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Articoli di riviste sul tema "Competitive sorption and desorption"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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1

Kim, J. H., W. S. Shin, Y. H. Kim, S. J. Choi, Y. W. Jeon e D. I. Song. "Sequential sorption and desorption of chlorinated phenols in organoclays". Water Science and Technology 47, n. 9 (1 maggio 2003): 59–64. http://dx.doi.org/10.2166/wst.2003.0492.

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Effect of pH on the sorption and desorption of the chlorinated phenols (2-chlorophenol and 2,4-dichlorophenol) in HDTMA-montmorillonite organoclays was investigated using sequential batch experiments. 2,4-dichlorophenol exhibited higher affinity in both sorption and desorption than 2-chlorophenol at pH 4.85 and 9.15. For both chlorophenols, the protonated speciation (at pH 4.85) exhibited a higher affinity in both sorption and desorption than the predominant deprotonated speciation (about 80% and 95% of 2-chlorophenate and 2,4-dichlophenate anions at pH 9.15, respectively). Desorption of chlorinated phenols was strongly dependent on the current pH regardless of their speciation during the previous sorption stage. No appreciable desorption resistance of the chlorinated phenols was observed in organoclays after sequential desorptions. Affinity of both chlorophenols in bisolute competitive sorption and desorption was reduced compared to that in a single-solute system due to the competition between solutes. The ideal adsorbed solution theory coupled with the single-solute Freundlich model successfully predicted the bisolute competitive sorption and desorption equilibria.

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2

Zemanová, V., L. Trakal, P. Ochecová, J. Száková e D. Pavlíková. "A model experiment: competitive sorption of Cd, Cu, Pb and Zn by three different soils". Soil and Water Research 9, No. 3 (6 agosto 2014): 97–103. http://dx.doi.org/10.17221/50/2013-swr.

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The aim of this study was to evaluate and compare the competitive and individual sorption of Cd, Cu, Pb and Zn on three natural soils: a Gleyic Fluvisol (content of Cd 30, Cu 25, Pb 2297 and Zn 3718 mg/kg), a Gleyic Cambisol (content of Cd 5, Cu 29, Pb 1158 and Zn 180 mg/kg) and a Chernozem (content of Cd 0.4, Cu 36, Pb 75 and Zn 67 mg/kg). For evaluation of the sorption and desorption, the Freundlich isotherms were used. The results of the model experiment confirmed that the sorption from single-metal solution was more effective than sorption under multi-metal conditions, due to competitive effects. In all tested soils sorption of Cd, Cu and Zn decreased with the rate of other competitive metals; the Pb sorption was not affected by other competitive metals in solutions. Moreover, during multi-metal sorption, Zn was significantly desorbed in Cambisol. In general, sorptions of Cu, Pb and Zn were greater in uncontaminated soil compared to contaminated soils. Clear trend of impact of the contamination on Cd sorption was not observed. The results showed the sorption decreasing in order Chernozem > Fluvisol > Cambisol. The sorption was the greatest in uncontaminated soil with low mobility of studied metals.

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Kastelan-Macan, Marija, e Mira Petrovic. "The role of fulvic acids in phosphorus sorption and release from mineral particles". Water Science and Technology 34, n. 7-8 (1 ottobre 1996): 259–65. http://dx.doi.org/10.2166/wst.1996.0630.

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The competitive sorption of phosphates and marine fulvic acids on mineral particles (sand, calcite, bentonite and hematite) has been studied under simulated estuarine conditions. Afterwards, the release and desorption of bound phosphates by solutions containing dissolved fulvic acids was determined. It was found out that due to the favorable sorption of fulvic acids onto minerals studied binding of phosphate was significantly decreased. Desorption experiments showed that fulvic acids, present at high concentration level, similar to that in interstitial water of an oxygenated sediment, increase phosphate desorption by 10-20%.

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4

Kim, Ji-Hoon, Won Sik Shin, Dong-Ik Song e Sang June Choi. "Sequential competitive sorption and desorption of chlorophenols in organoclay". Korean Journal of Chemical Engineering 23, n. 1 (gennaio 2006): 63–70. http://dx.doi.org/10.1007/bf02705693.

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5

Ma, Rui, Tian C. Zhang, Shannon L. Bartelt-Hunt, Bill Kranz, Daniel Snow, Terry Mader, Charles Shapiro et al. "Sorption and Desorption of Testosterone to Agricultural Soils: Inhibition Effects and Competitive Sorption". Proceedings of the Water Environment Federation 2009, n. 14 (1 gennaio 2009): 2624–33. http://dx.doi.org/10.2175/193864709793955050.

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6

Zhang, Hua, e H. Magdi Selim. "COMPETITIVE SORPTION-DESORPTION KINETICS OF ARSENATE AND PHOSPHATE IN SOILS". Soil Science 173, n. 1 (gennaio 2008): 3–12. http://dx.doi.org/10.1097/ss.0b013e31815ce750.

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7

Souza, Matheus Fonseca de, Emanuelle Mercês Barros Soares, Ivo Ribeiro da Silva, Roberto Ferreira Novais e Mailson Félix de Oliveira Silva. "Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils". Revista Brasileira de Ciência do Solo 38, n. 4 (agosto 2014): 1153–61. http://dx.doi.org/10.1590/s0100-06832014000400011.

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The increase of organic acids in soils can reduce phosphorus sorption. The objective of the study was to evaluate the competitive sorption of P and citrate in clayey and sandy loam soils, using a stirred-flow system. Three experiments were performed with soil samples (0-20 cm layer) of clayey (RYL-cl) and sandy loam (RYL-sl) Red Yellow Latosols (Oxisols). In the first study, the treatments were arranged in a 2 × 5 factorial design, with two soil types and five combinations of phosphorus and citrate application (only P; P + citrate; and citrate applied 7, 22, 52 min before P); in the second, the treatments were arranged in a 2 × 2 factorial design, corresponding to two soils and two forms of P and citrate application (only citrate and citrate + P); and in the third study, the treatments in a 2 × 2 × 6 factorial design consisted of two soils, two extractors (citrate and water) and six incubation times. In the RYL-cl and RYL-sl, P sorption was highest (44 and 25 % of P application, respectively), in the absence of citrate application. Under citrate application, P sorption was reduced in all treatments. The combined application of citrate and P reduced P sorption to 25.8 % of the initially applied P in RYL-cl and to 16.7 % in RYL-sl, in comparison to P without citrate. Citrate sorption in RYL-cl and RYL-sl was highest in the absence of P application, corresponding to 32.0 and 30.2 % of the citrate applied, respectively. With P application, citrate sorption was reduced to 26.4 and 19.7 % of the initially applied citrate in RYL-cl and RYL-sl, respectively. Phosphorus desorption was greater when citrate was used. Phosphorus desorption with citrate and water was higher in the beginning (until 24 h of incubation of P) in RYL-cl and RYL-sl, indicating a rapid initial phase, followed by a slow release phase. This suggests that according to the contact time of P with the soil colloids, the previously adsorbed P can be released to the soil solution in the presence of competing ligands such as citrate. In conclusion, a soil management with continuous input of organic acids is desirable, in view of their potential to compete for P sorption sites, especially in rather weathered soils.

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8

Nastasovic, Aleksandra, Slobodan Jovanovic, Antonije Onjia, Zvjezdana Sandic, Ljiljana Malovic, Dragica Jakovljevic e Zorica Vukovic. "The application of macroporous copolymers in the sorption of heavy and precious metals from aqueous solutions". Chemical Industry 60, n. 11-12 (2006): 306–10. http://dx.doi.org/10.2298/hemind0612306n.

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Macroporous crosslinked poly(GMA-co-EGDMA) was synthesized by the suspension copolymerisation and functionalized by the ring-opening reaction of the pendant epoxy groups with ethylene diamine. The porosity parameters (specific pore volume, specific surface area, and pore diameter, which corresponds to half of the pore volume) for the initial and amino-functionalized copolymer samples were calculated from the cumulative pore volume distribution curves obtained by mercury porosimetry. The selectivity, sorption capacity and sorption rate of amino-functionalized poly(GMA-co-EGDMA)-en were determined under static conditions. The sorption of Cu(ll) and Ag(l) ions on poly(GMA-co-EGDMA)-en was very rapid (ti/2 value about 1 min). Slower sorption was observed for Au(lll) ions with a ti/2 value of 6.5 minutes. The different rates of Au(lll), Cu(ll) and Ag(l) sorption could be applied for gold, copper and silver ion separation from mixed solutions. The sorption of Ni(ll) and Cu(ll) ions from galvanic solution under competitive conditions was also fast, with ti/2 values of 0.5 and 2 min, respectively. However, Zn(ll) sorption was considerably slower (a ti/2 of 10 min). Similar results were obtained for galvanic solution under dynamic conditions, i.e., the metal sorption capacities of poly(GMA-co-EGDMA)-en decreased in the order: Ni(ll) > Cu(ll) >> Zn(ll). The reusability of amino-functionalized poly(GMA-co-EGDMA) for Cu(ll) sorption was tested in four sorption/desorption cycles. Regeneration experiments were performed with 0.1 and 1 M H2SO4 showed a Cu(ll) capacity loss of 50 % in the first sorption/desorption cycle. The sorption capacity increased when additional neutralization with 0.1 and 1 M NaOH was performed after each sorption/desorption cycle.

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9

Campillo-Cora, Claudia, Manuel Conde-Cid, Manuel Arias-Estévez, David Fernández-Calviño e Flora Alonso-Vega. "Specific Adsorption of Heavy Metals in Soils: Individual and Competitive Experiments". Agronomy 10, n. 8 (1 agosto 2020): 1113. http://dx.doi.org/10.3390/agronomy10081113.

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The partitioning between the soil solid phase and the soil solution determines the mobility of pollutants like heavy metals. If nonspecific sorption takes place, the reactions are easily reversible and heavy metals are released to soil solution increasing the probability of leaching through soil profile. Mobility and leaching are also favoured if other metals are in the system and competition for specific adsorption sites takes place. In this study, desorption equilibrium experiments were conducted after adsorption ones. The specific adsorption was evaluated through the amounts of the still adsorbed Cu, Pb, Cr, Ni and Zn after desorption experiments in ten different soils. In addition, competition adsorption and desorption binary experiments were conducted for evaluating the metal competition in three of the soils. Pb and Cu are the metals adsorbed and retained in higher amounts in all the studied soils. In slightly neutral soils, Cr is retained in lesser amounts while in acidic soils Zn is the metal less retained. Results showed that despite the high and variable amounts of organic matter in the soils, soil pH is the most important variable in neutral soils. In acidic soils, soil properties different than pH play important roles and specific sorption of Pb is related to the cationic exchange capacity of the soils while that of Zn to the clay content. Instead, the release of Cu during desorption experiments is probably due to the more soluble organic fraction of the soils. The individual retention of Cu, Zn, Ni and Pb is higher than when they are in competition, except if Cr is present. In this case, the amount of those four metals and that of Cr increased. Therefore, the presence of Cr together with cationic heavy metals favoured the adsorption of those metals in multi-metal polluted areas. Specific adsorption is also important during competition as soil affinities increase during competition experiments.

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Nikiforova, T. E., V. A. Kozlov e M. K. Islyaikin. "Regularities and mechanism of heavy metal cations sorption and (or) proton desorption by chitosan from aqueous solutions". Canadian Journal of Chemistry 97, n. 8 (agosto 2019): 621–28. http://dx.doi.org/10.1139/cjc-2018-0384.

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The sorption process of heavy metal ions from aqueous solutions using chitosan flakes and chitosan beads was studied. Chitosan gel beads were prepared using covalent crosslinking of chitosan chains by epichlorohydrin with ionic gelation by sodium tripolyphosphate. The capability of chitosan beads to absorb the heavy metal ions from aqueous solutions was studied, and the physicochemical characteristics of the sorbent were evaluated using SEM and FTIR on the model solution treatment. It was found that competitive proton sorption takes place in acidic media, which results in a transformation of amino groups into inactive ammonium-salt form and decreases in heavy metal sorption onto chitosan from aqueous acidic media. Batch adsorption experiments were performed to examine the influence of various factors such as the initial concentration of metal salts, pH, and agitation duration on the process. It was established that metal ion sorption is pH dependent and has an optimum effect at a pH of 6.0. Following the Langmuir equation, the maximum sorption of Cu2+ions is estimated to be 1,6 mol/kg of modified chitosan. The kinetic study revealed that the adsorption kinetics are well-fitted to the kinetic equation of pseudo second order. Thus, sorption of heavy metal ions by chitosan is considered to be a competitive process that occurs on amino groups of the sorbent with equivalent coordinated participation of metal cations, protons, and anions.

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11

Shechter, Michal, Baoshan Xing, Frank-Dieter Kopinke e Benny Chefetz. "Competitive Sorption−Desorption Behavior of Triazine Herbicides with Plant Cuticular Fractions". Journal of Agricultural and Food Chemistry 54, n. 20 (ottobre 2006): 7761–68. http://dx.doi.org/10.1021/jf0614488.

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12

Covelo, E. F., F. A. Vega e M. L. Andrade. "Competitive sorption and desorption of heavy metals by individual soil components". Journal of Hazardous Materials 140, n. 1-2 (febbraio 2007): 308–15. http://dx.doi.org/10.1016/j.jhazmat.2006.09.018.

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13

Sahraoui, Hamdi, María Luisa Andrade, Mohamed Hachicha e Flora Alonso Vega. "Competitive sorption and desorption of trace elements by Tunisian Aridisols Calcorthids". Environmental Science and Pollution Research 22, n. 14 (14 marzo 2015): 10861–72. http://dx.doi.org/10.1007/s11356-015-4288-y.

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14

Petter, Fabiano André, Tamara Santos Ferreira, Adilson Paulo Sinhorin, Larissa Borges de Lima, Leidimar Alves de Morais e Leandro Pereira Pacheco. "Sorption and desorption of diuron in Oxisol under biochar application". Bragantia 75, n. 4 (29 settembre 2016): 487–96. http://dx.doi.org/10.1590/1678-4499.420.

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ABSTRACT The objective of this study was to verify the kinetics of sorption and desorption of diuron in an Oxisol under application of biochar. The samples were collected in a field experiment conducted in randomized design blocks consisted of 2 base fertilization levels (0 and 400 kg∙ha−1 NPK 00-20-20 fertilizer formula) and 3 doses of biochar (0, 8 and 16 Mg∙ha−1). In the evaluation of sorption and desorption, Batch Equilibrium method was used. The kinetics of sorption and desorption of diuron, total organic carbon, fulvic acid, humic acid and humin, pH and partition coefficient to organic carbon were evaluated. The Freundlich isotherm was adjusted appropriately to describe diuron sorption kinetics in all the studied treatments. The application of biochar provided increment in the sorption (Kf) and reduction in the desorption of diuron in 64 and 44%, respectively. This effect is attributed to the biochar contribution to the total organic carbon and C-humin and of these to diuron through hydrophobic interactions and hydrogen bonds. The positive correlation between the partition coefficient to organic carbon and Kf confirms the importance of soil organic compartment in the sorption of diuron. There was no competition of NPK fertilizer for the same sorption site of diuron. The increase and reduction in sorption and desorption, respectively, show that the application of biochar is an important alternative for the remediation of soil leaching of diuron, especially in sandy soils.

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15

Xiong, X., F. Stagnitti, N. Turoczy, G. Allinson, P. Li, J. Nieber, T. S. Steenhuis et al. "Competitive sorption of metals in water repellent soils: Implications for irrigation recycled water". Soil Research 43, n. 3 (2005): 351. http://dx.doi.org/10.1071/sr04086.

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Australia is a water-stressed nation and demand on potable water supply is increasing. Consequently water conservation and reuse are increasingly becoming important. Irrigation of recycled wastewater on water repellent soils is a technology that is being trialled as a means of improving crop production and conserving potable supply. However, recycled water contains potentially harmful heavy metals. This paper reports the competitive sorption and desorption of several common heavy metals found in soils collected from a farm located in the south-east of South Australia. The soil from this location is severely water repellent, but some sites were amended with kaolinite clay (Si4Al4O10(OH)8) about 7 and 15 years ago. The metals studied were Cu, Pb, Cd, Cr, Ni, and Zn. Competitive sorption of the metals was distinctly observed. For all heavy metals, the quantity of metal sorbed was higher in amended soil, and there was a strong correlation between the specific sorption to total sorption ratio and the amount of clay in the soil. The sorption intensities varied with metal, Cr, Pb, and Cu having a high sorption tendencies and Zn, Cd, and Ni having comparatively low sorption tendencies. The total sorption capacity for all metals increased in clay-treated soils compared with non-treated soils. On average, clay-amended water repellent soils had a 20–40% increased capacity to adsorb total metals; however, this increase was largely caused by the increased capacities to adsorb Zn, Cd, and Ni. The effect of clay treatment largely enhanced the sorption capacity of relatively weakly adsorbing heavy metals. The implications for using recycled wastewater on the long-term sustainable agro-environmental management of these soils are discussed.

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Guzenko, O. M., O. M. Zhukovetska, D. M. Mukienko, V. V. Shopovalenko, A. N. Chebotarev e D. V. Snigur. "SORPTION OF ERYTHROSINE ONTO SILICA GEL MODIFIED BY CETYLPYRIDINIUM BROMIDE". Odesa National University Herald. Chemistry 26, n. 3(79) (24 novembre 2021): 77–85. http://dx.doi.org/10.18524/2304-0947.2021.3(79).240755.

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In the current paper, adsorbent based on silica gel L 40/100 modified with cetylpyridinium bromide was obtained. The presence of cetylpyridinium cations on the silica gel surface was confirmed by the diffuse reflectance infrared fourier transform spectroscopy method. The sorption conditions of erythrosine from dilute aqueous solutions with the proposed sorbent were studied and optimized. It is shown that the use of modified silica gel allows efficient (>95%) extraction of erythrosine from aqueous solutions. Under optimal sorption conditions (pH 7, sorbent dosage 0.1 g and sorption time is 15 min), the sorption capacity of modified erythrosine sorbents was determined. It is shown that, with increasing temperature, a change in the isotherm type from the H‑type to the L‑type is observed. This change can be explained by the aggregation of erythrosin in solution, which is a competitive sorption process. It was shown that adsorption isotherms were well described by the Langmuir equation. Thermodynamic studies have made it possible to establish the spontaneous sorption. The desorption of erythrosine from the surface of silica gel modified with cetylpyridinium bromide was studied. It is shown that when using solutions of sulfuric acid, sodium hydroxide and distilled water, desorption does not occur. It was shown that the most effective eluent is solution of sodium dodecylsulfate in alkaline medium, and desorption of erythrosine occurs due to the destruction of ion pairs of dye anions with cetylpyridinium cations fixed on the surface. The data obtained can then be used to develop a test system for determination of erythrosine via corresponding colorimetric scales or for quantitative solid phase extraction and adsorption-spectroscopic quantification of erythrosine in some real samples.

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Kim, Ji-Hoon, Won Sik Shin, Dong-Ik Song e Sang June Choi. "Multi-Step Competitive Sorption and Desorption of Chlorophenols in Surfactant Modified Montmorillonite". Water, Air, and Soil Pollution 166, n. 1-4 (settembre 2005): 367–80. http://dx.doi.org/10.1007/s11270-005-6329-5.

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Xing, Baoshan. "Sorption of anthropogenic organic compounds by soil organic matter: a mechanistic consideration". Canadian Journal of Soil Science 81, n. 3 (1 agosto 2001): 317–23. http://dx.doi.org/10.4141/s00-067.

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Sorption experiments with apolar organic compounds (naphthalene and 1,2-dichorobenzene) were conducted to evaluate sorption mechanisms in soil organic matter (SOM). All isotherms were nonlinear and competition between solutes was observed. Nonlinearity and competition increased in an order of peat humic acid (HA) < peat < peat humin. Isotherms of Al-saturated HA (Al-HA) were more nonlinear than untreated HA and Ca-HA, and sorption/desorption hysteresis occurred only in Al-HA. These results are not consistent with partitioning theory or the presence of high-surface-area carbonaceous materials (HSACM) in soil. But the results are consistent with dual-mode sorption, where SOM is postulated to have both condensed (rigid) and expanded (flexible) domains, and adsorption takes place only in the condensed domains and partitioning in both domains. These non-ideal sorptive behaviors need to be incorporated into predictive models to more accurately describe the fate and transport of organics in soil and subsurface environments. Key words: sorption, organic compounds, organic matter, dual-mode, partition, mechanisms

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Yean, S., L. Cong, C. T. Yavuz, J. T. Mayo, W. W. Yu, A. T. Kan, V. L. Colvin e M. B. Tomson. "Effect of magnetite particle size on adsorption and desorption of arsenite and arsenate". Journal of Materials Research 20, n. 12 (1 dicembre 2005): 3255–64. http://dx.doi.org/10.1557/jmr.2005.0403.

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Numerous studies have examined arsenic adsorption on varying adsorbents including iron oxides, aluminum hydroxides, alumina, and carbon as a means of arsenic removal in drinking water treatments. The objectives of this study were to evaluate the effect of magnetite particle size on the adsorption and desorption behavior of arsenite and arsenate, and to investigate the competitive adsorption between natural organic matter (NOM) and arsenic. Increases in adsorption maximum capacities for arsenite and arsenate were observed with decreasing magnetite particle size. Arsenic desorption is hysteretic, more so with the smaller nanoparticles. Such desorption hysteresis might result from a higher arsenic affinity for magnetite nanoparticles. In the presence of NOM, substantial decrease in arsenic sorption to magnetite nanoparticles was observed. It would be beneficial to thoroughly investigate adsorption and desorption of arsenic on magnetite nanoparticles for further practical purposes.

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Hwang, Sangchul, e Teresa J. Cutright. "Impact of Clay Minerals and DOM on the Competitive Sorption/Desorption of PAHs". Soil and Sediment Contamination: An International Journal 11, n. 2 (marzo 2002): 269–91. http://dx.doi.org/10.1080/20025891106745.

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Coelho, Gustavo F., Affonso C. GonÇalves, Juan Carlos Nóvoa-Muñoz, David Fernández-Calviño, Manuel Arias-Estévez, María J. Fernández-Sanjurjo, Esperanza Álvarez-Rodríguez e Avelino Núñez-Delgado. "Competitive and non-competitive cadmium, copper and lead sorption/desorption on wheat straw affecting sustainability in vineyards". Journal of Cleaner Production 139 (dicembre 2016): 1496–503. http://dx.doi.org/10.1016/j.jclepro.2016.09.021.

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Li, Tingqiang, Hong Jiang, Xiaoe Yang e Zhenli He. "Competitive sorption and desorption of cadmium and lead in paddy soils of eastern China". Environmental Earth Sciences 68, n. 6 (25 luglio 2012): 1599–607. http://dx.doi.org/10.1007/s12665-012-1853-2.

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Zanin Lima, Jacqueline, Isabela Monici Raimondi Nauerth, Eduardo Ferreira da Silva, Osni José Pejon e Valéria Guimarães Silvestre Rodrigues. "Competitive sorption and desorption of cadmium, lead, and zinc onto peat, compost, and biochar". Journal of Environmental Management 344 (ottobre 2023): 118515. http://dx.doi.org/10.1016/j.jenvman.2023.118515.

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Trakal, L., M. Komárek, J. Száková, V. Zemanová e P. Tlustoš. "Biochar application to metal-contaminated soil: Evaluating of Cd, Cu, Pb and Zn sorption behavior using single- and multi-element sorption experiment". Plant, Soil and Environment 57, No. 8 (2 agosto 2011): 372–80. http://dx.doi.org/10.17221/155/2011-pse.

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The aim of this study was to evaluate metals (Cd, Cu, Pb and Zn) sorption behavior after biochar application into a metal-contaminated soil. Additionally, two different types of biochar originated from the same organic material (contaminated and uncontaminated) at different application rates (1% and 2% w/w) were evaluated as a novelty of the experiment. Batch sorption/desorption experiments were established to compare the sorption behavior of metals originating from single- and multi-element solutions. Zinc as one of the main contaminants in the studied soil was easily desorbed in the presence of Cu, Pb and to a lesser extent by Cd. This desorption was reduced after biochar application. The obtained results proved the different sorption behavior of metals in the single-metal solution compared to the multi-metal ones due to competition effect. Moreover, during multi-element sorption, Zn was significantly desorbed. The applied biochar enhanced Cu and Pb sorption and no changes were observed when contaminated and uncontaminated biochar was used. Furthermore, the application rate (1% and 2% w/w) had no effect as well. In summary, it is needed to point out that the applied rates of biochars were insufficient for metal immobilization in such contaminated soils.

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Fenn, Rachel A., Davie M. Kadyampakeni, Ramdas G. Kanissery, Jonathan Judy e Mahesh Bashyal. "Phosphorus and Glyphosate Adsorption and Desorption Trends across Different Depths in Sandy Soil". Agrochemicals 2, n. 4 (2 ottobre 2023): 503–16. http://dx.doi.org/10.3390/agrochemicals2040028.

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The unintended loss of glyphosate and P from cropland may pose an environmental risk to downstream water quality and marine ecosystems. Glyphosate and P compete for exchange sites, and since glyphosate is an organophosphate, it reacts similarly to phosphates in soil. The competition for exchange sites between glyphosate and P could lead to an increased risk of loss due to leaching, leading to water quality degradation and harm to aquatic wildlife. The focus of this study was to (i) determine the sorption tendencies of P and orthophosphate in Florida Entisols and (ii) determine the sorption tendencies of glyphosate in Florida Entisols. Adsorption and desorption experiments were performed for both P and glyphosate. The data from the sorption experiments were fitted to linear, Freundlich, and Langmuir models. Orthophosphate-P (ortho-P) was best represented by the linear isotherm. Glyphosate adsorption was best represented by the linear isotherm, and desorption was best represented by both the linear and Freundlich models. Phosphorus and glyphosate sorption and desorption increased with soil depth, likely due to the higher concentrations of Fe and Al with greater depth. These results could improve P and glyphosate application rates when applied in tandem to citrus trees, increasing overall tree health and improving soil quality.

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Rocha, Nicoly, e Claudio Mahler. "Analysis of sorption/desorption of cadmium and lead in the legal amazon soils". Soils and Rocks 47, n. 1 (14 dicembre 2023): e2024014022. http://dx.doi.org/10.28927/sr.2024.014022.

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Sorption and desorption tests were carried out for competitive and non-competitive systems with isotherms to verify the presence of Cd and Pb in soils. The soils investigated were: (i) with natural content of organic matter and (ii) with residual content of organic matter. Hydrated nitrate salts of Cd and Pb diluted in 0.01 M calcium nitrate solution in six concentrations were used for the Cd solutions and, for the solutions of Pb, five concentrations. For multielement solutions, mixtures of the simple Cd and Pb solutions in a 1:1 ratio were used. The results of the first stage tests (i) showed good adjustments of the experimental data to the isotherms of Langmuir, Freundlich and Linear, which did not occur for the tests in stage (ii). According to the tests (i), the organic matter was the soil attribute of dominant influence in the sorting mechanisms. The parameters Qo and Kd were adequate to evaluate the adsorption of the studied metals, especially Cd. In step (ii), there was a significant increase in metal retention, especially for element Pb in the samples of Haplic Cambisol (AM) and Red-Yellow Latosol1 (RO), justified by the combined action of (1) increasing the surface area of the mineral fraction, previously covered by organic matter; and (2) increase in soil pH. The Cd element was more bioavailable in relation to the Pb. This was confirmed by the high desorption values observed for Cd. The samples of Haplic Cambisol and Red-Yellow Latosol demonstrated greater capacity to retain Cd and Pb.

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Prata, Fábio, Vanessa Camponez do Brasil Cardinali, Arquimedes Lavorenti, Valdemar Luiz Tornisielo e Jussara Borges Regitano. "Glyphosate sorption and desorption in soils with distinct phosphorus levels". Scientia Agricola 60, n. 1 (febbraio 2003): 175–80. http://dx.doi.org/10.1590/s0103-90162003000100026.

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The sorption of glyphosate by soils occurs due to the inner sphere complex formation with metals of soil oxides, which are related to the soil phosphate adsorption capacity. The aim of this study was to evaluate the effects of increasing rates of phosphorus on sorption and desorption of glyphosate in three soils with different mineralogical attributes. Soils were a Rhodic Kandiudalf, an Anionic Acrudox and a Typic Humaquept. Soil samples were amended with KH2PO4 at equivalent rates of 0; 1,000; 5,000; 20,000 and 50,000 kg ha-1 of P2O5, which are high from the agricultural point of view, but necessary in order to perform sorption and desorption studies. The experimental design consisted of a completely randomized factorial: 2 soils x 5 phosphorus rates and 3 replicates. For the sorption experiments, five glyphosate solutions were employed (0.42; 0.84; 1.68; 3.36 and 6.72 mg L-1), with a 14C radioactivity of 0.233 kBq mL-1. Four steps of the desorption procedure with CaCl2 0.01 mol L-1 and one extraction with Mehlich 3 were performed only at one concentration (0.84 mol L-1). Soil samples were afterwards biologically oxidized to establish the radioactive balance. Glyphosate competes with phosphorus for specific sorption sites, but this competition becomes important when phosphorus is present at rates higher than 1,000 mg dm-3. Moreover, a small amount of applied glyphosate was extracted (<10%), and the extraction increased with increasing soil phosphorus content.

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28

Constantino, Leonel Vinicius, Juliana Nunes Quirino, Taufik Abrão, Paulo Sérgio Parreira, Alexandre Urbano e Maria Josefa Santos. "Sorption–desorption of antimony species onto calcined hydrotalcite: Surface structure and control of competitive anions". Journal of Hazardous Materials 344 (febbraio 2018): 649–56. http://dx.doi.org/10.1016/j.jhazmat.2017.11.016.

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29

Liu, Hwai-Shen, e Yu-Chi Wang. "The sorption of lysozyme and ribonuclease onto ferromagnetic nickel powder 2. Desorption and competitive adsorption". Colloids and Surfaces B: Biointerfaces 5, n. 1-2 (settembre 1995): 35–42. http://dx.doi.org/10.1016/0927-7765(95)01197-q.

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30

Conkle, Jeremy L., Charisma Lattao, John R. White e Robert L. Cook. "Competitive sorption and desorption behavior for three fluoroquinolone antibiotics in a wastewater treatment wetland soil". Chemosphere 80, n. 11 (settembre 2010): 1353–59. http://dx.doi.org/10.1016/j.chemosphere.2010.06.012.

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31

Vega, F. A., E. F. Covelo e M. L. Andrade. "Competitive sorption and desorption of heavy metals in mine soils: Influence of mine soil characteristics". Journal of Colloid and Interface Science 298, n. 2 (giugno 2006): 582–92. http://dx.doi.org/10.1016/j.jcis.2006.01.012.

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32

Mohammed, Ahmed A. "Biosorption of Lead, Cadmium, and Zinc onto Sunflower Shell: Equilibrium, Kinetic, and Thermodynamic Studies". Iraqi Journal of Chemical and Petroleum Engineering 16, n. 1 (30 marzo 2015): 91–105. http://dx.doi.org/10.31699/ijcpe.2015.1.9.

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Abstract (sommario):

The present study deals with the application of an a bundant low cost biosorbent sunflower shell for metal ions removal. Lead, Cadmium and Zinc were chosen as model sorbates. The influences of initial pH, sorbent dosage, contact time, temperature and initial metal ions concentration on the removal efficiency were examined. The single ion equilibrium sorption data were fitted to the non-competitive Langmuir and Freundlich isotherm models. The Freundlich model represents the equilibrium data better than the Langmuir model. In single, binary and ternary component systems,Pb+2 ions was the most favorable component rather than Cd+2 and Zn+2 ions. The biosorption kinetics for the three metal ions followed the pseudo-second order kinetics indicating that the chemical sorption was the rate-limiting step. The thermodynamic parameters including free energy ( G0), enthalpy and entropy changes for Pb2+,Cd2+ and Zn2+ ions indicated that the sorption process was feasible,spontaneous,and endothermic in the temperature range 20-50 0 C .Desorption of the three metals ions from the biosorbent was effectively achieved in a 0.2 mol L-1 HCl solution.

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33

Chen, Su, Lei Chao, Li Na Sun e Tie Heng Sun. "Competition Absorption and Desorption Dynamic Character of Cadmium, Lead and Zinc by Soil in North-East of China". Advanced Materials Research 356-360 (ottobre 2011): 52–58. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.52.

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Abstract (sommario):

The competitive absorption and desorption of cadmium (Cd), lead (Pb) and zinc (Zn) in meadow brown soil from Liaoning province in north-east China was studied in the paper in order to establish the selectivity sequences for the sorption and desorption of these heavy metals in the soil and obtain the absorption and desorption dynamic character of these heavy metals. The results showed that with the increasing of the absorption times, the absorption quantities of Cd, Pb and Zn were increased little by little. The absorption process of Cd, Pb and Zn could be divided into the fast absorption phase and the slow absorption phase. And the fast absorption phases were from the beginning to 60 min, 120 min and 120 min for Cd, Pb and Zn, respectively. The more company metals (i.e. Pb and Zn) existed in the absorption solutions, the less absorption quantities of Cd absorbed by soil. The co-existence of Cd, Pb and Zn had obviously decreased the absorption of Pb by soil. And it was the same situation that Zn absorbed by soil was decreased by the company metals such as Cd, Pb. The company metals had obvious influence on the desorption process of Cd. The existence of Pb and Zn promoted the desorption of Cd. And desorption behavior of Zn was bated by the existence of Pb and Cd. While the company metals Cd and Zn restrained the desorption of Pb. The best equation to describe the absorption and desorption dynamic character of Cd, Pb and Zn was Elovich equation, next was Two–constant equation, and the effect of First-order dynamics equation was not good.

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34

Helios-Rybicka, Edeltrauda, e Rafał Wójcik. "Competitive sorption/desorption of Zn, Cd, Pb, Ni, Cu, and Cr by clay-bearing mining wastes". Applied Clay Science 65-66 (settembre 2012): 6–13. http://dx.doi.org/10.1016/j.clay.2012.06.006.

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35

Gao, Yang, Bo Zhu, Nianpeng He, Guirui Yu, Tao Wang, Weiliang Chen e Jing Tian. "Phosphorus and carbon competitive sorption–desorption and associated non-point loss respond to natural rainfall events". Journal of Hydrology 517 (settembre 2014): 447–57. http://dx.doi.org/10.1016/j.jhydrol.2014.05.057.

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36

Bohdziewicz, J., e G. Kamińska. "Kinetics and equilibrium of the sorption of bisphenol A by carbon nanotubes from wastewater". Water Science and Technology 68, n. 6 (1 settembre 2013): 1306–14. http://dx.doi.org/10.2166/wst.2013.373.

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Abstract (sommario):

The aim of this study was to determine the sorption potential of carbon nanotubes (CNTs) to bisphenol A (BPA) contained in synthetic wastewater whose composition corresponds to biologically treated effluents. These nanotubes differed in their outer diameter, the number of graphene layers and the presence of modifying functional groups. Based on the nitrogen adsorption–desorption isotherms, mensuration of the specific surface area and pore size distribution was undertaken. The porous structure of the CNTs was bidispersive; the majority consisted of micropores, there was an average fraction of mesopores, and macropores did not occur. On the basis of common kinetics models (pseudo-first-order and pseudo-second-order models), a trial of modelling the kinetics of BPA sorption onto nanotubes was undertaken. The experimental data were well fitted only to the pseudo-second-order models. The kinetics study indicated that adsorption of BPA on CNTs proceeded very fast, with the majority of the adsorbate being adsorbed in the first few seconds. The sorption capacity of nanotubes to BPA was the highest for single-walled CNTs. A decrease in the sorption potential of the nanotubes for higher pH values occurred as a result of the deprotonation of the BPA and formation of bisphenolate anions, consequently leading to a decrease of π–π (hydrophobic) interaction and enhancing electrostatic repulsion. Overall, these results unequivocally confirm the ideal performance and potential of nanotubes for removal of micropollutants from synthetic wastewater. Replicating the conditions occurring in real wastewater allows us to expect a high sorption of BPA in real competitive sorption systems.

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37

Nuić, Ivona, Marina Trgo, Nediljka Vukojević Medvidović e Marin Ugrina. "A Mass Transfer Analysis of Competitive Binding of Pb, Cd, and Zn from Binary Systems onto a Fixed Zeolite Bed". International Journal of Environmental Research and Public Health 16, n. 3 (1 febbraio 2019): 426. http://dx.doi.org/10.3390/ijerph16030426.

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Abstract (sommario):

The low-cost natural zeolite clinoptilolite was successfully applied for the competitive removal of Pb, Cd, and Zn from binary (Pb + Zn) and (Cd + Zn) aqueous solutions at different Pb/Zn and Cd/Zn concentration ratios. The obtained efficiency was in the range of 79.0–85.0%, and was similar for both systems, indicating that no loss in capacity was observed for six successive sorption-desorption cycles. In both systems, after the breakthrough, competition between the ions occurs, leading to overshooting in the Zn’s initial concentration, indicating displacement of already-bound Zn with Pb and Cd from the feeding solutions. The Zn exceeded its initial concentration up to 2.3 times in the presence of Pb, and up to 1.2 times in the presence of Cd. The film diffusion was pronounced as the slowest step responsible for the overall process rate. The overall mass transfer coefficient (Ka) shows higher values for the (Cd + Zn) system compared to the (Pb + Zn) one due to reduced competition and ions migration. An SEM-EDS analysis confirmed a higher amount of bound Pb and Cd compared to Zn, and a mapping analysis revealed the equal distribution of all ions onto the zeolite surface.

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38

Kulkarni, Rajeswari M., K. Vidya Shetty e G. Srinikethan. "Kinetic and equilibrium modeling of biosorption of nickel (II) and cadmium (II) on brewery sludge". Water Science and Technology 79, n. 5 (1 marzo 2019): 888–94. http://dx.doi.org/10.2166/wst.2019.090.

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Abstract In the current study, utilization of industrial waste brewery sludge for the biosorption of nickel (II) and cadmium (II) has been explored. The suitable conditions for the effective removal of Ni (II) and Cd (II) from aqueous solutions were examined. The kinetic evaluation showed that the biosorption process using the sludge followed pseudo-second order kinetics. In the presence of a metal co-ion, competitive and preferential biosorption was observed. The Langmuir model and Freundlich model were able to describe the sorption equilibrium for biosorption of Ni (II) and Cd (II) ions in single and dual metal systems. The effects of co-ion concentrations onto mono-component isotherm parameters (Langmuir and Freundlich) were studied and the inhibitory effect of co-ion concentration was observed. The effective reusability of biomass was assessed by three cycles of sorption-desorption. The sludge, owing to its high biosorption intensity and large availability from the local supply, is a better biosorbent for the treatment of Ni (II) and Cd (II) contaminated water.

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39

Kapur, Meghna, e Monoj Kumar Mondal. "Competitive sorption of Cu(II) and Ni(II) ions from aqueous solutions: Kinetics, thermodynamics and desorption studies". Journal of the Taiwan Institute of Chemical Engineers 45, n. 4 (luglio 2014): 1803–13. http://dx.doi.org/10.1016/j.jtice.2014.02.022.

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40

Cerqueira, Beatriz, Emma F. Covelo, Luisa Andrade e Flora A. Vega. "The influence of soil properties on the individual and competitive sorption and desorption of Cu and Cd". Geoderma 162, n. 1-2 (aprile 2011): 20–26. http://dx.doi.org/10.1016/j.geoderma.2010.08.013.

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41

Fernández-Calviño, David, Beatriz Garrido-Rodríguez, Laura Cutillas-Barreiro, Pedro Araújo-Nespereira, Manuel Arias-Estévez, María J. Fernández-Sanjurjo, Esperanza Álvarez-Rodríguez e Avelino Núñez-Delgado. "Influence of mussel shell on As and Cr competitive and non-competitive sorption–desorption kinetics in a mine soil: stirred flow chamber experiments". Geoderma 232-234 (novembre 2014): 300–308. http://dx.doi.org/10.1016/j.geoderma.2014.05.014.

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42

Zhang, Lei, Zhiwei Ye, Mingxue Li, Cun Zhang, Qingsheng Bai e Chen Wang. "The binary gas sorption in the bituminous coal of the Huaibei Coalfield in China". Adsorption Science & Technology 36, n. 9-10 (7 settembre 2018): 1612–28. http://dx.doi.org/10.1177/0263617418798125.

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Abstract (sommario):

Knowledge of the gas sorption characteristics of a coal not only helps to explain the mechanism of enhanced coalbed methane recovery but also provides an important basis for simultaneous coal and gas extraction. In consequence, the pure and binary gas excess sorption capacity of methane, carbon dioxide, and nitrogen of bituminous coal samples derived from the Xutuan Coal Mine in Huaibei coalfield, in Anhui Province in China, was measured using the volumetric method. The fitting analysis of the pure gas Langmuir adsorption model was carried out. The binary gas excess sorption measurement showed that the final sorption capacity of bituminous samples was the same no matter what the gas adsorption order of competitive adsorption and displacement adsorption. Hence, coal gas adsorption is physical adsorption, i.e. the different adsorption and desorption process of gas molecules does not affect the final adsorption amount of coal to each component of gas. Using the fitting parameters obtained by the Langmuir equation, the extended Langmuir equation was used to predict the adsorption capacity for each component of the binary gas. The comparison between predicted adsorption capacity and measured adsorption capacity showed that the extended Langmuir equation can better describe the trend of the adsorption isotherm curves of a binary gas under different pressures. The separation coefficient and displacement coefficient were defined from Langmuir adsorption theory. The separation coefficient involves the proportion of each component in the free phase and the proportion of each component in the adsorption phase. The displacement coefficient involves the displacement ability of gas molecules at adsorption sites by free gas molecules.

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43

Yan, Yulin, Weifang Ma, Yihan Zhang, Chao Nie, Hao Guo e Xiaoxiu Lun. "Competitive sorption and desorption between BDE-47 and BDE-99 by different river- and farmland-based aquifer media". Desalination and Water Treatment 57, n. 60 (4 aprile 2016): 29328–39. http://dx.doi.org/10.1080/19443994.2016.1169221.

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44

Ju, Daeyoung, e Thomas M. Young. "The Influence of Natural Organic Matter Rigidity on the Sorption, Desorption, and Competitive Displacement Rates of 1,2-Dichlorobenzene". Environmental Science & Technology 39, n. 20 (ottobre 2005): 7956–63. http://dx.doi.org/10.1021/es050439x.

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45

Zhao, Dongye, Joseph J. Pignatello, Jason C. White, Washington Braida e Francis Ferrandino. "Dual-mode modeling of competitive and concentration-dependent sorption and desorption kinetics of polycyclic aromatic hydrocarbons in soils". Water Resources Research 37, n. 8 (agosto 2001): 2205–12. http://dx.doi.org/10.1029/2001wr000287.

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46

Xie, Shuang, Zhang Wen, Hongbin Zhan e Menggui Jin. "An Experimental Study on the Adsorption and Desorption of Cu(II) in Silty Clay". Geofluids 2018 (14 agosto 2018): 1–12. http://dx.doi.org/10.1155/2018/3610921.

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Abstract (sommario):

Heavy metals such as Cu(II) are widespread in the environment, and the impact of heavy metals on the environment of soils depends on the ability of soils to immobilize these pollutants. It is necessary to investigate the mechanism of interaction between heavy metal and soil from a soil remediation perspective. In this study, a series of experiments were conducted to investigate the adsorption and desorption behavior of Cu(II) in silty clay. Several impact factors such as pH, organic matter, temperature, and coexisted ions Zn(II) were considered. It was found that the adsorption process reached equilibrium after 4 hours of the experiment, and the data can be fitted well by the Elovich model and the double-constant model for the kinetic sorption process. The isothermal adsorption results showed that the adsorption rate reached a peak value when the initial concentration was about 20 mg L−1. The decrease of H+ can increase the adsorption activity of Cu(II) and reduce the ability of the desorption of Cu(II) ions. The adsorption capacity of Cu(II) is less than the desorption capacity under the condition of strong acidity and low concentration of Cu(II). In addition, the adsorption capacity of the native soil on Cu(II) was larger than that of the soil with the removal of organic matter, while the opposite was true for the desorption capacity on Cu(II). The maximum adsorption of Cu(II) occurred at 35°C for this study, and the binding energy increased as the temperature increased. Thermodynamic analysis revealed that the adsorption process of Cu(II) was spontaneous and endothermic. The Freundlich, Langmuir, Temkin, and Henry adsorption models were used for analyzing the adsorption isotherm of Cu(II), and it was found that the Freundlich model agreed the best with the experimental data compared with other three models. The results of the competitive adsorption experiments indicated that the competitive capacity of Cu(II) was greater than that of Zn(II) in low-permeability media such as silty clay, and the existence of binary metals can weaken the adsorption force between the single metal and the soil surface.

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47

Tighadouini, Said, Smaail Radi, Abderrahman Elidrissi, Khadija Haboubi, Maryse Bacquet, Stéphanie Degoutin, Mustapha Zaghrioui e Yann Garcia. "Removal of toxic heavy metals from river water samples using a porous silica surface modified with a new β-ketoenolic host". Beilstein Journal of Nanotechnology 10 (23 gennaio 2019): 262–73. http://dx.doi.org/10.3762/bjnano.10.25.

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Abstract (sommario):

A new hybrid adsorbent material for the efficient removal of heavy metals from natural real water solutions (Moroccan river water samples) was prepared by the immobilization of a new conjugated β-ketoenol–pyridine–furan ligand onto a silica matrix. The thermodynamical properties including pH, adsorption isotherms, competitive adsorption, selectivity and regeneration were studied to investigate the effect of ketoenol–pyridine–furan–silica (SiNL) on the removal of Zn(II), Pb(II), Cd(II) and Cu(II) from aqueous solutions. An increase in adsorption as a function of pH and fast adsorption was reached within 25 min. The maximum sorption capacities for Zn(II), Pb(II), Cd(II) and Cu(II) were 96.17, 47.07, 48.30 and 32.15 mg·g−1, respectively. Furthermore, the material proved to be very stable – its adsorption capacity remained greater than 98% even after five cycles of adsorption/desorption. Compared to literature results, this material can be considered a high-performing remediation adsorbent for the extraction of Zn(II) from natural real water solution.

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48

Savaskan Yilmaz, Sevil, Nuri Yildirim, Murat Misir, Yasin Misirlioglu e Emre Celik. "Synthesis, Characterization of a New Polyacrylic Acid Superabsorbent, Some Heavy Metal Ion Sorption, the Adsorption Isotherms, and Quantum Chemical Investigation". Materials 13, n. 19 (1 ottobre 2020): 4390. http://dx.doi.org/10.3390/ma13194390.

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Abstract (sommario):

Poly(acrylic acid/Kryptofix 23-Dimethacrylate) superabsorbent polymer [P (AA/Kry23-DM) SAP] was synthesized by solution polymerization to remove Co, Ni, Cu, Cd, Mn, Zn, Pb, Cr, and Fe ions in water and improve the quality of the water. Kry23-DM cross-linker (1,4,7,13,16-Pentaoxa-10,19 diazo cyclohexene icosane di methacrylate) was synthesized using Kry23 and methacryloyl chloride. The characterization of the molecules was done by FTIR, TGA, DSC, and SEM techniques. The effects of parameters such as pH, concentration, and the metal ion interaction on the heavy metal ions uptaking of SAP was investigated. It was observed that P (AA/Kry23-DM) SAP has maximum water absorption, and the absorption increases with the pH increase. Adsorption rates and sorption capacity, desorption ratios, competitive sorption (qcs), and distribution coefficient (log D) of P(AA/Kry23-DM) SAP were studied as a function of time and pH with the heavy metal ion concentration. Langmuir and Freundlich isotherms of the P (AA/Kry23-DM) SAP were investigated to verify the metal uptake. Molecular mechanic (MM2), Assisted Model Building with Energy Refinement (AMBER), and optimized potentials for liquid simulations (OPLS) methods. were used in quantum chemical calculations for the conformational analysis of the cross-linker and the SAP. ΔH0f calculations of the cross-linker and the superabsorbent were made using Austin Model 1(AM1) method.

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49

Gao, J. P., J. Maguhn, P. Spitzauer e A. Kettrup. "Sorption of pesticides in the sediment of the Teufelsweiher pond (Southern Germany). II: Competitive adsorption, desorption of aged residues and effect of dissolved organic carbon". Water Research 32, n. 7 (luglio 1998): 2089–94. http://dx.doi.org/10.1016/s0043-1354(98)00140-7.

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50

Constantino, Leonel Vinicius, Juliana Nunes Quirino, Alessandra Maffei Monteiro, Taufik Abrão, Paulo Sérgio Parreira, Alexandre Urbano e Maria Josefa Santos. "Sorption-desorption of selenite and selenate on Mg-Al layered double hydroxide in competition with nitrate, sulfate and phosphate". Chemosphere 181 (agosto 2017): 627–34. http://dx.doi.org/10.1016/j.chemosphere.2017.04.071.

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