Phosphorus Intensity-Quantity Relationships in Soils Highly Contrasting in Phosphorus Adsorption Properties

2004 ◽  
Vol 35 (1-2) ◽  
pp. 131-143 ◽  
Author(s):  
Roberto Indiati ◽  
Paolo Sequi
Keyword(s):  
Adsorption Properties ◽  
Phosphorus Adsorption

Thermodynamic Properties of Modified Sepiolite Phosphorus Removal

2013 ◽  
Vol 726-731 ◽  
pp. 234-238
Author(s):  
Wen Quan
Keyword(s):  
Experimental Data ◽  
Thermodynamic Properties ◽  
Adsorption Capacity ◽  
Phosphorus Removal ◽  
Theoretical Foundation ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Phosphorus Adsorption ◽  
Depth Study ◽  
Adsorption Amount

this thesis makes an in-depth study on the adsorption properties of modified sepiolite to phosphorus, and confirms how the factors such as, phosphorus wastewater flow, phosphorus removal agent dosage, temperature, additives and other factors effect on the phosphorus adsorption thermodynamic equilibrium of modified sepiolite. With the increase of phosphorus removal agent of modified sepiolite, adsorption capacity of modified sepiolite phosphorus removal to PO43- ions in wastewater decreases; the removal rate increases with the increase removal agent; improving the acid modified temperature favors the adsorption of compound phosphorus removal to sepiolite; adsorption amount increases with the calcination temperature of sepiolite. This thesis describes the adsorption capacity of the modified sepiolite to phosphorus changes with temperature. According to the experimental data, adsorption isotherms at different temperature are presented in this thesis. And a theoretical foundation is provided for the industrial application of modified sepiolite phosphorus removal.

scholarly journals Phosphorus adsorption/desorption kinetics of bioretention

2020 ◽  
Vol 24 (4) ◽  
pp. 2401-2410
Author(s):  
Ying Mei ◽  
Xiao-Han Zhu ◽  
Long Gao ◽  
Hang Zhou ◽  
Ya-Jun Xiang ◽  
...  
Keyword(s):  
Iron Powder ◽  
Aluminum Powder ◽  
Adsorption Properties ◽  
Desorption Kinetics ◽  
Considerable Influence ◽  
Phosphorus Adsorption ◽  
Monolayer Adsorption ◽  
Effects Of Ph ◽  
Adsorption Desorption ◽  
Kinetics Of

A bioretention medium has considerable influence on the removal of pollutants, especially phosphorus pollutants. In this paper, the phosphorus adsorption properties of three bioretention media (sand, iron powder, and aluminum powder) are studied, and the effects of pH and ionic strength on the phosphorus adsorption are analyzed. Results show that the phosphorus adsorption isotherm can be well modeled by the Langmuir equation. The experimental results show the monolayer adsorption capacity of sand is the highest, while the iron powder the lowest. The pH of the solution has a considerable influence on the phosphorus adsorption of sand and iron powder, but has a minimal effect on aluminum powder.

Effect of gas-dynamic phenomena on adsorption properties of coal in Krasnolimanskaya Mine

2018 ◽  
Vol 11 ◽  
pp. 46-55
Author(s):  
E.V. Ulyanova ◽  
◽  
V.A. Vasilkovskiy ◽  
O.N. Malinnikova ◽  
◽  
...  
Keyword(s):  
Adsorption Properties ◽  
Gas Dynamic ◽  
Dynamic Phenomena

QM/MM Simulations of Organic Phosphorus Adsorption at the Diaspore-Water Interface

2019 ◽  
Author(s):  
Prasanth Babu Ganta ◽  
Oliver Kühn ◽  
Ashour Ahmed
Keyword(s):  
Interaction Energy ◽  
Dynamics Simulation ◽  
Water Molecules ◽  
Hydroxyl Groups ◽  
Water Interface ◽  
Mineral Surfaces ◽  
Soil Mineral ◽  
Phosphorus Adsorption ◽  
Covalent Bonds ◽  
Binding Mechanisms

The phosphorus (P) immobilization and thus its availability for plants are mainly affected by the strong interaction of phosphates with soil components especially soil mineral surfaces. Related reactions have been studied extensively via sorption experiments especially by carrying out adsorption of ortho-phosphate onto Fe-oxide surfaces. But a molecular-level understanding for the P-binding mechanisms at the mineral-water interface is still lacking, especially for forest eco-systems. Therefore, the current contribution provides an investigation of the molecular binding mechanisms for two abundant phosphates in forest soils, inositol hexaphosphate (IHP) and glycerolphosphate (GP), at the diaspore mineral surface. Here a hybrid electrostatic embedding quantum mechanics/molecular mechanics (QM/MM) based molecular dynamics simulation has been applied to explore the diaspore-IHP/GP-water interactions. The results provide evidence for the formation of different P-diaspore binding motifs involving monodentate (M) and bidentate (B) for GP and two (2M) as well as three (3M) monodentate for IHP. The interaction energy results indicated the abundance of the GP B motif compared to the M one. The IHP 3M motif has a higher total interaction energy compared to its 2M motif, but exhibits a lower interaction energy per bond. Compared to GP, IHP exhibited stronger interaction with the surface as well as with water. Water was found to play an important role in controlling these diaspore-IHP/GP-water interactions. The interfacial water molecules form moderately strong H-bonds (HBs) with GP and IHP as well as with the diaspore surface. For all the diaspore-IHP/GP-water complexes, the interaction of water with diaspore exceeds that with the studied phosphates. Furthermore, some water molecules form covalent bonds with diaspore Al atoms while others dissociate at the surface to protons and hydroxyl groups leading to proton transfer processes. Finally, the current results confirm previous experimental conclusions indicating the importance of the number of phosphate groups, HBs, and proton transfers in controlling the P-binding at soil mineral surfaces.

Preparation of Magnetic Nanomaterials and Its Adsorption Properties Towards Cr2O2-7

2013 ◽  
Vol 30 (8) ◽  
pp. 927
Author(s):  
Li ZHANG ◽  
Jian ZHANG ◽  
Zulei ZHANG ◽  
Haiqing LIU ◽  
Lei LI
Keyword(s):  
Adsorption Properties ◽  
Magnetic Nanomaterials
Sign in / Sign up

Export Citation Format

Share Document