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

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.

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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

Energy Exploration & Exploitation ◽

10.1177/0144598716684309 ◽

2016 ◽

Vol 35 (1) ◽

pp. 122-144 ◽

Cited By ~ 15

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

Gels ◽

10.3390/gels6020012 ◽

2020 ◽

Vol 6 (2) ◽

pp. 12 ◽

Cited By ~ 3

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.

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Equilibrium and kinetics study on removal of arsenate ions from aqueous solution by CTAB/TiO2 and starch/CTAB/TiO2 nanoparticles: a comparative study

Journal of Water and Health ◽

10.2166/wh.2016.127 ◽

2016 ◽

Vol 15 (1) ◽

pp. 58-71

Author(s):

Pankaj Gogoi ◽

Debasish Dutta ◽

Tarun Kr. Maji

Keyword(s):

Comparative Study ◽

Tio2 Nanoparticles ◽

Removal Rate ◽

Ammonium Bromide ◽

X Ray ◽

Maximum Sorption Capacity ◽

Ion Removal ◽

Maximum Sorption ◽

Equilibrium And Kinetics ◽

Sorption Mechanisms

We present a comparative study on the efficacy of TiO2 nanoparticles for arsenate ion removal after modification with CTAB (N-cetyl-N,N,N-trimethyl ammonium bromide) followed by coating with starch biopolymer. The prepared nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), thermogravimetry, scanning electron microscopy (SEM) and electron dispersive X-ray analysis (EDX). The removal efficiency was studied as a function of contact time, material dose and initial As(V) concentration. CTAB-modified TiO2 showed the highest arsenate ion removal rate (∼99% from 400 μg/L). Starch-coated CTAB-modified TiO2 was found to be best for regeneration. For a targeted solution of 400 μg/L, a material dose of 2 g/L was found to be sufficient to reduce the As(V) concentration below 10 μg/L. Equilibrium was established within 90 minutes of treatment. The sorption pattern followed a Langmuir monolayer pattern, and the maximum sorption capacity was found to be 1.024 mg/g and 1.423 mg/g after starch coating and after CTAB modification, respectively. The sorption mechanisms were governed by pseudo second order kinetics.

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

Applied and Environmental Soil Science ◽

10.1155/2011/283061 ◽

2011 ◽

Vol 2011 ◽

pp. 1-7 ◽

Cited By ~ 4

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.

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Sorption capacity of phosphate in mineral soils: I Estimation of sorption capacity by means of sorption isotherms

Agricultural and Food Science ◽

10.23986/afsci.72918 ◽

1990 ◽

Vol 62 (1) ◽

pp. 1-8

Author(s):

Raina Niskanen

Keyword(s):

Ionic Strength ◽

Sorption Capacity ◽

Sorption Isotherms ◽

Clay Content ◽

Langmuir Equation ◽

Soil Samples ◽

Organic Carbon Content ◽

Sorption Data ◽

Mineral Soils ◽

Extractable Al

The sorption capacity of phosphate in seven soil samples (clay content 1—70 %, organic carbon content 0.8—10.7 %, soil pH 4.2—5.3, oxalate-extractable Al 11—222 and Fe 11—202 mmol/kg soil) was studied by means of sorption isotherms. The soils were equilibrated, for two to seven days at +5 and +20°C, with solutions containing phosphate 0—10 mmol/l (0—200 mmol/kg soil) at a constant ionic strength of 0.01 . Prolongation of the reaction time increased the sorption of phosphate only partially. The rise in temperature, from +5 to +20°C, increased the sorption from higher phosphate concentrations. At +20°C, the sorption curves of three soils showed a sorption maximum of 4, 19 and 34 mmol/kg soil. The sorption data of six soils was in accordance with the Langmuir equation; the sorption maximum ranged from 15 to 119 mmol/kg soil, and were of the same magnitude as the maximums determined experimentally.

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Competitive and Noncompetitive Batch Sorption Studies of Aqueous Cd(II) and Pb(II) Uptake ontoCoffea canephoraHusks,Cyperus papyrusStems, andMusaspp. Peels

Journal of Chemistry ◽

10.1155/2015/696098 ◽

2015 ◽

Vol 2015 ◽

pp. 1-17

Author(s):

G. K. Bakyayita ◽

A. C. Norrström ◽

R. N. Kulabako

Keyword(s):

Metal Ions ◽

Synergistic Effects ◽

Coffea Canephora ◽

Exchange Capacity ◽

Competitive Sorption ◽

Order Kinetic ◽

Sorption Data ◽

Maximum Sorption ◽

Order Kinetic Model ◽

Sorption Mechanisms

Coffea canephora,Cyperus papyrus,andMusaspp. were studied for competitive and noncompetitive removal of aqueous Cd2+and Pb2+. The optimal conditions were pH 4.5 and agitation time 3.0 hours. Biomass constituent ions showed no interference effects whereas cation exchange capacity values corresponded to the sorption efficiencies. XRD spectroscopy revealed surface oxygen and nitrogen groups that provide binding sites for metal ions. The maximum sorption efficiency ranges for metal ions in noncompetitive media were 95.2–98.7% forC. canephora, 42.0–91.3% forC. papyrus,and 79.9–92.2% forMusaspp. and in competitive sorption 90.8–98.0% forC. canephora, 19.5–90.4% forC. papyrus,and 56.4–89.3% forMusaspp. The Pb2+ions uptake was superior to that of Cd2+ions in competitive and noncompetitive media. In competitive sorption synergistic effects were higher for Cd2+than Pb2+ions. The pseudo-second-order kinetic model fitted experimental data with0.917≤R2≥1.000for Pb2+ions and0.711≤R2≥0.999for Cd2+ions. The Langmuir model fitted noncompetitive sorption data with0.769≤R2≥0.999; moreover the Freundlich model fitted competitive sorption data with0.867≤R2≥0.989. Noncompetitive sorption was monolayer chemisorption whereas competitive sorption exhibited heterogeneous sorption mechanisms.

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Enhanced Removal of Lead by Chemically and Biologically Treated Carbonaceous Materials

The Scientific World JOURNAL ◽

10.1100/2012/604198 ◽

2012 ◽

Vol 2012 ◽

pp. 1-11 ◽

Cited By ~ 8

Author(s):

Mohamed E. Mahmoud ◽

Maher M. Osman ◽

Somia B. Ahmed ◽

Tarek M. Abdel-Fattah

Keyword(s):

Active Carbon ◽

Isotherm Models ◽

Infrared Analysis ◽

Carbonaceous Materials ◽

Maximum Sorption Capacity ◽

Maximum Sorption ◽

Potential Applications ◽

Microscope Imaging ◽

Carbonaceous Sorbents ◽

Sorption Mechanisms

Hybrid sorbents and biosorbents were synthesized via chemical and biological treatment of active carbon by simple and direct redox reaction followed by surface loading of baker’s yeast. Surface functionality and morphology of chemically and biologically modified sorbents and biosorbents were studied by Fourier Transform Infrared analysis and scanning electron microscope imaging. Hybrid carbonaceous sorbents and biosorbents were characterized by excellent efficiency and superiority toward lead(II) sorption compared to blank active carbon providing a maximum sorption capacity of lead(II) ion as 500 μmol g−1. Sorption processes of lead(II) by these hybrid materials were investigated under the influence of several controlling parameters such as pH, contact time, mass of sorbent and biosorbent, lead(II) concentration, and foreign ions. Lead(II) sorption mechanisms were found to obey the Langmuir and BET isotherm models. The potential applications of chemically and biologically modified-active carbonaceous materials for removal and extraction of lead from real water matrices were also studied via a double-stage microcolumn technique. The results of this study were found to denote to superior recovery values of lead (95.0–99.0±3.0–5.0%) by various carbonaceous-modified-bakers yeast biosorbents.

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Sorption behavior of Florisil for the removal of antimony ions from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2011.497b ◽

2011 ◽

Vol 63 (10) ◽

pp. 2114-2122 ◽

Cited By ~ 4

Author(s):

Lei Zhang ◽

Qing Lin ◽

Xingjia Guo ◽

Francis Verpoort

Keyword(s):

Aqueous Solutions ◽

Sorption Isotherms ◽

Sorption Behavior ◽

Order Kinetic ◽

Sorption Data ◽

Maximum Sorption ◽

Boundary Layer Diffusion ◽

Intra Particle Diffusion ◽

Order Kinetic Model ◽

The Mean

Florisil was employed for the sorption of antimony ions from aqueous solutions. A detailed study of the process was performed by varying the sorption time, pH, and temperature. The sorption was found to be fast, equilibrium was reached within 15 min. Moreover, a maximum sorption has been achieved from solution when the pH ranges between 1–10. From kinetic experiments it follows that the process correlate with the second-order kinetic model. The overall rate process appears to be influenced by both boundary layer diffusion and intra-particle diffusion. The Langmuir and Dubinin-Radushkevich (D-R) type sorption isotherms can be applied to fit and interpret the sorption data. The mean energy of adsorption (9.73 kJ mol−1) was calculated from the Dubinin-Radushkevich (D-R) adsorption isotherm at room temperature. Furthermore, the thermodynamic parameters for the sorption were also determined, and the ΔH0 and ΔG0 values indicate a spontaneous endothermic behavior.

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Application of biochar from crop residues for the removal of lead and copper

10.5194/egusphere-egu2020-2662 ◽

2020 ◽

Author(s):

José M. De la Rosa ◽

Águeda Sánchez-Martín ◽

María L. Sánchez-Martín ◽

Nikolas Hagemann ◽

Heike Knicker ◽

...

Keyword(s):

Trace Elements ◽

Removal Efficiency ◽

Crop Residues ◽

Copper Ions ◽

Batch Adsorption ◽

Sorption Data ◽

Initial Concentration ◽

Maximum Sorption Capacity ◽

Removal Capacity ◽

Maximum Sorption

Due to the chemical composition and surface properties of biochar, a C-rich porous material produced by pyrolysis of biomass, it can act as an effective tool for the remediation of soils polluted with trace elements [1, 2]. However, its capacity to sorb these contaminants in a solution varies considerably depend on pyrolysis conditions, but also on the feedstock. &#160;Thus, the major aim of this study is to evaluate the capacity of biochars from two crop residues to sorb Pb2+ and Cu2+.For this purpose, rice husk and olive pit biochars (RHB and OPB, respectively) were produced in a continuously feed reactor (Pyreka reactor, max. temperature 500 &#186;C, residence time 12 min; N2 atmosphere).The efficiency of lead and copper ions (Pb&#178;&#8314;, Cu2+) removal by the biochars was investigated through batch adsorption experiments. 20 mL of single-metal solutions with 0.05, 0.1, 0.5, 1, 2 and 5 mM of initial concentration of Pb2+ and Cu2+ were mixed with 20 mg of milled biochar during 48 h. After filtering at 0.45 &#181;m, their concentrations were measured by ICP-OES (Varian ICP 720-ES, Varian Inc., CA, USA).Removal efficiency of both heavy metals was over 80 % for RHB and OPB when the initial cation concentration was &#8804; 0.5 mM. RHB removal capacity was 26 % for Cu2+ and 35 % for Pb2+ when the initial concentration of metal was 5 mM, whereas OPB removal capacity for both cations was lower than 20 %. The adsorption data fitted well to a Langmuir model for both cations for RHB as other authors found [3]. Although, the Langmuir maximum sorption capacity obtained in this work for Cu2+ was similar to that obtain by Samsuri et al. (2014) [3], it was lower for Pb2+. However, sorption data for OPB better fitted to a Temkin isotherm model for Cu2+ and Freundlich model for Pb2+.The selection of the adequate biomass to produce biochars for the immobilization of trace elements, as Pb and Cu, in soils is very important, due to the huge differences in their adsorption efficiency. RHB showed a greater removal efficiency for Cu2+ and Pb2 than OPB.References:[1] Uchimiya, M., Klasson, K.T., Wartelle, L.H., Lima, I.M., 2011. Chemosphere 82, 1438-1447.[2] Zhao, J., Shen, X.-J., Domene, X., Alca&#241;iz, J.-M., Liao, X., Palet, C., 2019. Sci. Rep. 9, 9869.[3] Samsuri, A.W., Sadegh-Zadeh, F., She-Bardan, B.J., 2014. Int. J. Environ. Sci. Technol. 11, 967.Acknowledgements:The former Spanish Ministry of Economy, Industry and Competitiveness (MINEICO) and AEI/FEDER are thanked for funding the project CGL2016-76498-R (BIOREMEC). P. Campos thanks the &#8220;Fundaci&#243;n Tatiana P&#233;rez de Guzm&#225;n el Bueno&#8221; for funding her PhD.

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Nickel (II) sorption from aqueous media by Agave salmiana as biosorbent

Journal of Applied Research and Technology ◽

10.22201/icat.16656423.2019.17.3.813 ◽

2019 ◽

Vol 17 (3) ◽

Author(s):

D. M. Sánchez Nava ◽

H. López González ◽

M. T. Olguín ◽

S. Bulbulian

Keyword(s):

Heavy Metal ◽

Aqueous Media ◽

Second Order ◽

Order Kinetic ◽

Sorption Data ◽

Maximum Sorption Capacity ◽

Maximum Sorption ◽

Agave Salmiana ◽

Order Kinetic Model ◽

Pseudo Second Order

In this work, the removal of nickel from aqueous solutions by Agave salmiana was investigated. For this purpose the removal of this heavy metal (Ni2+) was carried out in a batch system as a function of contact time, pH, and the initial concentration of the metallic specie in solution. The sorption data were fitted to pseudo-first order and pseudo-second order kinetic models to found the parameteres which describe the processes. It was found that the maximum sorption of the Agave for Ni2+ was at pH 10 and pseudo-second order kinetic model well described the biosorption behavior of this heavy metal by the non-living biomass. Furthermore, the maximum sorption capacity obtained from the isotherm was 10 mgNi/gAgave.

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