scholarly journals THE EFFECT OF PHOSPHATE CONCENTRATION AND MIXING TIME TO PHOSPHATE ADSORPTION BY DIFFUSIVE GRADIENT IN THIN-FILM (DGT) BASED IRON METALORGANIC FRAMEWORK (FE-MOF) AS A BINDING AGENT

2021 ◽  
Vol 14 (03) ◽  
pp. 1724-1728
Author(s):  
A. Saefumillah ◽  
A. Zulys ◽  
V. Sintya
Keyword(s):  
Thin Film ◽  
Mixing Time ◽  
Phosphate Concentration ◽  
Phosphate Adsorption ◽  
Binding Agent ◽  
Metalorganic Framework

scholarly journals The Study of Phosphate Release from Artificial Sediment into Water Body Using Diffusive Gradient in Thin Film (DGT) Device in Oxic Condition

2020 ◽  
Vol 20 (2) ◽  
pp. 395
Author(s):  
Ardina Purnama Tirta ◽  
Asep Saefumillah ◽  
Foliatini Foliatini ◽  
Herawati Herawati
Keyword(s):  
Thin Film ◽  
Phosphate Concentration ◽  
Water Bodies ◽  
Biogeochemical Processes ◽  
Oxic Condition ◽  
Phosphate Release ◽  
Artificial Sediment ◽  
Sediment Samples ◽  
Sediment Sampling ◽  
Phosphate Analysis

The phenomenon of phosphate release in sediments into water bodies under oxic environment has been investigated using the Diffusive Gradient in Thin Film (DGT) technique. This research consists of several stages: polymer synthesis and DGT probe assembly, sediment sampling, DGT deployment in oxic conditions, and phosphate analysis from DGT adsorption results. Acrylamide polymer was successfully synthesized with a composition 15% acrylamide; N-N'-methylenebisacrylamide 0.1% and ferrihydrite as binding gels. DGT probes were assembly by placing a 16 x 3.2 cm polyacrylamide gel, binding gels and filter membranes on the DGT probes. The sediment sample was taken from the Bogor Botanical Gardens at the coordinates 6°36’00.6” S; 106°47’51.0” E. The DGT probe was placed in sediment samples for 1, 3 and 7 days in oxic conditions. After the prescribed time, the binding gel was removed and cut every 1 cm depth, then eluted using 0.25 M H2SO4 and the phosphate concentration was measured using spectrophotometry method. The results showed that the phosphate concentration tends to be higher with the increasing incubation time and depth. Maximum CDGT phosphate released on day 1, day 3 and day 7 were 1.00 µg/L at a depth of 14 cm, 6.61 µg/L at a depth of 14 cm, and 20.92 µg/L at a depth of 11 cm respectively. This ensures that the phosphate in water bodies comes from biogeochemical processes that occur in sediments and is successfully measured through DGT techniques.

The Absorption of Phosphate by Estuarine Bottom Deposits

1959 ◽  
Vol 10 (1) ◽  
pp. 7 ◽  
Author(s):  
HR Jitts
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Isotope Dilution ◽  
Phosphate Concentration ◽  
Phosphate Adsorption ◽  
Bottom Deposits ◽  
Run Off ◽  
Effects Of Ph

Experiments were made on the effects of pH, phosphate concentration, particle size, iron, and organic matter on the adsorption of phosphate by estuarine bottom deposits in as natural a state as possible. Measurements of the ability of the silt to adsorb phosphate were made by isotope dilution, using 32P. The silt was separated into four fractions by sedimentation. The ability of silts to adsorb phosphate was directly related to the ratio of their contents of iron to organic matter. Organic matter depressed phosphate adsorption. Suspensions of silts (2.99g/1250ml) adsorbed 80-90 per cent. of the phosphate in solutions containing 0.55 to 2.55 mg of phosphate P. This suggested that adsorption caused estuarine silts to trap phosphates during run-off periods.

scholarly journals Remoción de fosfato de ambientes acuáticos utilizando nanopartículas modificadas de Fe-Co/Quitosan

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Tadeh Issaian ◽  
Julia Costanza Relles Cuellar
Keyword(s):  
River Water ◽  
Aquatic Ecosystems ◽  
Environmentally Friendly ◽  
Cobalt Nanoparticles ◽  
Phosphate Concentration ◽  
Adsorption Rate ◽  
Synthetic Wastewater ◽  
Phosphate Adsorption ◽  
Jordan River ◽  
Iron Cobalt

Chitosan modified iron-cobalt nanoparticles (CMNPs) were used for phosphate adsorption in synthetic wastewater and river water from the Jordan river in Tunja, Boyacá, Colombia. Phosphate adsorption by CMNPs reached 52.7% in synthetic wastewater and 58.7% in water taken from the Jordan river. This indicates that the CMNPs ability to adsorb phosphates is independent of other components in river water. Additionally, adsorption measurements were taken using the average pH, temperature, and phosphate concentration of the river water in order to ensure results comparable to those of (Kim 2017). A maximum adsorption rate of 0.138mg of phosphate per gram of adsorbent was found with the majority of adsorption taking place within the first 15 minutes of contact with the adsorbent. The adsorption of phosphates using CMNPs presents an effective and environmentally friendly solution to reducing phosphates in aquatic ecosystems without altering the characteristics of river water.

La2O3-modified MCM-41 for efficient phosphate removal synthesized using natural diatomite as precursor

2019 ◽  
Vol 79 (10) ◽  
pp. 1878-1886 ◽  
Author(s):  
Xiaoning Jia ◽  
Xiaojuan He ◽  
Kaixuan Han ◽  
Yuhong Ba ◽  
Xia Zhao ◽  
...  
Keyword(s):  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Treated Wastewater ◽  
Molar Ratio ◽  
Phosphate Adsorption ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Isothermal Model ◽  
Enhanced Adsorption ◽  
Ph Range

Abstract In this study, an ordered mesoporous silica modified with lanthanum oxide was synthesized using diatomite as silica source and applied for adsorption of phosphate from aqueous solution. By taking cost-effectiveness for practical application into consideration, the adsorbent with a theoretical La/SiO2 molar ratio of 0.2 (La0.2M41) possessed a promising performance. In the batch adsorption tests, the adsorbents with La2O3 loading possessed markedly enhanced adsorption capacities. Phosphate uptake by La0.2M41 was pH-dependent with the highest sorption capacities observed over a pH range of 3.0–6.0. Coexistent anions displayed an adverse effect on phosphate adsorption following the order of CO32−  > F−  > NO3− > Cl− > SO42−. In the kinetic study, phosphate adsorption onto La0.2M41 followed the pseudo-second-order equation better than the pseudo-first-order, suggesting chemisorption. The Langmuir isothermal model well described the adsorption isotherm data, showing a maximum adsorption capacity for phosphate of up to 263.16 mg/g at 298 K. In a real treated wastewater effluent with phosphate concentration of 2.5 mg P/L, La0.2M41 efficiently reduced the phosphate concentration to 28 µg P/L.

One-Pot Synthesis of Mesoporous MCM-41 with Different Functionalization Levels and their Adsorption Abilities to Phosphate

2012 ◽  
Vol 476-478 ◽  
pp. 1969-1973 ◽  
Author(s):  
Wei Ya Huang ◽  
Jun Yang ◽  
Yuan Ming Zhang
Keyword(s):  
Removal Rate ◽  
Langmuir Model ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Experiment Data ◽  
Sorption Equilibrium ◽  
One Pot ◽  
Adsorption Capacities ◽  
Mcm 41

Ethylenediamine (EDA) functionalized mesoporous MCM-41 particles displaying various functionalization levels have been prepared by one-pot method. The prepared samples were treated with Fe(III) to form cationic complexes inside MCM-41 pores (MCM-41-NN-Fe-x%, x=10, 20 and 30) for trapping phosphate from water. The prepared adsorbents were characterized by XRD, BET, TGA and elemental analysis, and their phosphate adsorption performances were studied. The results showed that the phosphate removal rate of all the prepared adsorbents were higher than 95% at the initial phosphate concentration of 2 ppm. Additionally, the Langmuir model was used to simulate the sorption equilibrium, and the results indicated that the experiment data agreed well with the Langmuir model. The maximum adsorption capacities calculated from the Langmuir model increased with the increase of diamino loadings in adsorbents, and the maximum adsorption capacities of MCM-41-NN-Fe-30% was 52.5 mg/g.

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