Phosphate Adsorption by Soils of the Tropics1

2015 ◽  
pp. 97-119 ◽  
Author(s):  
R. L. Fox ◽  
P. G. E. Searle
Keyword(s):  
Phosphate Adsorption

Application of the Southwell Plot method to determine equilibrium time in phosphate adsorption

2021 ◽  
pp. 103841
Author(s):  
Maíra Luane S. de Almeida ◽  
Adriano C.P. Lima ◽  
Koji de J. Nagahama ◽  
Tereza S.M. Santos
Keyword(s):  
Phosphate Adsorption ◽  
Equilibrium Time

Effects of Amino Acids on Phosphate Adsorption Onto Iron (Oxy)hydroxide Minerals under Early Earth Conditions

2021 ◽  
Author(s):  
Erika Flores ◽  
Eduardo Martinez ◽  
Laura E. Rodriguez ◽  
Jessica M. Weber ◽  
Arezoo Khodayari ◽  
...  
Keyword(s):  
Amino Acids ◽  
Phosphate Adsorption ◽  
Early Earth

scholarly journals Phosphorus Release and Adsorption Properties of Polyurethane–Biochar Crosslinked Material as a Filter Additive in Bioretention Systems

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 283
Author(s):  
Yike Meng ◽  
Yuan Wang ◽  
Chuanyue Wang
Keyword(s):  
Removal Rate ◽  
Phosphorus Release ◽  
Phosphate Adsorption ◽  
Stormwater Treatment ◽  
Isothermal Adsorption ◽  
Phosphorus Pollution ◽  
Adsorption Capacities ◽  
Saturated Water Content ◽  
Phosphate Treatment ◽  
Potential Use

Bioretention systems are frequently employed in stormwater treatment to reduce phosphorus pollution and prevent eutrophication. To enhance their efficiency, filter additives are required but the currently used traditional materials cannot meet the primary requirements of excellent hydraulic properties as well as outstanding release and adsorption capacities at the same time. In this research, a polyurethane-biochar crosslinked material was produced by mixing the hardwood biochar (HB) with polyurethane to improve the performance of traditional filter additives. Through basic parameter tests, the saturated water content of polyurethane-biochar crosslinked material (PCB) was doubled and the permeability coefficient of PCB increased by two orders of magnitude. Due to the polyurethane, the leaching speed of phosphorus slowed down in the batching experiments and fewer metal cations leached. Moreover, PCB could adsorb 93–206 mg/kg PO43− at a typical PO43− concentration in stormwater runoff, 1.32–1.58 times more than HB, during isothermal adsorption experiments. In the simulating column experiments, weaker hydropower reduced the PO43− leaching quantities of PCB and had a stable removal rate of 93.84% in phosphate treatment. This study demonstrates the potential use of PCB as a filter additive in a bioretention system to achieve hydraulic goals and improve phosphate adsorption capacities.

scholarly journals Enhancement of phosphate adsorption by chemically modified biochars derived from Mimosa pigra invasive plant

2021 ◽  
pp. 100117
Author(s):  
Thi Cuc Phuong Tran ◽  
Thi Phuong Nguyen ◽  
Thi Thao Nguyen Nguyen ◽  
Thi Nhu Thao Tran ◽  
Thi An Hang Nguyen ◽  
...  
Keyword(s):  
Invasive Plant ◽  
Phosphate Adsorption ◽  
Chemically Modified ◽  
Mimosa Pigra

scholarly journals Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1312
Author(s):  
Dereje Tadesse Mekonnen ◽  
Esayas Alemayehu ◽  
Bernd Lennartz
Keyword(s):  
Aqueous Solutions ◽  
Low Income ◽  
Low Cost ◽  
Volcanic Rocks ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Adsorptive Capacity ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorptive Removal

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

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