Adsorption Capacity of Cr(VI) by Modified Fly Ash from Aqueous Solution

2011 ◽  
Vol 393-395 ◽  
pp. 1089-1092
Author(s):  
Ru Liu ◽  
Xiao Xia Hang ◽  
Chun Ying Wang
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Ph Value ◽  
Exothermal Reaction ◽  
Initial Concentration ◽  
Isotherm Equation ◽  
Langmuir Isotherm Equation ◽  
Modified Fly Ash

Various parameters (time, initial concentration, pH value and temperature) are investigated. The results show that with increasing the temperature decreased the absorbance. The optimal condition is that the maximum adsorption is 0.47mg•g-1 at303K, pH 1. Adsorption process fits the Langmuir isotherm equation, the adsorption reaction is exothermal reaction.

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

2013 ◽  
Vol 438-439 ◽  
pp. 42-45 ◽  
Author(s):  
Ke Xu ◽  
Xu Luo ◽  
Chun Guang Li ◽  
Jun Ling Niu
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Efficiency ◽  
Langmuir Isotherm ◽  
Phosphate Removal ◽  
Experimental Results ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Ph Range ◽  
Modified Fly Ash

In this work the adsorption of phosphate using the Fe-Cu bimetal oxide modified fly ash was studied. The experimental results showed that phosphate could be effectively removed in the pH range between 4 and 10. The removal percentage of phosphate reached maximum at pH 6.0. The adsorption of phosphate by the modified fly ash was rapid, and the adsorption percentage of phosphate could reach 91.20% in 5 minutes. 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 26.03mg/g.

Adsorption of Lanthanum (III)-Iron (III)-Doped Waste Coal Fly Ash Composite Adsorbent for Reactive Dyes from Aqueous Solution

2014 ◽  
Vol 787 ◽  
pp. 76-81 ◽  
Author(s):  
Bei Gang Li ◽  
Chen Wang ◽  
Jing Mi ◽  
Lei Ding
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Ph Value ◽  
Coal Fly Ash ◽  
Reactive Dyes ◽  
Composite Adsorbent ◽  
Isotherm Equation ◽  
Langmuir Isotherm Equation ◽  
Different Temperatures ◽  
Waste Coal

A composite adsorbent La/Fe/FA for reactive turquoise blue KN-G (RTB KN-G) and reactive brilliant blue KN-R (RBB KN-R) removal from aqueous solution was prepared by loading lanthanum (III) and iron (III) onto waste coal fly ash (FA). The adsorption behavior of RTB KN-G and RBB KN-R on La/Fe/FA was investigated systematically. The results show that the initial dye concentration, contact time, pH value and temperature are all the important factors influencing the adsorption. The adsorption of La/Fe/FA for two reactive dyes at different temperatures were very fast and can establish sorption equilibrium at 30min, and agreed well with pseudo-second-order kinetics. The equilibrium adsorption data could be described by the Langmuir isotherm equation well, and obtained maximum adsorption capacities at 25°C were 56.28 mg/g for RTB KN-G and 116.82mg/g for RBB KN-R, respectively. The rise of temperature was not conducive to adsorption. The results show that the La/Fe/FA adsorbent displays high effective adsorption for reactive dyes and will have potential as a promising application in the field of water pollution control and recycling utilization of resources.

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.

scholarly journals Adsorption of Rhodamine-B from Aqueous Solution by Activated Carbon from Almond Shell

Proceedings ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 51 ◽  
Author(s):  
Nasim Abdolrahimi ◽  
Azadeh Tadjarodi
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Rhodamine B ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Ph Value ◽  
Test Results ◽  
Almond Shell ◽  
Initial Concentration ◽  
Removal Efficiencies

The activated carbon was prepared from an almond shell, which is chemically activated by H2SO4. In the present study, the adsorption of rhodamine-B from water by activated carbon has been investigated and compared. The effect of pH value, initial concentration of dissolved and amount of adsorbent on the adsorption of rhodamine-B by the mentioned adsorbents were investigated. Results showed that the adsorption process was highly dependent on pH. Maximum rhodamine-B removal was achieved when the final pH is 11. Maximum rhodamine-B removal efficiencies were obtained by an almond shell (70%). Adsorption test results revealed that rhodamine-B adsorption on the studied adsorbents could be better described by Langmuir isotherm.

Experimental Research on Mercury-Containing Wastewater by Fly Ash

2013 ◽  
Vol 456 ◽  
pp. 559-563 ◽  
Author(s):  
Yan Li ◽  
Ping Sun
Keyword(s):  
Fly Ash ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Removal Rate ◽  
Practical Application ◽  
Mercury Ions ◽  
Removal Capacity ◽  
Carbide Slag ◽  
Modified Fly Ash

To study the removal capacity of modified fly ash in wastewater containing mercury ions under different conditions, the carbide slag was added to fly ash, and the pyrogenic process was employed to modify the fly ash. The result indicated that the wastewater had a pH value of 11, the modified fly ash dosage was 2.0 g, the adsorption equilibrium time was 40 minutes, the reaction temperature was 30 °C, the removal rate could reach 97.1%, and the Freundlich-type adsorption isotherm can be used to simulate the adsorption process effectively. The modified fly ash can be used in the removal of mercury-containing wastewater, the overall result of the experiment is satisfactory, which indicates that the modified fly ash has potential value for practical application.

Lignin-Quaternary Adsorbent: Synthesis, Characterization and Application for 2, 4, 6-Trinitrotoluene (TNT) Adsorption

2009 ◽  
Vol 620-622 ◽  
pp. 117-120 ◽  
Author(s):  
Xiu Rong Zhuo ◽  
Xue Gang Luo ◽  
Xiao Yan Lin ◽  
Chang Gang Xu
Keyword(s):  
Aqueous Solution ◽  
Mechanical Strength ◽  
Ir Spectra ◽  
Quaternary Ammonium ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Initial Concentration ◽  
Ether Bond ◽  
Initial Ph ◽  
Adsorbent Dose

A lignin-quaternary adsorbent was made from lignin after phenolization and then amination. As-prepared adsorbent was characterized by SEM, IR and DMA. Effects of adsorbent dose, initial pH and concentration on 2, 4, 6-Trinitrotoluene (TNT) removals from aqueous solution by adsorption of this adsorbent were comprehensively investigated. IR spectra showed that the product comprises quaternary ammonium groups in the form of ether bond. The mechanical strength of the adsorbent is enhanced by combining of PVA. It was possible to remove 66% of TNT from aqueous solution with 0.1 g of the adsorbent under certain conditions (100 mg/L and 25 °C). The results indicated that the amount of TNT adsorbed onto the adsorbent increased with increasing initial concentration; however, it decreased with an increase in pH. The adsorption process was determined to be consistent with the Langmuir isotherm.

A Study of Modification of Fly Ash and its Adsorption Effect on Cu2+ of Wastewater

2011 ◽  
Vol 365 ◽  
pp. 62-66
Author(s):  
Juan Juan Song ◽  
Li Tu
Keyword(s):  
Fly Ash ◽  
Ph Value ◽  
Mixing Time ◽  
Road Engineering ◽  
Adsorption Effect ◽  
Construction Engineering ◽  
Initial Concentration ◽  
Comprehensive Utilization ◽  
Copper Solution ◽  
Modified Fly Ash

The comprehensive utilization of fly ash mainly concentrated is in construction engineering channels, road engineering, it used to deal with waste water is full of hope. As this, it can achieve the purpose of using the waste to conduct waste. Fly ash was modified by a microwave radiation. This method was simple and easy to operate . When the dosage of Modified fly ash is 4g, the pH value is 6.2, the mixing time is 50min, the initial concentration of copper solution is 1.85mg/L ,Adsorption rate of modified fly ash on Cu2+ reached 96%.

Adsorption for Au3+ by Persimmon Tannins Immobilized on Collagen Fiber

2013 ◽  
Vol 745-746 ◽  
pp. 39-45 ◽  
Author(s):  
Feng Lei Liu ◽  
Zhong Min Wang ◽  
Jian Cui ◽  
Zhi De Zhou ◽  
Gui Yin Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Collagen Fiber ◽  
Adsorption Process ◽  
Ph Value ◽  
Hydroxyl Groups ◽  
Adsorption Behaviour ◽  
Solution Ph ◽  
Initial Concentration ◽  
Ft Ir ◽  
Precious Metal Ions

A novel adsorbent which is effective to adsorb Au3+ was prepared using immobilized persimmon tannin (PT) on collagen fiber by glutaraldehyde crosslinking. The adsorption behaviour of this new adsorbent to Au3+ in aqueous solution was investigated. The effects of various factors such as initial solution pH, temperature, ionic strength and initial concentration of Au3+ on the influence of the adsorption process were studied. The equilibrium adsorption capacity reached 2347 mg/g at 323 K and pH value 2.0 when the initial concentration of Au3+ in aqueous solution was 500 mg/L. The immobilized PT was characterized by FT-IR, XRD and SEM. The results indicated that Au3+ changed to gold by oxidation adjacent phenol hydroxyl groups of persimmon tannin. Experiments also showed that adsorption isotherms of immobilized tannin for Au3+ could be described by Langmuir models. Immobilized PT adsorption provided a new way for the separation of the precious metal ions

scholarly journals Removal of Phenol from Aqueous Solution by Adsorption on to Coal Fly Ash

1996 ◽  
Vol 13 (6) ◽  
pp. 527-536 ◽  
Author(s):  
L.J. Alemany ◽  
M.C. Jiménez ◽  
M.A. Larrubia ◽  
F. Delgado ◽  
J.M. Blasco
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Removal Efficiency ◽  
Ph Value ◽  
Coal Fly Ash ◽  
Solid Wastes ◽  
Power Stations ◽  
Different Temperatures ◽  
Coal Power ◽  
Coal Power Stations

The present work examines the possible use of fly ash, a byproduct of coal power stations, as a means of removing phenol from water, or equivalently, of restricting its movement in solid wastes or soil. Equilibrium experiments were performed to evaluate the removal efficiency of fly ash. The adsorption experiments were undertaken using fly ash treated at three different pH levels and with three different temperatures. The results indicate that although phenol can be removed from water, this depends markedly on the temperature and pH value of the treatment solution employed.

The Effectiveness Adsorption of Au(III) and Cu(II) Ion by Mangosteen Rind (Garcinia mangostana L.) Using Point of Zero Charge Calculation

2020 ◽  
Vol 840 ◽  
pp. 10-15
Author(s):  
Dian Hana Saraswati ◽  
Mellia Harumi ◽  
Triyono Triyono ◽  
Sri Sudiono
Keyword(s):  
Adsorption Capacity ◽  
Ph Value ◽  
Point Of Zero Charge ◽  
Garcinia Mangostana ◽  
Isotherm Equation ◽  
Solid Adsorbent ◽  
Zero Charge ◽  
Before And After ◽  
Langmuir Isotherm Equation ◽  
Gold Metal

Adsorption of Au(III) and Cu(II) by mangosteen rind adsorbent had been carried out. Mangosteen rind has several functional groups including –OH phenolics, ‒C=C‒ aromatics, and ethers. Dried mangosteen rind which was obtained from maceration was used to determine Point of Zero Charge (PZC). The most effective pH adsorption was determined by mixing adsorbent with Au(III) or Cu(II) solutions with various pH. The adsorption capacity was affected by the interaction between adsorbent and adsorbate. The solid adsorbent before and after interaction was characterized by FTIR, XRD, and microphotography. The PZC pH value of adsorbent was 3.7 while the optimum pH for Au(III) and Cu(II) were at pH 2 and pH 5, respectively. The adsorption capacity (qmax) value was 333.33 mg/g by following the Langmuir isotherm equation. The crystalline structure of adsorbent was analyzed using XRD and gave 4 peaks characteristics of gold metal on 2ϴ = 38º, 44º, 64º, and 77º after adsorption which indicated the reduction of Au(III) ions into Au(0).

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