (REEs) from acidic leachates, a new functionalized hydrogel was designed, based on the phosphorylation of algal/polyethyleneimine beads. The functionalization strongly increased the sorption efficiency of the raw material for Pr(III) and Tm(III). Diverse techniques were used for characterizing this new material and correlating the sorption performances and mechanisms to the physicochemical structure of the sorbent. First, the work characterized the sorption properties from synthetic solutions with the usual procedures (study of pH effect, uptake kinetics, sorption isotherms, metal desorption and sorbent recycling, and selectivity from multi-element solutions). Optimum pH was found close to 5; sorption isotherms were fitted by the Langmuir equation (maximum sorption capacities close to 2.14 mmol Pr g−1 and 1.57 mmol Tm g−1). Fast uptake kinetics were modeled by the pseudo-second order rate equation. The sorbent was highly selective for REEs against alkali-earth and base metals. The sorbent was remarkably stable for sorption and desorption operation (using 0.2 M HCl/0.5 M CaCl2 solutions). The sorbent was successfully applied to the leachates of Egyptian ore (pug leaching) after a series of pre-treatments (precipitation steps), sorption, and elution. The selective precipitation of REEs using oxalic acid allows for the recovery of a pure REE precipitate.

Sorption Properties of Nanostructured Calcium Aluminosilicate with Respect to Cesium Ions

2017 ◽  
Vol 265 ◽  
pp. 518-523
Author(s):  
P.S. Gordienko ◽  
S.B. Yarusova ◽  
I.A. Shabalin ◽  
V.A. Dostovalov
Keyword(s):  
Living Environment ◽  
Sorption Properties ◽  
Half Cycle ◽  
Maximum Sorption Capacity ◽  
Cesium Ions ◽  
Ion Sorption ◽  
Maximum Sorption ◽  
Calcium Aluminosilicate ◽  
The Impact ◽  
Calcium Aluminosilicates

Long–lived 134Cs and 137Cs isotopes with half-cycle of 2.06 and 30 years respectively refer to the most dangerous and wide-spread radionuclides in ecological facilities. The efficient way of removing cesium radioisotopes from the living environment is to bind them into the compounds insoluble in water. This paper presents the findings on the sorption properties of synthetic nanostructured calcium aluminosilicates (CAS) with AI:Si correlation equal to 2:2, 2:6, 2:10 and obtained in CaCI2—AICI3—КОН--SiO2—H2O multiple-component system. An isotherm investigation of cesium ion sorption produced from aqueous solution with Cs+1 from 0.2 till 6.0 mmol/L-1 concentration was carried out. Maximum sorption capacity of calcium aluminosilicates (CAS) as well as Langmuir constant was defined. The kinetics data was received and the activation energy of cation exchange in the process of sorption was estimated. The impact of 1% КCI + 6% NaCI saline background on the values of interfacial distribution coefficient (Kd) and recovery rate of cesium ions were determined.

scholarly journals GRANULATED SORPTION MATERIALS FOR WASTE WATERS PURUFUCATION FROM ZINK IONS (Zn2+)

2017 ◽  
Vol 60 (7) ◽  
pp. 85 ◽  
Author(s):  
Natalia A. Politaeva ◽  
Vladimir V. Slugin ◽  
Elena A. Taranovskaya ◽  
Ivan N. Alferov ◽  
Maksim A. Soloviev ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Market Price ◽  
Sorption Properties ◽  
Waste Waters ◽  
Maximum Sorption Capacity ◽  
Heat Treated ◽  
Maximum Sorption ◽  
High Sorption ◽  
The Cost ◽  
Different Content

The article describes the main applications of biopolymer – chitosan, the most important of which are medicine and food industry. In recent times, many works devoted to the application of chitosan for wastewater treatment because it has a flocculation and sorption properties. The market price of chitosan is high, so it is proposed to create a granular composite sorption materials based on chitosan and waste of agricultural processing, which will reduce the cost and improve the sorption properties. As waste agricultural processing is proposed to use heat-treated threshing of millet which has high sorption properties. The composites, where the binder is chitosan and the filler - heat-treated threshing millet with different content (10 %; 20 %; 30 %; 40 % of the total weight) were obtained. The adsorption isotherms of zinc ions on the composite adsorbent materials with different content of filler were constructed and the values of maximum sorption capacity were calculated. The mechanical properties (abrasion and grindability) of the obtained composite sorption materials were determined and it was shown that the best sorption characteristics of composite material with the addition of the filler for 30%. The technological scheme of production of composite materials of the heat-treated millet threshing and chitosan for wastewater treatment was developed. The microstructural study of the obtained materials showed that heat-treated additive threshing of millet increases. The economic indicators of production of composite sorption materials were calculated and the methods of disposal were examined.Forcitation:Politaeva N.A., Slugin V.V., Taranovskaya E.A., Alferov I.N., Soloviev M.A., Zakharevich A.M. Granulated sorption materials for waste waters purufucation from zink ions (Zn2+). Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 7. P. 85-90.

Efficient uptake of perrhenate/pertechnenate from aqueous solutions by the bifunctional anion-exchange resin

2018 ◽  
Vol 106 (7) ◽  
pp. 581-591 ◽  
Author(s):  
Jie Li ◽  
Lin Zhu ◽  
Chengliang Xiao ◽  
Lanhua Chen ◽  
Zhifang Chai ◽  
...  
Keyword(s):  
Anion Exchange ◽  
High Selectivity ◽  
Sorption Properties ◽  
Maximum Sorption Capacity ◽  
Anion Exchange Resins ◽  
Wide Range ◽  
Maximum Sorption ◽  
Chain Group ◽  
Efficient Uptake ◽  
Exchange Resins

Abstract In this work, batch experiments were carried out to explore the sorption properties for perrhenate (ReO4−, a surrogate for TcO4−) by two types of commercial bifunctional anion-exchange resins (Purolite A530E and A532E). It is found that these two bifunctional anion-exchange resins could rapidly remove ReO4− from aqueous solution within 150 min and the maximum sorption capacity for ReO4− reached as high as 707 and 446 mg/g for Purolite A530E and A532E, respectively. The sorption properties were independent of pH over a wide range from 1 to 13. More importantly, both Purolite A530E and A532E exhibited excellent selectivity for the removal of ReO4− in the presence of large excess of NO3− and SO42−. Finally, the removal percentage of ReO4− by these two resins could be >90% and 80%, respectively, from the Hanford low-level waste melter off-gas scrubber simulant stream. Such high selectivity of Purolite A530E and A532E for the removal of ReO4− might be due to the presence of the long-chain group of –[N(Hexyl)3]+, which favored hydrophobic and large anions such as ReO4−/TcO4− rather than NO3−.

scholarly journals PURIFICATION OF FE3+ CONTAINING WASTEWATER USING NATURAL SORBENTS

2020 ◽  
Vol 20 ◽  
pp. 101-105
Author(s):  
K. Stepova ◽  
L. Sysa ◽  
I. Vintonyk
Keyword(s):  
High Frequency ◽  
Bentonite Clay ◽  
Sorption Equilibrium ◽  
Natural Sorbents ◽  
Ultra High Frequency ◽  
Maximum Sorption Capacity ◽  
Treated Sample ◽  
Maximum Sorption ◽  
Pre Treatment ◽  
Static Conditions

Abstract. Bentonites in natural or activated forms, i.e. after chemical treatment with acids, have high adsorption properties and are widely used as a natural adsorbent. The increase in the adsorption capacity of bentonite sorbents during heat treatment at 100–200 ° C is caused by the removal of adsorbed and chemical water that leads to an increase in the overall porosity. By thermal and hydrothermal treatments, the properties of natural sorbents can be varied within wide limits, giving them selectivity with respect to certain dissolved substances. It is known that the irradiation of water systems by microwaves leads to their heating, that is, this method of pre-treatment of sorbents combines their hydro-thermal treatment with high-frequency irradiation. The aim of the work is to investigate the process of absorption of iron (III) by bentonite clay under the influence of microwave radiation. The sorption properties of bentonites were studied under static conditions. For comparison purposes, adsorption was performed on natural bentonite under normal conditions without any pre-treatment and under the action of ultra-high-frequency electromagnetic radiation. The Langmuir equation was used to describe the experimental adsorption isotherms. The maximum sorption capacity of the treated sample was found to be 1.66 times higher than that of the untreated one and was 63.7 and 38.3 mg / g, respectively. The sorption equilibrium constant of the irradiated sample is 42% lower than that of the native one. This indicates that the sorption equilibrium under the action of ultra-high frequency radiation comes in 1.7 times faster than under normal conditions. Therefore, compared to the untreated sample, microwave irradiated bentonite has better sorption characteristics for iron (III), so it can be a promising sorbent for the purification of natural and wastewater.

scholarly journals Studies on chromium(III) removal from aqueous solutions by sorption on Sphagnum moss peat

2009 ◽  
Vol 74 (8-9) ◽  
pp. 953-964 ◽  
Author(s):  
Catalin Balan ◽  
Doina Bilba ◽  
Matei Macoveanu
Keyword(s):  
Aqueous Solutions ◽  
Metal Ion ◽  
Sorption Isotherms ◽  
Second Order ◽  
Ion Concentration ◽  
Sphagnum Moss ◽  
Order Kinetic ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order

Batch sorption experiments were performed for the removal of chromium(III) ions from aqueous solutions using Romanian Sphagnum moss peat (untreated and treated with NaCl solution) as sorbent. In order to establish the best conditions for the sorption of chromium(III), the influence of initial pH, contact time, peat dose and metal ion concentration was investigated. The Freundlich, Langmuir and Dubinin-Radushkevich models were applied to describe the sorption isotherms and to calculate its constants. The experimental data fitted well to the Langmuir model with a maximum sorption capacity of 18.6 mg Cr(III)/g of peat. The mean free energy of sorption suggests that the binding of Cr(III) on peat occurred through an ion exchange mechanism. The kinetic data evaluated by pseudo-first order and pseudo-second order kinetic models showed that the sorption of chromium onto the peat followed a pseudo-second order rate equation. The chromium(III) could be easily eluted from the loaded peat using 0.10 M HCl and the peat may be reused in several sorption/ desorption cycles. The experimental results indicated the potential of Sphagnum moss peat for removal of Cr(III) from wastewaters.

scholarly journals Application of Langmuir and Dubinin–Radushkevich models to estimate methane sorption capacity on two shale samples from the Upper Triassic Chang 7 Member in the southeastern Ordos Basin, China

2016 ◽  
Vol 35 (1) ◽  
pp. 122-144 ◽  
Author(s):  
Lei Chen ◽  
Zhenxue Jiang ◽  
Keyu Liu ◽  
Wenming Ji ◽  
Pengfei Wang ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Ordos Basin ◽  
Sorption Isotherms ◽  
Upper Triassic ◽  
Organic Carbon Content ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Methane Sorption ◽  
Temperature And Pressure ◽  
Increasing Temperature

A series of methane sorption isotherms were measured at 303 K, 313 K, 323 K, 333 K, and 343 K at pressures up to 12.0 MPa for two shale samples from the Upper Triassic Chang 7 Member in the southeastern Ordos Basin with total organic carbon content values of 5.15% and 4.76%, respectively. Both the Langmuir- and Dubinin–Radushkevich-based excess sorption models were found to well represent the excess sorption isotherms within the experimental pressure range. The maxima of absolute methane sorption capacity fitted by both models are not significantly different. In the current study, the effects of temperature and pressure on methane sorption capacity support the findings that under isothermal condition, methane sorption capacity of organic shale goes up with increasing pressure and under isobaric condition, while it goes down with increasing temperature. Good negative linear relationships between temperature and maximum sorption capacity exist both in the Langmuir and the Dubinin–Radushkevich models. In addition, a good positive linear relation exists between the reciprocal of temperature and the natural logarithm of Langmuir pressure, which indicate that temperature and pressure are really important for methane sorption capacity. The extended Langmuir and Dubinin–Radushkevich models have been improved to calculate the methane sorption capacity of shales, which can be described as a function of temperature and pressure. By means of using the two estimation algorithms established in this study, we may draw the conclusion methane sorption capacity can be obtained as a function of depth under geological reservoir. Due to the dominant effect of pressure, methane sorption capacity increases with depth initially, till it reaches a maximum value, and then decrease as a result of the influence of increasing temperature at a greater depth. Approximately, the maximum sorption capacity ranges from 400 m to 800 m.

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