Linking phosphorus sorption and magnetic susceptibility in clays and tropical soils

Soil Research ◽  
2020 ◽  
Vol 58 (5) ◽  
pp. 430 ◽  
Author(s):  
G. C. Poggere ◽  
V. Barrón ◽  
A. V. Inda ◽  
J. Z. Barbosa ◽  
A. D. B. Brito ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Adsorption Capacity ◽  
Tropical Soils ◽  
Maximum Adsorption Capacity ◽  
Phosphorus Sorption ◽  
P Adsorption ◽  
Opposite Trend ◽  
Adsorption Data ◽  
The Relationship ◽  
P Desorption

Maghemite (Mh) and magnetic susceptibility have been little studied in relation to phosphorus (P) sorption, despite the fact that tropical soils – particularly those derived from mafic rocks – may contain substantial amounts of this iron oxide. In this work, we investigated the relationship between P adsorption and magnetic susceptibility in tropical soils, and determined the maximum adsorption capacity of P (MACP) and P desorption in seven pedogenic clays from magnetic soils with contrasting parent materials and three synthetic Mh samples. Considering the heterogeneity of the soil dataset in this study, the exclusive adoption of magnetic susceptibility as an indicator of P adsorption potential in soil remains uncertain. The relationship between magnetic susceptibility and adsorbed P was more evident in the B horizon of red soils from basic igneous rocks. In this group, soils with magnetic susceptibility above 20 × 10−6 m3 kg−1 had high adsorbed P. Although the pedogenic clays exhibited lower MACP values (1353–2570 mg kg–1) than the synthetic Mh samples (3786–4321 mg kg–1), P desorption exhibited the opposite trend (~14% vs ~8%). The substantial P adsorption capacity of synthetic Mh confirmed the adsorption data for pedogenic clays, which were strongly influenced by magnetic susceptibility, Mh and gibbsite contents, and specific surface area.

scholarly journals ADSORÇÃO DE FÓSFORO EM SOLOS DE REGIÕES TROPICAIS

Nativa ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 30-35
Author(s):  
Ana Paula Carrara Vinha ◽  
Bruna Helena Carrara ◽  
Emanuella Farias Santos Souza ◽  
Jussane Antunes Fogaça dos Santos ◽  
Sayonara Andrade C.Moreno Arantes
Keyword(s):  
Organic Matter ◽  
Adsorption Capacity ◽  
Clay Content ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Phosphorus Sorption ◽  
Phosphorus Adsorption ◽  
Adsorption Dynamics ◽  
Tropical Regions ◽  
P Adsorption

O fósforo (P) é o nutriente mais limitante ao cultivo nos solos tropicais, que, geralmente, apresentam alta capacidade de adsorção de P. Alguns atributos químicos e físicos do solo como o teor de argila, pH, CTC efetiva e matéria orgânica influenciam na dinâmica de adsorção. O objetivo deste estudo foi avaliar o processo de adsorção do fósforo em um Latossolo Vermelho Amarelo (LVA) e um Neossolo Quartzarênico (RQ) da região de transição Cerrado-Amazônia, e avaliar os atributos dos solos que influenciam na dinâmica de adsorção do P. Os ensaios de sorção foram realizados pelo método “Batch” ou em batelada e à partir dos dados obtidos foram construídas curvas obtendo a equação linearizada de Langmuir, com as quais foram determinados os valores de capacidade máxima de adsorção de P (CMAP), a constante relacionada com a energia de ligação (KL) e o fator capacidade de P máximo (FCPmáx). Houve diferença na CMAP, KL e FCPmáx dos solos estudados, sendo que os maiores valores foram encontrados no LVA, devido principalmente ao maior teor de argila em relação ao RQ. A matéria orgânica foi um dos poucos atributos que tiveram correlação negativa com os atributos de adsorção, ressaltando sua importância no manejo para aumentar a eficiência da adubação fosfatada. Palavras-chave: Latossolo Vermelho Amarelo; Neossolo Quartzarênico; Isotermas de adsorção.   Phosphorus adsorption in soils of tropical regions   ABSTRACT: Phosphorus (P) is the most limiting nutrient for cultivation in tropical soils, as they generally have high P adsorption capacity. Some chemical and physical attributes of soil such as clay content, pH, effective cation exchange capacity (ECEC) and organic matter influence the adsorption dynamics. The objective of this study was to evaluate the behaviour of the phosphorus adsorption process in a Red-Yellow Latosol and a Quartzarenic Neosol from the Cerrado-Amazon transition region, and to evaluate the soil attributes that influence the adsorption dynamics of the soil of the phosphorus. Sorption tests were performed using the “Bach” method, from the Langmuir linearized equation, the maximum P adsorption capacity (MPAC), the constant with the binding energy (KB) and the maximum capacity factor (PCFmax) were selected. There was a difference in MPAC, KB and PCFmax of the studied soils, and the highest values ​​were found in the Red-Yellow Oxisol, mainly due to the higher clay content in relation to theTypic Quartzipisamment. Organic matter was one of the few attributes that had a negative correlation with the adsorption attributes, highlighting (emphasizing) it’s importance in (soil) management to increase the efficiency of phosphate fertilization. Keywords: Red-Yellow Latosol; Quartzarenic Neosol; adsorption isotherms.

scholarly journals Influence of soil pH on inorganic phosphorus sorption and desorption in a humid brazilian Ultisol

2005 ◽  
Vol 29 (5) ◽  
pp. 685-694 ◽  
Author(s):  
Shinjiro Sato ◽  
Nicholas Brian Comerford
Keyword(s):  
Soil Ph ◽  
Ph Value ◽  
Tropical Soils ◽  
Inorganic Phosphorus ◽  
Phosphorus Sorption ◽  
Tropical Regions ◽  
P Sorption ◽  
Phosphorus Desorption ◽  
P Desorption ◽  
P Bioavailability

Liming is a common practice to raise soil pH and increase phosphorus (P) bioavailability in tropical regions. However, reports on the effect of liming on P sorption and bioavailability are controversial. The process of phosphorus desorption is more important than P sorption for defining P bioavailability. However few studies on the relationship between soil pH and P desorption are available, and even fewer in the tropical soils. The effects of soil pH on P sorption and desorption in an Ultisol from Bahia, Brazil, were investigated in this study. Phosphorus sorption decreased by up to 21 and 34 % with pH increases from 4.7 to 5.9 and 7.0, respectively. Decreasing Langmuir K parameter and decreasing partition coefficients (Kd) with increasing pH supported this trend. Phosphorus desorption was positively affected by increased soil pH by both the total amount of P desorbed and the ratio of desorbed P to initially sorbed P. A decreased K parameter and increased Kd value, particularly at the highest pH value and highest P-addition level, endorsed this phenomenon. Liming the soil had the double effect of reducing P sorption (up to 4.5 kg ha-1 of remaining P in solution) and enhancing P desorption (up to 2.7 kg ha-1 of additionally released P into solution).

scholarly journals Karekterisasi, Kinetika, dan Isoterm Adsorpsi Limbah Ampas Kelapa sebagai Adsorben Ion Cu(II)

SAINTIFIK ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 104-115
Author(s):  
Agusriyadin Agusriyadin
Keyword(s):  
Adsorption Capacity ◽  
Ph Effect ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
Langmuir Adsorption ◽  
Adsorbent Surface ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Penelitian ini bertujuan untuk menguji kemampuan AK dan AKPM dalam mengadsorpsi ion Cu (II), pengaruh parameter adsorpsi dan mekanisme adsorpsi. AK dan AKP Madsorben dibuat dari residu ampas kelapa. Adsorben dikarakterisasi dengan FTIR, SEM dan EDS. Pengaruh parameter adsorpsi seperti pH awal, dosis adsorben, waktu kontak dan konsentrasi ion Cu (II) awal diperiksa untuk menentukan kondisi optimum serapan tembaga (II). Ion Cu (II) yang teradsorpsi diukur berdasarkan pada konsentrasi Ion Cu (II) sebelum dan sesudah adsorpsi menggunakan metode AAS. Hasil karakterisasi menunjukkan bahwa struktur pori dan gugus fungsi tersedia pada permukaan adsorben. Menurut percobaan efek pH, kapasitas adsorpsi maksimum dicapai pada pH 7. Waktu kontak optimal dan konsentrasi tembaga awal (II) ditemukan masing-masing pada 120 menit dan 100 mg L-1. Data eksperimental sesuai dengan model kinetik orde dua orde dua, dan Langmuir isoterm adsorpsi yang diperoleh paling sesuai dengan data adsorpsi. Kapasitas adsorpsi maksimum adsorben ditemukan menjadi 4,73 dan 6,46 mg g-1 pada kondisi optimal. The results of characterization showed that the pore structure and the functional groups were available on adsorbent surface. According to the pH effect experiments, the maximum adsorption capacity was achieved at pH 7. Optimum contact time and initial copper(II) concentration were found at 120 min and 100 mg L-1, respectively. The experimental data were comply with the pseudo-second-order kinetic model, and Langmuir adsorption isotherm obtained best fitted the adsorption data. The maximum adsorption capacity of the adsorbents was found to be 4.73 and 6.46 mg g-1 at optimum conditions.

Adsorption of chromium (VI) from aqueous solutions on activated carbon

1994 ◽  
Vol 30 (9) ◽  
pp. 191-197 ◽  
Author(s):  
R. Leyva Ramos ◽  
A. Juarez Martinez ◽  
R. M. Guerrero Coronado
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Ph Effect ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Experimental Adsorption ◽  
Ph Values ◽  
Chromium Vi ◽  
Adsorption Data

The adsorption isotherm of chromium (VI) on activated carbon was obtained in a batch adsorber. The experimental adsorption data were fitted reasonably well to the Freundlich isotherm. The effect of pH on the adsorption isotherm was investigated at pH values of 4, 6, 7, 8, 10 and 12. It was found that at pH < 6, Cr(VI) was adsorbed and reduced to Cr(III) by the catalytic action of the carbon and that at pH ≥ 12, Cr(VI) was not adsorbed on activated carbon. Maximum adsorption capacity was observed at pH 6 and the adsorption capacity was diminished about 17 times by increasing the pH from 6 to 10. The pH effect was attributed to the different complexes that Cr(VI) can form in aqueous solution. The adsorption isotherm was also affected by the temperature since the adsorption capacity was increased by raising the temperature from 25 to 40°C. It was concluded that Cr(VI) was adsorbed significantly on activated carbon at pH 6 and that the adsorption capacity was greatly dependent upon pH.

scholarly journals Sorptive removal of phenanthrene from aqueous solutions using magnetic and non-magnetic rice husk-derived biochars

2018 ◽  
Vol 5 (5) ◽  
pp. 172382 ◽  
Author(s):  
Wei Guo ◽  
Shujuan Wang ◽  
Yunkai Wang ◽  
Shaoyong Lu ◽  
Yue Gao
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Rice Husk ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Data ◽  
Magnetic Modification ◽  
Pseudo Second Order ◽  
Rice Husk Biochar

A magnetically modified rice husk biochar (MBC) was successfully prepared by a hydrothermal method from original biochar (BC) and subsequently used to remove phenanthrene (PHE) from aqueous solutions. The porosity, specific surface area and hydrophobicity of BC were significantly improved (approx. two times) after magnetic modification. The adsorption data fitted well to pseudo-second-order kinetic and Langmuir models. Compared with BC, MBC had a faster adsorption rate and higher adsorption capacity of PHE. The adsorption equilibrium for PHE on MBC was achieved within 1.0 h. The maximum adsorption capacity of PHE on MBC was 97.6 mg g −1 based on the analysis of the Sips model, which was significantly higher than that of other sources of BCs. The adsorption mechanism of the two BCs was mainly attributed to the action of surface functional groups and π–π-conjugated reactions. The adsorption of PHE on MBC mainly occurred in the functional groups of C–O and Fe 3 O 4 , but that on BC was mainly in the functional groups of –OH, N–H, C=C and C–O.

scholarly journals Adsorption Equilibrium of a Herbicide (Pendimethalin) onto Natural Clay

2005 ◽  
Vol 23 (6) ◽  
pp. 437-453 ◽  
Author(s):  
M.S. El-Geundi ◽  
T.E. Farrag ◽  
H.M. Abd El-Ghany
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Maximum Adsorption Capacity ◽  
Natural Clay ◽  
Freundlich Model ◽  
Adsorption Data ◽  
Effect Of Particle Size ◽  
System Variables ◽  
Better Than

The equilibrium adsorption of a herbicide (pendimethalin) onto natural clay from aqueous solutions was studied experimentally using different system variables. The influence of such variables, such as particle size (dp), pH and temperature, on the adsorption capacity was studied. Equilibrium modelling was carried out using the Langmuir, Freundlich and Redlich—Peterson models with the corresponding constants being calculated for the different system variables. The results indicate that the maximum adsorption capacity (qmax) at an acidic pH value (3.44) was approximately double that observed at an alkaline pH value (9.62). It was also found that the effect of particle size was significant and that the temperature plays an interesting role in the adsorption process. The enthalpy change (ΔH) for adsorption was evaluated as −29.36 kJ/mol. It is clear from the results of this study that the Freundlich model fitted the experimental adsorption data significantly better than the Langmuir or the Redlich—Peterson models.

scholarly journals Bioadsorption of lead(II) over the pulp of Acrocomia aculeata

2021 ◽  
Vol 46 (4) ◽  
pp. 38-46
Author(s):  
Alexandra Novak ◽  
F�tima Yubero ◽  
Diana Diez-P�rez-N��ez ◽  
Fernando Luis Fertonani ◽  
Brenda Gisselle Da Silva Britez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thermal Stability ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Column Experiments ◽  
Maximum Adsorption Capacity ◽  
Batch Experiments ◽  
Adsorption Data ◽  
Acrocomia Aculeata ◽  
Scanning Electron

The adsorption of lead in aqueous solution onto Acrocomia aculeata pulp was examined. The pulp was characterized in the presence and absence of lead using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG-DTA), and scanning electron microscopy (SEM). Sulfur and oxygen bonds were responsible for adsorbing lead onto the pulp surface. The TG-DTA profile proved that adding sodium azide increases the pulp�s thermal stability until 200 �C. Adsorption data in batch and column systems were analyzed to understand the pulp adsorption compared to other biomaterials. In the batch experiments, the removal efficiency reached a maximum of 91.9% when a solution of 50 ppm of lead was placed in contact with the pulp for 30 min and fit Freundlich isotherm behavior. In the column experiments, the theoretical maximum adsorption capacity was found to be 11.97 mg g�1; more column data is needed to compare column results to other studies. Further studies to improve the pulp adsorption capacity are needed for it to be a competitive biomaterial for water treatment.

Preparation and Chelating Properties of Polystyrene Modified Ethoxycarbonyl Thiourea Resin

2011 ◽  
Vol 239-242 ◽  
pp. 781-785 ◽  
Author(s):  
Shuai Wang ◽  
Hong Zhong ◽  
Liu Yin Xia ◽  
Zhong Nan Wang ◽  
Qian Zhang
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Maximum Adsorption Capacity ◽  
Polymer Grafting ◽  
Isotherm Equation ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Separation Factors ◽  
Langmuir Isotherm Equation ◽  
Freundlich Adsorption Isotherm

A novel polystyrene modified ethoxycarbonyl thiourea resin(PSETU) was synthesized by polymer grafting of aminated polystyrene and ethoxycarbonyl isothiocyanate. The adsorption capacities of PSETU follow the order: Au(III) > Cu(II) > Zn(II) > Ni(II) > Fe(III) > Ca(II) ≈ Mg(II). The adsorption capacity for Au(III) increases with the increase of contact time, temperature and initial concentration of Au(III). The adsorption data fit Boyd’s diffusion equation of liquid film, Langmuir adsorption isotherm and Freundlich adsorption isotherm. The maximum adsorption capacity of PSETU calculated by Langmuir isotherm equation is 3.485 mmol/g, and the separation factors of PSETU for Au(III)-base metal ions are above 380. According to XPS results, the functional atoms of PSETU coordinate with Au(III) during the adsorption process.

The Adsorption Isotherm Studies of Orange Peel on Pesticide Furadan

2013 ◽  
Vol 477-478 ◽  
pp. 1331-1335
Author(s):  
Guang Fu Xu ◽  
Hui Min Jing ◽  
Rui Xin Guo
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Agricultural Waste ◽  
Orange Peel ◽  
Maximum Adsorption Capacity ◽  
Attractive Candidate ◽  
Adsorption Data ◽  
Langmuir And Freundlich Models

Orange peel, an agricultural waste available in large quantity in China, was utilized as low-cost adsorbent to remove furadan from aqueous solution by adsorption. Adsorption isotherms were calculated and discussed. Both Langmuir and Freundlich models fitted the adsorption data quite reasonably (R2> 0.98) and the maximum adsorption capacity was 161.29 mg.g-1. The results in this study indicated that orange peel was an attractive candidate for removing furadan from the aqueous solution.

scholarly journals Adsorption characteristic of As(III) on goethite waste generated from hydrometallurgy of zinc

2017 ◽  
Vol 75 (12) ◽  
pp. 2747-2754 ◽  
Author(s):  
Jian-Long Hu ◽  
Xiao-Song Yang ◽  
Ting Liu ◽  
Li-Nan Shao ◽  
Wang Zhang
Keyword(s):  
Wastewater Treatment ◽  
Adsorption Capacity ◽  
Raw Material ◽  
Maximum Adsorption Capacity ◽  
Distribution Analysis ◽  
Adsorption Characteristic ◽  
Wastewater Treatment Process ◽  
Ph Values ◽  
Adsorption Data ◽  
Langmuir Isotherm Model

In this paper, goethite waste from hydrometallurgy of zinc was used as a raw material for arsenic adsorbent preparation. The goethite waste adsorbent (GWA) was characterized with scanning electron microscope (SEM), X-ray powder diffraction (XRD), and particle size distribution analysis. The adsorption of As(III) on GWA was studied as a function of contact time, pH, and coexisting anions. The safety of GWA usage in the wastewater treatment process was assessed by toxicity characteristic leaching procedure (TCLP) tests. The equilibrium adsorption data fitted well with the Langmuir isotherm model, and the maximum adsorption capacity of As(III) on GWA was 51.47 mg.g−1. GWA showed higher adsorption capacity at weak alkaline pH values (7.0–9.5). The coexisting PO43− and SiO32− presented significant adsorption competition with As(III) in aquatic systems. No significant heavy metals leaching was observed for GWA and As(III) loaded GWA in TCLP tests, which implied the safety of GWA as an adsorbent for arsenic containing wastewater treatment.

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