Phosphate Adsorption‐Desorption Characteristics of Suspended Sediments in the Maumee River Basin of Ohio

1978 ◽  
Vol 7 (2) ◽  
pp. 208-212 ◽  
Author(s):  
Dan B. Green ◽  
Terry J. Logan ◽  
Neil E. Smeck
Keyword(s):  
River Basin ◽  
Suspended Sediments ◽  
Phosphate Adsorption ◽  
Adsorption Desorption

Application of raw and modified Uruguayan clays to phosphate adsorption for water remediation

MRS Advances ◽  
2018 ◽  
Vol 3 (61) ◽  
pp. 3543-3549
Author(s):  
Pablo González ◽  
Andrea C. De Los Santos ◽  
Jorge R. Castiglioni ◽  
María A. De León
Keyword(s):  
Nitrogen Adsorption ◽  
Pillared Clay ◽  
Water Remediation ◽  
Phosphate Adsorption ◽  
X Ray Diffraction ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
First Order ◽  
Adsorption Desorption

ABSTRACTA raw clay from Uruguay was modified with aluminium to obtain an aluminium pillared clay (Al-PILC). The solids were characterized by scanning electron microscopy, X-ray diffraction and nitrogen adsorption-desorption isotherms. The Al-PILC retained the typical laminar structure of montmorillonite. The specific surface area and the microporous volume of the Al-PILC, 235 m2 g-1 and 0.096 cm3 g-1, respectively, were much higher than those of the clay. The phosphate adsorption capacity of the Al-PILC was higher than those of the clay. The phosphate adsorption kinetic followed the pseudo-first-order model for both, the clay and the Al-PILC, and the phosphate adsorption isotherm for the Al-PILC fit the Freundlich model.

Phosphate Adsorption/desorption in Seven Soil Series of Pakistan

1999 ◽  
Vol 2 (3) ◽  
pp. 897-899
Author(s):  
Nisar Ahmad . ◽  
Abdul Razzaq . ◽  
Muhammad Yaseen .
Keyword(s):  
Phosphate Adsorption ◽  
Soil Series ◽  
Adsorption Desorption

Impact of DOM in Reclaimed Water on Nitrogen/Phosphate Adsorption in Sediments

2013 ◽  
Vol 395-396 ◽  
pp. 678-685 ◽  
Author(s):  
Chun Fa Zhou ◽  
Zi Gong Ning ◽  
Wei Zhao ◽  
Yun Kai Li ◽  
Ming Chao Liang ◽  
...  
Keyword(s):  
Confidence Level ◽  
Reclaimed Water ◽  
Phosphate Adsorption ◽  
Urban Rivers ◽  
Adsorption Coefficient ◽  
Adsorption Dynamic ◽  
Rivers And Lakes ◽  
Adsorption Of Nitrogen ◽  
Adsorption Desorption ◽  
The Impact

The nitrogen and phosphate were regarded as the target pollutants in this paper to study the balance of adsorption / desorption to nitrogen and phosphate, the adsorption dynamic characteristics under the action of four kinds of urban rivers and lakes sediments in Beijing as well as the impact of DOM in reclaimed water to absorb nitrogen and phosphate. Results show that: the processes of sorption of nitrogen and phosphate in the four sediments could be described by the Linear and Freundlich models, while the adsorption-desorption goes with hysteresis effect. The adsorption of nitrogen and phosphate were inhibited by DOM in reclaimed water, with an adsorption coefficient Kddecreasing by 0.04% -56.88%, reaching a significant level (confidence level α = 0.05);And DOM increased the nonlinear parameter 1/n, up to 2.20 times at most, resulting in a lower adsorption stable.

scholarly journals Phosphate Adsorption Capacity and Organic Matter Effect on Dynamics of P Availability in Upland Ultisol and Lowland Inceptisol

2013 ◽  
Vol 16 (2) ◽  
pp. 107-114
Author(s):  
. Marsi ◽  
. Sabaruddin
Keyword(s):  
Organic Matter ◽  
Fresh Water ◽  
Water Soluble ◽  
Available P ◽  
Phosphate Adsorption ◽  
P Availability ◽  
Soil P ◽  
Soil Available P ◽  
Adsorption Desorption ◽  
Desorption Capacity

Ultisols and Inceptisols were used to investigate the adsorption-desorption capacity of P and the effect of organic matter on the dynamics of P availability in tropical acid soils. The experiment consisted of two sub-experiments. Sub-experiment I was to study the adsorption-desorption capacity of Ultisols, Fresh-water lowland Inceptisols, and tidal-swamp Inceptisols. Therefore, surface soils (0 to 30 cm) of each tested soil were treated with 0, 10, 20, 30, 40, 60, 80, 100, 120, 140, 170, and 200 mg P kg-1 of soil. Sub-experiment II was to study the effects of organic matterapplication (0, 5, 10, and 15 Mg ha-1) on the dynamics of available P following 60d incubation under room temperature.P fertilizer application significantly affected water soluble-P (WSP) (p<0.01) and soil available P-Bray and Kurtz No. 1 (BKP) (p<0.01) in the three tested soils. The different response of both WSP and BKP confirmed that the soils tested in the current experiment had different soil P buffering capacity in the order of Tidal-lowlandInceptisol>Upland Ultisol>fresh-water Lowland Inceptisol. OM application increased the BKP in all tested soils as compared to the control. Differences in pattern of soil available P dynamics over time were detected between upland soil and two lowland soils used in the current experiment.Keywords: Adsorption-desorption, Inceptisols, organic matter, Ultisols

scholarly journals Análise Montante-Jusante da Granulometria dos Sedimentos de Fundo e Suspenso do Rio Negro e Tributários (Bacia Amazônica, Brasil)

2021 ◽  
Vol 14 (2) ◽  
pp. 997
Author(s):  
Rogério Ribeiro Marinho ◽  
Antonio Fábio Sabbá Guimarães Vieira ◽  
Feliciano De Souza Maciel
Keyword(s):  
Sediment Transport ◽  
River Basin ◽  
Amazon Basin ◽  
Suspended Sediments ◽  
Fine Sand ◽  
Large River ◽  
Coarse Sand ◽  
Sediment Size ◽  
Negro River ◽  
Rio Negro

O conhecimento das características físicas de sedimentos transportados por grandes sistemas fluviais possui significativa importância para o entendimento de processos geomorfológicos e hidrológicos. O nível de conhecimento dos grandes sistemas fluviais da Amazônia e sua relação com o transporte de sedimentos ainda é limitado, resultando em lacunas de conhecimento sobre a dinâmica da paisagem nesta complexa região. Este trabalho teve como objetivo avaliar a distribuição espacial da granulometria de sedimentos de fundo e suspenso do Rio Negro e tributários. Realizou-se análise da distribuição do tamanho dos sedimentos em seções amostrais localizadas no alto, médio e baixo curso do Rio Negro. Os resultados da análise granulométrica da carga de fundo indicam a predominância de sedimentos com tamanho variando de 0,25 a 1,0 mm (principalmente areia fina, areia média e areia grossa) enquanto no baixo curso as amostram oscilaram de areia fina a partículas lamosas (< 0,50 mm). No Rio Negro os sedimentos suspensos são compostos principalmente de partículas finas de silte (90% menor que 80 µm) com diâmetro mediano (D50) de 25 µm. As características granulométricas apresentadas neste trabalho fornecem subsídios para o entendimento de processos hidrodinâmicos de transporte e deposição dos sedimentos de fundo e suspenso neste gigante sistema fluvial.    Upstream-downstream Granulometry Analysis of bed and suspended sediments in the Negro River Basin (Amazon Basin, Brazil)A B S T R A C TThe knowledge of the physical characteristics of sediments transported by large river systems has significant importance for the understanding of geomorphological and hydrological processes. The level of knowledge of the large rivers of the Amazon basin and their relationship with sediment transport is limited, resulting in gaps about the dynamics of the landscape in this complex region. This article analyzes the spatial distribution of granulometry of bed and suspended sediments in the Negro River and tributaries. An analysis of the sediment size distribution was carried out in sample sections located in the upper, middle and lower reaches of the Negro River. The results of the granulometric analysis of the bed load indicate the predominance of sediments with sizes ranging from 0.25 to 1.0 mm (mainly fine sand, medium sand and coarse sand) while in the low course they showed oscillated from fine sand to muddy particles (<0.50 mm). In the Negro River basin the suspended sediments are composed mainly of fine silt particles (90% less than 80 µm) with a median diameter (D50) of 25 µm. The granulometric characteristics presented in this work provide subsidies for the understanding of hydrodynamic processes of transport and deposition of bed and suspended sediments in this huge fluvial system.Keywords: sediment transport, Amazon floodplain, multichannel river, anabranching

scholarly journals ADSORPTION-DESORPTION OF TRACE ELEMENTS IN SEDIMENTS OF THE MAIPO RIVER BASIN

2020 ◽  
Vol 65 (2) ◽  
pp. 4778-4783
Author(s):  
Sylvia V. Copaja ◽  
Lidia Mauro ◽  
Caren Vega-Retter ◽  
David Véliz
Keyword(s):  
Trace Elements ◽  
River Basin ◽  
Adsorption Desorption

scholarly journals Adsorption of phosphate ions from aqueous solutions by a CeO2 functionalized Fe3O4@SiO2 core-shell magnetic nanomaterial

2017 ◽  
Vol 76 (11) ◽  
pp. 2867-2875 ◽  
Author(s):  
Jingliang Liu ◽  
Jingjing Cao ◽  
Yaojuan Hu ◽  
Yuxiang Han ◽  
Juan Zhou
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bet Surface Area ◽  
Phosphate Adsorption ◽  
Batch Adsorption ◽  
Core Shell ◽  
X Ray ◽  
Transmission Electron ◽  
Adsorption Affinity ◽  
Magnetic Nanomaterial ◽  
Adsorption Desorption

Abstract Phosphate is generally considered to be one of the nutrients for plants which may cause eutrophication of the aquatic environment. In this study, a CeO2-functionalized Fe3O4@SiO2 core-shell magnetic nanomaterial (denoted as Fe3O4@SiO2-CeO2) was prepared and used as the adsorbent to remove phosphate from water. The adsorbents were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and N2 adsorption/desorption isotherms. Characterization results show that the particle size is around 8.63 nm, Brunauer–Emmett–Teller (BET) surface area is 179.7 m2 · g−1 and the pore volume is 0.39 cm3 · g−1 for magnetite Fe3O4@SiO2-CeO2. The adsorbents could be rapidly separated under an external magnetic field. Batch adsorption tests show that the Fe3O4@SiO2-CeO2 adsorbent exhibited high adsorption affinity for phosphate. Additionally, phosphate adsorption isotherms over the adsorbents could be well described by the Langmuir model, suggesting monolayer adsorption, and phosphate adsorption kinetics followed the pseudo-second-order kinetics. Moreover, increasing pH led to suppressed phosphate adsorption, and phosphate adsorption slightly increased with ionic strength.

scholarly journals Phosphorus sorption and buffering mechanisms in suspended sediments from the Yangtze Estuary and Hangzhou Bay, China

2013 ◽  
Vol 10 (5) ◽  
pp. 3341-3348 ◽  
Author(s):  
M. Li ◽  
M. J. Whelan ◽  
G. Q. Wang ◽  
S. M. White
Keyword(s):  
Fine Particle ◽  
Suspended Sediments ◽  
Yangtze Estuary ◽  
Buffering Capacity ◽  
Phosphate Adsorption ◽  
Hangzhou Bay ◽  
Phosphorus Sorption ◽  
The Yangtze Estuary ◽  
Different Temperatures ◽  
Increasing Temperature

Abstract. The adsorption isotherm and the mechanism of the buffering effect are important controls on phosphorus (P) behaviors in estuaries and are important for estimating phosphate concentrations in aquatic environments. In this paper, we derive phosphate adsorption isotherms in order to investigate sediment adsorption and buffering capacity for phosphorus discharged from sewage outfalls in the Yangtze Estuary and Hangzhou Bay near Shanghai, China. Experiments were also carried out at different temperatures in order to explore the buffering effects for phosphate. The results show that P sorption in sediments with low fine particle fractions was best described using exponential equations. Some P interactions between water and sediment may be caused by the precipitation of CaHPO4 from Ca2&amp;plus; and HPO42− when the phosphate concentration in the liquid phase is high. Results from the buffering experiments suggest that the Zero Equilibrium Phosphate Concentrations (EPC0) vary from 0.014 mg L−1 to 0.061 mg L−1, which are consistent with measured phosphate concentrations in water samples collected at the same time as sediment sampling. Values of EPC0 and linear sorption coefficients (K) in sediments with high fine particle and organic matter contents are relatively high, which implies that they have high buffering capacity. Both EPC0 and K increase with increasing temperature, indicating a higher P buffering capacity at high temperatures.

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