scholarly journals Efficient capture of phosphate from aqueous solution using acid activated akadama clay and mechanisms analysis

2018 ◽  
Vol 78 (7) ◽  
pp. 1603-1614 ◽  
Author(s):  
Ying Wang ◽  
Hui He ◽  
Nan Zhang ◽  
Kazuya Shimizu ◽  
Zhongfang Lei ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ph Effect ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Order Kinetic ◽  
Negative Effects ◽  
Initial Ph ◽  
Intra Particle Diffusion ◽  
Langmuir Isotherm Model ◽  
Ph Range

Abstract In this study, akadama clay, a kind of volcano ash, was activated with sulfuric acid and then evaluated for the adsorption of phosphate from aqueous solution via batch experiments. The effects of adsorbent dose, initial pH and coexisting anions on phosphate removal by natural akadama clay and acid-activated akadama clay were investigated. Based on the pH effect, the modified adsorbent could efficiently capture phosphate over a wider pH range of 3.00–6.00 than natural akadama clay. Competitive anions showed negative effects on the phosphate adsorption, especially citrate and carbonate. The adsorption process followed the pseudo-second-order kinetic equation and the intra-particle diffusion. Langmuir isotherm model was found to fit the data better than Freundlich model, and the maximum adsorption capacities of phosphate onto the natural akadama clay and acid-activated akadama clay were 5.88 and 9.19 mg/g, respectively. Furthermore, thermodynamic studies confirmed that the adsorption of acid-activated akadama clay was a spontaneous process. The mechanisms of phosphate adsorption on the clay could be ascribed to electrostatic attraction and ligand exchange. These results suggest that after modification, acid-activated akadama clay could be used as a promising adsorbent for phosphate removal from wastewater in real application and then further used as fertilizers.

Study on an effective industrial waste-based adsorbent for the adsorptive removal of phosphorus from wastewater: equilibrium and kinetics studies

2016 ◽  
Vol 73 (8) ◽  
pp. 1891-1900 ◽  
Author(s):  
Ruzhen Xie ◽  
Yao Chen ◽  
Ting Cheng ◽  
Yuguo Lai ◽  
Wenju Jiang ◽  
...  
Keyword(s):  
Industrial Waste ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Order Kinetic ◽  
Solution Ph ◽  
Before And After ◽  
Equilibrium And Kinetics ◽  
Equilibrium Data ◽  
Intra Particle Diffusion ◽  
Ph Range

In this work, an effective adsorbent for removing phosphate from aqueous solution was developed from modifying industrial waste — lithium silica fume (LSF). The characterization of LSF before and after modification was investigated using an N2 adsorption–desorption technique (Brunauer–Emmett–Teller, BET), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Studies were conducted to investigate the effect of adsorbent dose, initial solution pH, contact time, phosphate concentration, and temperature on phosphate removal using this novel adsorbent. The specific surface area for modified LSF (LLSF) is 24.4024 m2/g, improved 69.8% compared with unmodified LSF. XRD result suggests that the lanthanum phosphate complex was formed on the surface of LLSF. The maximum phosphate adsorption capacity was 24.096 mg P/g for LLSF, and phosphate removal was favored in the pH range of 3–8. The kinetic data fitted pseudo-second-order kinetic equation, intra-particle diffusion was not the only rate controlling step. The adsorption isotherm results illustrated that the Langmuir model provided the best fit for the equilibrium data. The change in free energy (△G0), enthalpy (△H0) and entropy (△S0) revealed that the adsorption of phosphate on LLSF was spontaneous and endothermic. It was concluded that by modifying with lanthanum, LSF can be turned to be a highly efficient adsorbent in phosphate removal.

Studies on Phosphate Removal from Aqueous Solution by Honeycomb-Cinder Slag

2012 ◽  
Vol 217-219 ◽  
pp. 862-865
Author(s):  
Li Jun Wang ◽  
Hua Yong Zhang ◽  
Lu Yi Zhang
Keyword(s):  
Aqueous Solution ◽  
Phosphate Removal ◽  
Solution Temperature ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Solution Ph ◽  
Initial Ph ◽  
Desorption Study ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

The feasibility of using honeycomb-cinder slag as an adsorbent for phosphate removal from aqueous solution was investigated in batch experiments as a function of initial pH, contact time, adsorbent dose, and solution temperature. The results indicated that the solution pH significantly influenced the phosphate adsorption; 1440 min was enough to reach equilibrium for any concentration. Langmuir isotherm model gave well fit for phosphate adsorption, and the adsorption process followed pseudo second-order model. Desorption study exhibited that the phosphate adsorption on the honeycomb-cinder slag is not completely reversible. Results showed that honeycomb-cinder slag could be used as an adsorbent to uptake phosphate from wastewater.

Pyridinium-functionalized magnetic mesoporous silica nanoparticles as a reusable adsorbent for phosphate removal from aqueous solution

2016 ◽  
Vol 74 (5) ◽  
pp. 1127-1135 ◽  
Author(s):  
Fang Ma ◽  
Hongtao Du ◽  
Ronghua Li ◽  
Zengqiang Zhang
Keyword(s):  
Aqueous Solution ◽  
Silica Nanoparticles ◽  
Adsorption Capacity ◽  
Mesoporous Silica Nanoparticles ◽  
Phosphate Removal ◽  
Maximum Adsorption Capacity ◽  
Intra Particle Diffusion ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Magnetic Mesoporous Silica

In this work, pyridinium-functionalized silica nanoparticles adsorbent (PC/SiO2/Fe3O4) was synthesized for phosphate removal from aqueous solutions. The removal efficiency of phosphate on the PC/SiO2/Fe3O4 was carried out and investigated under various conditions such as pH, contact temperature and initial concentration. The results showed that the adsorption equilibrium could be reached within 10 min, which fitted a Langmuir isotherm model, with maximum adsorption capacity of 94.16 mg/g, and the kinetic data were fitted well by pseudo-second-order and intra-particle diffusion models. Phosphate loaded on the adsorbents could be easily desorbed with 0.2 mol/L of NaOH, and the adsorbents showed good reusability. The adsorption capacity was still around 50 mg/g after 10 times of reuse. All the results demonstrated that this pyridinium-functionalized mesoporous material could be used for the phosphate removal from aqueous solution and it was easy to collect due to its magnetic properties.

Kinetic studies of phosphate adsorption onto construction solid waste (CSW)

2014 ◽  
Vol 49 (4) ◽  
pp. 307-318 ◽  
Author(s):  
C. Liu ◽  
Y. Yang ◽  
N. Wan
Keyword(s):  
Solid Waste ◽  
Low Cost ◽  
Kinetic Studies ◽  
Second Order ◽  
Phosphate Removal ◽  
Alkaline Condition ◽  
Phosphate Adsorption ◽  
Particle Diffusion ◽  
Order Kinetic ◽  
Intra Particle Diffusion

Adsorption of phosphate onto construction solid waste (CSW) was investigated in a batch system. CSW as an inescapable by-product of the construction and demolition process, was used as a composite adsorbent for the removal of phosphate in this study. The adsorption kinetics was investigated under various parameters such as contact time, pH, CSW dosage, initial phosphate concentration and particle size. Greater percentage of phosphate was removed with decrease in the initial concentration and increase in the amount of CSW used. Adsorption of phosphate was pH dependent, and maximum phosphate immobilisation capacity was obtained in alkaline condition. Lagergren first-order, second-order, intra-particle diffusion and external diffusion model were used to test the experimental data. Kinetic analysis showed that the adsorption was best fitted with the pseudo-second-order kinetic model. Adsorption mechanism studies revealed that both external mass transfer and intra-particle diffusion had rate limiting effects on the removal process. These results demonstrated that the CSW could be used as a low-cost adsorbent media for phosphate removal, and the data were relevant for optimal design of wastewater treatment plants.

scholarly journals Effect of Hydrogen Ion Presence in Adsorbent and Solution to Enhance Phosphate Adsorption

2021 ◽  
Vol 11 (6) ◽  
pp. 2777
Author(s):  
Taehoon Kim ◽  
Byungryul An
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Mechanism ◽  
Ph Effect ◽  
Total Surface Area ◽  
Point Of Zero Charge ◽  
Phosphate Adsorption ◽  
Hydrogen Ions ◽  
Solution Ph ◽  
Initial Ph ◽  
Ph Range

In this paper, the effect of hydrogen ions on the adsorption onto granular activated carbon (GAC) with the inorganic contaminant phosphate, which exists as a form of four species depending on the solution pH, is investigated. Various batch isotherm and kinetic experiments were conducted in an initial pH 4 as an acid, a pH 7 as neutral, and a pH 9 solution as a base for the GAC conditioned with deionized water and hydrochloric acid, referred to as GAC and GACA, respectively. The physical properties, such as the total surface area, pore volume, pore size distribution, and weight of the element, obtained from Brunauer–Emmett–Teller (BET) and scanning electron microscopy coupled with energy-dispersive X-ray spectrometry (SEM–EDX) represent no significant differences. However, the hydrochloric acid (HCl) condition results in an alteration of the pH of the point of zero charge from 4.5 to 6.0. The optimized initial pH was determined as being acid for the GAC and as being neutral for the GACA. According to the Langmuir isotherm, the relatively high Qm was obtained as being acid for the GAC and clearly distinguishes the pH effect as being the base for the GACA. An attempt was made to assess the adsorption mechanism using the pseudo-first-order (PFO), the pseudo-second-order (PSO), and the intraparticle diffusion models. The higher R2 for the PSO in the entire pH range indicated that chemisorption was predominant for phosphate adsorption, and the pH did not change the adsorption mechanism. A prolonged Bed Volume (BV) for the GACA demonstrated that the hydrogen ions on the surface of the GAC enhanced phosphate adsorption.

scholarly journals Removal of phosphate from aqueous solution by sewage sludge-based activated carbon loaded with pyrolusite

2017 ◽  
Vol 8 (2) ◽  
pp. 192-201 ◽  
Author(s):  
Sicong Yao ◽  
Meicheng Wang ◽  
Jilong Liu ◽  
Shuxiong Tang ◽  
Hengli Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Sewage Sludge ◽  
Activated Carbons ◽  
Removal Rate ◽  
Chemical Activation ◽  
Phosphate Removal ◽  
Bet Surface Area ◽  
Phosphate Adsorption ◽  
Order Kinetic

Abstract Activated carbons were prepared from sewage sludge by chemical activation with pyrolusite (PAC) to develop an efficient adsorbent for phosphate removal from aqueous solution. One percent (wt.) pyrolusite addition was proved to have an important effect on pore formation of the produced carbon. PAC showed 17.06% larger Brunauer–Emmett–Teller (BET) surface area than the sewage sludge-based activated carbon without modification (SAC). The adsorption results showed that the phosphate removal by PAC was 13% higher than SAC's. The adsorption experiments also showed that PAC had very good performance with high phosphate removal rate (ca. 90%) in a wide pH range (pH = 4–8), and could be stable after 30 min reaction. Adsorption isotherm and kinetics studies demonstrated that phosphate adsorption onto the modified adsorbent was well fitted by the Langmuir isotherm and could be described by the pseudo-second-order kinetic model. The modified sewage sludge-based activated carbons were effective and alternative adsorbents for the removal of phosphorus from aqueous solution due to their considerable adsorptive capacities and the low-cost renewable sources.

Phosphate Removal from Aqueous Solution Using Fly Ash Modified with Magnetic Fe-Zn Bimetal Oxide

2012 ◽  
Vol 621 ◽  
pp. 296-302
Author(s):  
Ke Xu ◽  
Tong Deng ◽  
Chun Guang Li ◽  
Jun Ling Niu
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Langmuir Isotherm ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Ph Range ◽  
Modified Fly Ash

In this work the adsorption of phosphate using the magnetic Fe-Zn bimetal oxide modified fly ash was studied. The experimental results showed that the effective pH range for the adsorption of phosphate was between 3.0 and 9.0. The removal percentage of phosphate reached maximum at pH 8.0. Kinetic study showed that the phosphate adsorption was well described by pseudo second order model. The removal efficiency of phosphate increased with the increase of adsorbent dosage and the decrease of the initial concentration. The adsorption of phosphate could be described well by Langmuir isotherm, the Langmuir constant Q0 was 24.15mg/g.

Preparation of Mg-Fe HTLCs and Study on the Adsorption Performance

2014 ◽  
Vol 675-677 ◽  
pp. 647-653
Author(s):  
Hong Bin Lv ◽  
Yao Li ◽  
Wan You Zhang ◽  
Li Juan Xi
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Order Kinetic ◽  
Sulfate Ions ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Ph Range ◽  
Synthesized Materials

Mg-Fe hydrotalcite-like compounds (Mg-Fe-HTLCs) were synthesized via hydrothermal method, and characterized by XRD and FT-IR. The roasted products were used to remove sulfate ions by the adsorptive ability from aqueous solution. The effects of adsorbent dosage, initial pH and temperature on the sulfate ions removal were fully investigated, and the adsorption kinetics and adsorption isotherms were also studied. Results showed that the synthesized materials with CO32- as the interlayer anions had fine crystallinity. The materials of Mg-Fe hydrotalcite-like compounds had a very good adsorption capacity for aqueous solution with the initial sulfate ions concentration was 500mg/L, pH range from 4 to 8 and temperature of 35°C. Moreover, the adsorption equilibrium was about 90 min under the optical condition. The experimental data showed a good compliance with the pseudo-second-order kinetic model, and the adsorption isotherm data met Langmuir models well. It was found that the maximal adsorption capacity reached 151.51mg/g.

Mechanisms of Phosphate Removal by Synthesized Calcite

2013 ◽  
Vol 743-744 ◽  
pp. 597-602 ◽  
Author(s):  
Nan Xu ◽  
Hong Wei Yin ◽  
Zhi Gang Chen ◽  
Ming Chen ◽  
Shou Qing Liu
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Total Concentration ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Range ◽  
Scanning Electron

Calcite was synthesized through different drying processes, and characterized by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). By bath experiments, the mechanisms of phosphate removal by synthesizing calcite were investigated. It showed that synthesis calcite had a strong capability to remove phosphate from solution. The adsorption of phosphate mainly depended on the total concentration of phosphate and pH in solution. Magnesium tended to the phosphate adsorption during pH range of 8-13.5; while it inhibited the adsorption at around pH 7. The experimental results suggested that the synthesized calcite with aged process could effectively remove the phosphate from an alkaline aqueous solution.

scholarly journals Removal of cobalt(II) from aqueous solution by local Saudi bentonite: Kinetic and equilibrium investigations

2016 ◽  
Vol 35 (1) ◽  
pp. 87 ◽  
Author(s):  
Omar K. Alduaij ◽  
Mohamed I. Attia ◽  
Lotfi Khezami ◽  
Kamal K. Taha
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Bentonite Clay ◽  
Order Kinetic ◽  
Cobalt Ions ◽  
Composition And Structure ◽  
Intra Particle Diffusion ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model

Natural bentonite clay from Saudi Arabia was used to remove cobalt from aqueous solution. The clay samples were first characterized for their chemical composition and structure. Batch sorption studies were then conducted to assess their capacity to remove cobalt. The effect of contact time, initial analyte concentration, bentonite dose and temperature on the adsorption was investigated. The results showed that equilibrium was attained in 60 minutes. The metal adsorption was fitted to a Langmuir isotherm model and the maximum monolayer adsorption capacity was found to be 19.85 mg g−1 at 333 K. The pseudo-second-order kinetic model provided the best correlation to the experimental data. The application of an intra-particle diffusion model revealed that the adsorption mechanism of the cobalt ions is a rather complex process and that diffusion is involved in the overall rate of the adsorption process, but it is not the only rate-controlling step. The activation energy, Ea, ranged between 4.33 and 9.14 kJ mol−1, indicating a physical adsorption process.

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